#!/usr/bin/perl

# $Id: imapsync,v 1.870 2018/04/08 17:25:54 gilles Exp gilles $
# structure
# pod documentation
# use pragmas
# main program
# global variables initialisation
# get_options(  ) ;
# default values
# folder loop
# subroutines
# sub usage {

# pod documentation

=pod

=head1 NAME

imapsync - Email IMAP tool for syncing, copying and migrating 
email mailboxes between two imap servers, one way, 
and without duplicates.

=head1 VERSION

This documentation refers to Imapsync $Revision: 1.870 $

=head1 USAGE

 To synchronize the source imap account
   "test1" on server "test1.lamiral.info" with password "secret1"
 to the destination imap account
   "test2" on server "test2.lamiral.info" with password "secret2"
 do:

  imapsync \
   --host1 test1.lamiral.info --user1 test1 --password1 secret1 \
   --host2 test2.lamiral.info --user2 test2 --password2 secret2

=head1 DESCRIPTION

We sometimes need to transfer mailboxes from one imap server to
another.

Imapsync command is a tool allowing incremental and
recursive imap transfers from one mailbox to another.

By default all folders are transferred, recursively, meaning 
the whole folder hierarchy is taken, all messages in them, 
and all messages flags (\Seen \Answered \Flagged etc.) 
are synced too.

Imapsync reduces the amount
of data transferred by not transferring a given message
if it resides already on both sides. Same specific headers
and the transfer is done only once (by default it's
"Message-Id:" and "Received:" lines but it can be changed with
--useheader option).

All flags are preserved, unread will stay unread, read will stay read,
deleted will stay deleted. 

You can stop the transfer at any
time and restart it later, imapsync works well with bad
connections and interruptions.

You can decide to delete the messages from the source mailbox
after a successful transfer, it can be a good feature when migrating
live mailboxes since messages will be only on one side.
In that case, use the --delete1 option. Option --delete1 implies
also option --expunge1 so all messages marked deleted on host1
will be really deleted.

A different scenario is synchronizing a mailbox B from another mailbox A
in case you just want to keep a "live" copy of A in B.
In that case --delete2 has to be used, it deletes messages in host2
folder B that are not in host1 folder A. If you also need to destroy
host2 folders that are not in host1 then use --delete2folders (see also
--delete2foldersonly and --delete2foldersbutnot).

Imapsync is not adequate for maintaining two active imap accounts
in synchronization when the user plays independently on both sides.
Use offlineimap (written by John Goerzen) or mbsync (written by
Michael R. Elkins) for a 2 ways synchronization.


=head1 OPTIONS

 usage: imapsync [options]

Mandatory options are the six values, three on each sides,
needed to log in into the IMAP servers, ie, 
a host, a username, and a password, two times.

Conventions used:

 str means string
 int means integer
 reg means regular expression
 cmd means command

 --dry               : Makes imapsync doing nothing for real, just print what 
                       would be done without --dry.

=head2 OPTIONS/credentials


 --host1        str  : Source or "from" imap server. Mandatory.
 --port1        int  : Port to connect on host1. Default is 143, 993 if --ssl1
 --user1        str  : User to login on host1. Mandatory.
 --password1    str  : Password for the user1.
 --host2        str  : "destination" imap server. Mandatory.
 --port2        int  : Port to connect on host2. Default is 143, 993 if --ssl2
 --user2        str  : User to login on host2. Mandatory.
 --password2    str  : Password for the user2.

 --showpasswords     : Shows passwords on output instead of "MASKED".
                       Useful to restart a complete run by just reading the log,
                       or to debug passwords. It's not a secure practice.

 --passfile1    str  : Password file for the user1. It must contain the
                       password on the first line. This option avoids to show
                       the password on the command line like --password1 does.
 --passfile2    str  : Password file for the user2. Contains the password.

=head2 OPTIONS/encryption

 --nossl1            : Do not use a SSL connection on host1.
 --ssl1              : Use a SSL connection on host1. On by default if possible.
 --nossl2            : Do not use a SSL connection on host2.
 --ssl2              : Use a SSL connection on host2. On by default if possible.
 --notls1            : Do not use a TLS connection on host1.
 --tls1              : Use a TLS connection on host1. On by default if possible.
 --notls2            : Do not use a TLS connection on host2.
 --tls2              : Use a TLS connection on host2. On by default if possible.
 --debugssl     int  : SSL debug mode from 0 to 4.
 --sslargs1     str  : Pass any ssl parameter for host1 ssl or tls connection. Example:
                       --sslargs1 SSL_verify_mode=1 --sslargs1 SSL_version=SSLv3
                       See all possibilities in the new() method of IO::Socket::SSL
                       http://search.cpan.org/perldoc?IO::Socket::SSL#Description_Of_Methods
 --sslargs2     str  : Pass any ssl parameter for host2 ssl or tls connection.
                       See --sslargs1

 --timeout1     int  : Connection timeout in seconds for host1.
                       Default is 120 and 0 means no timeout at all.
 --timeout2     int  : Connection timeout in seconds for host2.
                       Default is 120 and 0 means no timeout at all.


=head2 OPTIONS/authentication

 --authmech1    str  : Auth mechanism to use with host1:
                       PLAIN, LOGIN, CRAM-MD5 etc. Use UPPERCASE.
 --authmech2    str  : Auth mechanism to use with host2. See --authmech1

 --authuser1    str  : User to auth with on host1 (admin user).
                       Avoid using --authmech1 SOMETHING with --authuser1.
 --authuser2    str  : User to auth with on host2 (admin user).
 --proxyauth1        : Use proxyauth on host1. Requires --authuser1.
                       Required by Sun/iPlanet/Netscape IMAP servers to
                       be able to use an administrative user.
 --proxyauth2        : Use proxyauth on host2. Requires --authuser2.

 --authmd51          : Use MD5 authentication for host1.
 --authmd52          : Use MD5 authentication for host2.
 --domain1      str  : Domain on host1 (NTLM authentication).
 --domain2      str  : Domain on host2 (NTLM authentication).


=head2 OPTIONS/folders


 --folder       str  : Sync this folder.
 --folder       str  : and this one, etc.
 --folderrec    str  : Sync this folder recursively.
 --folderrec    str  : and this one, etc.

 --folderfirst  str  : Sync this folder first. --folderfirst "Work"
 --folderfirst  str  : then this one, etc.
 --folderlast   str  : Sync this folder last. --folderlast "[Gmail]/All Mail"
 --folderlast   str  : then this one, etc.

 --nomixfolders      : Do not merge folders when host1 is case-sensitive
                       while host2 is not (like Exchange). Only the first
                       similar folder is synced (ex: Sent SENT sent -> Sent).

 --skipemptyfolders  : Empty host1 folders are not created on host2.

 --include      reg  : Sync folders matching this regular expression
 --include      reg  : or this one, etc.
                       If both --include --exclude options are used, then
                       include is done before.
 --exclude      reg  : Skips folders matching this regular expression
                       Several folders to avoid:
                        --exclude 'fold1|fold2|f3' skips fold1, fold2 and f3.
 --exclude      reg  : or this one, etc.

 --automap           : guesses folders mapping, for folders like
                       "Sent", "Junk", "Drafts", "All", "Archive", "Flagged".

 --f1f2    str1=str2 : Force folder str1 to be synced to str2,
                       --f1f2 overrides --automap and --regextrans2.

 --subfolder2   str  : Move whole host1 folders hierarchy under this
                       host2 folder  str    .
                       It does it by adding two --regextrans2 options before
                       all others. Add --debug to see what's really going on.

 --subscribed        : Transfers subscribed folders.
 --subscribe         : Subscribe to the folders transferred on the
                       host2 that are subscribed on host1. On by default.
 --subscribeall      : Subscribe to the folders transferred on the
                       host2 even if they are not subscribed on host1.

 --prefix1      str  : Remove prefix str to all destination folders,
                       usually INBOX. or INBOX/ or an empty string "".
                       imapsync guesses the prefix if host1 imap server
                       does not have NAMESPACE capability. This option
                       should not be used, most of the time.
 --prefix2      str  : Add prefix to all host2 folders. See --prefix1
 --sep1         str  : Host1 separator in case NAMESPACE is not supported.
 --sep2         str  : Host2 separator in case NAMESPACE is not supported.

 --regextrans2  reg  : Apply the whole regex to each destination folders.
 --regextrans2  reg  : and this one. etc.
                       When you play with the --regextrans2 option, first
                       add also the safe options --dry --justfolders
                       Then, when happy, remove --dry, remove --justfolders.
                       Have in mind that --regextrans2 is applied after prefix
                       and separator inversion. For examples see
                       http://imapsync.lamiral.info/FAQ.d/FAQ.Folders_Mapping.txt

=head2 OPTIONS/folders sizes

 --nofoldersizes     : Do not calculate the size of each folder at the
                       beginning of the sync. Default is to calculate them.
 --nofoldersizesatend: Do not calculate the size of each folder at the 
                       end of the sync. Default is to calculate them.
 --justfoldersizes   : Exit after having printed the initial folder sizes.


=head2 OPTIONS/tmp


 --tmpdir       str  : Where to store temporary files and subdirectories.
                       Will be created if it doesn't exist.
                       Default is system specific, Unix is /tmp but
                       /tmp is often too small and deleted at reboot.
                       --tmpdir /var/tmp should be better.
 --pidfile      str  : The file where imapsync pid is written,
                       it can be dirname/filename.
                       Default name is imapsync.pid in tmpdir.
 --pidfilelocking    : Abort if pidfile already exists. Useful to avoid
                       concurrent transfers on the same mailbox.


=head2 OPTIONS/log

 --nolog             : Turn off logging on file
 --logfile      str  : Change the default log filename (can be dirname/filename).
 --logdir       str  : Change the default log directory. Default is LOG_imapsync/


=head2 OPTIONS/messages

 --skipmess     reg  : Skips messages matching the regex.
                       Example: 'm/[\x80-ff]/' # to avoid 8bits messages.
                       --skipmess is applied before --regexmess
 --skipmess     reg  : or this one, etc.

 --pipemess     cmd  : Apply this cmd command to each message content
                       before the copy.
 --pipemess     cmd  : and this one, etc.

 --disarmreadreceipts : Disarms read receipts (host2 Exchange issue)

 --regexmess    reg  : Apply the whole regex to each message before transfer.
                       Example: 's/\000/ /g' # to replace null by space.
 --regexmess    reg  : and this one, etc.


=head2 OPTIONS/flags

 --regexflag    reg  : Apply the whole regex to each flags list.
                       Example: 's/"Junk"//g' # to remove "Junk" flag.
 --regexflag    reg  : then this one, etc.

 --resyncflags       : Resync flags for already transfered messages.
                       On by default.
 --noresyncflags     : Do not resync flags for already transfered messages.
                       May be useful when a user has already started to play 
                       with its host2 account.

=head2 OPTIONS/deletions

 --delete1           : Deletes messages on host1 server after a successful
                       transfer. Option --delete1 has the following behavior:
                       it marks messages as deleted with the IMAP flag
                       \Deleted, then messages are really deleted with an
                       EXPUNGE IMAP command. If expunging after each message
                       slows down too much the sync then use
                       --noexpungeaftereach to speed up.
 --expunge1          : Expunge messages on host1 just before syncing a folder.
                       Expunge is done per folder.
                       Expunge aims is to really delete messages marked deleted.
                       An expunge is also done after each message copied
                       if option --delete1 is set.
 --noexpunge1        : Do not expunge messages on host1.
 --delete1emptyfolders : Deletes empty folders on host1, INBOX excepted.
                         Useful with --delete1 since what remains on host1
                         is only what failed to be synced.

 --delete2           : Delete messages in host2 that are not in
                       host1 server. Useful for backup or pre-sync.
 --delete2duplicates : Delete messages in host2 that are duplicates.
                       Works only without --useuid since duplicates are
                       detected with an header part of each message.

 --delete2folders    : Delete folders in host2 that are not in host1 server.
                       For safety, first try it like this (it is safe):
                       --delete2folders --dry --justfolders --nofoldersizes
 --delete2foldersonly   reg : Deleted only folders matching regex.
                              Example: --delete2foldersonly "/^Junk$|^INBOX.Junk$/"
 --delete2foldersbutnot reg : Do not delete folders matching regex.
                              Example: --delete2foldersbutnot "/Tasks$|Contacts$|Foo$/"

 --expunge2          : Expunge messages on host2 after messages transfer.
 --uidexpunge2       : uidexpunge messages on the host2 account
                       that are not on the host1 account, requires --delete2


=head2 OPTIONS/dates

 --syncinternaldates : Sets the internal dates on host2 same as host1.
                       Turned on by default. Internal date is the date
                       a message arrived on a host (mtime).
 --idatefromheader   : Sets the internal dates on host2 same as the
                       "Date:" headers.


=head2 OPTIONS/message selection

 --maxsize      int  : Skip messages larger  (or equal) than  int  bytes
 --minsize      int  : Skip messages smaller (or equal) than  int  bytes
 --maxage       int  : Skip messages older than  int  days.
                       final stats (skipped) don't count older messages
                       see also --minage
 --minage       int  : Skip messages newer than  int  days.
                       final stats (skipped) don't count newer messages
                       You can do (+ are the messages selected):
                       past|----maxage+++++++++++++++>now
                       past|+++++++++++++++minage---->now
                       past|----maxage+++++minage---->now (intersection)
                       past|++++minage-----maxage++++>now (union)

 --search       str  : Selects only messages returned by this IMAP SEARCH
                       command. Applied on both sides.
 --search1      str  : Same as --search for selecting host1 messages only.
 --search2      str  : Same as --search for selecting host2 messages only.
                       --search CRIT equals --search1 CRIT --search2 CRIT

 --maxlinelength int : skip messages with a line length longer than  int  bytes.
                       RFC 2822 says it must be no more than 1000 bytes.


 --useheader    str  : Use this header to compare messages on both sides.
                       Ex: Message-ID or Subject or Date.
 --useheader    str    and this one, etc.

 --usecache          : Use cache to speed up the sync.
 --nousecache        : Do not use cache. Caveat: --useuid --nousecache creates
                       duplicates on multiple runs.
 --useuid            : Use uid instead of header as a criterium to recognize
                       messages. Option --usecache is then implied unless
                       --nousecache is used.


=head2 OPTIONS/miscelaneous

 --syncacls          : Synchronizes acls (Access Control Lists).
 --nosyncacls        : Does not synchronize acls. This is the default.
                       Acls in IMAP are not standardized, be careful.



=head2 OPTIONS/debugging

 --debug             : Debug mode.
 --debugfolders      : Debug mode for the folders part only.
 --debugcontent      : Debug content of the messages transferred. Huge output.
 --debugflags        : Debug mode for flags.
 --debugimap1        : IMAP debug mode for host1. Very verbose.
 --debugimap2        : IMAP debug mode for host2. Very verbose.
 --debugimap         : IMAP debug mode for host1 and host2.
 --debugmemory       : Debug mode showing memory consumption after each copy.

 --errorsmax     int : Exit when int number of errors is reached. Default is 50.

 --tests             : Run local non-regression tests. Exit code 0 means all ok.
 --testslive         : Run a live test with test1.lamiral.info imap server.
                       Useful to check the basics. Needs internet connexion.
 --testslive6        : Run a live test with ks2ipv6.lamiral.info imap server.
                       Useful to check the ipv6 connectivity. Needs internet.


=head2 OPTIONS/specific 

  --gmail1           : sets --host1 to Gmail and options from FAQ.Gmail.txt
  --gmail2           : sets --host2 to Gmail and options from FAQ.Gmail.txt
  
  --office1          : sets --host1 to Office365 options from FAQ.Exchange.txt
  --office2          : sets --host2 to Office365 options from FAQ.Exchange.txt

  --exchange1        : sets options from FAQ.Exchange.txt, account1 part
  --exchange2        : sets options from FAQ.Exchange.txt, account2 part
  
  --domino1          : sets options from FAQ.Domino.txt, account1 part
  --domino2          : sets options from FAQ.Domino.txt, account2 part
  
  
  

=head2 OPTIONS/behavior 

 --maxmessagespersecond int : limits the number of messages transferred per second.
 
 --maxbytespersecond int : limits the average transfer rate per second.
 --maxbytesafter     int : starts --maxbytespersecond limitation only after 
                           --maxbytesafter amount of data transferred.
 
 --maxsleep      int : do not sleep more than int seconds.
                       On by default, 2 seconds max, like --maxsleep 2

 --abort             : terminates a previous call still running. 
                       It uses the pidfile to know what processus to abort.

 --exitwhenover int  : Stop syncing when total bytes transferred reached.

 --version           : Print only software version.
 --noreleasecheck    : Do not check for new imapsync release (a http request).
 --releasecheck      : Check for new imapsync release (a http request).
 --noid              : Do not send/receive ID command to imap servers.
 --justconnect       : Just connect to both servers and print useful
                       information. Need only --host1 and --host2 options.
 --justlogin         : Just login to both host1 and host2 with users
                       credentials, then exit.
 --justfolders       : Do only things about folders (ignore messages).

 --help              : print this help.

 Example: to synchronize imap account "test1" on "test1.lamiral.info"
                     to  imap account "test2" on "test2.lamiral.info"
                     with test1 password "secret1"
                     and  test2 password "secret2"

 imapsync \
    --host1 test1.lamiral.info --user1 test1 --password1 secret1 \
    --host2 test2.lamiral.info --user2 test2 --password2 secret2


=cut

# comment

=pod



=head1 SECURITY

You can use --passfile1  instead of --password1 to give the
password since it is safer. With --password1 option any user
on your host can see the password by using the 'ps auxwwww'
command. Using a variable (like $PASSWORD1) is also
dangerous because of the 'ps auxwwwwe' command. So, saving
the password in a well protected file (600 or rw-------) is
the best solution.

Imapsync activates ssl or tls encryption by default, if possible. 
What details are under this "if possible"? 
Imapsync activates ssl if the well known port imaps port (993) is open 
on the imap servers. If the imaps port is closed then it open a 
normal (clear) connection on port 143 but it looks for TLS support 
in the CAPABILITY list of the servers. If TLS is supported 
then imapsync goes to encryption.

If the automatic ssl/tls detection fails then imapsync will
not protect against sniffing activities on the
network, especially for passwords.

See also the document FAQ.Security.txt in the FAQ.d/ directory
or at https://imapsync.lamiral.info/FAQ.d/FAQ.Security.txt

=head1 EXIT STATUS

Imapsync will exit with a 0 status (return code) if everything went good.
Otherwise, it exits with a non-zero status.



=head1 LICENSE AND COPYRIGHT

Imapsync is free, open, public but not always gratis software
cover by the NOLIMIT Public License.
See the LICENSE file included in the distribution or just read this
simple sentence as it IS the licence text:

 "No limits to do anything with this work and this license."

In case it is not long enough, I repeat:

 "No limits to do anything with this work and this license."

https://imapsync.lamiral.info/LICENSE

=head1 AUTHOR

Gilles LAMIRAL <gilles@lamiral.info>

Feedback good or bad is very often welcome.

Gilles LAMIRAL earns his living by writing, installing,
configuring and teaching free, open and often gratis
software. Imapsync used to be "always gratis" but now it is
only "often gratis" because imapsync is sold by its author, 
a good way to maintain and support free open public
software over decades.

=head1 BUGS AND LIMITATIONS

See https://imapsync.lamiral.info/FAQ.d/FAQ.Reporting_Bugs.txt

=head1 IMAP SERVERS supported

See https://imapsync.lamiral.info/S/imapservers.shtml

=head1 HUGE MIGRATION

Pay special attention to options
--subscribed
--subscribe
--delete1
--delete2
--delete2folders
--maxage
--minage
--maxsize
--useuid
--usecache

If you have many mailboxes to migrate think about a little
shell program. Write a file called file.txt (for example)
containing users and passwords.
The separator used in this example is ';'

The file.txt file contains:

user001_1;password001_1;user001_2;password001_2
user002_1;password002_1;user002_2;password002_2
user003_1;password003_1;user003_2;password003_2
user004_1;password004_1;user004_2;password004_2
user005_1;password005_1;user005_2;password005_2
...

On Unix the shell program can be:

 { while IFS=';' read  u1 p1 u2 p2; do
        imapsync --host1 imap.side1.org --user1 "$u1" --password1 "$p1" \
                 --host2 imap.side2.org --user2 "$u2" --password2 "$p2" ...
 done ; } < file.txt

On Windows the batch program can be:

  FOR /F "tokens=1,2,3,4 delims=; eol=#" %%G IN (file.txt) DO imapsync ^
  --host1 imap.side1.org --user1 %%G --password1 %%H ^
  --host2 imap.side2.org --user2 %%I --password2 %%J ...

The ... have to be replaced by nothing or any imapsync option.
Welcome in shell or batch programming !

You will find already written scripts at
http://imapsync.lamiral.info/examples/

=head1 INSTALL

 Imapsync works under any Unix with perl.
 Imapsync works under Windows (2000, XP, Vista, Seven)
 as a standalone binary software called imapsync.exe
 Imapsync works under OS X as a standalone binary
 software called imapsync_bin_Darwin.

 Purchase latest imapsync at
 http://imapsync.lamiral.info/

 You'll receive a link to a compressed tarball called imapsync-x.xx.tgz
 where x.xx is the version number. Untar the tarball where
 you want (on Unix):

 tar xzvf  imapsync-x.xx.tgz

 Go into the directory imapsync-x.xx and read the INSTALL file.
 As mentioned at http://imapsync.lamiral.info/#install
 the INSTALL file can also be found at
 http://imapsync.lamiral.info/INSTALL
 It is now split in several files for each system
 http://imapsync.lamiral.info/INSTALL.d/

=head1 CONFIGURATION

There is no specific configuration file for imapsync,
everything is specified by the command line parameters
and the default behavior.


=head1 HACKING

Feel free to hack imapsync as the NOLIMIT license permits it.


=head1 SIMILAR SOFTWARES

  imap_tools    : http://www.athensfbc.com/imap_tools
  offlineimap   : https://github.com/nicolas33/offlineimap
  mbsync        : http://isync.sourceforge.net/
  mailsync      : http://mailsync.sourceforge.net/
  mailutil      : http://www.washington.edu/imap/
                  part of the UW IMAP tookit.
  imaprepl      : http://www.bl0rg.net/software/
                  http://freecode.com/projects/imap-repl/
  imapcopy      : http://home.arcor.de/armin.diehl/imapcopy/imapcopy.html
  migrationtool : http://sourceforge.net/projects/migrationtool/
  imapmigrate   : http://sourceforge.net/projects/cyrus-utils/
  wonko_imapsync: http://wonko.com/article/554
                  see also file W/tools/wonko_ruby_imapsync
  exchange-away : http://exchange-away.sourceforge.net/
  pop2imap      : http://www.linux-france.org/prj/pop2imap/


Feedback (good or bad) will often be welcome.

=head1 HISTORY

I wrote imapsync because an enterprise (basystemes) paid me to install
a new imap server without losing huge old mailboxes located in a far
away remote imap server, accessible by a low-bandwidth link. The tool
imapcp (written in python) could not help me because I had to verify
every mailbox was well transferred, and then delete it after a good
transfer. Imapsync started its life as a patch of the copy_folder.pl 
script. The script copy_folder.pl comes from the Mail-IMAPClient-2.1.3 perl
module tarball source (more precisely in the examples/ directory of the 
Mail-IMAPClient tarball).


=cut

# use pragmas

use strict ;
use warnings ;
use Carp ;
use Data::Dumper ;
use Digest::HMAC_SHA1 qw( hmac_sha1 hmac_sha1_hex ) ;
use Digest::MD5 qw( md5 md5_hex md5_base64 ) ;
use English qw( -no_match_vars ) ;
use Errno qw(EAGAIN EPIPE ECONNRESET) ;
use Fcntl ;
use File::Basename ;
use File::Copy::Recursive ;
use File::Glob qw( :glob ) ;
use File::Path qw( mkpath rmtree ) ;
use File::Spec ;
use File::stat ;
use Getopt::Long () ;
use IO::File ;
use IO::Socket qw( :crlf SOL_SOCKET SO_KEEPALIVE ) ;
use IO::Socket::INET6 ;
use IO::Socket::SSL ;
use IO::Tee ;
use IPC::Open3 'open3' ;
use Mail::IMAPClient 3.30 ;
use MIME::Base64 ;
use Pod::Usage qw(pod2usage) ;
use POSIX qw(uname SIGALRM) ;
use Sys::Hostname ;
use Term::ReadKey ;
use Test::More ;
use Time::HiRes qw( time sleep ) ;
use Time::Local ;
use Unicode::String ;
use Cwd ;
use Readonly ;
use Sys::MemInfo ;
use Regexp::Common ;

local $OUTPUT_AUTOFLUSH = 1 ;

# constants

# Let us do like sysexits.h
# /usr/include/sysexits.h

Readonly my $EX_OK    => 0 ;     #/* successful termination */
Readonly my $EX_USAGE => 64 ;    #/* command line usage error */

#Readonly my $EX_DATAERR     => 65 ; #/* data format error */
Readonly my $EX_NOINPUT => 66 ;    #/* cannot open input */

#Readonly my $EX_NOUSER      => 67 ; #/* addressee unknown */
#Readonly my $EX_NOHOST      => 68 ; #/* host name unknown */
Readonly my $EX_UNAVAILABLE => 69 ;    #/* service unavailable */
Readonly my $EX_SOFTWARE    => 70 ;    #/* internal software error */

#Readonly my $EX_OSERR       => 71 ; #/* system error (e.g., can't fork) */
#Readonly my $EX_OSFILE      => 72 ; #/* critical OS file missing */
#Readonly my $EX_CANTCREAT   => 73 ; #/* can't create (user) output file */
#Readonly my $EX_IOERR       => 74 ; #/* input/output error */
#Readonly my $EX_TEMPFAIL    => 75 ; #/* temp failure; user is invited to retry */
#Readonly my $EX_PROTOCOL    => 76 ; #/* remote error in protocol */
#Readonly my $EX_NOPERM      => 77 ; #/* permission denied */
#Readonly my $EX_CONFIG      => 78 ; #/* configuration error */

# Mine
Readonly my $EXIT_BY_SIGNAL      => 6 ;
Readonly my $EXIT_PID_FILE_ERROR => 8 ;

Readonly my $EXIT_WITH_ERRORS     => 111 ;
Readonly my $EXIT_WITH_ERRORS_MAX => 112 ;
Readonly my $EXIT_UNKNOWN         => 126 ;

Readonly my $EXIT_TESTS_FAILED => 254 ;    # Like Test::More API

Readonly my $ERRORS_MAX     => 50 ;        # exit after 50 errors.
Readonly my $ERRORS_MAX_CGI => 20 ;        # exit after 20 errors in CGI context.

Readonly my $INTERVAL_TO_EXIT => 2 ;       # interval max to exit instead of reconnect

Readonly my $SPLIT        => 100 ;         # By default, 100 at a time, not more.
Readonly my $SPLIT_FACTOR => 10 ;          # init_imap() calls Maxcommandlength( $SPLIT_FACTOR * $split )
                                           # which means default Maxcommandlength is 10*100 = 1000 characters ;

Readonly my $IMAP_PORT     => 143 ;        # Well know port for IMAP
Readonly my $IMAP_SSL_PORT => 993 ;        # Well know port for IMAP over SSL

Readonly my $LAST      => -1 ;
Readonly my $MINUS_ONE => -1 ;
Readonly my $MINUS_TWO => -2 ;

Readonly my $RELEASE_NUMBER_EXAMPLE_1 => '1.351' ;
Readonly my $RELEASE_NUMBER_EXAMPLE_2 => 42.4242 ;

Readonly my $TCP_PING_TIMEOUT                      => 5 ;
Readonly my $DEFAULT_TIMEOUT                       => 120 ;
Readonly my $DEFAULT_NB_RECONNECT_PER_IMAP_COMMAND => 3 ;
Readonly my $DEFAULT_UIDNEXT                       => 999_999 ;
Readonly my $DEFAULT_BUFFER_SIZE                   => 4096 ;

Readonly my $MAX_SLEEP => 2 ;    # 2 seconds max for limiting too long sleeps from --maxbytespersecond and --maxmessagespersecond

Readonly my $DEFAULT_EXPIRATION_TIME_OAUTH2_PK12 => 3600 ;

Readonly my $PERMISSION_FILTER => 7777 ;

Readonly my $KIBI => 1024 ;

Readonly my $NUMBER_10  => 10 ;
Readonly my $NUMBER_42  => 42 ;
Readonly my $NUMBER_100 => 100 ;
Readonly my $NUMBER_200 => 200 ;
Readonly my $NUMBER_300 => 300 ;

Readonly my $NUMBER_20_000 => 20_000 ;

Readonly my $QUOTA_PERCENT_LIMIT => 90 ;

Readonly my $NUMBER_104_857_600 => 104_857_600 ;

Readonly my $SIZE_MAX_STR => 64 ;

Readonly my $NB_SECONDS_IN_A_DAY => 86_400 ;

Readonly my $STD_CHAR_PER_LINE => 80 ;

Readonly my $TRUE  => 1 ;
Readonly my $FALSE => 0 ;

Readonly my $LAST_RESSORT_SEPARATOR => q{/} ;

Readonly my $CGI_TMPDIR_TOP => '/var/tmp/imapsync_cgi' ;
Readonly my $CGI_HASHFILE   => '/var/tmp/imapsync_hash' ;
Readonly my $UMASK_PARANO   => '0077' ;

Readonly my $STR_use_releasecheck => q{Check if a new imapsync release is available by adding --releasecheck} ;

# global variables
# Currently working to finish with only $sync
# Not finished yet...

my (
        $sync,
        $debug,     $debugimap, $debugimap1,         $debugimap2, $debugcontent, $debugflags,
        $debuglist, $debugdev,  $debugmaxlinelength, $debugcgi,
        $domain1,   $domain2,
        $passfile1, $passfile2,
        @include,     @exclude, @folderrec,
        @folderfirst, @folderlast,
        $prefix1,     $prefix2,
        $subfolder2,
        @regextrans2, @regexmess,   @regexflag, @skipmess, @pipemess, $pipemesscheck,
        $flagscase,   $filterflags, $syncflagsaftercopy,
        $sep1,        $sep2,
        $syncinternaldates,
        $idatefromheader,
        $syncacls,
        $fastio1, $fastio2,
        $maxsize, $minsize, $maxage, $minage,
        $exitwhenover,
        $search,     $search1, $search2,
        $skipheader, @useheader,
        $skipsize, $allowsizemismatch, $foldersizes, $foldersizesatend, $buffersize,
        $delete1,  $delete2,           $delete2duplicates,
        $expunge1, $expunge2,          $uidexpunge2,
        $justfoldersizes,
        $authmd5,    $authmd51,  $authmd52,
        $subscribed, $subscribe, $subscribeall,
        $help,
        $justfolders, $justbanner,
        $fast,
        $total_bytes_skipped,
        $total_bytes_error,
        $nb_msg_skipped,
        $nb_msg_skipped_dry_mode,
        $h1_nb_msg_duplicate,
        $h2_nb_msg_duplicate,
        $h1_nb_msg_noheader,
        $h2_nb_msg_noheader,
        $h1_total_bytes_duplicate,
        $h2_total_bytes_duplicate,
        $h1_nb_msg_deleted,
        $h2_nb_msg_deleted,

        $h1_bytes_processed,
        $h1_nb_msg_processed,
        $h1_nb_msg_start, $h1_bytes_start,
        $h2_nb_msg_start, $h2_bytes_start,
        $h1_nb_msg_end,   $h1_bytes_end,
        $h2_nb_msg_end,   $h2_bytes_end,

        $timeout,
        $timestart_int,
        $timebefore,
        $uid1,            $uid2,
        $authuser1,       $authuser2,
        $proxyauth1,      $proxyauth2,
        $authmech1,       $authmech2,
        $split1,          $split2,
        $reconnectretry1, $reconnectretry2,
        $tmpdir,
        $max_msg_size_in_bytes,
        $modulesversion,
        $delete2folders, $delete2foldersonly, $delete2foldersbutnot,
        $usecache,       $debugcache,         $cacheaftercopy,
        $wholeheaderifneeded, %h1_msgs_copy_by_uid, $useuid, $h2_uidguess,
        %h1,                  %h2,
        $checkmessageexists,
        $expungeaftereach,
        $fixslash2,
        $messageidnodomain,
        $fixInboxINBOX,
        $maxlinelength, $maxlinelengthcmd,
        $minmaxlinelength,
        $uidnext_default,
        $fixcolonbug,
        $create_folder_old,
        $skipcrossduplicates, $debugcrossduplicates,
        $disarmreadreceipts,
        $mixfolders, $skipemptyfolders,
        $fetch_hash_set,
) ;

# main program
# global variables initialization

# Currently removing all global variables except $sync
# passing each of them under $sync->{variable_name}

$sync->{timestart} = time ;    # Is a float because of use Time::HiRres

$sync->{rcs} = q{$Id: imapsync,v 1.870 2018/04/08 17:25:54 gilles Exp gilles $} ;

$sync->{memory_consumption_at_start} = memory_consumption() || 0 ;

my @loadavg = loadavg() ;

$sync->{cpu_number} = cpu_number() ;
$sync->{loaddelay}  = load_and_delay( $sync->{cpu_number}, @loadavg ) ;
$sync->{loadavg}    = join( q{ }, $loadavg[0] ) . " on $sync->{cpu_number} cores and " . ram_memory_info() ;

$sync->{total_bytes_transferred} = 0 ;
$total_bytes_skipped             = 0 ;
$total_bytes_error               = 0 ;
$sync->{nb_msg_transferred}      = 0 ;
$nb_msg_skipped           = $nb_msg_skipped_dry_mode  = 0 ;
$h1_nb_msg_deleted        = $h2_nb_msg_deleted        = 0 ;
$h1_nb_msg_duplicate      = $h2_nb_msg_duplicate      = 0 ;
$h1_nb_msg_noheader       = $h2_nb_msg_noheader       = 0 ;
$h1_total_bytes_duplicate = $h2_total_bytes_duplicate = 0 ;

$h1_nb_msg_start     = $h1_bytes_start     = 0 ;
$h2_nb_msg_start     = $h2_bytes_start     = 0 ;
$h1_nb_msg_processed = $h1_bytes_processed = 0 ;

#$h1_nb_msg_end = $h1_bytes_end = 0 ;
#$h2_nb_msg_end = $h2_bytes_end = 0 ;

$sync->{nb_errors} = 0 ;
$max_msg_size_in_bytes = 0 ;

my %month_abrev = (
        Jan => '00',
        Feb => '01',
        Mar => '02',
        Apr => '03',
        May => '04',
        Jun => '05',
        Jul => '06',
        Aug => '07',
        Sep => '08',
        Oct => '09',
        Nov => '10',
        Dec => '11',
) ;

my $cgidir ;

# Just create a CGI object if under cgi context only.
# Needed for the get_options() call
cgibegin( $sync ) ;

# In cgi context, printing must start by the header so we delay other prints by using output() storage
my $options_good = get_options( $sync, @ARGV ) ;
docker_context( $sync ) ;
cgibuildheader( $sync ) ;
myprint( output( $sync ) ) ;
output_reset_with( $sync ) ;

# Can break here if load is too heavy
cgiload( $sync ) ;

# don't go on if options are not all known.
if ( !defined $options_good ) { exit $EX_USAGE ; }

# If you want releasecheck not to be done by default (like the github maintainer),
# then just uncomment the first "$sync->{releasecheck} =" line, the line ending with "0 ;",
# the second line (ending with "1 ;") can then stay active or be commented,
# the result will be the same: no releasecheck by default (because 0 is then the defined value).

#$sync->{releasecheck} = defined  $sync->{releasecheck}  ? $sync->{releasecheck} : 0 ;
$sync->{releasecheck} = defined $sync->{releasecheck} ? $sync->{releasecheck} : 1 ;

# just the version
myprint( imapsync_version( $sync ), "\n" ) and exit 0 if ( $sync->{version} ) ;

$sync->{debugenv} and printenv( $sync ) ;    # if option --debugenv
load_modules() ;

# after_get_options call usage and exit if --help or options were not well got
after_get_options( $options_good ) ;

# Under CGI environment, fix caveat emptor potential issues
cgisetcontext( $sync ) ;

easyany( $sync ) ;

$tmpdir ||= File::Spec->tmpdir() ;

# Unit tests
testsexit( $sync ) ;

# init live varaiables
testslive( $sync )  if ( $sync->{testslive} ) ;
testslive6( $sync ) if ( $sync->{testslive6} ) ;

#
$sync->{pidfile}        = defined $sync->{pidfile}        ? $sync->{pidfile}        : $tmpdir . '/imapsync.pid' ;
$sync->{pidfilelocking} = defined $sync->{pidfilelocking} ? $sync->{pidfilelocking} : 0 ;

# old abort place

@{ $sync->{sigexit} } = ( defined( $sync->{sigexit} ) ) ? @{ $sync->{sigexit} } : ( 'QUIT', 'TERM' ) ;
@{ $sync->{sigreconnect} } = ( defined( $sync->{sigreconnect} ) ) ? @{ $sync->{sigreconnect} } : ( 'INT' ) ;

sig_install( $sync, \&catch_exit,      @{ $sync->{sigexit} } ) ;
sig_install( $sync, \&catch_reconnect, @{ $sync->{sigreconnect} } ) ;

# --sigignore can override sigexit and sigreconnect (for the same signals only)
sig_install( $sync, \&catch_ignore, @{ $sync->{sigignore} } ) ;

$sync->{log}        = defined $sync->{log}        ? $sync->{log}        : 1 ;
$sync->{errorsdump} = defined $sync->{errorsdump} ? $sync->{errorsdump} : 1 ;
$sync->{errorsmax}  = defined $sync->{errorsmax}  ? $sync->{errorsmax}  : $ERRORS_MAX ;

if ( $sync->{log} ) {
        setlogfile( $sync ) ;
        teelaunch( $sync ) ;
}

$timestart_int = int( $sync->{timestart} ) ;
$timebefore    = $sync->{timestart} ;

my $timestart_str = localtime( $sync->{timestart} ) ;
myprint( localhost_info( $sync ), "\n" ) ;
myprint( "Transfer started at $timestart_str\n" ) ;
myprint( "PID is $PROCESS_ID\n" ) ;
myprint( "Log file is $sync->{logfile} ( to change it, use --logfile path ; or use --nolog to turn off logging )\n" ) if ( $sync->{log} ) ;
myprint( "Load is " . ( join( q{ }, loadavg() ) || 'unknown' ), " on $sync->{cpu_number} cores\n" ) ;
myprintf( "Memory consumption so far: %.1f MiB\n", memory_consumption() / $KIBI / $KIBI ) ;
myprint( 'Current directory is ' . getcwd() . "\n" ) ;
myprint( 'Real user id is ' . getpwuid_any_os( $REAL_USER_ID ) . " (uid $REAL_USER_ID)\n" ) ;
myprint( 'Effective user id is ' . getpwuid_any_os( $EFFECTIVE_USER_ID ) . " (euid $EFFECTIVE_USER_ID)\n" ) ;

$modulesversion = defined $modulesversion ? $modulesversion : 1 ;

my $warn_release = ( $sync->{releasecheck} ) ? check_last_release() : $STR_use_releasecheck ;

$wholeheaderifneeded = defined $wholeheaderifneeded ? $wholeheaderifneeded : 1 ;

# Activate --usecache if --useuid is set and no --nousecache
$usecache       = 1 if ( $useuid   and ( !defined $usecache ) ) ;
$cacheaftercopy = 1 if ( $usecache and ( !defined $cacheaftercopy ) ) ;

$sync->{checkselectable}   = defined $sync->{checkselectable}   ? $sync->{checkselectable}   : 1 ;
$sync->{checkfoldersexist} = defined $sync->{checkfoldersexist} ? $sync->{checkfoldersexist} : 1 ;
$checkmessageexists        = defined $checkmessageexists        ? $checkmessageexists        : 0 ;
$expungeaftereach          = defined $expungeaftereach          ? $expungeaftereach          : 1 ;

# abletosearch is on by default
$sync->{abletosearch}  = defined $sync->{abletosearch}  ? $sync->{abletosearch}  : 1 ;
$sync->{abletosearch1} = defined $sync->{abletosearch1} ? $sync->{abletosearch1} : $sync->{abletosearch} ;
$sync->{abletosearch2} = defined $sync->{abletosearch2} ? $sync->{abletosearch2} : $sync->{abletosearch} ;
$checkmessageexists = 0 if ( not $sync->{abletosearch1} ) ;

$sync->{showpasswords} = defined $sync->{showpasswords} ? $sync->{showpasswords} : 0 ;
$fixslash2             = defined $fixslash2             ? $fixslash2             : 1 ;
$fixInboxINBOX         = defined $fixInboxINBOX         ? $fixInboxINBOX         : 1 ;
$create_folder_old     = defined $create_folder_old     ? $create_folder_old     : 0 ;
$mixfolders            = defined $mixfolders            ? $mixfolders            : 1 ;
$sync->{automap}       = defined $sync->{automap}       ? $sync->{automap}       : 0 ;

$delete2duplicates = 1 if ( $delete2 and ( !defined $delete2duplicates ) ) ;

$sync->{maxmessagespersecond} = defined $sync->{maxmessagespersecond} ? $sync->{maxmessagespersecond} : 0 ;
$sync->{maxbytespersecond}    = defined $sync->{maxbytespersecond}    ? $sync->{maxbytespersecond}    : 0 ;

$sync->{sslcheck} = defined $sync->{sslcheck} ? $sync->{sslcheck} : 1 ;

myprint( banner_imapsync( @ARGV ) ) ;

myprint( "Temp directory is $tmpdir  ( to change it use --tmpdir dirpath )\n" ) ;
myprint( output( $sync ) ) ;

do_valid_directory( $tmpdir ) || croak "Error creating tmpdir $tmpdir : $OS_ERROR" ;

remove_pidfile_not_running( $sync->{pidfile} ) ;

if ( !write_pidfile( $sync ) ) {
        exit $EXIT_PID_FILE_ERROR ;
}

# simulong is just a loop printing some lines for xx seconds with option "--simulong xx".
if ( $sync->{simulong} ) { simulong( $sync->{simulong} ) ; }

# New place to abort
if ( $sync->{abort} ) {
        abort( $sync ) ;
}

$fixcolonbug = defined $fixcolonbug ? $fixcolonbug : 1 ;

if ( $usecache and $fixcolonbug ) { tmpdir_fix_colon_bug() }

$modulesversion and myprint( "Modules version list:\n", modulesversion(), "( use --no-modulesversion to turn off printing this Perl modules list )\n" ) ;

check_lib_version()
  or croak "imapsync needs perl lib Mail::IMAPClient release 3.30 or superior.\n" ;

exit_clean( $sync, $EX_OK ) if ( $justbanner ) ;

# turn on RFC standard flags correction like \SEEN -> \Seen
$flagscase = defined $flagscase ? $flagscase : 1 ;

# Use PERMANENTFLAGS if available
$filterflags = defined $filterflags ? $filterflags : 1 ;

# sync flags just after an APPEND, some servers ignore the flags given in the APPEND
# like MailEnable IMAP server.
# Off by default since it takes time.
$syncflagsaftercopy = defined $syncflagsaftercopy ? $syncflagsaftercopy : 0 ;

# update flags on host2 for already transfered messages
$sync->{resyncflags} = defined $sync->{resyncflags} ? $sync->{resyncflags} : 1 ;
if ( $sync->{resyncflags} ) {
        myprint( "Info: will resync flags for already transfered messages. Use --noresyncflags to not resync flags.\n" ) ;
}
else {
        myprint( "Info: will not resync flags for already transfered messages. Use --resyncflags to resync flags.\n" ) ;
}

sslcheck( $sync ) ;

$split1 ||= $SPLIT ;
$split2 ||= $SPLIT ;

$sync->{host1} || missing_option( '--host1' ) ;
$sync->{port1} ||= ( $sync->{ssl1} ) ? $IMAP_SSL_PORT : $IMAP_PORT ;

$sync->{host2} || missing_option( '--host2' ) ;
$sync->{port2} ||= ( $sync->{ssl2} ) ? $IMAP_SSL_PORT : $IMAP_PORT ;

$debugimap1 = $debugimap2 = 1 if ( $debugimap ) ;
$debug = 1 if ( $debugimap1 or $debugimap2 ) ;

# By default, don't take size to compare
$skipsize = ( defined $skipsize ) ? $skipsize : 1 ;

$uid1 = defined $uid1 ? $uid1 : 1 ;
$uid2 = defined $uid2 ? $uid2 : 1 ;

$subscribe = defined $subscribe ? $subscribe : 1 ;

# Allow size mismatch by default
$allowsizemismatch = defined $allowsizemismatch ? $allowsizemismatch : 1 ;

if ( defined $delete2foldersbutnot or defined $delete2foldersonly ) {
        $delete2folders = 1 ;
}

my $SSL_VERIFY_POLICY ;
my %SSL_VERIFY_STR ;

Readonly $SSL_VERIFY_POLICY => IO::Socket::SSL::SSL_VERIFY_NONE() ;
Readonly %SSL_VERIFY_STR    => (
        IO::Socket::SSL::SSL_VERIFY_NONE() => 'SSL_VERIFY_NONE, ie, do not check the certificate server.',
        IO::Socket::SSL::SSL_VERIFY_PEER() => 'SSL_VERIFY_PEER, ie, check the certificate server',
) ;
$IO::Socket::SSL::DEBUG = $sync->{debugssl} || 1 ;

if ( $sync->{ssl1} or $sync->{ssl2} or $sync->{tls1} or $sync->{tls2} ) {
        myprint( "SSL debug mode level is --debugssl $IO::Socket::SSL::DEBUG (can be set from 0 meaning no debug to 4 meaning max debug)\n" ) ;
}

if ( $sync->{ssl1} ) {
        myprint( qq{Host1: SSL default mode is like --sslargs1 "SSL_verify_mode=$SSL_VERIFY_POLICY", meaning for host1 $SSL_VERIFY_STR{$SSL_VERIFY_POLICY}\n} ) ;
        myprint( 'Host1: Use --sslargs1 SSL_verify_mode=' . IO::Socket::SSL::SSL_VERIFY_PEER() . " to have $SSL_VERIFY_STR{IO::Socket::SSL::SSL_VERIFY_PEER(  )} of host1\n" ) ;
}

if ( $sync->{ssl2} ) {
        myprint( qq{Host2: SSL default mode is like --sslargs2 "SSL_verify_mode=$SSL_VERIFY_POLICY", meaning for host2 $SSL_VERIFY_STR{$SSL_VERIFY_POLICY}\n} ) ;
        myprint( 'Host2: Use --sslargs2 SSL_verify_mode=' . IO::Socket::SSL::SSL_VERIFY_PEER() . " to have $SSL_VERIFY_STR{IO::Socket::SSL::SSL_VERIFY_PEER(  )} of host2\n" ) ;
}

if ( $sync->{justconnect} ) {
        justconnect() ;
        myprint( debugmemory( $sync, " after justconnect() call" ) ) ;
        exit_clean( $sync, $EX_OK ) ;
}

$sync->{user1} || missing_option( '--user1' ) ;
$sync->{user2} || missing_option( '--user2' ) ;

$syncinternaldates = defined $syncinternaldates ? $syncinternaldates : 1 ;

# Turn on expunge if there is not explicit option --noexpunge1 and option
# --delete1 is given.
# Done because --delete1 --noexpunge1 is very dangerous on the second run:
# the Deleted flag is then synced to all previously transferred messages.
# So --delete1 implies --expunge1 is a better usability default behavior.
if ( $delete1 ) {
        if ( !defined $expunge1 ) {
                myprint( "Info: turning on --expunge1 because --delete1 --noexpunge1 is very dangerous on the second run.\n" ) ;
                $expunge1 = 1 ;
        }
        myprint( "Info: if expunging after each message slows down too much the sync then use --noexpungeaftereach to speed up\n" ) ;
}

if ( $uidexpunge2 and not Mail::IMAPClient->can( 'uidexpunge' ) ) {
        myprint( "Failure: uidexpunge not supported (IMAPClient release < 3.17), use --expunge2 instead\n" ) ;
        exit_clean( $sync, $EX_SOFTWARE ) ;
}

if ( ( $delete2 or $delete2duplicates ) and not defined $uidexpunge2 ) {
        if ( Mail::IMAPClient->can( 'uidexpunge' ) ) {
                myprint( "Info: will act as --uidexpunge2\n" ) ;
                $uidexpunge2 = 1 ;
        }
        elsif ( not defined $expunge2 ) {
                myprint( "Info: will act as --expunge2 (no uidexpunge support)\n" ) ;
                $expunge2 = 1 ;
        }
}

if ( $delete1 and $delete2 ) {
        myprint( "Warning: using --delete1 and --delete2 together is almost always a bad idea, exiting imapsync\n" ) ;
        exit_clean( $sync, $EX_USAGE ) ;
}

if ( $idatefromheader ) {
        myprint( 'Turned ON idatefromheader, ', "will set the internal dates on host2 from the 'Date:' header line.\n" ) ;
        $syncinternaldates = 0 ;
}

if ( $syncinternaldates ) {
        myprint( 'Info: turned ON syncinternaldates, ', "will set the internal dates (arrival dates) on host2 same as host1.\n" ) ;
}
else {
        myprint( "Info: turned OFF syncinternaldates\n" ) ;
}

if ( defined $authmd5 and $authmd5 ) {
        $authmd51 = 1 ;
        $authmd52 = 1 ;
}

if ( defined $authmd51 and $authmd51 ) {
        $authmech1 ||= 'CRAM-MD5' ;
}
else {
        $authmech1 ||= $authuser1 ? 'PLAIN' : 'LOGIN' ;
}

if ( defined $authmd52 and $authmd52 ) {
        $authmech2 ||= 'CRAM-MD5' ;
}
else {
        $authmech2 ||= $authuser2 ? 'PLAIN' : 'LOGIN' ;
}

$authmech1 = uc $authmech1 ;
$authmech2 = uc $authmech2 ;

if ( defined $proxyauth1 && !$authuser1 ) {
        missing_option( 'With --proxyauth1, --authuser1' ) ;
}

if ( defined $proxyauth2 && !$authuser2 ) {
        missing_option( 'With --proxyauth2, --authuser2' ) ;
}

$authuser1 ||= $sync->{user1} ;
$authuser2 ||= $sync->{user2} ;

myprint( "Host1: will try to use $authmech1 authentication on host1\n" ) ;
myprint( "Host2: will try to use $authmech2 authentication on host2\n" ) ;

$timeout = defined $timeout ? $timeout : $DEFAULT_TIMEOUT ;

$sync->{h1}->{timeout} = defined $sync->{h1}->{timeout} ? $sync->{h1}->{timeout} : $timeout ;
myprint( "Host1: imap connexion timeout is $sync->{h1}->{timeout} seconds\n" ) ;
$sync->{h2}->{timeout} = defined $sync->{h2}->{timeout} ? $sync->{h2}->{timeout} : $timeout ;
myprint( "Host2: imap connexion timeout is $sync->{h2}->{timeout} seconds\n" ) ;

$syncacls = defined $syncacls ? $syncacls : 0 ;

# No folders sizes if --justfolders, unless really wanted.
if ( $justfolders and not defined $foldersizes ) { $foldersizes = 0 ; }

$foldersizes      = ( defined $foldersizes )      ? $foldersizes      : 1 ;
$foldersizesatend = ( defined $foldersizesatend ) ? $foldersizesatend : $foldersizes ;

$fastio1 = defined $fastio1 ? $fastio1 : 0 ;
$fastio2 = defined $fastio2 ? $fastio2 : 0 ;

$reconnectretry1 = defined $reconnectretry1 ? $reconnectretry1 : $DEFAULT_NB_RECONNECT_PER_IMAP_COMMAND ;
$reconnectretry2 = defined $reconnectretry2 ? $reconnectretry2 : $DEFAULT_NB_RECONNECT_PER_IMAP_COMMAND ;

# Since select_msgs() returns no messages when uidnext does not return something
# then $uidnext_default is never used. So I have to remove it.
$uidnext_default = $DEFAULT_UIDNEXT ;

if ( !@useheader ) { @useheader = qw( Message-Id Received ) ; }

my %useheader ;

# Make a hash %useheader of each --useheader 'key' in uppercase
for ( @useheader ) { $useheader{ uc $_ } = undef }

#myprint( Data::Dumper->Dump( [ \%useheader ] )  ) ;
#exit ;

myprint( "Host1: IMAP server [$sync->{host1}] port [$sync->{port1}] user [$sync->{user1}]\n" ) ;
myprint( "Host2: IMAP server [$sync->{host2}] port [$sync->{port2}] user [$sync->{user2}]\n" ) ;

get_password1( $sync ) ;
get_password2( $sync ) ;

$sync->{dry_message} = q{} ;
if ( $sync->{dry} ) {
        $sync->{dry_message} = "\t(not really since --dry mode)" ;
}

$search1 ||= $search if ( $search ) ;
$search2 ||= $search if ( $search ) ;

if ( $disarmreadreceipts ) {
        push @regexmess, q{s{\A((?:[^\n]+\r\n)+|)(^Disposition-Notification-To:[^\n]*\n)(\r?\n|.*\n\r?\n)}{$1X-$2$3}ims} ;
}

$pipemesscheck = ( defined $pipemesscheck ) ? $pipemesscheck : 1 ;

if ( @pipemess and $pipemesscheck ) {
        myprint( 'Checking each --pipemess command, ' . join( q{, }, @pipemess ) . ", with an space string. ( Can avoid this check with --nopipemesscheck )\n" ) ;
        my $string = pipemess( q{ }, @pipemess ) ;

        # string undef means something was bad.
        if ( not( defined $string ) ) {
                die_clean( "Error: one of --pipemess command is bad, check it\n" ) ;
        }
        myprint( "Ok with each --pipemess @pipemess\n" ) ;
}

if ( $maxlinelengthcmd ) {
        myprint( "Checking  --maxlinelengthcmd command,  $maxlinelengthcmd, with an space string.\n" ) ;
        my $string = pipemess( q{ }, $maxlinelengthcmd ) ;

        # string undef means something was bad.
        if ( not( defined $string ) ) {
                die_clean( "Error: --maxlinelengthcmd command is bad, check it\n" ) ;
        }
        myprint( "Ok with --maxlinelengthcmd $maxlinelengthcmd\n" ) ;
}

if ( @regexmess ) {
        my $string = regexmess( q{ } ) ;
        myprint( "Checking each --regexmess command with an space string.\n" ) ;

        # string undef means one of the eval regex was bad.
        if ( not( defined $string ) ) {
                die_clean( 'Error: one of --regexmess option is bad, check it' ) ;
        }
        myprint( "Ok with each --regexmess\n" ) ;
}

if ( @skipmess ) {
        myprint( "Checking each --skipmess command with an space string.\n" ) ;
        my $match = skipmess( q{ } ) ;

        # match undef means one of the eval regex was bad.
        if ( not( defined $match ) ) {
                die_clean( 'Error: one of --skipmess option is bad, check it' ) ;
        }
        myprint( "Ok with each --skipmess\n" ) ;
}

if ( @regexflag ) {
        myprint( "Checking each --regexflag command with an space string.\n" ) ;
        my $string = flags_regex( q{ } ) ;

        # string undef means one of the eval regex was bad.
        if ( not( defined $string ) ) {
                die_clean( 'Error: one of --regexflag option is bad, check it' ) ;
        }
        myprint( "Ok with each --regexflag\n" ) ;
}

$sync->{imap1} = my $imap1 = login_imap( $sync->{host1}, $sync->{port1}, $sync->{user1}, $domain1, $sync->{password1}, $debugimap1, $sync->{h1}->{timeout}, $fastio1, $sync->{ssl1}, $sync->{tls1}, $authmech1, $authuser1, $reconnectretry1, $proxyauth1, $uid1, $split1, 'Host1', $sync->{h1}, $sync ) ;

$sync->{imap2} = my $imap2 = login_imap( $sync->{host2}, $sync->{port2}, $sync->{user2}, $domain2, $sync->{password2}, $debugimap2, $sync->{h2}->{timeout}, $fastio2, $sync->{ssl2}, $sync->{tls2}, $authmech2, $authuser2, $reconnectretry2, $proxyauth2, $uid2, $split2, 'Host2', $sync->{h2}, $sync ) ;

$debug and myprint( 'Host1 Buffer I/O: ', $imap1->Buffer(), "\n" ) ;
$debug and myprint( 'Host2 Buffer I/O: ', $imap2->Buffer(), "\n" ) ;

if ( !$imap1->IsAuthenticated() ) { die_clean( 'Not authenticated on host1' ) ; }
myprint( "Host1: state Authenticated\n" ) ;
if ( !$imap2->IsAuthenticated() ) { die_clean( 'Not authenticated on host2' ) ; }
myprint( "Host2: state Authenticated\n" ) ;

myprint( 'Host1 capability once authenticated: ', join( q{ }, @{ $imap1->capability() || [] } ), "\n" ) ;
myprint( 'Host2 capability once authenticated: ', join( q{ }, @{ $imap2->capability() || [] } ), "\n" ) ;

# ID on by default since 1.832
$sync->{id} = defined $sync->{id} ? $sync->{id} : 1 ;
imap_id_stuff( $sync ) ;

#quota( $imap1, 'h1', $sync ) ; # quota on host1 is useless and pollute host2 output.
quota( $imap2, 'h2', $sync ) ;

if ( $sync->{justlogin} ) {
        $imap1->logout() ;
        $imap2->logout() ;
        exit_clean( $sync, $EX_OK ) ;
}

#
# Folder stuff
#

my ( @h1_folders_all, %h1_folders_all, @h1_folders_wanted, %requested_folder, %h1_subscribed_folder, %h2_subscribed_folder, @h2_folders_all, %h2_folders_all, %h2_folders_all_UPPER, @h2_folders_from_1_wanted, %h2_folders_from_1_wanted, %h2_folders_from_1_several, %h2_folders_from_1_all, ) ;

my $h1_folders_wanted_nb = 0 ;
my $h1_folders_wanted_ct = 0 ;    # counter of folders done.

# All folders on host1 and host2

@h1_folders_all = sort $imap1->folders() ;
@h2_folders_all = sort $imap2->folders() ;

myprint( 'Host1: found ', scalar @h1_folders_all, " folders.\n" ) ;
myprint( 'Host2: found ', scalar @h2_folders_all, " folders.\n" ) ;

foreach my $f ( @h1_folders_all ) {
        $h1_folders_all{$f} = 1;
}
foreach my $f ( @h2_folders_all ) {
        $h2_folders_all{$f} = 1 ;
        $h2_folders_all_UPPER{ uc $f } = 1 ;
}

$sync->{h1_folders_all}       = \%h1_folders_all ;
$sync->{h2_folders_all}       = \%h2_folders_all ;
$sync->{h2_folders_all_UPPER} = \%h2_folders_all_UPPER ;

# Make a hash of subscribed folders in both servers.

for ( $imap1->subscribed() ) { $h1_subscribed_folder{$_} = 1 }
for ( $imap2->subscribed() ) { $h2_subscribed_folder{$_} = 1 }

if ( defined $subfolder2 ) {
        unshift @regextrans2, q(s,^$sync->{h2_prefix}(.*),$sync->{h2_prefix}${subfolder2}${h2_sep}$1,), q(s,^INBOX$,$sync->{h2_prefix}${subfolder2}${h2_sep}INBOX,) ;

}

if ( $fixInboxINBOX and ( my $reg = fix_Inbox_INBOX_mapping( \%h1_folders_all, \%h2_folders_all ) ) ) {
        push @regextrans2, $reg ;
}

if (       ( $sync->{folder} and scalar @{ $sync->{folder} } )
        or $subscribed
        or scalar @folderrec )
{
        # folders given by option --folder
        if ( scalar @{ $sync->{folder} } ) {
                add_to_requested_folders( @{ $sync->{folder} } ) ;
        }

        # option --subscribed
        if ( $subscribed ) {
                add_to_requested_folders( keys %h1_subscribed_folder ) ;
        }

        # option --folderrec
        if ( scalar @folderrec ) {
                foreach my $folderrec ( @folderrec ) {
                        add_to_requested_folders( $imap1->folders( $folderrec ) ) ;
                }
        }
}
else {
        # no include, no folder/subscribed/folderrec options => all folders
        if ( not scalar @include ) {
                myprint( "Including all folders found by default. Use --subscribed or --folder or --folderrec or --include to select specific folders. Use --exclude to unselect specific folders.\n" ) ;
                add_to_requested_folders( @h1_folders_all ) ;
        }
}

# consider (optional) includes and excludes
if ( scalar @include ) {
        foreach my $include ( @include ) {
                my @included_folders = grep { /$include/ } @h1_folders_all ;
                add_to_requested_folders( @included_folders ) ;
                myprint( "Including folders matching pattern $include\n" . jux_utf8_list( @included_folders ) . "\n" ) ;
        }
}

if ( scalar @exclude ) {
        foreach my $exclude ( @exclude ) {
                my @requested_folder = sort keys %requested_folder ;
                my @excluded_folders = grep { /$exclude/ } @requested_folder ;
                remove_from_requested_folders( @excluded_folders ) ;
                myprint( "Excluding folders matching pattern $exclude\n" . jux_utf8_list( @excluded_folders ) . "\n" ) ;
        }
}

# sort before is not very powerful
# it adds --folderfirst and --folderlast even if they don't exist on host1
@h1_folders_wanted = sort_requested_folders() ;

# Remove no selectable folders

if ( $sync->{checkfoldersexist} ) {
        my @h1_folders_wanted_exist ;
        myprint( "Host1: Checking wanted folders exist. Use --nocheckfoldersexist to avoid this check (shared of public namespace targeted).\n" ) ;
        foreach my $folder ( @h1_folders_wanted ) {
                ( $debug or $sync->{debugfolders} ) and myprint( "Checking $folder exists on host1\n" ) ;
                if ( !exists $h1_folders_all{$folder} ) {
                        myprint( "Host1: warning! ignoring folder $folder because it is not in host1 whole folders list.\n" ) ;
                        next ;
                }
                else {
                        push @h1_folders_wanted_exist, $folder ;
                }
        }
        @h1_folders_wanted = @h1_folders_wanted_exist ;
}
else {
        myprint( "Host1: Not checking that wanted folders exist. Remove --nocheckfoldersexist to get this check.\n" ) ;
}

if ( $sync->{checkselectable} ) {
        my @h1_folders_wanted_selectable ;
        myprint( "Host1: Checking wanted folders are selectable. Use --nocheckselectable to avoid this check.\n" ) ;
        foreach my $folder ( @h1_folders_wanted ) {
                ( $debug or $sync->{debugfolders} ) and myprint( "Checking $folder is selectable on host1\n" ) ;

                # It does an imap command  LIST "" $folder   and then search for no \Noselect
                if ( !$imap1->selectable( $folder ) ) {
                        myprint( "Host1: warning! ignoring folder $folder because it is not selectable\n" ) ;
                }
                else {
                        push @h1_folders_wanted_selectable, $folder ;
                }
        }
        @h1_folders_wanted = @h1_folders_wanted_selectable ;
        ( $debug or $sync->{debugfolders} ) and myprint( 'Host1: checking folders took ', timenext(), " s\n" ) ;
}
else {
        myprint( "Host1: Not checking that wanted folders are selectable. Remove --nocheckselectable to get this check.\n" ) ;
}

$sync->{h1_folders_wanted} = \@h1_folders_wanted ;

my ( $h1_sep, $h2_sep ) ;

# what are the private folders separators for each server ?

( $debug or $sync->{debugfolders} ) and myprint( "Getting separators\n" ) ;
$h1_sep = get_separator( $imap1, $sep1, '--sep1', 'Host1', \@h1_folders_all ) ;
$h2_sep = get_separator( $imap2, $sep2, '--sep2', 'Host2', \@h2_folders_all ) ;

$sync->{h1_prefix} = get_prefix( $imap1, $prefix1, '--prefix1', 'Host1', \@h1_folders_all ) ;
$sync->{h2_prefix} = get_prefix( $imap2, $prefix2, '--prefix2', 'Host2', \@h2_folders_all ) ;

myprint( "Host1 separator and prefix: [$h1_sep][$sync->{ h1_prefix }]\n" ) ;
myprint( "Host2 separator and prefix: [$h2_sep][$sync->{ h2_prefix }]\n" ) ;

# this hack is because LWP post does not pass well a hash in the $form parameter
# but it does pass well an array
%{ $sync->{f1f2h} } = split_around_equal( @{ $sync->{f1f2} } ) ;

automap( $sync ) ;

foreach my $h1_fold ( @h1_folders_wanted ) {
        my $h2_fold ;
        $h2_fold = imap2_folder_name( $h1_fold ) ;
        $h2_folders_from_1_wanted{$h2_fold}++ ;
        if ( 1 < $h2_folders_from_1_wanted{$h2_fold} ) {
                $h2_folders_from_1_several{$h2_fold}++ ;
        }
}
@h2_folders_from_1_wanted = sort keys %h2_folders_from_1_wanted ;

foreach my $h1_fold ( @h1_folders_all ) {
        my $h2_fold ;
        $h2_fold = imap2_folder_name( $h1_fold ) ;
        $h2_folders_from_1_all{$h2_fold}++ ;
}

myprint( << 'END_LISTING' ) ;

++++ Listing folders
All foldernames are presented between brackets like [X] where X is the foldername.
When a foldername contains non-ASCII characters it is presented in the form
[X] = [Y] where
X is the imap foldername you have to use in command line options and
Y is the utf8 output just printed for convenience, to recognize it.

END_LISTING

print
  "Host1 folders list (first the raw imap format then the [X] = [Y]):\n",
  $imap1->list(),
  "\n",
  jux_utf8_list( @h1_folders_all ),
  "\n",
  "Host2 folders list (first the raw imap format then the [X] = [Y]):\n",
  $imap2->list(),
  "\n",
  jux_utf8_list( @h2_folders_all ),
  "\n",
  q{} ;

print
  'Host1 subscribed folders list: ', jux_utf8_list( sort keys %h1_subscribed_folder ), "\n"
  if ( $subscribed ) ;

my @h2_folders_not_in_1 ;
@h2_folders_not_in_1 = list_folders_in_2_not_in_1() ;

if ( @h2_folders_not_in_1 ) {
        myprint( "Folders in host2 not in host1:\n", jux_utf8_list( @h2_folders_not_in_1 ), "\n" ) ;
}

if ( keys %{ $sync->{f1f2auto} } ) {
        myprint( "Folders mapping from --automap feature (use --f1f2 to override any mapping):\n" ) ;
        foreach my $h1_fold ( keys %{ $sync->{f1f2auto} } ) {
                my $h2_fold = $sync->{f1f2auto}{$h1_fold} ;
                myprintf( "%-40s -> %-40s\n", jux_utf8( $h1_fold ), jux_utf8( $h2_fold ) ) ;
        }
        myprint( "\n" ) ;
}

if ( keys %{ $sync->{f1f2h} } ) {
        myprint( "Folders mapping from --f1f2 options, it overrides --automap:\n" ) ;
        foreach my $h1_fold ( keys %{ $sync->{f1f2h} } ) {
                my $h2_fold = $sync->{f1f2h}{$h1_fold} ;
                my $warn    = q{} ;
                if ( not exists $h1_folders_all{$h1_fold} ) {
                        $warn = "BUT $h1_fold does NOT exist on host1!" ;
                }
                myprintf( "%-40s -> %-40s %s\n", jux_utf8( $h1_fold ), jux_utf8( $h2_fold ), $warn ) ;
        }
        myprint( "\n" ) ;
}

exit_clean( $sync, $EX_OK ) if ( $sync->{justfolderlists} ) ;
exit_clean( $sync, $EX_OK ) if ( $sync->{justautomap} ) ;

debugsleep( $sync ) ;

if ( $foldersizes ) {
        foldersizes_on_h1h2() ;
}

exit_clean( $sync, $EX_OK ) if ( $justfoldersizes ) ;

$sync->{stats} = 1 ;

if ( $sync->{'delete1emptyfolders'} ) {
        delete1emptyfolders( $sync ) ;
}

delete_folders_in_2_not_in_1() if $delete2folders ;

# folder loop
$h1_folders_wanted_nb = scalar @h1_folders_wanted ;

myprint( "++++ Looping on each one of $h1_folders_wanted_nb folders to sync\n" ) ;

$sync->{begin_transfer_time} = time ;

my %uid_candidate_for_deletion ;
my %uid_candidate_no_deletion ;

my %h2_folders_of_md5 = () ;

FOLDER: foreach my $h1_fold ( @h1_folders_wanted ) {

        if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

        my $h2_fold = imap2_folder_name( $h1_fold ) ;

        $h1_folders_wanted_ct++ ;
        myprintf( "Folder %7s %-35s -> %-35s\n", "$h1_folders_wanted_ct/$h1_folders_wanted_nb", jux_utf8( $h1_fold ), jux_utf8( $h2_fold ) ) ;
        myprint( debugmemory( $sync, " at folder loop" ) ) ;

        # host1 can not be fetched read only, select is needed because of expunge.
        select_folder( $imap1, $h1_fold, 'Host1' ) or next FOLDER;

        debugsleep( $sync ) ;

        my $h1_fold_nb_messages = count_from_select( $imap1->History ) ;
        myprint( "Host1 folder [$h1_fold] has $h1_fold_nb_messages messages in total (mentioned by SELECT)\n" ) ;

        if ( $skipemptyfolders and 0 == $h1_fold_nb_messages ) {
                myprint( "Skipping empty host1 folder [$h1_fold]\n" ) ;
                next FOLDER;
        }

        if ( !exists $h2_folders_all{$h2_fold} ) {
                create_folder( $imap2, $h2_fold, $h1_fold ) or next FOLDER;
        }

        acls_sync( $h1_fold, $h2_fold ) ;

        # Sometimes the folder on host2 is listed (it exists) but is
        # not selectable but becomes selectable by a create (Gmail)
        select_folder( $imap2, $h2_fold, 'Host2' )
          or (      create_folder( $imap2, $h2_fold, $h1_fold )
                and select_folder( $imap2, $h2_fold, 'Host2' ) )
          or next FOLDER;
        my @select_results = $imap2->Results() ;

        my $h2_fold_nb_messages = count_from_select( @select_results ) ;
        myprint( "Host2 folder [$h2_fold] has $h2_fold_nb_messages messages in total (mentioned by SELECT)\n" ) ;

        my $permanentflags2 = permanentflags( @select_results ) ;
        myprint( "Host2 folder [$h2_fold] permanentflags: $permanentflags2\n" ) ;

        if ( $expunge1 ) {
                myprint( "Host1: Expunging $h1_fold $sync->{dry_message}\n" ) ;
                if ( !$sync->{dry} ) { $imap1->expunge() }
        }

        if ( ( ( $subscribe and exists $h1_subscribed_folder{$h1_fold} ) or $subscribeall )
                and not exists $h2_subscribed_folder{$h2_fold} )
        {
                myprint( "Host2: Subscribing to folder $h2_fold\n" ) ;
                if ( !$sync->{dry} ) { $imap2->subscribe( $h2_fold ) }
        }

        next FOLDER if ( $justfolders ) ;

        if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

        my $h1_msgs_all_hash_ref = {} ;
        my @h1_msgs = select_msgs( $imap1, $h1_msgs_all_hash_ref, $search1, $sync->{abletosearch1}, $h1_fold ) ;

        if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

        my $h1_msgs_nb = scalar @h1_msgs ;
        $h1{$h1_fold}{'messages_nb'} = $h1_msgs_nb ;

        myprint( "Host1 folder [$h1_fold] considering $h1_msgs_nb messages\n" ) ;
        ( $debug or $debuglist ) and myprint( "Host1 folder [$h1_fold] considering $h1_msgs_nb messages, LIST gives: @h1_msgs\n" ) ;
        $debug and myprint( "Host1 selecting messages of folder [$h1_fold] took ", timenext(), " s\n" ) ;

        my $h2_msgs_all_hash_ref = {} ;
        my @h2_msgs = select_msgs( $imap2, $h2_msgs_all_hash_ref, $search2, $sync->{abletosearch2}, $h2_fold ) ;

        if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

        my $h2_msgs_nb = scalar @h2_msgs ;
        $h2{$h2_fold}{'messages_nb'} = $h2_msgs_nb ;

        myprint( "Host2 folder [$h2_fold] considering $h2_msgs_nb messages\n" ) ;
        ( $debug or $debuglist ) and myprint( "Host2 folder [$h2_fold] considering $h2_msgs_nb messages, LIST gives: @h2_msgs\n" ) ;
        $debug and myprint( "Host2 selecting messages of folder [$h2_fold] took ", timenext(), " s\n" ) ;

        my $cache_base = "$tmpdir/imapsync_cache/" ;
        my $cache_dir = cache_folder( $cache_base, "$sync->{host1}/$sync->{user1}/$sync->{host2}/$sync->{user2}", $h1_fold, $h2_fold ) ;
        my ( $cache_1_2_ref, $cache_2_1_ref ) = ( {}, {} ) ;

        my $h1_uidvalidity = $imap1->uidvalidity() || q{} ;
        my $h2_uidvalidity = $imap2->uidvalidity() || q{} ;

        if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

        if ( $usecache ) {
                myprint( "cache directory: $cache_dir\n" ) ;
                mkpath( "$cache_dir" ) ;
                ( $cache_1_2_ref, $cache_2_1_ref ) = get_cache( $cache_dir, \@h1_msgs, \@h2_msgs, $h1_msgs_all_hash_ref, $h2_msgs_all_hash_ref ) ;
                myprint( 'CACHE h1 h2: ', scalar keys %{$cache_1_2_ref}, " files\n" ) ;
                $debug and myprint( '[', map ( {"$_->$cache_1_2_ref->{$_} "} keys %{$cache_1_2_ref} ), " ]\n" ) ;
        }

        my %h1_hash = () ;
        my %h2_hash = () ;

        my ( %h1_msgs, %h2_msgs ) ;
        @h1_msgs{@h1_msgs} = () ;
        @h2_msgs{@h2_msgs} = () ;

        my @h1_msgs_in_cache = sort { $a <=> $b } keys %{$cache_1_2_ref} ;
        my @h2_msgs_in_cache = keys %{$cache_2_1_ref} ;

        my ( %h1_msgs_not_in_cache, %h2_msgs_not_in_cache ) ;
        %h1_msgs_not_in_cache = %h1_msgs ;
        %h2_msgs_not_in_cache = %h2_msgs ;
        delete @h1_msgs_not_in_cache{@h1_msgs_in_cache} ;
        delete @h2_msgs_not_in_cache{@h2_msgs_in_cache} ;

        my @h1_msgs_not_in_cache = keys %h1_msgs_not_in_cache ;

        #myprint( "h1_msgs_not_in_cache: [@h1_msgs_not_in_cache]\n"  ) ;
        my @h2_msgs_not_in_cache = keys %h2_msgs_not_in_cache ;

        my @h2_msgs_delete2_not_in_cache = () ;
        %h1_msgs_copy_by_uid = () ;

        if ( $useuid ) {

                # use uid so we have to avoid getting header
                @h1_msgs_copy_by_uid{@h1_msgs_not_in_cache} = () ;
                @h2_msgs_delete2_not_in_cache = @h2_msgs_not_in_cache if $usecache ;
                @h1_msgs_not_in_cache         = () ;
                @h2_msgs_not_in_cache         = () ;

                #myprint( "delete2: @h2_msgs_delete2_not_in_cache\n" ) ;
        }

        $debug and myprint( "Host1 parsing headers of folder [$h1_fold]\n" ) ;

        my ( $h1_heads_ref, $h1_fir_ref ) = ( {}, {} ) ;
        $h1_heads_ref = $imap1->parse_headers( [@h1_msgs_not_in_cache], @useheader ) if ( @h1_msgs_not_in_cache ) ;
        $debug and myprint( "Host1 parsing headers of folder [$h1_fold] took ", timenext(), " s\n" ) ;

        @{$h1_fir_ref}{@h1_msgs} = ( undef ) ;

        $debug and myprint( "Host1 getting flags idate and sizes of folder [$h1_fold]\n" ) ;
        if ( $sync->{abletosearch1} ) {
                $h1_fir_ref = $imap1->fetch_hash( \@h1_msgs, 'FLAGS', 'INTERNALDATE', 'RFC822.SIZE', $h1_fir_ref )
                  if ( @h1_msgs ) ;
        }
        else {
                my $uidnext         = $imap1->uidnext( $h1_fold ) || $uidnext_default ;
                my $fetch_hash_uids = $fetch_hash_set             || "1:$uidnext" ;
                $h1_fir_ref = $imap1->fetch_hash( $fetch_hash_uids, 'FLAGS', 'INTERNALDATE', 'RFC822.SIZE', $h1_fir_ref )
                  if ( @h1_msgs ) ;
        }
        $debug and myprint( "Host1 getting flags idate and sizes of folder [$h1_fold] took ", timenext(), " s\n" ) ;
        if ( !$h1_fir_ref ) {
                my $error = join( q{}, "Host1 folder $h1_fold: Could not fetch_hash ", scalar @h1_msgs, ' msgs: ', $imap1->LastError || q{}, "\n" ) ;
                errors_incr( $sync, $error ) ;
                next FOLDER;
        }

        my @h1_msgs_duplicate ;
        foreach my $m ( @h1_msgs_not_in_cache ) {
                my $rc = parse_header_msg( $sync, $imap1, $m, $h1_heads_ref, $h1_fir_ref, 'Host1', \%h1_hash ) ;
                if ( !defined $rc ) {
                        my $h1_size = $h1_fir_ref->{$m}->{'RFC822.SIZE'} || 0 ;
                        myprint( "Host1 $h1_fold/$m size $h1_size ignored (no wanted headers so we ignore this message. To solve this: use --addheader)\n" ) ;
                        $total_bytes_skipped += $h1_size ;
                        $nb_msg_skipped      += 1 ;
                        $h1_nb_msg_noheader  += 1 ;
                        $h1_nb_msg_processed += 1 ;
                }
                elsif ( 0 == $rc ) {

                        # duplicate
                        push @h1_msgs_duplicate, $m ;

                        # duplicate, same id same size?
                        my $h1_size = $h1_fir_ref->{$m}->{'RFC822.SIZE'} || 0 ;
                        $nb_msg_skipped           += 1 ;
                        $h1_total_bytes_duplicate += $h1_size ;
                        $h1_nb_msg_duplicate      += 1 ;
                        $h1_nb_msg_processed      += 1 ;
                }
        }
        my $h1_msgs_duplicate_nb = scalar @h1_msgs_duplicate ;
        $h1{$h1_fold}{'duplicates_nb'} = $h1_msgs_duplicate_nb ;

        $debug and myprint( "Host1 selected: $h1_msgs_nb  duplicates: $h1_msgs_duplicate_nb\n" ) ;
        $debug and myprint( 'Host1 whole time parsing headers took ', timenext(), " s\n" ) ;

        # Getting headers and metada can be so long that host2 might be disconnected here
        if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

        $debug and myprint( "Host2 parsing headers of folder [$h2_fold]\n" ) ;

        my ( $h2_heads_ref, $h2_fir_ref ) = ( {}, {} ) ;
        $h2_heads_ref = $imap2->parse_headers( [@h2_msgs_not_in_cache], @useheader ) if ( @h2_msgs_not_in_cache ) ;
        $debug and myprint( "Host2 parsing headers of folder [$h2_fold] took ", timenext(), " s\n" ) ;

        $debug and myprint( "Host2 getting flags idate and sizes of folder [$h2_fold]\n" ) ;
        @{$h2_fir_ref}{@h2_msgs} = () ;    # fetch_hash can select by uid with last arg as ref

        if ( $sync->{abletosearch2} and scalar( @h2_msgs ) ) {
                $h2_fir_ref = $imap2->fetch_hash( \@h2_msgs, 'FLAGS', 'INTERNALDATE', 'RFC822.SIZE', $h2_fir_ref ) ;
        }
        else {
                my $uidnext         = $imap2->uidnext( $h2_fold ) || $uidnext_default ;
                my $fetch_hash_uids = $fetch_hash_set             || "1:$uidnext" ;
                $h2_fir_ref = $imap2->fetch_hash( $fetch_hash_uids, 'FLAGS', 'INTERNALDATE', 'RFC822.SIZE', $h2_fir_ref )
                  if ( @h2_msgs ) ;
        }

        $debug and myprint( "Host2 getting flags idate and sizes of folder [$h2_fold] took ", timenext(), " s\n" ) ;

        my @h2_msgs_duplicate ;
        foreach my $m ( @h2_msgs_not_in_cache ) {
                my $rc = parse_header_msg( $sync, $imap2, $m, $h2_heads_ref, $h2_fir_ref, 'Host2', \%h2_hash ) ;
                my $h2_size = $h2_fir_ref->{$m}->{'RFC822.SIZE'} || 0 ;
                if ( !defined $rc ) {
                        myprint( "Host2 $h2_fold/$m size $h2_size ignored (no wanted headers so we ignore this message)\n" ) ;
                        $h2_nb_msg_noheader += 1 ;
                }
                elsif ( 0 == $rc ) {

                        # duplicate
                        $h2_nb_msg_duplicate += 1 ;
                        $h2_total_bytes_duplicate += $h2_size ;
                        push @h2_msgs_duplicate, $m ;
                }
        }

        # %h2_folders_of_md5
        foreach my $md5 ( keys %h2_hash ) {
                $h2_folders_of_md5{$md5}->{$h2_fold}++ ;
        }

        my $h2_msgs_duplicate_nb = scalar @h2_msgs_duplicate ;
        $h2{$h2_fold}{'duplicates_nb'} = $h2_msgs_duplicate_nb ;

        myprint( "Host2 folder $h2_fold selected: $h2_msgs_nb messages,  duplicates: $h2_msgs_duplicate_nb\n" )
          if ( $debug or $delete2duplicates or $h2_msgs_duplicate_nb ) ;
        $debug and myprint( 'Host2 whole time parsing headers took ', timenext(), " s\n" ) ;

        $debug and myprint( "++++ Verifying [$h1_fold] -> [$h2_fold]\n" ) ;

        # messages in host1 that are not in host2

        my @h1_hash_keys_sorted_by_uid =
          sort { $h1_hash{$a}{'m'} <=> $h1_hash{$b}{'m'} } keys %h1_hash ;

        #myprint( map { $h1_hash{$_}{'m'} . q{ }} @h1_hash_keys_sorted_by_uid ) ;

        my @h2_hash_keys_sorted_by_uid =
          sort { $h2_hash{$a}{'m'} <=> $h2_hash{$b}{'m'} } keys %h2_hash ;

        if ( $delete2duplicates and not exists $h2_folders_from_1_several{$h2_fold} ) {
                my @h2_expunge ;

                foreach my $h2_msg ( @h2_msgs_duplicate ) {
                        myprint( "msg $h2_fold/$h2_msg marked \\Deleted [duplicate] on host2 $sync->{dry_message}\n" ) ;
                        push @h2_expunge, $h2_msg if $uidexpunge2 ;
                        if ( !$sync->{dry} ) {
                                $imap2->delete_message( $h2_msg ) ;
                                $h2_nb_msg_deleted += 1 ;
                        }
                }
                my $cnt = scalar @h2_expunge ;
                if ( @h2_expunge and not $expunge2 ) {
                        myprint( "Host2: UidExpunging $cnt message(s) in folder $h2_fold $sync->{dry_message}\n" ) ;
                        $imap2->uidexpunge( \@h2_expunge ) if !$sync->{dry} ;
                }
                if ( $expunge2 ) {
                        myprint( "Host2: Expunging folder $h2_fold $sync->{dry_message}\n" ) ;
                        $imap2->expunge() if !$sync->{dry} ;
                }
        }

        if ( $delete2 and not exists $h2_folders_from_1_several{$h2_fold} ) {

                # No host1 folders f1a f1b ... going all to same f2 (via --regextrans2)
                my @h2_expunge ;
                foreach my $m_id ( @h2_hash_keys_sorted_by_uid ) {

                        #myprint( "$m_id " ) ;
                        if ( !exists $h1_hash{$m_id} ) {
                                my $h2_msg   = $h2_hash{$m_id}{'m'} ;
                                my $h2_flags = $h2_hash{$m_id}{'F'} || q{} ;
                                my $isdel    = $h2_flags =~ /\B\\Deleted\b/x ? 1 : 0 ;
                                myprint( "Host2: msg $h2_fold/$h2_msg marked \\Deleted on host2 [$m_id] $sync->{dry_message}\n" )
                                  if !$isdel ;
                                push @h2_expunge, $h2_msg if $uidexpunge2 ;
                                if ( !( $sync->{dry} or $isdel ) ) {
                                        $imap2->delete_message( $h2_msg ) ;
                                        $h2_nb_msg_deleted += 1 ;
                                }
                        }
                }
                foreach my $h2_msg ( @h2_msgs_delete2_not_in_cache ) {
                        myprint( "Host2: msg $h2_fold/$h2_msg marked \\Deleted [not in cache] on host2 $sync->{dry_message}\n" ) ;
                        push @h2_expunge, $h2_msg if $uidexpunge2 ;
                        if ( !$sync->{dry} ) {
                                $imap2->delete_message( $h2_msg ) ;
                                $h2_nb_msg_deleted += 1 ;
                        }
                }
                my $cnt = scalar @h2_expunge ;

                if ( @h2_expunge and not $expunge2 ) {
                        myprint( "Host2: UidExpunging $cnt message(s) in folder $h2_fold $sync->{dry_message}\n" ) ;
                        $imap2->uidexpunge( \@h2_expunge ) if !$sync->{dry} ;
                }
                if ( $expunge2 ) {
                        myprint( "Host2: Expunging folder $h2_fold $sync->{dry_message}\n" ) ;
                        $imap2->expunge() if !$sync->{dry} ;
                }
        }

        if ( $delete2 and exists $h2_folders_from_1_several{$h2_fold} ) {
                myprint( "Host2 folder $h2_fold $h2_folders_from_1_several{ $h2_fold } folders left to sync there\n" ) ;
                my @h2_expunge ;
                foreach my $m_id ( @h2_hash_keys_sorted_by_uid ) {
                        my $h2_msg = $h2_hash{$m_id}{'m'} ;
                        if ( !exists $h1_hash{$m_id} ) {
                                my $h2_flags = $h2_hash{$m_id}{'F'} || q{} ;
                                my $isdel = $h2_flags =~ /\B\\Deleted\b/x ? 1 : 0 ;
                                if ( !$isdel ) {
                                        $debug and myprint( "Host2: msg $h2_fold/$h2_msg candidate for deletion [$m_id]\n" ) ;
                                        $uid_candidate_for_deletion{$h2_fold}{$h2_msg}++ ;
                                }
                        }
                        else {
                                $debug and myprint( "Host2: msg $h2_fold/$h2_msg will cancel deletion [$m_id]\n" ) ;
                                $uid_candidate_no_deletion{$h2_fold}{$h2_msg}++ ;
                        }
                }
                foreach my $h2_msg ( @h2_msgs_delete2_not_in_cache ) {
                        myprint( "Host2: msg $h2_fold/$h2_msg candidate for deletion [not in cache]\n" ) ;
                        $uid_candidate_for_deletion{$h2_fold}{$h2_msg}++ ;
                }

                foreach my $h2_msg ( @h2_msgs_in_cache ) {
                        myprint( "Host2: msg $h2_fold/$h2_msg will cancel deletion [in cache]\n" ) ;
                        $uid_candidate_no_deletion{$h2_fold}{$h2_msg}++ ;
                }

                if ( 0 == $h2_folders_from_1_several{$h2_fold} ) {

                        # last host1 folder going to $h2_fold
                        myprint( "Last host1 folder going to $h2_fold\n" ) ;
                        foreach my $h2_msg ( keys %{ $uid_candidate_for_deletion{$h2_fold} } ) {
                                $debug and myprint( "Host2: msg $h2_fold/$h2_msg candidate for deletion\n" ) ;
                                if ( exists $uid_candidate_no_deletion{$h2_fold}{$h2_msg} ) {
                                        $debug and myprint( "Host2: msg $h2_fold/$h2_msg canceled deletion\n" ) ;
                                }
                                else {
                                        myprint( "Host2: msg $h2_fold/$h2_msg marked \\Deleted $sync->{dry_message}\n" ) ;
                                        push @h2_expunge, $h2_msg if $uidexpunge2 ;
                                        if ( !$sync->{dry} ) {
                                                $imap2->delete_message( $h2_msg ) ;
                                                $h2_nb_msg_deleted += 1 ;
                                        }
                                }
                        }
                }

                my $cnt = scalar @h2_expunge ;
                if ( @h2_expunge and not $expunge2 ) {
                        myprint( "Host2: UidExpunging $cnt message(s) in folder $h2_fold $sync->{dry_message}\n" ) ;
                        $imap2->uidexpunge( \@h2_expunge ) if !$sync->{dry} ;
                }
                if ( $expunge2 ) {
                        myprint( "Host2: Expunging host2 folder $h2_fold $sync->{dry_message}\n" ) ;
                        $imap2->expunge() if !$sync->{dry} ;
                }

                $h2_folders_from_1_several{$h2_fold}-- ;
        }

        my $h2_uidnext = $imap2->uidnext( $h2_fold ) ;
        $debug and myprint( "Host2 uidnext: $h2_uidnext\n" ) ;
        $h2_uidguess = $h2_uidnext ;

        # Getting host2 headers, metada and delete2 stuff can be so long that host1 might be disconnected here
        if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

      MESS: foreach my $m_id ( @h1_hash_keys_sorted_by_uid ) {
                if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

                #myprint( "h1_nb_msg_processed: $h1_nb_msg_processed\n"  ) ;
                my $h1_size  = $h1_hash{$m_id}{'s'} ;
                my $h1_msg   = $h1_hash{$m_id}{'m'} ;
                my $h1_idate = $h1_hash{$m_id}{'D'} ;

                if (
                        ( not exists $h2_hash{$m_id} )
                        and (      not( exists $h2_folders_of_md5{$m_id} )
                                or not $skipcrossduplicates )
                  )
                {
                        # copy
                        my $h2_msg = copy_message( $sync, $h1_msg, $h1_fold, $h2_fold, $h1_fir_ref, $permanentflags2, $cache_dir ) ;
                        $h2_folders_of_md5{$m_id}->{$h2_fold}++ ;
                        if ( $delete2 and ( exists $h2_folders_from_1_several{$h2_fold} ) and $h2_msg ) {
                                myprint( "Host2: msg $h2_fold/$h2_msg will cancel deletion [fresh copy] on host2\n" ) ;
                                $uid_candidate_no_deletion{$h2_fold}{$h2_msg}++ ;
                        }
                        last FOLDER if total_bytes_max_reached() ;
                        next MESS;
                }
                else {
                        # already on host2
                        if ( exists $h2_hash{$m_id} ) {
                                my $h2_msg = $h2_hash{$m_id}{'m'} ;
                                $debug and myprint( "Host1 found msg $h1_fold/$h1_msg equals Host2 $h2_fold/$h2_msg\n" ) ;
                                if ( $usecache ) {
                                        $debugcache and myprint( "touch $cache_dir/${h1_msg}_$h2_msg\n" ) ;
                                        touch( "$cache_dir/${h1_msg}_$h2_msg" )
                                          or croak( "Couldn't touch $cache_dir/${h1_msg}_$h2_msg" ) ;
                                }
                        }
                        elsif ( exists $h2_folders_of_md5{$m_id} ) {
                                my @folders_dup = keys %{ $h2_folders_of_md5{$m_id} } ;
                                ( $debug or $debugcrossduplicates ) and myprint( "Host1 found msg $h1_fold/$h1_msg is also in Host2 folders @folders_dup\n" ) ;
                        }
                        $total_bytes_skipped += $h1_size ;
                        $nb_msg_skipped      += 1 ;
                        $h1_nb_msg_processed += 1 ;
                }

                if ( exists $h2_hash{$m_id} ) {

                        #$debug and myprint( "MESSAGE $m_id\n" ) ;
                        my $h2_msg = $h2_hash{$m_id}{'m'} ;
                        if ( $sync->{resyncflags} ) {
                                sync_flags_fir( $h1_fold, $h1_msg, $h2_fold, $h2_msg, $permanentflags2, $h1_fir_ref, $h2_fir_ref ) ;
                        }

                        # Good
                        my $h2_size = $h2_hash{$m_id}{'s'} ;
                        $debug and myprint( "Host1 size  msg $h1_fold/$h1_msg = $h1_size <> $h2_size = Host2 $h2_fold/$h2_msg\n" ) ;
                }

                if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

                if ( $delete1 ) {
                        delete_message_on_host1( $h1_msg, $h1_fold ) ;
                }
        }

        # END MESS: loop
        if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }
      MESS_IN_CACHE: foreach my $h1_msg ( @h1_msgs_in_cache ) {
                my $h2_msg = $cache_1_2_ref->{$h1_msg} ;
                $debugcache and myprint( "cache messages update flags $h1_msg->$h2_msg\n" ) ;
                if ( $sync->{resyncflags} ) {
                        sync_flags_fir( $h1_fold, $h1_msg, $h2_fold, $h2_msg, $permanentflags2, $h1_fir_ref, $h2_fir_ref ) ;
                }
                my $h1_size = $h1_fir_ref->{$h1_msg}->{'RFC822.SIZE'} || 0 ;
                $total_bytes_skipped += $h1_size ;
                $nb_msg_skipped      += 1 ;
                $h1_nb_msg_processed += 1 ;
                if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

        }

        #myprint( "Messages by uid: ", map { "$_ " } keys %h1_msgs_copy_by_uid, "\n"  ) ;
      MESS_BY_UID: foreach my $h1_msg ( sort { $a <=> $b } keys %h1_msgs_copy_by_uid ) {
                #
                $debug and myprint( "Copy by uid $h1_fold/$h1_msg\n" ) ;
                if ( !reconnect_12_if_needed( $sync ) ) { last FOLDER; }

                my $h2_msg = copy_message( $sync, $h1_msg, $h1_fold, $h2_fold, $h1_fir_ref, $permanentflags2, $cache_dir ) ;
                if ( $delete2 and exists $h2_folders_from_1_several{$h2_fold} and $h2_msg ) {
                        myprint( "Host2: msg $h2_fold/$h2_msg will cancel deletion [fresh copy] on host2\n" ) ;
                        $uid_candidate_no_deletion{$h2_fold}{$h2_msg}++ ;
                }
                last FOLDER if total_bytes_max_reached() ;
        }

        if ( $expunge1 ) {
                myprint( "Host1: Expunging folder $h1_fold $sync->{dry_message}\n" ) ;
                if ( !$sync->{dry} ) { $imap1->expunge() }
        }
        if ( $expunge2 ) {
                myprint( "Host2: Expunging folder $h2_fold $sync->{dry_message}\n" ) ;
                if ( !$sync->{dry} ) { $imap2->expunge() }
        }
        $debug and myprint( 'Time: ', timenext(), " s\n" ) ;
}

myprint( "++++ End looping on each folder\n" ) ;

if ( $delete1 and $sync->{'delete1emptyfolders'} ) {
        delete1emptyfolders( $sync ) ;
}

( $debug or $sync->{debugfolders} ) and myprint( 'Time: ', timenext(), " s\n" ) ;

if ( $foldersizesatend ) {
        myprint( << 'END_SIZE' ) ;

Folders sizes after the synchronization.
You can remove this foldersizes listing by using  "--nofoldersizesatend"
END_SIZE

        foldersizesatend() ;
}

if ( !lost_connection( $imap1, "for host1 [$sync->{host1}]" ) ) { $imap1->logout() ; }
if ( !lost_connection( $imap2, "for host2 [$sync->{host2}]" ) ) { $imap2->logout() ; }

stats( $sync ) ;
myprint( errorsdump( $sync->{nb_errors}, errors_log( $sync ) ) ) if ( $sync->{errorsdump} ) ;
tests_live_result( $sync->{nb_errors} ) if ( $sync->{testslive} or $sync->{testslive6} ) ;

exit_clean( $sync, $EXIT_WITH_ERRORS ) if ( $sync->{nb_errors} ) ;
exit_clean( $sync, $EX_OK ) ;

# END of main program

# subroutines
sub myprint  { return print @ARG ; }
sub myprintf { return printf @ARG ; }

sub mysprintf {
        my ( $format, @list ) = @ARG ;
        return sprintf $format, @list ;
}

sub output_start {
        my $mysync = shift @ARG ;

        if ( not $mysync ) { return ; }

        my @output = @ARG ;
        $mysync->{output} = join( q{}, @output ) . ( $mysync->{output} || q{} ) ;
        return $mysync->{output} ;
}

sub tests_output_start {
        note( 'Entering tests_output_start()' ) ;

        my $mysync = {} ;

        is( undef, output_start(),          'output_start: no args => undef' ) ;
        is( q{},   output_start( $mysync ), 'output_start: one arg => ""' ) ;
        is( 'rrrr',       output_start( $mysync, 'rrrr' ), 'output_start: rrrr => rrrr' ) ;
        is( 'aaaarrrr',   output_start( $mysync, 'aaaa' ), 'output_start: aaaa => aaaarrrr' ) ;
        is( "\naaaarrrr", output_start( $mysync, "\n" ),   'output_start: \n => \naaaarrrr' ) ;
        is( "ABC\naaaarrrr", output_start( $mysync, 'A', 'B', 'C' ), 'output_start: A B C => ABC\naaaarrrr' ) ;

        note( 'Leaving  tests_output_start()' ) ;
        return ;
}

sub tests_output {
        note( 'Entering tests_output()' ) ;

        my $mysync = {} ;

        is( undef, output(),          'output: no args => undef' ) ;
        is( q{},   output( $mysync ), 'output: one arg => ""' ) ;
        is( 'rrrr',       output( $mysync, 'rrrr' ), 'output: rrrr => rrrr' ) ;
        is( 'rrrraaaa',   output( $mysync, 'aaaa' ), 'output: aaaa => rrrraaaa' ) ;
        is( "rrrraaaa\n", output( $mysync, "\n" ),   'output: \n => rrrraaaa\n' ) ;
        is( "rrrraaaa\nABC", output( $mysync, 'A', 'B', 'C' ), 'output: A B C => rrrraaaaABC\n' ) ;

        note( 'Leaving  tests_output()' ) ;
        return ;
}

sub output {
        my $mysync = shift @ARG ;

        if ( not $mysync ) { return ; }

        my @output = @ARG ;
        $mysync->{output} .= join( q{}, @output ) ;
        return $mysync->{output} ;
}

sub tests_output_reset_with {
        note( 'Entering tests_output_reset_with()' ) ;

        my $mysync = {} ;

        is( undef, output_reset_with(),          'output_reset_with: no args => undef' ) ;
        is( q{},   output_reset_with( $mysync ), 'output_reset_with: one arg => ""' ) ;
        is( 'rrrr', output_reset_with( $mysync, 'rrrr' ), 'output_reset_with: rrrr => rrrr' ) ;
        is( 'aaaa', output_reset_with( $mysync, 'aaaa' ), 'output_reset_with: aaaa => aaaa' ) ;
        is( "\n",   output_reset_with( $mysync, "\n" ),   'output_reset_with: \n => \n' ) ;

        note( 'Leaving  tests_output_reset_with()' ) ;
        return ;
}

sub output_reset_with {
        my $mysync = shift @ARG ;

        if ( not $mysync ) { return ; }

        my @output = @ARG ;
        $mysync->{output} = join( q{}, @output ) ;
        return $mysync->{output} ;
}

sub abort {
        my $mysync = shift @ARG ;
        if ( !-r $sync->{pidfile} ) {
                myprint( "Can not read pidfile $sync->{pidfile}. Exiting.\n" ) ;
                exit $EX_OK ;
        }
        my $pidtokill = firstline( $sync->{pidfile} ) ;
        if ( !$pidtokill ) {
                myprint( "No process to abort. Exiting.\n" ) ;
                exit $EX_OK ;
        }

        # First ask for suicide
        if ( kill 'ZERO', $pidtokill ) {
                myprint( "Sending signal QUIT to PID $pidtokill \n" ) ;
                kill 'QUIT', $pidtokill ;
                sleep 1 ;
        }
        else {
                myprint( "Can not send signal to PID $pidtokill. Exiting.\n" ) ;
                exit $EX_OK ;
        }

        # Then murder
        if ( kill 'ZERO', $pidtokill ) {
                myprint( "Sending signal KILL to PID $pidtokill \n" ) ;
                kill 'KILL', $pidtokill ;
                sleep 1 ;
        }
        else {
                myprint( "Process PID $pidtokill ended. Exiting.\n" ) ;
                exit $EX_OK ;
        }

        # Well ...
        if ( kill 'ZERO', $pidtokill ) {
                myprint( "Process PID $pidtokill still there. Can not do much. Exiting.\n" ) ;
                exit $EX_OK ;
        }

        return ;
}

sub docker_context {
        my $mysync = shift ;
        -e '/.dockerenv' || return ;
        myprint( "Docker context detected with /.dockerenv\n" ) ;

        # No pidfile
        $mysync->{pidfile} = q{} ;

        # No log
        $mysync->{log} = 0 ;

        # In case
        myprint( "Changing current directory to /var/tmp/\n" ) ;
        chdir '/var/tmp/' ;

        return ;
}

sub cgibegin {
        my $mysync = shift ;
        if ( !under_cgi_context( $mysync ) ) { return ; }
        require CGI ;
        CGI->import( qw( -no_debug ) ) ;
        require CGI::Carp ;
        CGI::Carp->import( qw( fatalsToBrowser ) ) ;
        $mysync->{cgi} = CGI->new() ;
        return ;
}

sub tests_under_cgi_context {
        note( 'Entering tests_under_cgi_context()' ) ;

        # $ENV{SERVER_SOFTWARE} = 'under imapsync' ;
        do {
                # Not in cgi context
                delete local $ENV{SERVER_SOFTWARE} ;
                is( undef, under_cgi_context(), 'under_cgi_context: SERVER_SOFTWARE unset => not in cgi context' ) ;
        } ;
        do {
                # In cgi context
                local $ENV{SERVER_SOFTWARE} = 'under imapsync' ;
                is( 1, under_cgi_context(), 'under_cgi_context: SERVER_SOFTWARE set => in cgi context' ) ;
        } ;
        do {
                # Not in cgi context
                delete local $ENV{SERVER_SOFTWARE} ;
                is( undef, under_cgi_context(), 'under_cgi_context: SERVER_SOFTWARE unset => not in cgi context' ) ;
        } ;
        do {
                # In cgi context
                local $ENV{SERVER_SOFTWARE} = 'under imapsync' ;
                is( 1, under_cgi_context(), 'under_cgi_context: SERVER_SOFTWARE set => in cgi context' ) ;
        } ;
        note( 'Leaving  tests_under_cgi_context()' ) ;
        return ;
}

sub under_cgi_context {
        my $mysync = shift ;

        # Under cgi context
        if ( $ENV{SERVER_SOFTWARE} ) {
                return 1 ;
        }

        # Not in cgi context
        return ;
}

sub cgibuildheader {
        my $mysync = shift ;
        if ( !under_cgi_context( $mysync ) ) { return ; }

        my $imapsync_runs = $mysync->{cgi}->cookie( 'imapsync_runs' ) || 0 ;
        my $cookie = $mysync->{cgi}->cookie(
                -name    => 'imapsync_runs',
                -value   => 1 + $imapsync_runs,
                -expires => '+20y',
                -path    => '/cgi-bin/imapsync',
        ) ;
        my $httpheader ;
        if ( $mysync->{abort} ) {
                $httpheader = $mysync->{cgi}->header(
                        -type   => 'text/plain',
                        -status => '200 OK to abort syncing IMAP boxes' . ". Here is " . hostname(),
                ) ;
        }
        elsif ( $mysync->{loaddelay} ) {

                # https://tools.ietf.org/html/rfc2616#section-10.5.4
                # 503 Service Unavailable
                # The server is currently unable to handle the request due to a temporary overloading or maintenance of the server.
                $httpheader = $mysync->{cgi}->header(
                        -type   => 'text/plain',
                        -status => '503 Service Unavailable' . ". Be back in $mysync->{ loaddelay } min. Load on " . hostname() . " is $mysync->{ loadavg }",
                ) ;
        }
        else {
                $httpheader = $mysync->{cgi}->header(
                        -type   => 'text/plain',
                        -status => '200 OK to sync IMAP boxes' . ". Load on " . hostname() . " is $mysync->{ loadavg }",
                        -cookie => $cookie,
                ) ;
        }
        output_start( $mysync, $httpheader ) ;

        return ;
}

sub cgiload {
        my $mysync = shift ;
        if ( !under_cgi_context( $mysync ) ) { return ; }
        if ( $mysync->{abort} )              { return ; }    # keep going to abort
        if ( $mysync->{loaddelay} ) {
                myprint( "Server is on heavy load. Be back in $mysync->{ loaddelay } min. Load is $mysync->{ loadavg }\n" ) ;
                exit_clean( $mysync, $EX_UNAVAILABLE ) ;
        }
        return ;
}

sub tests_set_umask {
        note( 'Entering tests_set_umask()' ) ;
        my $save_umask = umask ;

        my $mysync = {} ;
        if ( 'MSWin32' eq $OSNAME ) {
                is( undef, set_umask( $mysync ), "set_umask: set failure to $UMASK_PARANO on MSWin32" ) ;
        }
        else {
                is( 1, set_umask( $mysync ), "set_umask: set to $UMASK_PARANO" ) ;
        }

        umask $save_umask ;
        note( 'Leaving  tests_set_umask()' ) ;
        return ;
}

sub set_umask {
        my $mysync         = shift ;
        my $previous_umask = umask_str() ;
        my $new_umask      = umask_str( $UMASK_PARANO ) ;
        output( $mysync, "Umask set with $new_umask (was $previous_umask)\n" ) ;
        if ( $new_umask eq $UMASK_PARANO ) {
                return 1 ;
        }
        return ;
}

sub tests_umask_str {
        note( 'Entering tests_umask_str()' ) ;
        my $save_umask = umask ;

        is( umask_str(), umask_str(), 'umask_str: no parameters => idopotent' ) ;
        is( my $save_umask_str = umask_str(), umask_str(), 'umask_str: no parameters => idopotent + save' ) ;
        is( '0000', umask_str( q{ } ),   'umask_str:  q{ } => 0000' ) ;
        is( '0000', umask_str( q{} ),    'umask_str:   q{} => 0000' ) ;
        is( '0000', umask_str( '0000' ), 'umask_str:  0000 => 0000' ) ;
        is( '0000', umask_str( '0' ),    'umask_str:     0 => 0000' ) ;
        is( '0200', umask_str( '0200' ), 'umask_str:  0200 => 0200' ) ;
        is( '0400', umask_str( '0400' ), 'umask_str:  0400 => 0400' ) ;
        is( '0600', umask_str( '0600' ), 'umask_str:  0600 => 0600' ) ;

      SKIP: {
                if ( 'MSWin32' eq $OSNAME ) { skip( 'Tests success only for Unix', 6 ) ; }
                is( '0100',          umask_str( '0100' ),        'umask_str:  0100 => 0100' ) ;
                is( '0001',          umask_str( '0001' ),        'umask_str:  0001 => 0001' ) ;
                is( '0777',          umask_str( '0777' ),        'umask_str:  0777 => 0777' ) ;
                is( '0777',          umask_str( '00777' ),       'umask_str: 00777 => 0777' ) ;
                is( '0777',          umask_str( ' 777 ' ),       'umask_str:  777  => 0777' ) ;
                is( "$UMASK_PARANO", umask_str( $UMASK_PARANO ), "umask_str: UMASK_PARANO $UMASK_PARANO => $UMASK_PARANO" ) ;
        }

        is( $save_umask_str, umask_str( $save_umask_str ), 'umask_str: restore with str' ) ;
        is( $save_umask,     umask,                        'umask_str: umask is restored, controlled by direct umask' ) ;
        is( $save_umask,     umask $save_umask,            'umask_str: umask is restored by direct umask' ) ;
        is( $save_umask,     umask,                        'umask_str: umask initial controlled by direct umask' ) ;

        note( 'Leaving  tests_umask_str()' ) ;
        return ;
}

sub umask_str {
        my $value = shift ;

        if ( defined $value ) {
                umask oct( $value ) ;
        }
        my $current = umask ;

        return ( sprintf( '%#04o', $current ) ) ;
}

sub tests_umask {
        note( 'Entering tests_umask()' ) ;
        my $save_umask ;
        is( umask, umask, 'umask: umask is umask' ) ;
        is( $save_umask = umask, umask, "umask: umask is umask again + save it: $save_umask" ) ;
        is( $save_umask, umask oct( 0000 ), 'umask: umask 0000' ) ;
        is( oct( 0000 ), umask,             'umask: umask is now 0000' ) ;
        is( oct( 0000 ), umask oct( 777 ),  'umask: umask 0777 call, previous 0000' ) ;

      SKIP: {
                if ( 'MSWin32' eq $OSNAME ) { skip( 'Tests success only for Unix', 2 ) ; }
                is( oct( 777 ), umask,             'umask: umask is now  0777' ) ;
                is( oct( 777 ), umask $save_umask, "umask: umask $save_umask restore inital value, previous 0777" ) ;
        }

        ok( defined umask $save_umask, "umask: umask $save_umask restore inital value, previous defined" ) ;
        is( $save_umask, umask, 'umask: umask is umask restored' ) ;
        note( 'Leaving  tests_umask()' ) ;

        return ;
}

sub cgisetcontext {
        my $mysync = shift ;
        if ( !under_cgi_context( $mysync ) ) { return ; }

        output( $mysync, "Under cgi context\n" ) ;
        set_umask( $mysync ) ;

        # Remove all content in unsafe evaled options
        @regextrans2          = () ;
        @regexflag            = () ;
        @regexmess            = () ;
        @skipmess             = () ;
        @pipemess             = () ;
        $delete2foldersonly   = undef ;
        $delete2foldersbutnot = undef ;
        $maxlinelengthcmd     = undef ;

        # Set safe default values (I hope...)

        $mysync->{pidfile}        = 'imapsync.pid' ;
        $mysync->{pidfilelocking} = 1 ;
        $mysync->{errorsmax}      = $ERRORS_MAX_CGI ;
        $modulesversion           = 0 ;
        $mysync->{releasecheck}   = defined $mysync->{releasecheck} ? $mysync->{releasecheck} : 1 ;
        $usecache                 = 0 ;
        $mysync->{showpasswords}  = 0 ;
        $debugimap1 = $debugimap2 = $debugimap = 0 ;
        $reconnectretry1 = $reconnectretry2 = $DEFAULT_NB_RECONNECT_PER_IMAP_COMMAND ;
        $pipemesscheck = 0 ;

        $mysync->{hashfile} = $CGI_HASHFILE ;
        my $hashsynclocal = hashsynclocal( $mysync ) || die "Can not get hashsynclocal. Exiting\n" ;
        $cgidir = $CGI_TMPDIR_TOP . '/' . $hashsynclocal ;

        -d $cgidir or mkpath $cgidir or die "Can not create $cgidir: $OS_ERROR\n" ;
        chdir $cgidir or die "Can not cd to $cgidir: $OS_ERROR\n" ;
        $tmpdir = $cgidir ;
        cgioutputenvcontext( $mysync ) ;
        $debug and output( $mysync, 'Current directory is ' . getcwd() . "\n" ) ;
        $debug and output( $mysync, 'Real user id is ' . getpwuid_any_os( $REAL_USER_ID ) . " (uid $REAL_USER_ID)\n" ) ;
        $debug and output( $mysync, 'Effective user id is ' . getpwuid_any_os( $EFFECTIVE_USER_ID ) . " (euid $EFFECTIVE_USER_ID)\n" ) ;

        # @{ $mysync->{ sigexit }  } = ( 'QUIT' ) ;
        # output( $mysync, "Setting the QUIT signal to exit properly\n" ) ;
        return ;
}

sub cgioutputenvcontext {
        my $mysync = shift @ARG ;

        for my $envvar ( qw( REMOTE_ADDR REMOTE_HOST HTTP_REFERER HTTP_USER_AGENT HTTP_COOKIE ) ) {

                my $envval = $ENV{$envvar} || q{} ;
                if ( $envval ) { output( $mysync, "$envvar is $envval\n" ) }
        }

        return ;
}

sub debugsleep {
        my $mysync = shift @ARG ;
        if ( defined $mysync->{debugsleep} ) {
                myprint( "Info: sleeping $mysync->{debugsleep}s\n" ) ;
                sleep $mysync->{debugsleep} ;
        }
        return ;
}

sub foldersizes_on_h1h2 {
        myprint( << 'END_SIZE' ) ;

Folders sizes before the synchronization.
You can remove foldersizes listings by using "--nofoldersizes" and  "--nofoldersizesatend"
but then you will also lose the ETA (Estimation Time of Arrival) given after each message copy.
END_SIZE

        ( $h1_nb_msg_start, $h1_bytes_start ) = foldersizes( 'Host1', $imap1, $search1, $sync->{abletosearch1}, @h1_folders_wanted ) ;
        ( $h2_nb_msg_start, $h2_bytes_start ) = foldersizes( 'Host2', $imap2, $search2, $sync->{abletosearch2}, @h2_folders_from_1_wanted ) ;

        if ( not all_defined( $h1_nb_msg_start, $h1_bytes_start, $h2_nb_msg_start, $h2_bytes_start ) ) {
                my $error = "Failure getting foldersizes, ETA and final diff will not be displayed\n" ;
                errors_incr( $sync, $error ) ;
                $foldersizes      = 0 ;
                $foldersizesatend = 0 ;
                return ;
        }

        my $h2_bytes_limit = $sync->{h2}->{quota_limit_bytes} || 0 ;
        if ( $h2_bytes_limit and ( $h2_bytes_limit < $h1_bytes_start ) ) {
                my $quota_percent = mysprintf( '%.0f', $NUMBER_100 * $h1_bytes_start / $h2_bytes_limit ) ;
                my $error = "Host2: Quota limit will be exceeded! Over $quota_percent % ( $h1_bytes_start bytes / $h2_bytes_limit bytes )\n" ;
                errors_incr( $sync, $error ) ;
        }
        return ;
}

sub total_bytes_max_reached {

        return ( 0 ) if not $exitwhenover ;
        if ( $sync->{total_bytes_transferred} >= $exitwhenover ) {
                myprint( "Maximum bytes transferred reached, $sync->{total_bytes_transferred} >= $exitwhenover, ending sync\n" ) ;
                return ( 1 ) ;
        }

}

sub all_defined {
        if ( not @ARG ) {
                return 0 ;
        }
        foreach my $elem ( @ARG ) {
                if ( not defined $elem ) {
                        return 0 ;
                }
        }
        return 1 ;
}

sub tests_all_defined {
        note( 'Entering tests_all_defined()' ) ;

        is( 0, all_defined(), 'all_defined: no param  => 0' ) ;
        is( 0, all_defined( () ), 'all_defined: void list => 0' ) ;
        is( 0, all_defined( undef ), 'all_defined: undef     => 0' ) ;
        is( 0, all_defined( undef, undef ), 'all_defined: undef     => 0' ) ;
        is( 0, all_defined( 1,     undef ), 'all_defined: 1 undef   => 0' ) ;
        is( 0, all_defined( undef, 1 ),     'all_defined: undef 1   => 0' ) ;
        is( 1, all_defined( 1,     1 ),     'all_defined: 1 1   => 1' ) ;
        is( 1, all_defined( ( 1, 1 ) ), 'all_defined: (1 1) => 1' ) ;

        note( 'Leaving  tests_all_defined()' ) ;
        return ;
}

sub tests_hashsynclocal {
        note( 'Entering tests_hashsynclocal()' ) ;

        my $mysync = {
                host1     => '',
                user1     => '',
                password1 => '',
                host2     => '',
                user2     => '',
                password2 => '',
        } ;

        is( undef, hashsynclocal( $mysync ), 'hashsynclocal: no hashfile name' ) ;

        $mysync->{hashfile} = '' ;
        is( undef, hashsynclocal( $mysync ), 'hashsynclocal: empty hashfile name' ) ;

        $mysync->{hashfile} = './noexist/rrr' ;
        is( undef, hashsynclocal( $mysync ), 'hashsynclocal: no exists hashfile dir' ) ;

      SKIP: {
                if ( 'MSWin32' eq $OSNAME ) { skip( 'Tests only for Unix', 1 ) ; }
                $mysync->{hashfile} = '/rrr' ;
                is( undef, hashsynclocal( $mysync ), 'hashsynclocal: permission denied' ) ;
        }
        ok( ( -d 'W/tmp/tests/' or mkpath( 'W/tmp/tests/' ) ), 'hashsynclocal: mkpath W/tmp/tests/' ) ;
        $mysync->{hashfile} = 'W/tmp/tests/imapsync_hash' ;

        ok( !-e 'W/tmp/tests/imapsync_hash' || unlink 'W/tmp/tests/imapsync_hash', 'hashsynclocal: unlink W/tmp/tests/imapsync_hash' ) ;
        ok( !-e 'W/tmp/tests/imapsync_hash', 'hashsynclocal: verify there is no W/tmp/tests/imapsync_hash' ) ;
        is( 'ecdeb4ede672794d173da4e08c52b8ee19b7d252', hashsynclocal( $mysync, 'mukksyhpmbixkxkpjlqivmlqsulpictj' ), 'hashsynclocal: creating/reading W/tmp/tests/imapsync_hash' ) ;

        # A second time now
        is( 'ecdeb4ede672794d173da4e08c52b8ee19b7d252', hashsynclocal( $mysync ), 'hashsynclocal: reading W/tmp/tests/imapsync_hash second time => same' ) ;

        note( 'Leaving  tests_hashsynclocal()' ) ;
        return ;
}

sub hashsynclocal {
        my $mysync   = shift ;
        my $hashkey  = shift ;                 # Optional, only there for tests
        my $hashfile = $mysync->{hashfile} ;
        $hashfile = createhashfileifneeded( $hashfile, $hashkey ) ;
        if ( !$hashfile ) {
                return ;
        }
        $hashkey = firstline( $hashfile ) ;
        if ( !$hashkey ) {
                myprint( "No hashkey!\n" ) ;
                return ;
        }
        my $hashsynclocal = hashsync( $mysync, $hashkey ) ;
        return ( $hashsynclocal ) ;

}

sub tests_hashsync {
        note( 'Entering tests_hashsync()' ) ;

        is( 'fbdb1d1b18aa6c08324b7d64b71fb76370690e1d', hashsync( {}, q{} ), 'hashsync: empty args' ) ;
        my $mysync ;
        $mysync->{host1} = 'zzz' ;
        is( 'e86a28a3611c1e7bbaf8057cd00ae122781a11fe', hashsync( $mysync, q{} ), 'hashsync: host1 zzz => ' ) ;
        is( 'e86a28a3611c1e7bbaf8057cd00ae122781a11fe', hashsync( $mysync, q{} ), 'hashsync: host1 zzz => ' ) ;
        $mysync->{host2} = 'zzz' ;
        is( '15959573e4a86763253a7aedb1a2b0c60d133dc2', hashsync( $mysync, q{} ), 'hashsync: + host2 zzz => ' ) ;
        is( 'b8d4ab541b209c75928528020ca28ee43488bd8f', hashsync( $mysync, 'A' ), 'hashsync: + hashkey A => ' ) ;

        note( 'Leaving  tests_hashsync()' ) ;
        return ;
}

sub hashsync {
        my $mysync  = shift ;
        my $hashkey = shift ;

        my $mystring = join( q{}, $mysync->{host1} || q{}, $mysync->{user1} || q{}, $mysync->{password1} || q{}, $mysync->{host2} || q{}, $mysync->{user2} || q{}, $mysync->{password2} || q{}, ) ;
        my $hashsync = hmac_sha1_hex( $mystring, $hashkey ) ;

        #myprint( "$hashsync\n" ) ;
        return ( $hashsync ) ;
}

sub tests_createhashfileifneeded {
        note( 'Entering tests_createhashfileifneeded()' ) ;

        is( undef, createhashfileifneeded(), 'createhashfileifneeded: no parameters => undef' ) ;

        note( 'Leaving  tests_createhashfileifneeded()' ) ;
        return ;
}

sub createhashfileifneeded {
        my $hashfile = shift ;
        my $hashkey = shift || rand32() ;

        # no name
        if ( !$hashfile ) {
                return ;
        }

        # already there
        if ( -e -r $hashfile ) {
                return $hashfile ;
        }

        # not creatable
        if ( !-w dirname( $hashfile ) ) {
                return ;
        }

        # creatable
        open my $FILE_HANDLE, '>', $hashfile
          or do {
                myprint( "Could not open $hashfile for writing. Check permissions or disk space." ) ;
                return ;
          } ;
        myprint( "Writing random hashkey in $hashfile, once for all times\n" ) ;
        print $FILE_HANDLE $hashkey ;
        close $FILE_HANDLE ;

        # Should be there now
        if ( -e -r $hashfile ) {
                return $hashfile ;
        }

        # unknown failure
        return ;
}

sub tests_rand32 {
        note( 'Entering tests_rand32()' ) ;

        my $string = rand32() ;
        myprint( "$string\n" ) ;
        is( 32, length( $string ),  'rand32: 32 characters long' ) ;
        is( 32, length( rand32() ), 'rand32: 32 characters long, another one' ) ;

        note( 'Leaving  tests_rand32()' ) ;
        return ;
}

sub rand32 {
        my @chars = ( "a" .. "z" ) ;
        my $string ;
        $string .= $chars[ rand @chars ] for 1 .. 32 ;
        return $string ;
}

sub imap_id_stuff {
        my $mysync = shift ;

        if ( not $mysync->{id} ) { return ; }

        $mysync->{h1_imap_id} = imap_id( $mysync, $mysync->{imap1}, 'Host1' ) ;

        #myprint( 'Host1: ' . $mysync->{h1_imap_id}  ) ;
        $mysync->{h2_imap_id} = imap_id( $mysync, $mysync->{imap2}, 'Host2' ) ;

        #myprint( 'Host2: ' . $mysync->{h2_imap_id}  ) ;

        return ;
}

sub imap_id {
        my ( $mysync, $imap, $Side ) = @_ ;

        $Side ||= q{} ;
        my $imap_id_response = q{} ;

        if ( not $imap->has_capability( 'ID' ) ) {
                $imap_id_response = 'No ID capability' ;
                myprint( "$Side: No ID capability\n" ) ;
        }
        else {
                my $id_inp = imapsync_id( $mysync, { side => lc $Side } ) ;
                myprint( "\n$Side: found ID capability. Sending/receiving ID, presented in raw IMAP for now.\n" . "In order to avoid sending/receiving ID, use option --noid\n" ) ;
                my $debug_before = $imap->Debug() ;
                $imap->Debug( 1 ) ;
                my $id_out = $imap->tag_and_run( 'ID ' . $id_inp ) ;

                #my $id_out = $imap->tag_and_run( 'ID NIL' ) ;
                myprint( "\n" ) ;
                $imap->Debug( $debug_before ) ;

                #$imap_id_response = Data::Dumper->Dump( [ $id_out ], [ 'IMAP_ID' ] ) ;
        }
        return ( $imap_id_response ) ;
}

sub imapsync_id {
        my $mysync      = shift ;
        my $overhashref = shift ;

        # See http://tools.ietf.org/html/rfc2971.html

        my $imapsync_id = {} ;

        my $imapsync_id_lamiral = {
                name          => 'imapsync',
                version       => imapsync_version( $mysync ),
                os            => $OSNAME,
                vendor        => 'Gilles LAMIRAL',
                'support-url' => 'https://imapsync.lamiral.info/',

                # Example of date-time:  19-Sep-2015 08:56:07
                date => date_from_rcs( q{$Date: 2018/04/08 17:25:54 $ } ),
        } ;

        my $imapsync_id_github = {
                name          => 'imapsync',
                version       => imapsync_version( $mysync ),
                os            => $OSNAME,
                vendor        => 'github',
                'support-url' => 'https://github.com/imapsync/imapsync',
                date          => date_from_rcs( q{$Date: 2018/04/08 17:25:54 $ } ),
        } ;

        $imapsync_id = $imapsync_id_lamiral ;

        #$imapsync_id = $imapsync_id_github ;
        my %mix = ( %{$imapsync_id}, %{$overhashref} ) ;
        my $imapsync_id_str = format_for_imap_arg( \%mix ) ;

        #myprint( "$imapsync_id_str\n"  ) ;
        return ( $imapsync_id_str ) ;
}

sub tests_imapsync_id {
        note( 'Entering tests_imapsync_id()' ) ;

        my $mysync ;
        ok(
                '("name" "imapsync" "version" "111" "os" "beurk" "vendor" "Gilles LAMIRAL" "support-url" "https://imapsync.lamiral.info/" "date" "22-12-1968" "side" "host1")' eq imapsync_id(
                        $mysync,
                        {
                                version => 111,
                                os      => 'beurk',
                                date    => '22-12-1968',
                                side    => 'host1'
                        }
                ),
                'tests_imapsync_id override'
        ) ;

        note( 'Leaving  tests_imapsync_id()' ) ;
        return ;
}

sub format_for_imap_arg {
        my $ref = shift ;

        my $string = q{} ;
        my %terms  = %{$ref} ;
        my @terms  = () ;
        if ( not( %terms ) ) { return ( 'NIL' ) }

        # sort like in RFC then add extra key/values
        foreach my $key ( qw( name version os os-version vendor support-url address date command arguments environment) ) {
                if ( $terms{$key} ) {
                        push @terms, $key, $terms{$key} ;
                        delete $terms{$key} ;
                }
        }
        push @terms, %terms ;
        $string = '(' . ( join q{ }, map { '"' . $_ . '"' } @terms ) . ')' ;
        return ( $string ) ;
}

sub tests_format_for_imap_arg {
        note( 'Entering tests_format_for_imap_arg()' ) ;

        ok( 'NIL' eq format_for_imap_arg( {} ), 'format_for_imap_arg empty hash ref' ) ;
        ok( '("name" "toto")' eq format_for_imap_arg( { name => 'toto' } ), 'format_for_imap_arg { name => toto }' ) ;
        ok( '("name" "toto" "key" "val")' eq format_for_imap_arg( { name => 'toto', key => 'val' } ), 'format_for_imap_arg 2 x key val' ) ;

        note( 'Leaving  tests_format_for_imap_arg()' ) ;
        return ;
}

sub quota {
        my ( $imap, $side, $mysync ) = @_ ;

        my %side = (
                h1 => 'Host1',
                h2 => 'Host2',
        ) ;
        my $Side         = $side{$side} ;
        my $debug_before = $imap->Debug() ;
        $imap->Debug( 1 ) ;
        if ( not $imap->has_capability( 'QUOTA' ) ) {
                $imap->Debug( $debug_before ) ;
                return ;
        }
        myprint( "\n$Side: found quota, presented in raw IMAP\n" ) ;
        my $getquotaroot = $imap->getquotaroot( 'INBOX' ) ;

        # Gmail INBOX quotaroot is "" but with it Mail::IMAPClient does a literal GETQUOTA {2} \n ""
        #$imap->quota( 'ROOT' ) ;
        #$imap->quota( '""' ) ;
        myprint( "\n" ) ;
        $imap->Debug( $debug_before ) ;
        my $quota_limit_bytes   = quota_extract_storage_limit_in_bytes( $getquotaroot ) ;
        my $quota_current_bytes = quota_extract_storage_current_in_bytes( $getquotaroot ) ;
        $mysync->{$side}->{quota_limit_bytes}   = $quota_limit_bytes ;
        $mysync->{$side}->{quota_current_bytes} = $quota_current_bytes ;
        my $quota_percent ;

        if ( $quota_limit_bytes > 0 ) {
                $quota_percent = mysprintf( '%.2f', $NUMBER_100 * $quota_current_bytes / $quota_limit_bytes ) ;
        }
        else {
                $quota_percent = 0 ;
        }
        myprint( "$Side: Quota current storage is $quota_current_bytes bytes. Limit is $quota_limit_bytes bytes. So $quota_percent % full\n" ) ;
        if ( $QUOTA_PERCENT_LIMIT < $quota_percent ) {
                my $error = "$Side: $quota_percent % full: it is time to find a bigger place! ( $quota_current_bytes bytes / $quota_limit_bytes bytes )\n" ;
                errors_incr( $mysync, $error ) ;
        }
        return ;
}

sub tests_quota_extract_storage_limit_in_bytes {
        note( 'Entering tests_quota_extract_storage_limit_in_bytes()' ) ;

        my $imap_output = [ '* QUOTAROOT "INBOX" "Storage quota" "Messages quota"', '* QUOTA "Storage quota" (STORAGE 1 104857600)', '* QUOTA "Messages quota" (MESSAGE 2 100000)', '5 OK Getquotaroot completed.' ] ;
        ok( $NUMBER_104_857_600 * $KIBI == quota_extract_storage_limit_in_bytes( $imap_output ), 'quota_extract_storage_limit_in_bytes ' ) ;

        note( 'Leaving  tests_quota_extract_storage_limit_in_bytes()' ) ;
        return ;
}

sub quota_extract_storage_limit_in_bytes {
        my $imap_output = shift ;

        my $limit_kb ;
        $limit_kb = ( map { /.*\(\s*STORAGE\s+\d+\s+(\d+)\s*\)/x ? $1 : () } @{$imap_output} )[0] ;
        $limit_kb ||= 0 ;
        $debug and myprint( "storage_limit_kb = $limit_kb\n" ) ;
        return ( $KIBI * $limit_kb ) ;
}

sub tests_quota_extract_storage_current_in_bytes {
        note( 'Entering tests_quota_extract_storage_current_in_bytes()' ) ;

        my $imap_output = [ '* QUOTAROOT "INBOX" "Storage quota" "Messages quota"', '* QUOTA "Storage quota" (STORAGE 1 104857600)', '* QUOTA "Messages quota" (MESSAGE 2 100000)', '5 OK Getquotaroot completed.' ] ;
        ok( 1 * $KIBI == quota_extract_storage_current_in_bytes( $imap_output ), 'quota_extract_storage_current_in_bytes: 1 => 1024 ' ) ;

        note( 'Leaving  tests_quota_extract_storage_current_in_bytes()' ) ;
        return ;
}

sub quota_extract_storage_current_in_bytes {
        my $imap_output = shift ;

        my $current_kb ;
        $current_kb = ( map { /.*\(\s*STORAGE\s+(\d+)\s+\d+\s*\)/x ? $1 : () } @{$imap_output} )[0] ;
        $current_kb ||= 0 ;
        $debug and myprint( "storage_current_kb = $current_kb\n" ) ;
        return ( $KIBI * $current_kb ) ;

}

sub automap {
        my ( $mysync ) = @_ ;

        if ( $mysync->{automap} ) {
                myprint( "Turned on automapping folders ( use --noautomap to turn off automapping )\n" ) ;
        }
        else {
                myprint( "Turned off automapping folders ( use --automap to turn on automapping )\n" ) ;
                return ;
        }

        $mysync->{h1_special} = special_from_folders_hash( $mysync->{imap1}, 'Host1' ) ;
        $mysync->{h2_special} = special_from_folders_hash( $mysync->{imap2}, 'Host2' ) ;

        build_possible_special( $mysync ) ;
        build_guess_special( $mysync ) ;
        build_automap( $mysync ) ;

        return ;
}

sub build_guess_special {
        my ( $mysync ) = shift ;

        foreach my $h1_fold ( sort keys %{ $mysync->{h1_folders_all} } ) {
                my $special = guess_special( $h1_fold, $mysync->{possible_special}, $mysync->{h1_prefix} ) ;
                if ( $special ) {
                        $mysync->{h1_special_guessed}{$h1_fold} = $special ;
                        my $already_guessed = $mysync->{h1_special_guessed}{$special} ;
                        if ( $already_guessed ) {
                                myprint( "Host1: $h1_fold not $special because set to $already_guessed\n" ) ;
                        }
                        else {
                                $mysync->{h1_special_guessed}{$special} = $h1_fold ;
                        }
                }
        }
        foreach my $h2_fold ( sort keys %{ $mysync->{h2_folders_all} } ) {
                my $special = guess_special( $h2_fold, $mysync->{possible_special}, $mysync->{h2_prefix} ) ;
                if ( $special ) {
                        $mysync->{h2_special_guessed}{$h2_fold} = $special ;
                        my $already_guessed = $mysync->{h2_special_guessed}{$special} ;
                        if ( $already_guessed ) {
                                myprint( "Host2: $h2_fold not $special because set to $already_guessed\n" ) ;
                        }
                        else {
                                $mysync->{h2_special_guessed}{$special} = $h2_fold ;
                        }
                }
        }
        return ;
}

sub guess_special {
        my ( $folder, $possible_special_ref, $prefix ) = @_ ;

        my $folder_no_prefix = $folder ;
        $folder_no_prefix =~ s/\Q${prefix}\E//xms ;

        #$debug and myprint( "folder_no_prefix: $folder_no_prefix\n"  ) ;

        my $guess_special =
             $possible_special_ref->{$folder}
          || $possible_special_ref->{$folder_no_prefix}
          || q{} ;

        return ( $guess_special ) ;
}

sub tests_guess_special {
        note( 'Entering tests_guess_special()' ) ;

        my $possible_special_ref = build_possible_special( my $mysync ) ;
        ok( '\Sent' eq guess_special( 'Sent', $possible_special_ref, q{} ), 'guess_special: Sent => \Sent' ) ;
        ok( q{} eq guess_special( 'Blabla', $possible_special_ref, q{} ), 'guess_special: Blabla => q{}' ) ;
        ok( '\Sent' eq guess_special( 'INBOX.Sent',  $possible_special_ref, 'INBOX.' ),  'guess_special: INBOX.Sent => \Sent' ) ;
        ok( '\Sent' eq guess_special( 'IN BOX.Sent', $possible_special_ref, 'IN BOX.' ), 'guess_special: IN BOX.Sent => \Sent' ) ;

        note( 'Leaving  tests_guess_special()' ) ;
        return ;
}

sub build_automap {
        my $mysync = shift ;
        $debug and myprint( "Entering build_automap\n" ) ;
        foreach my $h1_fold ( @{ $mysync->{h1_folders_wanted} } ) {
                my $h2_fold ;
                my $h1_special         = $mysync->{h1_special}{$h1_fold} ;
                my $h1_special_guessed = $mysync->{h1_special_guessed}{$h1_fold} ;

                # Case 1: special on both sides.
                if ( $h1_special
                        and exists $mysync->{h2_special}{$h1_special} )
                {
                        $h2_fold = $mysync->{h2_special}{$h1_special} ;
                        $mysync->{f1f2auto}{$h1_fold} = $h2_fold ;
                        next ;
                }

                # Case 2: special on host1, not on host2
                if (        $h1_special
                        and ( not exists $mysync->{h2_special}{$h1_special} )
                        and ( exists $mysync->{h2_special_guessed}{$h1_special} ) )
                {
                        # special_guessed on host2
                        $h2_fold = $mysync->{h2_special_guessed}{$h1_special} ;
                        $mysync->{f1f2auto}{$h1_fold} = $h2_fold ;
                        next ;
                }

                # Case 3: no special on host1, special on host2
                if (        ( not $h1_special )
                        and ( $h1_special_guessed )
                        and ( exists $mysync->{h2_special}{$h1_special_guessed} ) )
                {
                        $h2_fold = $mysync->{h2_special}{$h1_special_guessed} ;
                        $mysync->{f1f2auto}{$h1_fold} = $h2_fold ;
                        next ;
                }

                # Case 4: no special on both sides.
                if (        ( not $h1_special )
                        and ( $h1_special_guessed )
                        and ( not exists $mysync->{h2_special}{$h1_special_guessed} )
                        and ( exists $mysync->{h2_special_guessed}{$h1_special_guessed} ) )
                {
                        $h2_fold = $mysync->{h2_special_guessed}{$h1_special_guessed} ;
                        $mysync->{f1f2auto}{$h1_fold} = $h2_fold ;
                        next ;
                }
        }
        return ( $mysync->{f1f2auto} ) ;
}

# I will not add what there is at:
# http://stackoverflow.com/questions/2185391/localized-gmail-imap-folders/2185548#2185548
# because it works well without
sub build_possible_special {
        my $mysync           = shift ;
        my $possible_special = {} ;

        # All|Archive|Drafts|Flagged|Junk|Sent|Trash

        $possible_special->{'\All'}     = [ 'All',     'All Messages',  '&BBIEQQQ1-' ] ;
        $possible_special->{'\Archive'} = [ 'Archive', 'Archives',      '&BBAEQARFBDgEMg-' ] ;
        $possible_special->{'\Drafts'}  = [ 'Drafts',  'DRAFTS',        '&BCcENQRABD0EPgQyBDgEOgQ4-', 'Szkice', 'Wersje robocze' ] ;
        $possible_special->{'\Flagged'} = [ 'Flagged', 'Starred',       '&BB8EPgQ8BDUERwQ1BD0EPQRLBDU-' ] ;
        $possible_special->{'\Junk'}    = [ 'Junk',    'Spam',          'SPAM', '&BCEEPwQwBDw-', 'Potwierdzony spam', 'Wiadomo&AVs-ci-&AVs-mieci' ] ;
        $possible_special->{'\Sent'}    = [ 'Sent',    'Sent Messages', 'Sent Items', 'Gesendete Elemente', 'Gesendete Objekte', '&AMk-l&AOk-ments envoy&AOk-s', 'Envoy&AOk-', 'Objets envoy&AOk-s', 'Elementos enviados', '&kAFP4W4IMH8wojCkMMYw4A-', '&BB4EQgQ,BEAEMAQyBDsENQQ9BD0ESwQ1-', 'Elementy wys&AUI-ane' ] ;
        $possible_special->{'\Trash'}   = [ 'Trash',   'TRASH',         '&BCMENAQwBDsENQQ9BD0ESwQ1-', '&BBoEPgRABDcEOAQ9BDA-', 'Kosz', 'Deleted Items' ] ;

        foreach my $special ( qw( \All \Archive \Drafts \Flagged \Junk \Sent \Trash ) ) {
                foreach my $possible_folder ( @{ $possible_special->{$special} } ) {
                        $possible_special->{$possible_folder} = $special ;
                }
        }
        $mysync->{possible_special} = $possible_special ;
        $debug and myprint( Data::Dumper->Dump( [$possible_special], ['possible_special'] ) ) ;
        return ( $possible_special ) ;
}

sub special_from_folders_hash {
        my ( $imap, $side ) = @_ ;
        my %special = () ;

        if ( !defined $imap ) { return ; }
        $side = defined $side ? $side : 'Host?' ;

        if ( !$imap->can( 'folders_hash' ) ) {
                my $error = "$side: To have automagic rfc6154 folder mapping, upgrade Mail::IMAPClient >= 3.34\n" ;
                errors_incr( $sync, $error ) ;
                return ( \%special ) ;    # empty hash ref
        }
        my $folders_hash = $imap->folders_hash() ;
        foreach my $fhash ( @{$folders_hash} ) {
                my @special = grep { /\\(?:All|Archive|Drafts|Flagged|Junk|Sent|Trash)/x } @{ $fhash->{attrs} } ;
                if ( @special ) {
                        my $special = $special[0] ;    # keep first one. Could be not very good.
                        if ( exists $special{$special} ) {
                                myprintf( "%s: special %-20s = %s already assigned to %s\n", $side, $fhash->{name}, join( q{ }, @special ), $special{$special} ) ;
                        }
                        else {
                                myprintf( "%s: special %-20s = %s\n", $side, $fhash->{name}, join( q{ }, @special ) ) ;
                                $special{$special} = $fhash->{name} ;
                                $special{ $fhash->{name} } = $special ;    # double entry value => key
                        }
                }
        }
        myprint( "\n" ) if ( %special ) ;
        return ( \%special ) ;
}

sub tests_special_from_folders_hash {
        note( 'Entering tests_special_from_folders_hash()' ) ;

        require Test::MockObject ;
        my $imapT = Test::MockObject->new() ;

        is( undef, special_from_folders_hash(), 'special_from_folders_hash: no args' ) ;
        is_deeply( {}, special_from_folders_hash( $imapT ), 'special_from_folders_hash: $imap void' ) ;

        $imapT->mock( 'folders_hash', sub { return ( [ { name => 'Sent', attrs => ['\Sent'] } ] ) } ) ;
        is_deeply( { Sent => '\Sent', '\Sent' => 'Sent' }, special_from_folders_hash( $imapT ), 'special_from_folders_hash: $imap \Sent' ) ;

        note( 'Leaving  tests_special_from_folders_hash()' ) ;
        return () ;
}

sub errors_incr {
        my ( $mysync, @error ) = @ARG ;
        $sync->{nb_errors}++ ;

        if ( @error ) {
                errors_log( $mysync, @error ) ;
                myprint( @error ) ;
        }

        $mysync->{errorsmax} ||= $ERRORS_MAX ;
        if ( $sync->{nb_errors} >= $mysync->{errorsmax} ) {
                myprint( "Maximum number of errors $mysync->{errorsmax} reached ( you can change $mysync->{errorsmax} to any value, for example 100 with --errorsmax 100  ). Exiting.\n" ) ;
                if ( $mysync->{errorsdump} ) {
                        myprint( errorsdump( $sync->{nb_errors}, errors_log( $mysync ) ) ) ;

                        # again since errorsdump(  ) can be very verbose and masquerade previous warning
                        myprint( "Maximum number of errors $mysync->{errorsmax} reached ( you can change $mysync->{errorsmax} to any value, for example 100 with --errorsmax 100 ). Exiting.\n" ) ;
                }
                exit_clean( $mysync, $EXIT_WITH_ERRORS_MAX ) ;
        }
        return ;
}

sub errors_log {
        my ( $mysync, @error ) = @ARG ;

        if ( !$mysync->{errors_log} ) {
                $mysync->{errors_log} = [] ;
        }

        if ( @error ) {
                push @{ $mysync->{errors_log} }, join( q{}, @error ) ;
        }
        if ( @{ $mysync->{errors_log} } ) {
                return @{ $mysync->{errors_log} } ;
        }
        else {
                return ;
        }
}

sub tests_errors_log {
        note( 'Entering tests_errors_log()' ) ;

        note( 'Leaving  tests_errors_log()' ) ;
        return ;
}

sub errorsdump {
        my ( $nb_errors, @errors_log ) = @ARG ;
        my $error_num   = 0 ;
        my $errors_list = q{} ;
        if ( @errors_log ) {
                $errors_list = "++++ Listing $nb_errors errors encountered during the sync ( avoid this listing with --noerrorsdump ).\n" ;
                foreach my $error ( @errors_log ) {
                        $error_num++ ;
                        $errors_list .= "Err $error_num/$nb_errors: $error" ;
                }
        }
        return ( $errors_list ) ;
}

sub tests_live_result {
        note( 'Entering tests_live_result()' ) ;

        my $nb_errors = shift ;
        if ( $nb_errors ) {
                myprint( "Live tests failed with $nb_errors errors\n" ) ;
        }
        else {
                myprint( "Live tests ended successfully\n" ) ;
        }
        note( 'Leaving  tests_live_result()' ) ;
        return ;
}

sub foldersizesatend {
        timenext() ;
        return if ( $imap1->IsUnconnected() ) ;
        return if ( $imap2->IsUnconnected() ) ;

        # Get all folders on host2 again since new were created
        @h2_folders_all = sort $imap2->folders() ;
        for ( @h2_folders_all ) {
                $h2_folders_all{$_} = 1 ;
                $h2_folders_all_UPPER{ uc $_ } = 1 ;
        }
        ( $h1_nb_msg_end, $h1_bytes_end ) = foldersizes( 'Host1', $imap1, $search1, $sync->{abletosearch1}, @h1_folders_wanted ) ;
        ( $h2_nb_msg_end, $h2_bytes_end ) = foldersizes( 'Host2', $imap2, $search2, $sync->{abletosearch2}, @h2_folders_from_1_wanted ) ;
        if ( not all_defined( $h1_nb_msg_end, $h1_bytes_end, $h2_nb_msg_end, $h2_bytes_end ) ) {
                my $error = "Failure getting foldersizes, final differences will not be calculated\n" ;
                errors_incr( $sync, $error ) ;
        }
        return ;
}

sub size_filtered_flag {
        my $h1_size = shift ;

        if ( defined $maxsize and $h1_size >= $maxsize ) {
                return ( 1 ) ;
        }
        if ( defined $minsize and $h1_size <= $minsize ) {
                return ( 1 ) ;
        }
        return ( 0 ) ;
}

sub sync_flags_fir {
        my ( $h1_fold, $h1_msg, $h2_fold, $h2_msg, $permanentflags2, $h1_fir_ref, $h2_fir_ref ) = @_ ;

        if ( not defined $h1_msg ) { return }
        if ( not defined $h2_msg ) { return }

        my $h1_size = $h1_fir_ref->{$h1_msg}->{'RFC822.SIZE'} ;
        return if size_filtered_flag( $h1_size ) ;

        # used cached flag values for efficiency
        my $h1_flags = $h1_fir_ref->{$h1_msg}->{'FLAGS'} || q{} ;
        my $h2_flags = $h2_fir_ref->{$h2_msg}->{'FLAGS'} || q{} ;

        sync_flags( $h1_fold, $h1_msg, $h1_flags, $h2_fold, $h2_msg, $h2_flags, $permanentflags2 ) ;

        return ;
}

sub sync_flags_after_copy {
        my ( $h1_fold, $h1_msg, $h1_flags, $h2_fold, $h2_msg, $permanentflags2 ) = @_ ;

        my @h2_flags = $imap2->flags( $h2_msg ) ;
        my $h2_flags = "@h2_flags" ;
        ( $debug or $debugflags ) and myprint( "Host2 flags before resync by STORE on msg $h2_msg: $h2_flags\n" ) ;
        sync_flags( $h1_fold, $h1_msg, $h1_flags, $h2_fold, $h2_msg, $h2_flags, $permanentflags2 ) ;
        return ;
}

sub sync_flags {
        my ( $h1_fold, $h1_msg, $h1_flags, $h2_fold, $h2_msg, $h2_flags, $permanentflags2 ) = @_ ;

        ( $debug or $debugflags )
          and myprint( "Host1: flags init msg $h1_fold/$h1_msg flags( $h1_flags ) Host2 $h2_fold/$h2_msg flags( $h2_flags )\n" ) ;

        $h1_flags = flags_for_host2( $h1_flags, $permanentflags2 ) ;

        $h2_flags = flagscase( $h2_flags ) ;

        ( $debug or $debugflags )
          and myprint( "Host1 flags filt msg $h1_fold/$h1_msg flags( $h1_flags ) Host2 $h2_fold/$h2_msg flags( $h2_flags )\n" ) ;

        # compare flags - set flags if there a difference
        my @h1_flags = sort split( q{ }, $h1_flags ) ;
        my @h2_flags = sort split( q{ }, $h2_flags ) ;
        my $diff = compare_lists( \@h1_flags, \@h2_flags ) ;

        $diff
          and ( $debug or $debugflags )
          and myprint( "Host2 flags msg $h2_fold/$h2_msg replacing h2 flags( $h2_flags ) with h1 flags( $h1_flags )\n" ) ;

        # This sets flags so flags can be removed with this
        # When you remove a \Seen flag on host1 you want to it
        # to be removed on host2. Just add flags is not what
        # we need most of the time.

        if ( not $sync->{dry} and $diff and not $imap2->store( $h2_msg, "FLAGS.SILENT (@h1_flags)" ) ) {
                my $error_msg = join q{}, "Host2 flags msg $h2_fold/$h2_msg could not add flags [@h1_flags]: ", $imap2->LastError || q{}, "\n" ;
                errors_incr( $sync, $error_msg ) ;
        }

        return ;
}

sub _filter {
        my $str = shift or return q{} ;
        my $sz  = $SIZE_MAX_STR ;
        my $len = length $str ;
        if ( not $debug and $len > $sz * 2 ) {
                my $beg = substr $str, 0, $sz ;
                my $end = substr $str, -$sz, $sz ;
                $str = $beg . '...' . $end ;
        }
        $str =~ s/\012?\015$//x ;
        return "(len=$len) " . $str ;
}

sub lost_connection {
        my ( $imap, $error_message ) = @_ ;
        if ( $imap->IsUnconnected() ) {
                $sync->{nb_errors}++ ;
                my $lcomm = $imap->LastIMAPCommand || q{} ;
                my $einfo = $imap->LastError || @{ $imap->History }[$LAST] || q{} ;

                # if string is long try reduce to a more reasonable size
                $lcomm = _filter( $lcomm ) ;
                $einfo = _filter( $einfo ) ;
                myprint( "Failure: last command: $lcomm\n" ) if ( $debug && $lcomm ) ;
                myprint( "Failure: lost connection $error_message: ", $einfo, "\n" ) ;
                return ( 1 ) ;
        }
        else {
                return ( 0 ) ;
        }
}

sub tests_max {
        note( 'Entering tests_max()' ) ;
        is( 0,          max( 0 ),          'max 0 => 0' ) ;
        is( 1,          max( 1 ),          'max 1 => 1' ) ;
        is( $MINUS_ONE, max( $MINUS_ONE ), 'max -1 => -1' ) ;
        is( undef,      max(),             'max no arg => undef' ) ;
        is( $NUMBER_100, max( 1,           $NUMBER_100 ), 'max 1 100 => 100' ) ;
        is( $NUMBER_100, max( $NUMBER_100, 1 ),           'max 100 1 => 100' ) ;
        is( $NUMBER_100, max( $NUMBER_100, $NUMBER_42,  1 ),          'max 100 42 1 => 100' ) ;
        is( $NUMBER_100, max( $NUMBER_100, '42',        1 ),          'max 100 42 1 => 100' ) ;
        is( $NUMBER_100, max( '100',       '42',        1 ),          'max 100 42 1 => 100' ) ;
        is( $NUMBER_100, max( $NUMBER_100, 'haha',      1 ),          'max 100 haha 1 => 100' ) ;
        is( $NUMBER_100, max( 'bb',        $NUMBER_100, 'haha' ),     'max bb 100 haha => 100' ) ;
        is( $MINUS_ONE,  max( q{},         $MINUS_ONE,  'haha' ),     'max "" -1 haha => -1' ) ;
        is( $MINUS_ONE,  max( q{},         $MINUS_ONE,  $MINUS_TWO ), 'max "" -1 -2 => -1' ) ;
        is( $MINUS_ONE,  max( 'haha',      $MINUS_ONE,  $MINUS_TWO ), 'max haha -1 -2 => -1' ) ;
        is( 1, max( $MINUS_ONE, 1 ), 'max -1 1 => 1' ) ;
        is( 1, max( undef,      1 ), 'max undef 1 => 1' ) ;
        is( 0, max( undef,      0 ), 'max undef 0 => 0' ) ;
        is( 'haha', max( 'haha' ), 'max haha => haha' ) ;
        is( 'bb', max( 'aa', 'bb' ), 'max aa bb => bb' ) ;
        is( 'bb', max( 'bb', 'aa' ), 'max bb aa => bb' ) ;
        is( 'bb', max( 'bb', 'aa', 'bb' ), 'max bb aa bb => bb' ) ;
        note( 'Leaving  tests_max()' ) ;
        return ;
}

sub max {
        my @list = @_ ;
        return ( undef ) if ( 0 == scalar @list ) ;

        my ( @numbers, @notnumbers ) ;
        foreach my $item ( @list ) {
                if ( is_number( $item ) ) {
                        push @numbers, $item ;
                }
                else {
                        push @notnumbers, $item ;
                }
        }

        my @sorted ;
        if ( @numbers ) {
                @sorted = sort { $a <=> $b } @numbers ;
        }
        elsif ( @notnumbers ) {
                @sorted = sort { $a cmp $b } @notnumbers ;
        }
        else {
                return ;
        }

        return ( pop @sorted ) ;
}

sub tests_is_number {
        ok( !is_number(),          'is_number: no args => undef ' ) ;
        ok( is_number( 1 ),        'is_number:  1 => 1' ) ;
        ok( is_number( 1.1 ),      'is_number:  1.1 => 1' ) ;
        ok( is_number( 0 ),        'is_number:  0 => 1' ) ;
        ok( is_number( -1 ),       'is_number: -1 => 1' ) ;
        ok( !is_number( 1.1.1 ),   'is_number: 1.1.1 => no' ) ;
        ok( !is_number( q{} ),     'is_number:   q{} => no' ) ;
        ok( !is_number( 'haha' ),  'is_number:  haha => no' ) ;
        ok( !is_number( '0haha' ), 'is_number: 0haha => no' ) ;
        ok( !is_number( '2haha' ), 'is_number: 2haha => no' ) ;
        ok( !is_number( 'haha2' ), 'is_number: haha2 => no' ) ;
}

sub is_number {
        my $item = shift ;

        if ( !defined $item ) { return ; }

        if ( $item =~ /\A$RE{num}{real}\Z/ ) {
                return 1 ;
        }
        return ;
}

sub tests_min {
        note( 'Entering tests_min()' ) ;

        is( 0,          min( 0 ),          'min 0 => 0' ) ;
        is( 1,          min( 1 ),          'min 1 => 1' ) ;
        is( $MINUS_ONE, min( $MINUS_ONE ), 'min -1 => -1' ) ;
        is( undef,      min(),             'min no arg => undef' ) ;
        is( 1, min( 1,           $NUMBER_100 ), 'min 1 100 => 1' ) ;
        is( 1, min( $NUMBER_100, 1 ),           'min 100 1 => 1' ) ;
        is( 1, min( $NUMBER_100, $NUMBER_42, 1 ), 'min 100 42 1 => 1' ) ;
        is( 1, min( $NUMBER_100, '42',       1 ), 'min 100 42 1 => 1' ) ;
        is( 1, min( '100',       '42',       1 ), 'min 100 42 1 => 1' ) ;
        is( 1, min( $NUMBER_100, 'haha',     1 ), 'min 100 haha 1 => 1' ) ;
        is( $MINUS_ONE, min( $MINUS_ONE, 1 ), 'min -1 1 => -1' ) ;

        is( 1, min( undef, 1 ), 'min undef 1 => 1' ) ;
        is( 0, min( undef, 0 ), 'min undef 0 => 0' ) ;
        is( 1, min( undef, 1 ), 'min undef 1 => 1' ) ;
        is( 0, min( undef, 2, 0, 1 ), 'min undef, 2, 0, 1 => 0' ) ;

        is( 'haha', min( 'haha' ), 'min haha => haha' ) ;
        is( 'aa', min( 'aa', 'bb' ), 'min aa bb => aa' ) ;
        is( 'aa', min( 'bb', 'aa' ), 'min bb aa bb => aa' ) ;
        is( 'aa', min( 'bb', 'aa', 'bb' ), 'min bb aa bb => aa' ) ;

        note( 'Leaving  tests_min()' ) ;
        return ;
}

sub min {
        my @list = @_ ;
        return ( undef ) if ( 0 == scalar @list ) ;

        my ( @numbers, @notnumbers ) ;
        foreach my $item ( @list ) {
                if ( is_number( $item ) ) {
                        push @numbers, $item ;
                }
                else {
                        push @notnumbers, $item ;
                }
        }

        my @sorted ;
        if ( @numbers ) {
                @sorted = sort { $a <=> $b } @numbers ;
        }
        elsif ( @notnumbers ) {
                @sorted = sort { $a cmp $b } @notnumbers ;
        }
        else {
                return ;
        }

        return ( shift @sorted ) ;
}

sub check_lib_version {
        $debug and myprint( "IMAPClient $Mail::IMAPClient::VERSION\n" ) ;
        if ( '2.2.9' eq $Mail::IMAPClient::VERSION ) {
                myprint( "imapsync no longer supports Mail::IMAPClient 2.2.9, upgrade it\n" ) ;
                return 0 ;
        }
        else {
                # 3.x.x is no longer buggy with imapsync.
                # 3.30 or currently superior is imposed in the Perl "use Mail::IMAPClient line".
                return 1 ;
        }
        return ;
}

sub module_version_str {
        my ( $module_name, $module_version ) = @_ ;
        my $str = mysprintf( "%-20s %s\n", $module_name, $module_version ) ;
        return ( $str ) ;
}

sub modulesversion {

        my @list_version ;

        my %modulesversion = (
                'Authen::NTLM'          => sub { $Authen::NTLM::VERSION },
                'Compress::Zlib'        => sub { $Compress::Zlib::VERSION },
                'Crypt::OpenSSL::RSA'   => sub { $Crypt::OpenSSL::RSA::VERSION },
                'Data::Uniqid'          => sub { $Data::Uniqid::VERSION },
                'Digest::HMAC_MD5'      => sub { $Digest::HMAC_MD5::VERSION },
                'Digest::HMAC_SHA1'     => sub { $Digest::HMAC_SHA1::VERSION },
                'Digest::MD5'           => sub { $Digest::MD5::VERSION },
                'File::Copy::Recursive' => sub { $File::Copy::Recursive::VERSION },
                'File::Spec'            => sub { $File::Spec::VERSION },
                'Getopt::Long'          => sub { $Getopt::Long::VERSION },
                'HTML::Entities'        => sub { $HTML::Entities::VERSION },
                'IO::Socket::INET6'     => sub { $IO::Socket::INET6::VERSION },
                'IO::Socket::INET'      => sub { $IO::Socket::INET::VERSION },
                'IO::Socket::SSL'       => sub { $IO::Socket::SSL::VERSION },
                'IO::Socket'            => sub { $IO::Socket::VERSION },
                'IO::Tee'               => sub { $IO::Tee::VERSION },
                'JSON'                  => sub { $JSON::VERSION },
                'JSON::WebToken'        => sub { $JSON::WebToken::VERSION },
                'LWP'                   => sub { $LWP::VERSION },
                'Mail::IMAPClient'      => sub { $Mail::IMAPClient::VERSION },
                'Net::Ping'             => sub { $Net::Ping::VERSION },
                'Net::SSLeay'           => sub { $Net::SSLeay::VERSION },
                'Term::ReadKey'         => sub { $Term::ReadKey::VERSION },
                'Test::MockObject'      => sub { $Test::MockObject::VERSION },
                'Time::HiRes'           => sub { $Time::HiRes::VERSION },
                'Unicode::String'       => sub { $Unicode::String::VERSION },
                'URI::Escape'           => sub { $URI::Escape::VERSION },

                #'Lalala'                => sub { $Lalala::VERSION },
        ) ;

        foreach my $module_name ( sort keys %modulesversion ) {

                # trick from http://www.perlmonks.org/?node_id=152122
                my $file_name = $module_name . '.pm' ;
                $file_name =~ s,::,/,xmgs ;    # Foo::Bar::Baz => Foo/Bar/Baz.pm
                my $v ;
                eval {
                        require $file_name ;
                        $v = defined $modulesversion{$module_name} ? $modulesversion{$module_name}->() : q{?} ;
                } or $v = q{Not installed} ;

                push @list_version, module_version_str( $module_name, $v ) ;
        }

        return ( @list_version ) ;
}

# Construct a command line copy with passwords replaced by MASKED.
sub command_line_nopassword {
        my @argv = @_ ;
        my @argv_nopassword ;

        return ( "@argv" ) if $sync->{showpasswords} ;
        while ( @argv ) {
                my $arg = shift @argv ;    # option name or value
                if ( $arg =~ m/-password[12]/x ) {
                        shift @argv ;      # password value
                        push @argv_nopassword, $arg, 'MASKED' ;    # option name and fake value
                }
                else {
                        push @argv_nopassword, $arg ;              # same option or value
                }
        }
        return ( "@argv_nopassword" ) ;
}

sub tests_command_line_nopassword {
        note( 'Entering tests_command_line_nopassword()' ) ;

        ok( q{} eq command_line_nopassword(),                    'command_line_nopassword void' ) ;
        ok( '--blabla' eq command_line_nopassword( '--blabla' ), 'command_line_nopassword --blabla' ) ;

        #myprint( command_line_nopassword((qw{ --password1 secret1 })), "\n" ) ;
        ok( '--password1 MASKED' eq command_line_nopassword( qw{ --password1 secret1} ),                                      'command_line_nopassword --password1' ) ;
        ok( '--blabla --password1 MASKED --blibli' eq command_line_nopassword( qw{ --blabla --password1 secret1 --blibli } ), 'command_line_nopassword --password1 --blibli' ) ;
        $sync->{showpasswords} = 1 ;
        ok( q{} eq command_line_nopassword(),                    'command_line_nopassword void' ) ;
        ok( '--blabla' eq command_line_nopassword( '--blabla' ), 'command_line_nopassword --blabla' ) ;

        #myprint( command_line_nopassword((qw{ --password1 secret1 })), "\n" ) ;
        ok( '--password1 secret1' eq command_line_nopassword( qw{ --password1 secret1} ),                                      'command_line_nopassword --password1' ) ;
        ok( '--blabla --password1 secret1 --blibli' eq command_line_nopassword( qw{ --blabla --password1 secret1 --blibli } ), 'command_line_nopassword --password1 --blibli' ) ;

        note( 'Leaving  tests_command_line_nopassword()' ) ;
        return ;
}

sub ask_for_password {
        my ( $user, $host ) = @ARG ;
        myprint( "What's the password for $user" . '@' . "$host? (not visible while you type, then enter RETURN) " ) ;
        Term::ReadKey::ReadMode( 2 ) ;
        my $password = <STDIN> ;
        chomp $password ;
        myprint( "\nGot it\n" ) ;
        Term::ReadKey::ReadMode( 0 ) ;
        return $password ;
}

# Have to refactor get_password1() get_password2()
# to have only get_password() and two calls
sub get_password1 {

        my $mysync = shift ;

             $mysync->{password1}
          || $passfile1
          || 'PREAUTH' eq $authmech1
          || 'EXTERNAL' eq $authmech1
          || $ENV{IMAPSYNC_PASSWORD1}
          || do {
                myprint( << 'FIN_PASSFILE' ) ;

If you are afraid of giving password on the command line arguments, you can put the
password of user1 in a file named file1 and use "--passfile1 file1" instead of typing it.
Then give this file restrictive permissions with the command "chmod 600 file1".
An other solution is to set the environment variable IMAPSYNC_PASSWORD1
FIN_PASSFILE

                $mysync->{password1} = ask_for_password( $authuser1 || $mysync->{user1}, $mysync->{host1} ) ;
          } ;

        if ( defined $passfile1 ) {
                if ( !-e -r $passfile1 ) {
                        myprint( "Failure: file from parameter --passfile1 $passfile1 does not exist or is not readable\n" ) ;
                        exit_clean( $mysync, $EX_NOINPUT ) ;
                }

                # passfile1 readable
                $mysync->{password1} = firstline( $passfile1 ) ;
                return ;
        }
        if ( $ENV{IMAPSYNC_PASSWORD1} ) {
                $mysync->{password1} = $ENV{IMAPSYNC_PASSWORD1} ;
                return ;
        }
        return ;
}

sub get_password2 {

        my $mysync = shift ;

             $mysync->{password2}
          || $passfile2
          || 'PREAUTH' eq $authmech2
          || 'EXTERNAL' eq $authmech2
          || $ENV{IMAPSYNC_PASSWORD2}
          || do {
                myprint( << 'FIN_PASSFILE' ) ;

If you are afraid of giving password on the command line arguments, you can put the
password of user2 in a file named file2 and use "--passfile2 file2" instead of typing it.
Then give this file restrictive permissions with the command "chmod 600 file2".
An other solution is to set the environment variable IMAPSYNC_PASSWORD2
FIN_PASSFILE

                $mysync->{password2} = ask_for_password( $authuser2 || $mysync->{user2}, $mysync->{host2} ) ;
          } ;

        if ( defined $passfile2 ) {
                if ( !-e -r $passfile2 ) {
                        myprint( "Failure: file from parameter --passfile2 $passfile2 does not exist or is not readable\n" ) ;
                        exit_clean( $mysync, $EX_NOINPUT ) ;
                }

                # passfile2 readable
                $mysync->{password2} = firstline( $passfile2 ) ;
                return ;
        }
        if ( $ENV{IMAPSYNC_PASSWORD2} ) {
                $mysync->{password2} = $ENV{IMAPSYNC_PASSWORD2} ;
                return ;
        }
        return ;
}

sub catch_ignore {
        my $mysync  = shift ;
        my $signame = shift ;

        my $sigcounter = ++$mysync->{sigcounter}{$signame} ;
        myprint( "\nGot a signal $signame (my PID is $PROCESS_ID). Received $sigcounter $signame signals so far. Thanks!\n" ) ;
        stats( $mysync ) ;
        return ;
}

sub catch_exit {
        my $mysync = shift ;
        my $signame = shift || q{} ;
        if ( $signame ) {
                myprint( "\nGot a signal $signame (my PID is $PROCESS_ID). Asked to terminate\n" ) ;
        }
        myprint( "Here are the final stats of this sync not completely finished so far\n" ) ;
        stats( $mysync ) ;
        myprint( "Ended by a signal $signame (my PID is $PROCESS_ID). I am asked to terminate immediately.\n" ) ;
        myprint( "You should resynchronize those accounts by running a sync again,\n", "since some messages and entire folders might still be missing on host2.\n" ) ;
        exit_clean( $mysync, $EXIT_BY_SIGNAL ) ;
        return ;
}

sub catch_reconnect {
        my $mysync  = shift ;
        my $signame = shift ;
        myprint( "\nGot a signal $signame (my PID is $PROCESS_ID)\n", "Hit 2 ctr-c within 2 seconds to exit the program\n", "Hit only 1 ctr-c to reconnect to both imap servers\n", ) ;
        if ( here_twice( $mysync ) ) {
                myprint( "Got two signals $signame within $INTERVAL_TO_EXIT seconds. Exiting...\n" ) ;
                catch_exit( $mysync ) ;
        }
        else {
                myprint( "For now only one signal $signame within $INTERVAL_TO_EXIT seconds.\n" ) ;
        }

        if ( !defined $mysync->{imap1} ) { return ; }
        if ( !defined $mysync->{imap2} ) { return ; }

        myprint( "Info: reconnecting to host1 imap server\n" ) ;
        $mysync->{imap1}->State( Mail::IMAPClient::Unconnected ) ;
        $mysync->{imap1}->{IMAPSYNC_RECONNECT_COUNT} += 1 ;
        $mysync->{imap1}->reconnect() ;
        myprint( "Info: reconnecting to host2 imap server\n" ) ;
        $mysync->{imap2}->State( Mail::IMAPClient::Unconnected ) ;
        $mysync->{imap2}->{IMAPSYNC_RECONNECT_COUNT} += 1 ;
        $mysync->{imap2}->reconnect() ;
        myprint( "Info: reconnected to both imap servers\n" ) ;
        return ;
}

sub tests_reconnect_12_if_needed {
        note( 'Entering tests_reconnect_12_if_needed()' ) ;

        my $mysync ;

        $mysync->{imap1} = Mail::IMAPClient->new() ;
        $mysync->{imap2} = Mail::IMAPClient->new() ;
        $mysync->{imap1}->Server( 'test1.lamiral.info' ) ;
        $mysync->{imap2}->Server( 'test2.lamiral.info' ) ;
        is( 2, reconnect_12_if_needed( $mysync ),            'reconnect_12_if_needed: test1&test2 .lamiral.info => 1' ) ;
        is( 1, $mysync->{imap1}->{IMAPSYNC_RECONNECT_COUNT}, 'reconnect_12_if_needed: test1.lamiral.info IMAPSYNC_RECONNECT_COUNT => 1' ) ;
        is( 1, $mysync->{imap2}->{IMAPSYNC_RECONNECT_COUNT}, 'reconnect_12_if_needed: test2.lamiral.info IMAPSYNC_RECONNECT_COUNT => 1' ) ;

        note( 'Leaving  tests_reconnect_12_if_needed()' ) ;
        return ;
}

sub reconnect_12_if_needed {
        my $mysync = shift ;

        #return 2 ;
        if ( !reconnect_if_needed( $mysync->{imap1} ) ) {
                return ;
        }
        if ( !reconnect_if_needed( $mysync->{imap2} ) ) {
                return ;
        }

        # both were good
        return 2 ;
}

sub tests_reconnect_if_needed {
        note( 'Entering tests_reconnect_if_needed()' ) ;

        my $myimap ;

        is( undef, reconnect_if_needed(),          'reconnect_if_needed: no args => undef' ) ;
        is( undef, reconnect_if_needed( $myimap ), 'reconnect_if_needed: undef arg => undef' ) ;

        $myimap = Mail::IMAPClient->new() ;
        $myimap->Debug( 1 ) ;
        is( undef, reconnect_if_needed( $myimap ), 'reconnect_if_needed: empty new Mail::IMAPClient => undef' ) ;
        $myimap->Server( 'test.lamiral.info' ) ;
        is( 1, reconnect_if_needed( $myimap ),      'reconnect_if_needed: test.lamiral.info => 1' ) ;
        is( 1, $myimap->{IMAPSYNC_RECONNECT_COUNT}, 'reconnect_if_needed: test.lamiral.info IMAPSYNC_RECONNECT_COUNT => 1' ) ;

        note( 'Leaving  tests_reconnect_if_needed()' ) ;
        return ;
}

sub reconnect_if_needed {

        # return undef upon failure.
        # return 1 upon connection success, with or without reconnection.

        my $imap = shift ;

        if ( !defined $imap )   { return ; }
        if ( !$imap->Server() ) { return ; }

        if ( $imap->IsUnconnected() ) {
                $imap->{IMAPSYNC_RECONNECT_COUNT} += 1 ;
                if ( $imap->reconnect() ) {
                        return 1 ;
                }
        }
        else {
                return 1 ;
        }

        # A last forced one
        $imap->State( Mail::IMAPClient::Unconnected ) ;
        $imap->reconnect() ;
        $imap->{IMAPSYNC_RECONNECT_COUNT} += 1 ;
        if ( $imap->noop ) {

                # NOOP is ok
                return 1 ;
        }

        return ;
}

sub here_twice {
        my $mysync   = shift ;
        my $now      = time ;
        my $previous = $mysync->{lastcatch} || 0 ;
        $mysync->{lastcatch} = $now ;

        if ( $INTERVAL_TO_EXIT >= $now - $previous ) {
                return $TRUE ;
        }
        else {
                return $FALSE ;
        }
}

sub justconnect {

        $imap1 = connect_imap( $sync->{host1}, $sync->{port1}, $debugimap1, $sync->{ssl1}, $sync->{tls1}, 'Host1', $sync->{h1}->{timeout}, $sync->{h1} ) ;
        $imap2 = connect_imap( $sync->{host2}, $sync->{port2}, $debugimap2, $sync->{ssl2}, $sync->{tls2}, 'Host2', $sync->{h2}->{timeout}, $sync->{h2} ) ;
        $imap1->logout() ;
        $imap2->logout() ;
        return ;
}

sub tests_mailimapclient_connect {
        note( 'Entering tests_mailimapclient_connect()' ) ;
        my $imap ;

        # ipv4
        ok( $imap = Mail::IMAPClient->new(), 'mailimapclient_connect ipv4: new' ) ;
        is( 'Mail::IMAPClient', ref( $imap ), 'mailimapclient_connect ipv4: ref is Mail::IMAPClient' ) ;
      SKIP: {

                if ( 'macosx' eq hostname() ) { skip( 'Tests avoided on macosx get stuck', 1 ) ; }
                is( undef, $imap->connect(), 'mailimapclient_connect ipv4: connect with no server => failure' ) ;
        }

        is( 'test.lamiral.info', $imap->Server( 'test.lamiral.info' ), 'mailimapclient_connect ipv4: setting Server(test.lamiral.info)' ) ;
        is( 1,                   $imap->Debug( 1 ),                    'mailimapclient_connect ipv4: setting Debug( 1 )' ) ;
        is( 143,                 $imap->Port( 143 ),                   'mailimapclient_connect ipv4: setting Port( 143 )' ) ;
        is( 3,                   $imap->Timeout( 3 ),                  'mailimapclient_connect ipv4: setting Timout( 30 )' ) ;
        like( ref( $imap->connect() ), qr/IO::Socket::INET/, 'mailimapclient_connect ipv4: connect to test.lamiral.info' ) ;
        like( $imap->logout(),         qr/Mail::IMAPClient/, 'mailimapclient_connect ipv4: logout' ) ;
        is( undef, undef $imap, 'mailimapclient_connect ipv4: free variable' ) ;

        # ipv4 + ssl
        ok( $imap = Mail::IMAPClient->new(), 'mailimapclient_connect ipv4 + ssl: new' ) ;
        is( 'test.lamiral.info', $imap->Server( 'test.lamiral.info' ), 'mailimapclient_connect ipv4 + ssl: setting Server(test.lamiral.info)' ) ;
        is( 1, $imap->Debug( 1 ), 'mailimapclient_connect ipv4 + ssl: setting Debug( 1 )' ) ;
        ok( $imap->Ssl( [ SSL_verify_mode => SSL_VERIFY_NONE ] ), 'mailimapclient_connect ipv4 + ssl: setting Ssl( SSL_VERIFY_NONE )' ) ;
        is( 993, $imap->Port( 993 ), 'mailimapclient_connect ipv4 + ssl: setting Port( 993 )' ) ;
        like( ref( $imap->connect() ), qr/IO::Socket::SSL/, 'mailimapclient_connect ipv4 + ssl: connect to test.lamiral.info' ) ;
        is( $imap->logout(), undef,       'mailimapclient_connect ipv4 + ssl: logout in ssl causes failure' ) ;
        is( undef,           undef $imap, 'mailimapclient_connect ipv4 + ssl: free variable' ) ;

        # ipv6 + ssl
        ok( $imap = Mail::IMAPClient->new(), 'mailimapclient_connect ipv6 + ssl: new' ) ;
        is( 'ks2ipv6.lamiral.info', $imap->Server( 'ks2ipv6.lamiral.info' ), 'mailimapclient_connect ipv6 + ssl: setting Server(ks2ipv6.lamiral.info)' ) ;
        ok( $imap->Ssl( [ SSL_verify_mode => SSL_VERIFY_NONE ] ), 'mailimapclient_connect ipv6 + ssl: setting Ssl( SSL_VERIFY_NONE )' ) ;
        is( 993, $imap->Port( 993 ), 'mailimapclient_connect ipv6 + ssl: setting Port( 993 )' ) ;
      SKIP: {
                if ( 'CUILLERE' eq hostname() ) { skip( 'Tests avoided on CUILLERE can not do ipv6', 2 ) ; }
                like( ref( $imap->connect() ), qr/IO::Socket::SSL/, 'mailimapclient_connect ipv6 + ssl: connect to ks2ipv6.lamiral.info' ) ;
                is( $imap->logout(), undef, 'mailimapclient_connect ipv6 + ssl: logout in ssl causes failure' ) ;
        }
        is( undef, undef $imap, 'mailimapclient_connect ipv6 + ssl: free variable' ) ;

        note( 'Leaving  tests_mailimapclient_connect()' ) ;
        return ;
}

sub tests_mailimapclient_connect_bug {
        note( 'Entering tests_mailimapclient_connect_bug()' ) ;
        my $imap ;

        # ipv6
        ok( $imap = Mail::IMAPClient->new(), 'mailimapclient_connect ipv6: new' ) ;
        is( 'ks2ipv6.lamiral.info', $imap->Server( 'ks2ipv6.lamiral.info' ), 'mailimapclient_connect ipv6: setting Server(ks2ipv6.lamiral.info)' ) ;
        is( 143, $imap->Port( 143 ), 'mailimapclient_connect ipv6: setting Port( 993 )' ) ;

      SKIP: {
                if ( 'CUILLERE' eq hostname() ) { skip( 'Tests avoided on CUILLERE can not do ipv6', 1 ) ; }
                like( ref( $imap->connect() ), qr/IO::Socket::INET/, 'mailimapclient_connect ipv6: connect to ks2ipv6.lamiral.info' )
                  or diag( 'mailimapclient_connect ipv6: ', $imap->LastError(), $!, ) ;
        }

        #is( $imap->logout( ), undef, 'mailimapclient_connect ipv6: logout in ssl causes failure' ) ;
        is( undef, undef $imap, 'mailimapclient_connect ipv6: free variable' ) ;

        note( 'Leaving  tests_mailimapclient_connect_bug()' ) ;
        return ;
}

sub mailimapclient_connect {

        return ;
}

sub tests_connect_socket {
        note( 'Entering tests_connect_socket()' ) ;

        is( undef, connect_socket(), 'connect_socket: no args' ) ;

        my $socket ;
        my $imap ;
      SKIP: {
                if ( 'CUILLERE' eq hostname() ) { skip( 'Tests avoided on CUILLERE cannot do ipv6', 2 ) ; }

                $socket = IO::Socket::INET6->new(
                        PeerAddr => 'ks2ipv6.lamiral.info',
                        PeerPort => 143,
                ) ;

                ok( $imap = connect_socket( $socket ), 'connect_socket: ks2ipv6.lamiral.info port 143 IO::Socket::INET6' ) ;

                #$imap->Debug( 1 ) ;
                # myprint( $imap->capability(  ) ) ;
                if ( $imap ) {
                        $imap->logout() ;
                }

                #$IO::Socket::SSL::DEBUG = 4 ;
                $socket = IO::Socket::SSL->new(
                        PeerHost        => 'ks2ipv6.lamiral.info',
                        PeerPort        => 993,
                        SSL_verify_mode => SSL_VERIFY_NONE,
                ) ;

                # myprint $socket ;
                ok( $imap = connect_socket( $socket ), 'connect_socket: ks2ipv6.lamiral.info port 993 IO::Socket::SSL' ) ;

                #$imap->Debug( 1 ) ;
                # myprint $imap->capability(  ) ;
                $socket->close() ;
                if ( $imap ) {
                        $socket->close() ;
                }

                #$socket->close(SSL_no_shutdown => 1) ;
                #$imap->logout(  ) ;
                #myprint "\n" ;
                #$imap->logout(  ) ;
        }

        note( 'Leaving  tests_connect_socket()' ) ;
        return ;
}

sub connect_socket {
        my ( $socket ) = @ARG ;

        if ( !defined $socket ) { return ; }

        my $host = $socket->peerhost() ;
        my $port = $socket->peerport() ;

        #print "socket->peerhost: ", $socket->peerhost(  ), "\n" ;
        #print "socket->peerport: ", $socket->peerport(  ), "\n" ;
        my $imap = Mail::IMAPClient->new() ;
        $imap->Socket( $socket ) ;
        my $banner = $imap->Results()->[0] ;

        #myprint( "banner: $banner"  ) ;
        return $imap ;
}

sub tests_probe_imapssl {
        note( 'Entering tests_probe_imapssl()' ) ;

        is( undef, probe_imapssl(),            'probe_imapssl: no args => undef' ) ;
        is( undef, probe_imapssl( 'unknown' ), 'probe_imapssl: unknown => undef' ) ;

      SKIP: {
                if ( 'CUILLERE' eq hostname() ) { skip( 'Tests avoided on CUILLERE cannot do ipv6', 1 ) ; }
                like( probe_imapssl( 'ks2ipv6.lamiral.info' ), qr/^\* OK/, 'probe_imapssl: ks2ipv6.lamiral.info matches "* OK"' ) ;
        }

        like( probe_imapssl( 'test1.lamiral.info' ), qr/^\* OK/, 'probe_imapssl: test1.lamiral.info matches "* OK"' ) ;
        like( probe_imapssl( 'imap.gmail.com' ),     qr/^\* OK/, 'probe_imapssl: imap.gmail.com matches "* OK"' ) ;

        note( 'Leaving  tests_probe_imapssl()' ) ;
        return ;
}

sub probe_imapssl {
        my $host = shift ;

        if ( !$host ) { return ; }

        my $socket = IO::Socket::SSL->new(
                PeerHost        => $host,
                PeerPort        => $IMAP_SSL_PORT,
                SSL_verify_mode => SSL_VERIFY_NONE,
        ) ;

        #print "$socket\n" ;
        if ( !$socket ) { return ; }

        my $banner ;
        $socket->sysread( $banner, 65_536 ) ;

        #print "$banner" ;
        $socket->close() ;
        return $banner ;

}

sub connect_imap {
        my ( $host, $port, $mydebugimap, $ssl, $tls, $Side, $mytimeout, $h ) = @_ ;
        my $imap = Mail::IMAPClient->new() ;
        if ( $ssl ) { set_ssl( $imap, $h ) }
        $imap->Server( $host ) ;
        $imap->Port( $port ) ;
        $imap->Debug( $mydebugimap ) ;
        $imap->Timeout( $mytimeout ) ;

        my $side = lc $Side ;
        myprint( "$Side: connecting on $side [$host] port [$port]\n" ) ;

        $imap->connect()
          or die_clean( "$Side: Can not open imap connection on [$host]: " . $imap->LastError . " $OS_ERROR\n" ) ;
        myprint( "$Side IP address: ", $imap->Socket->peerhost(), "\n" ) ;
        my $banner = $imap->Results()->[0] ;

        myprint( "$Side banner: $banner" ) ;
        myprint( "$Side capability: ", join( q{ }, @{ $imap->capability() || [] } ), "\n" ) ;

        if ( $tls ) {
                set_tls( $imap, $h ) ;
                $imap->starttls()
                  or die_clean( "$Side: Can not go to tls encryption on $side [$host]:", $imap->LastError, "\n" ) ;
                myprint( "$Side: Socket successfuly converted to SSL\n" ) ;
        }
        return ( $imap ) ;
}

sub login_imap {

        my @allargs = @_ ;
        my ( $host, $port, $user, $domain, $password, $mydebugimap, $mytimeout, $fastio, $ssl, $tls, $authmech, $authuser, $reconnectretry, $proxyauth, $uid, $split, $Side, $h, $mysync ) = @allargs ;

        my $side = lc $Side ;
        myprint( "$Side: connecting and login on $side [$host] port [$port] with user [$user]\n" ) ;

        my $imap = init_imap( @allargs ) ;

        $imap->connect()
          or die_clean( "$Side failure: can not open imap connection on $side [$host] with user [$user]: " . $imap->LastError . " $OS_ERROR\n" ) ;
        myprint( "$Side IP address: ", $imap->Socket->peerhost(), "\n" ) ;
        my $banner = $imap->Results()->[0] ;

        myprint( "$Side banner: $banner" ) ;
        myprint( "$Side capability before authentication: ", join( q{ }, @{ $imap->capability() || [] } ), "\n" ) ;

        if ( ( !$ssl ) and ( !defined $tls ) and $imap->has_capability( 'STARTTLS' ) ) {
                myprint( "$Side: going to ssl because STARTTLS is in CAPABILITY. Use --notls1 or --notls2 to avoid that behavior\n" ) ;
                $tls = 1 ;
        }

        if ( $authmech eq 'PREAUTH' ) {
                if ( $imap->IsAuthenticated() ) {
                        $imap->Socket ;
                        myprintf( "%s: Assuming PREAUTH for %s\n", $Side, $imap->Server ) ;
                }
                else {
                        die_clean( "$Side failure: error login on $side [$host] with user [$user] auth [PREAUTH]" ) ;
                }
        }

        if ( $tls ) {
                set_tls( $imap, $h ) ;
                $imap->starttls()
                  or die_clean( "$Side failure: Can not go to tls encryption on $side [$host]:", $imap->LastError, "\n" ) ;
                myprint( "$Side: Socket successfuly converted to SSL\n" ) ;
        }

        authenticate_imap( $imap, @allargs ) ;

        myprint( "$Side: success login on [$host] with user [$user] auth [$authmech]\n" ) ;
        return ( $imap ) ;
}

sub authenticate_imap {

        my ( $imap, $host, $port, $user, $domain, $password, $mydebugimap, $mytimeout, $fastio, $ssl, $tls, $authmech, $authuser, $reconnectretry, $proxyauth, $uid, $split, $Side, $h, $mysync ) = @_ ;

        check_capability( $imap, $authmech, $Side ) ;

        if ( $proxyauth ) {
                $imap->Authmechanism( q{} ) ;
                $imap->User( $authuser ) ;
        }
        else {
                $imap->Authmechanism( $authmech ) unless ( $authmech eq 'LOGIN' or $authmech eq 'PREAUTH' ) ;
                $imap->User( $user ) ;
        }

        $imap->Authcallback( \&xoauth )    if ( 'XOAUTH' eq $authmech ) ;
        $imap->Authcallback( \&xoauth2 )   if ( 'XOAUTH2' eq $authmech ) ;
        $imap->Authcallback( \&plainauth ) if ( ( 'PLAIN' eq $authmech ) or ( 'EXTERNAL' eq $authmech ) ) ;

        $imap->Domain( $domain ) if ( defined $domain ) ;
        $imap->Authuser( $authuser ) ;
        $imap->Password( $password ) ;

        unless ( $authmech eq 'PREAUTH' or $imap->login() ) {
                my $info = "$Side failure: Error login on [$host] with user [$user] auth" ;
                my $einfo = $imap->LastError || @{ $imap->History }[$LAST] ;
                chomp $einfo ;
                my $error = "$info [$authmech]: $einfo\n" ;
                if ( $authmech eq 'LOGIN' or $imap->IsUnconnected() or $authuser ) {
                        die_clean( $error ) ;
                }
                else {
                        myprint( $error ) ;
                }
                myprint( "$Side info: trying LOGIN Auth mechanism on [$host] with user [$user]\n" ) ;
                $imap->Authmechanism( q{} ) ;
                $imap->login()
                  or die_clean( "$info [LOGIN]: ", $imap->LastError, "\n" ) ;
        }

        if ( $proxyauth ) {
                if ( !$imap->proxyauth( $user ) ) {
                        my $info = "$Side failure: Error doing proxyauth as user [$user] on [$host] using proxy-login as [$authuser]" ;
                        my $einfo = $imap->LastError || @{ $imap->History }[$LAST] ;
                        chomp $einfo ;
                        die_clean( "$info: $einfo\n" ) ;
                }
        }

        return ;
}

sub check_capability {

        my ( $imap, $authmech, $Side ) = @_ ;

        if (       $imap->has_capability( "AUTH=$authmech" )
                or $imap->has_capability( $authmech ) )
        {
                myprintf( "%s: %s says it has CAPABILITY for AUTHENTICATE %s\n", $Side, $imap->Server, $authmech ) ;
                return ;
        }

        if ( $authmech eq 'LOGIN' ) {

                # Well, the warning is so common and useless that I prefer to remove it
                # No more "... says it has NO CAPABILITY for AUTHENTICATE LOGIN"
                return ;
        }

        myprintf( "%s: %s says it has NO CAPABILITY for AUTHENTICATE %s\n", $Side, $imap->Server, $authmech ) ;

        if ( $authmech eq 'PLAIN' ) {
                myprint( "$Side: frequently PLAIN is only supported with SSL, try --ssl or --tls options\n" ) ;
        }

        return ;
}

sub set_ssl {
        my ( $imap, $h ) = @_ ;

        # SSL_version can be
        #    SSLv3 SSLv2 SSLv23 SSLv23:!SSLv2 (last one is the default in IO-Socket-SSL-1.953)
        #

        my $sslargs_hash = $h->{sslargs} ;

        my $sslargs_default = {
                SSL_verify_mode     => $SSL_VERIFY_POLICY,
                SSL_verifycn_scheme => 'imap',
                SSL_cipher_list     => 'DEFAULT:!DH',
        } ;

        # initiate with default values
        my %sslargs_mix = %{$sslargs_default} ;

        # now override with passed values
        @sslargs_mix{ keys %{$sslargs_hash} } = values %{$sslargs_hash} ;

        # remove keys with undef values
        foreach my $key ( keys %sslargs_mix ) {
                delete $sslargs_mix{$key} if ( not defined $sslargs_mix{$key} ) ;
        }

        # back to an ARRAY
        my @sslargs_mix = %sslargs_mix ;

        #myprint( Data::Dumper->Dump( [ $sslargs_hash, $sslargs_default, \%sslargs_mix, \@sslargs_mix ] )  ) ;
        $imap->Ssl( \@sslargs_mix ) ;
        return ;
}

sub set_tls {
        my ( $imap, $h ) = @_ ;

        my $sslargs_hash = $h->{sslargs} ;

        my $sslargs_default = {
                SSL_verify_mode => $SSL_VERIFY_POLICY,
                SSL_cipher_list => 'DEFAULT:!DH',
        } ;

        # initiate with default values
        my %sslargs_mix = %{$sslargs_default} ;

        # now override with passed values
        @sslargs_mix{ keys %{$sslargs_hash} } = values %{$sslargs_hash} ;

        # remove keys with undef values
        foreach my $key ( keys %sslargs_mix ) {
                delete $sslargs_mix{$key} if ( not defined $sslargs_mix{$key} ) ;
        }

        # back to an ARRAY
        my @sslargs_mix = %sslargs_mix ;

        $imap->Starttls( \@sslargs_mix ) ;
        return ;
}

sub init_imap {
        my ( $host, $port, $user, $domain, $password, $mydebugimap, $mytimeout, $fastio, $ssl, $tls, $authmech, $authuser, $reconnectretry, $proxyauth, $uid, $split, $Side, $h, $mysync ) = @_ ;

        my ( $imap ) ;

        $imap = Mail::IMAPClient->new() ;

        if ( $ssl ) { set_ssl( $imap, $h ) }
        if ( $tls ) { }    # can not do set_tls() here because connect() will directly do a STARTTLS
        $imap->Clear( 1 ) ;
        $imap->Server( $host ) ;
        $imap->Port( $port ) ;
        $imap->Fast_io( $fastio ) ;
        $imap->Buffer( $buffersize || $DEFAULT_BUFFER_SIZE ) ;
        $imap->Uid( $uid ) ;

        $imap->Peek( 1 ) ;
        $imap->Debug( $mydebugimap ) ;
        if ( $mysync->{showpasswords} ) {
                $imap->Showcredentials( 1 ) ;
        }
        defined $mytimeout and $imap->Timeout( $mytimeout ) ;

        $imap->Reconnectretry( $reconnectretry ) if ( $reconnectretry ) ;
        $imap->{IMAPSYNC_RECONNECT_COUNT} = 0 ;
        $imap->Ignoresizeerrors( $allowsizemismatch ) ;
        $split and $imap->Maxcommandlength( $SPLIT_FACTOR * $split ) ;

        return ( $imap ) ;

}

sub plainauth {
        my $code = shift ;
        my $imap = shift ;

        my $string = mysprintf( "%s\x00%s\x00%s", $imap->User, $imap->Authuser, $imap->Password ) ;
        return encode_base64( "$string", q{} ) ;
}

# Copy from https://github.com/imapsync/imapsync/pull/25/files
# Changes "use" pragmas to "require".
# The openssl system call shall be replaced by pure Perl and
# https://metacpan.org/pod/Crypt::OpenSSL::PKCS12

# Now the Joaquin Lopez code:
#
# Used this as an example: https://gist.github.com/gsainio/6322375
#
# And this as a reference: https://developers.google.com/accounts/docs/OAuth2ServiceAccount
# (note there is an http/rest tab, where the real info is hidden away... went on a witch hunt
# until I noticed that...)
#
# This is targeted at gmail to maintain compatibility after google's oauth1 service is deactivated
# on May 5th, 2015: https://developers.google.com/gmail/oauth_protocol
# If there are other oauth2 implementations out there, this would need to be modified to be
# compatible
#
# This is a good guide on setting up the google api/apps side of the equation:
# http://www.limilabs.com/blog/oauth2-gmail-imap-service-account
#
# 2016/05/27: Updated to support oauth/key data in the .json files Google now defaults to
# when creating gmail service accounts. They're easier to work with since they neither
# requiring decrypting nor specifying the oauth2 client id separately.
#
# If the password arg ends in .json, it will assume this new json method, otherwise it
# will fallback to the "oauth client id;.p12" format it was previously using.
sub xoauth2 {
        require JSON::WebToken ;
        require LWP::UserAgent ;
        require HTML::Entities ;
        require JSON ;
        require JSON::WebToken::Crypt::RSA ;
        require Crypt::OpenSSL::RSA ;
        require Encode::Byte ;
        require IO::Socket::SSL ;

        my $code = shift ;
        my $imap = shift ;

        my ( $iss, $key ) ;

        if ( $imap->Password =~ /^(.*\.json)$/x ) {
                my $json     = JSON->new() ;
                my $filename = $1 ;
                $debug and myprint( "XOAUTH2 json file: $filename\n" ) ;
                open( my $FILE, '<', $filename ) or die_clean( "error [$filename]: $OS_ERROR " ) ;
                my $jsonfile = $json->decode( join q{}, <$FILE> ) ;
                close $FILE ;

                $iss = $jsonfile->{client_id} ;
                $key = $jsonfile->{private_key} ;
                $debug and myprint( "Service account: $iss\n" ) ;
                $debug and myprint( "Private key:\n$key\n" ) ;
        }
        else {
                # Get iss (service account address), keyfile name, and keypassword if necessary
                ( $iss, my $keyfile, my $keypass ) = $imap->Password =~ /([\-\d\w\@\.]+);([a-zA-Z0-9 \_\-\.\/]+);?(.*)?/x ;

                # Assume key password is google default if not provided
                $keypass = 'notasecret' if not $keypass ;

                $debug and myprint( "Service account: $iss\nKey file: $keyfile\nKey password: $keypass\n" ) ;

                # Get private key from p12 file (would be better in perl...)
                $key = `openssl pkcs12 -in "$keyfile" -nodes -nocerts -passin pass:$keypass -nomacver` ;

                $debug and myprint( "Private key:\n$key\n" ) ;
        }

        # Create jwt of oauth2 request
        my $time = time ;
        my $jwt  = JSON::WebToken->encode(
                {
                        'iss'   => $iss,                                           # service account
                        'scope' => 'https://mail.google.com/',
                        'aud'   => 'https://www.googleapis.com/oauth2/v3/token',
                        'exp'   => $time + $DEFAULT_EXPIRATION_TIME_OAUTH2_PK12,
                        'iat'   => $time,
                        'prn'   => $imap->User                                     # user to auth as
                },
                $key,
                'RS256',
                { 'typ' => 'JWT' }
        ) ;                                                                        # Crypt::OpenSSL::RSA needed here.

        # Post oauth2 request
        my $ua = LWP::UserAgent->new() ;
        $ua->env_proxy() ;

        my $response = $ua->post(
                'https://www.googleapis.com/oauth2/v3/token',
                {
                        grant_type => HTML::Entities::encode_entities( 'urn:ietf:params:oauth:grant-type:jwt-bearer' ),
                        assertion  => $jwt
                }
        ) ;

        unless ( $response->is_success() ) {
                die_clean( $response->code, "\n", $response->content, "\n" ) ;
        }
        else {
                $debug and myprint( $response->content ) ;
        }

        # access_token in response is what we need
        my $data = JSON::decode_json( $response->content ) ;

        # format as oauth2 auth data
        my $xoauth2_string = encode_base64( 'user=' . $imap->User . "\1auth=Bearer " . $data->{access_token} . "\1\1", q{} ) ;

        $debug and myprint( "XOAUTH2 String: $xoauth2_string\n" ) ;
        return ( $xoauth2_string ) ;
}

# xoauth() thanks to Eduardo Bortoluzzi Junior
sub xoauth {
        require URI::Escape ;
        require Data::Uniqid ;

        my $code = shift ;
        my $imap = shift ;

        # The base information needed to construct the OAUTH authentication
        my $method  = 'GET' ;
        my $url     = mysprintf( 'https://mail.google.com/mail/b/%s/imap/', $imap->User ) ;
        my $urlparm = mysprintf( 'xoauth_requestor_id=%s', URI::Escape::uri_escape( $imap->User ) ) ;

        # For Google Apps, the consumer key is the primary domain
        # TODO: create a command line argument to define the consumer key
        my @user_parts = split /@/x, $imap->User ;
        $debug and myprint( "XOAUTH: consumer key: $user_parts[1]\n" ) ;

        # All the parameters needed to be signed on the XOAUTH
        my %hash = () ;
        $hash{'xoauth_requestor_id'}    = URI::Escape::uri_escape( $imap->User ) ;
        $hash{'oauth_consumer_key'}     = $user_parts[1] ;
        $hash{'oauth_nonce'}            = md5_hex( Data::Uniqid::uniqid( rand(), 1 == 1 ) ) ;
        $hash{'oauth_signature_method'} = 'HMAC-SHA1' ;
        $hash{'oauth_timestamp'}        = time ;
        $hash{'oauth_version'}          = '1.0' ;

        # Base will hold the string to be signed
        my $base = "$method&" . URI::Escape::uri_escape( $url ) . q{&} ;

        # The parameters must be in dictionary order before signing
        my $baseparms = q{} ;
        foreach my $key ( sort keys %hash ) {
                if ( length( $baseparms ) > 0 ) {
                        $baseparms .= q{&} ;
                }

                $baseparms .= "$key=$hash{$key}" ;
        }

        $base .= URI::Escape::uri_escape( $baseparms ) ;
        $debug and myprint( "XOAUTH: base request to sign: $base\n" ) ;

        # Sign it with the consumer secret, informed on the command line (password)
        my $digest = hmac_sha1( $base, URI::Escape::uri_escape( $imap->Password ) . q{&} ) ;

        # The parameters signed become a parameter and...
        $hash{'oauth_signature'} = URI::Escape::uri_escape( substr encode_base64( $digest ), 0, $MINUS_ONE ) ;

        # ... we don't need the requestor_id anymore.
        delete $hash{'xoauth_requestor_id'} ;

        # Create the final authentication string
        my $string = $method . q{ } . $url . q{?} . $urlparm . q{ } ;

        # All the parameters must be sorted
        $baseparms = q{} ;
        foreach my $key ( sort keys %hash ) {
                if ( length( $baseparms ) > 0 ) {
                        $baseparms .= q{,} ;
                }

                $baseparms .= "$key=\"$hash{$key}\"" ;
        }

        $string .= $baseparms ;

        $debug and myprint( "XOAUTH: authentication string: $string\n" ) ;

        # It must be base64 encoded
        return encode_base64( "$string", q{} ) ;
}

sub banner_imapsync {

        my @argv = @_ ;

        my $banner_imapsync = join q{}, q{$RCSfile: imapsync,v $ }, q{$Revision: 1.870 $ }, q{$Date: 2018/04/08 17:25:54 $ }, "\n", "Command line used:\n", "$PROGRAM_NAME ", command_line_nopassword( @argv ), "\n" ;

        return ( $banner_imapsync ) ;
}

sub do_valid_directory {
        my $dir = shift ;

        # all good => return ok.
        return ( 1 ) if ( -d $dir and -r _ and -w _ ) ;

        # exist but bad
        if ( -e $dir and not -d _ ) {
                myprint( "Error: $dir exists but is not a directory\n" ) ;
                return ( 0 ) ;
        }
        if ( -e $dir and not -w _ ) {
                my $sb = stat $dir ;
                myprintf( "Error: directory %s is not writable for user %s, permissions are %04o and owner is %s ( uid %s )\n", $dir, getpwuid_any_os( $EFFECTIVE_USER_ID ), ( $sb->mode & oct( $PERMISSION_FILTER ) ), getpwuid_any_os( $sb->uid ), $sb->uid() ) ;
                return ( 0 ) ;
        }

        # Trying to create it
        myprint( "Creating directory $dir\n" ) ;
        if ( !eval { mkpath( $dir ) } ) {
                myprint( "$EVAL_ERROR" ) if ( $EVAL_ERROR ) ;
        }
        return ( 1 ) if ( -d $dir and -r _ and -w _ ) ;
        return ( 0 ) ;
}

sub tests_do_valid_directory {
        note( 'Entering tests_do_valid_directory()' ) ;

        Readonly my $NB_UNIX_tests_do_valid_directory => 4 ;
      SKIP: {
                skip( 'Tests only for Unix', $NB_UNIX_tests_do_valid_directory ) if ( 'MSWin32' eq $OSNAME ) ;
                ok( 1 == do_valid_directory( '.' ),                       'do_valid_directory: . good' ) ;
                ok( 1 == do_valid_directory( './W/tmp/tests/valid/sub' ), 'do_valid_directory: ./W/tmp/tests/valid/sub good' ) ;
                diag( 'Error / not writable is on purpose' ) ;
                ok( 0 == do_valid_directory( '/' ), 'do_valid_directory: / bad' ) ;
                diag( 'Error permission denied on /noway is on purpose' ) ;
                ok( 0 == do_valid_directory( '/noway' ), 'do_valid_directory: /noway bad' ) ;
        }
        note( 'Leaving  tests_do_valid_directory()' ) ;
        return ;
}

sub tests_match_a_pid_number {
        is( undef, match_a_pid_number(),           'match_a_pid_number: no args => undef' ) ;
        is( undef, match_a_pid_number( '' ),       'match_a_pid_number: "" => undef' ) ;
        is( undef, match_a_pid_number( 'lalala' ), 'match_a_pid_number: lalala => undef' ) ;
        is( 1,     match_a_pid_number( 1 ),        'match_a_pid_number: 1 => 1' ) ;
        is( 1,     match_a_pid_number( 123 ),      'match_a_pid_number: 123 => 1' ) ;
        is( 1,     match_a_pid_number( '123' ),    'match_a_pid_number: "123" => 1' ) ;
        is( undef, match_a_pid_number( 'a123' ),   'match_a_pid_number: a123 => undef' ) ;
        is( 1,     match_a_pid_number( 65535 ),    'match_a_pid_number: 65535 => 1' ) ;
        is( undef, match_a_pid_number( 0 ),        'match_a_pid_number: 0 => undef' ) ;
        is( undef, match_a_pid_number( 65536 ),    'match_a_pid_number: 65536 => undef' ) ;
        is( undef, match_a_pid_number( 99999 ),    'match_a_pid_number: 99999 => undef' ) ;
        return ;
}

sub match_a_pid_number {
        my $pid = shift ;
        if ( !$pid ) { return ; }
        if ( !match( $pid, '^\d+$' ) ) { return ; }
        if ( 0 > $pid )     { return ; }
        if ( 65535 < $pid ) { return ; }
        return 1 ;
}

sub tests_remove_pidfile_not_running {
        is( undef, remove_pidfile_not_running(),                          'remove_pidfile_not_running: no args => undef' ) ;
        is( undef, remove_pidfile_not_running( './W' ),                   'remove_pidfile_not_running: a dir => undef' ) ;
        is( undef, remove_pidfile_not_running( 'noexists' ),              'remove_pidfile_not_running: noexists => undef' ) ;
        is( 1,     touch( 'W/tmp/tests/empty.pid' ),                      'remove_pidfile_not_running: prepa empty W/tmp/tests/empty.pid' ) ;
        is( undef, remove_pidfile_not_running( 'W/tmp/tests/empty.pid' ), 'remove_pidfile_not_running: W/tmp/tests/empty.pid => undef' ) ;
        is( 'lalala', string_to_file( 'lalala', 'W/tmp/tests/lalala.pid' ), 'remove_pidfile_not_running: prepa W/tmp/tests/lalala.pid' ) ;
        is( undef, remove_pidfile_not_running( 'W/tmp/tests/lalala.pid' ), 'remove_pidfile_not_running: W/tmp/tests/lalala.pid => undef' ) ;
        is( '55555', string_to_file( '55555', 'W/tmp/tests/notrunning.pid' ), 'remove_pidfile_not_running: prepa W/tmp/tests/notrunning.pid' ) ;
        is( 1, remove_pidfile_not_running( 'W/tmp/tests/notrunning.pid' ), 'remove_pidfile_not_running: W/tmp/tests/notrunning.pid => 1' ) ;
        is( $PROCESS_ID, string_to_file( $PROCESS_ID, 'W/tmp/tests/running.pid' ), 'remove_pidfile_not_running: prepa W/tmp/tests/running.pid' ) ;
        is( undef, remove_pidfile_not_running( 'W/tmp/tests/running.pid' ), 'remove_pidfile_not_running: W/tmp/tests/running.pid => undef' ) ;

        return ;
}

sub remove_pidfile_not_running {

        #
        my $pid_filename = shift ;

        if ( !$pid_filename )    { return }
        if ( !-e $pid_filename ) { return }
        if ( !-f $pid_filename ) { return }

        my $pid = firstline( $pid_filename ) ;
        if ( !match_a_pid_number( $pid ) ) { return }

        # can't kill myself => do nothing
        if ( !kill 'ZERO', $PROCESS_ID ) { return }

        # can't kill the pid => it is gone or own by another user => remove pidfile
        if ( !kill 'ZERO', $pid ) {
                myprint( "Removing old $pid_filename since its PID $pid is not running anymore (oo-killed?)\n" ) ;
                if ( unlink $pid_filename ) {
                        myprint( "Removed old $pid_filename\n" ) ;
                        return 1 ;
                }
                else {
                        myprint( "Could not remove old $pid_filename because $!\n" ) ;
                        return ;
                }
        }
        myprint( "Another imapsync process $pid is running as says pidfile $pid_filename\n" ) ;
        return ;
}

sub tests_write_pidfile {
        my $mysync ;

        is( 1, write_pidfile(), 'write_pidfile: no args => 1' ) ;

        $mysync->{pidfile} = '/no/no/no.pid' ;
        is( 1, write_pidfile( $mysync ), 'write_pidfile: no permission for /no/no/no.pid, no lock => 1' ) ;
        $mysync->{pidfilelocking} = 1 ;
        is( undef, write_pidfile( $mysync ), 'write_pidfile: no permission for /no/no/no.pid + lock => undef' ) ;

        $mysync->{pidfile} = 'W/tmp/tests/test.pid' ;
        ok( ( -d 'W/tmp/tests/' or mkpath( 'W/tmp/tests/' ) ), 'write_pidfile: mkpath W/tmp/tests/' ) ;
        is( 1, touch( $mysync->{pidfile} ), 'write_pidfile: lock prepa' ) ;

        $mysync->{pidfilelocking} = 0 ;
        is( 1,           write_pidfile( $mysync ),            'write_pidfile: W/tmp/tests/test.pid => 1' ) ;
        is( $PROCESS_ID, firstline( 'W/tmp/tests/test.pid' ), "write_pidfile: W/tmp/tests/test.pid contains $PROCESS_ID" ) ;

        $mysync->{pidfilelocking} = 1 ;
        is( undef, write_pidfile( $mysync ), 'write_pidfile: W/tmp/tests/test.pid + lock => undef' ) ;

        return ;
}

sub write_pidfile {

        # returns undef if something is considered fatal
        # returns 1 otherwise

        if ( !@ARG ) { return 1 ; }

        my $mysync = shift ;

        # Do not write the pid file if this process goal is to abort the process designed by the pid file
        if ( $mysync->{abort} ) { return 1 ; }

        #
        my $pid_filename = $mysync->{pidfile} ;
        my $lock         = $mysync->{pidfilelocking} ;

        myprint( "PID file is $pid_filename ( to change it use --pidfile filepath ; to avoid it use --pidfile \"\" )\n" ) ;
        if ( -e $pid_filename and $lock ) {
                myprint( "$pid_filename already exists, another imapsync may be curently running. Aborting imapsync.\n" ) ;
                return ;

        }
        if ( -e $pid_filename ) {
                myprint( "$pid_filename already exists, overwriting it ( use --pidfilelocking to avoid concurrent runs )\n" ) ;
        }

        if ( open my $FILE_HANDLE, '>', $pid_filename ) {
                myprint( "Writing my PID $PROCESS_ID in $pid_filename\n" ) ;
                print $FILE_HANDLE $PROCESS_ID ;
                close $FILE_HANDLE ;
                return ( 1 ) ;
        }
        else {
                myprint( "Could not open $pid_filename for writing. Check permissions or disk space.\n" ) ;
                if ( $lock ) {
                        return ;
                }
                else {
                        return ( 1 ) ;
                }
        }
}

sub remove_tmp_files {
        my $mysync = shift or return ;
        $mysync->{pidfile} or return ;
        if ( -e $mysync->{pidfile} ) {
                unlink $mysync->{pidfile} ;
        }
        return ;
}

sub exit_clean {
        my $mysync = shift ;
        my $status = shift ;
        $status = defined $status ? $status : $EXIT_UNKNOWN ;
        remove_tmp_files( $mysync ) ;
        myprint( "Exiting with return value $status\n" ) ;
        if ( $mysync->{log} ) {
                myprint( "Log file is $mysync->{logfile} ( to change it, use --logfile filepath ; or use --nolog to turn off logging )\n" ) ;
                close $mysync->{logfile_handle} ;
        }
        exit $status ;
}

sub die_clean {
        my @messages = @_ ;
        remove_tmp_files( $sync ) ;
        myprint( @messages ) ;
        exit 255 ;
}

sub missing_option {
        my ( $option ) = @_ ;
        die_clean( "$option option is mandatory, for help run $PROGRAM_NAME --help\n" ) ;
        return ;
}

sub fix_Inbox_INBOX_mapping {
        my ( $h1_all, $h2_all ) = @_ ;

        my $regex = q{} ;
      SWITCH: {
                if ( exists $h1_all->{INBOX} and exists $h2_all->{INBOX} ) { $regex = q{} ;                  last SWITCH; }
                if ( exists $h1_all->{Inbox} and exists $h2_all->{Inbox} ) { $regex = q{} ;                  last SWITCH; }
                if ( exists $h1_all->{INBOX} and exists $h2_all->{Inbox} ) { $regex = q{s/^INBOX$/Inbox/x} ; last SWITCH; }
                if ( exists $h1_all->{Inbox} and exists $h2_all->{INBOX} ) { $regex = q{s/^Inbox$/INBOX/x} ; last SWITCH; }
        }
        return ( $regex ) ;
}

sub tests_fix_Inbox_INBOX_mapping {
        note( 'Entering tests_fix_Inbox_INBOX_mapping()' ) ;

        my ( $h1_all, $h2_all ) ;

        $h1_all = { 'INBOX' => q{} } ;
        $h2_all = { 'INBOX' => q{} } ;
        ok( q{} eq fix_Inbox_INBOX_mapping( $h1_all, $h2_all ), 'fix_Inbox_INBOX_mapping: INBOX INBOX' ) ;

        $h1_all = { 'Inbox' => q{} } ;
        $h2_all = { 'Inbox' => q{} } ;
        ok( q{} eq fix_Inbox_INBOX_mapping( $h1_all, $h2_all ), 'fix_Inbox_INBOX_mapping: Inbox Inbox' ) ;

        $h1_all = { 'INBOX' => q{} } ;
        $h2_all = { 'Inbox' => q{} } ;
        ok( q{s/^INBOX$/Inbox/x} eq fix_Inbox_INBOX_mapping( $h1_all, $h2_all ), 'fix_Inbox_INBOX_mapping: INBOX Inbox' ) ;

        $h1_all = { 'Inbox' => q{} } ;
        $h2_all = { 'INBOX' => q{} } ;
        ok( q{s/^Inbox$/INBOX/x} eq fix_Inbox_INBOX_mapping( $h1_all, $h2_all ), 'fix_Inbox_INBOX_mapping: Inbox INBOX' ) ;

        $h1_all = { 'INBOX' => q{} } ;
        $h2_all = { 'rrrrr' => q{} } ;
        ok( q{} eq fix_Inbox_INBOX_mapping( $h1_all, $h2_all ), 'fix_Inbox_INBOX_mapping: INBOX rrrrrr' ) ;

        $h1_all = { 'rrrrr' => q{} } ;
        $h2_all = { 'Inbox' => q{} } ;
        ok( q{} eq fix_Inbox_INBOX_mapping( $h1_all, $h2_all ), 'fix_Inbox_INBOX_mapping: rrrrr Inbox' ) ;

        note( 'Leaving  tests_fix_Inbox_INBOX_mapping()' ) ;
        return ;
}

sub jux_utf8_list {
        my @s_inp = @_ ;
        my $s_out = q{} ;
        foreach my $s ( @s_inp ) {
                $s_out .= jux_utf8( $s ) . "\n" ;
        }
        return ( $s_out ) ;
}

sub tests_jux_utf8_list {
        note( 'Entering tests_jux_utf8_list()' ) ;

        ok( q{} eq jux_utf8_list(),                         'jux_utf8_list: void' ) ;
        ok( "[]\n" eq jux_utf8_list( q{} ),                 'jux_utf8_list: empty string' ) ;
        ok( "[INBOX]\n" eq jux_utf8_list( 'INBOX' ),        'jux_utf8_list: INBOX' ) ;
        ok( "[&ANY-] = [Ö]\n" eq jux_utf8_list( '&ANY-' ), 'jux_utf8_list: &ANY-' ) ;

        note( 'Leaving  tests_jux_utf8_list()' ) ;
        return ( 0 ) ;
}

sub jux_utf8 {

        # juxtapose utf8 at the right if different
        my ( $s_utf7 ) = shift ;
        my ( $s_utf8 ) = imap_utf7_decode( $s_utf7 ) ;

        if ( $s_utf7 eq $s_utf8 ) {

                #myprint( "[$s_utf7]\n"  ) ;
                return ( "[$s_utf7]" ) ;
        }
        else {
                #myprint( "[$s_utf7] = [$s_utf8]\n"  ) ;
                return ( "[$s_utf7] = [$s_utf8]" ) ;
        }
}

# editing utf8 can be tricky without an utf8 editor
sub tests_jux_utf8 {
        note( 'Entering tests_jux_utf8()' ) ;

        ok( '[INBOX]' eq jux_utf8( 'INBOX' ),                                                    'jux_utf8: INBOX => [INBOX]' ) ;
        ok( '[&ZTZO9nux-] = [收件箱]' eq jux_utf8( '&ZTZO9nux-' ),                            'jux_utf8: => [&ZTZO9nux-] = [收件箱]' ) ;
        ok( '[&ANY-] = [Ö]' eq jux_utf8( '&ANY-' ),                                             'jux_utf8: &ANY- => [&ANY-] = [Ö]' ) ;
        ok( '[]' eq jux_utf8( q{} ),                                                             'jux_utf8: void => []' ) ;
        ok( '[+BD8EQAQ1BDQEOwQ+BDM-] = [предлог]' eq jux_utf8( '+BD8EQAQ1BDQEOwQ+BDM-' ), 'jux_utf8: => [+BD8EQAQ1BDQEOwQ+BDM-] = [предлог]' ) ;
        ok( '[&BB8EQAQ+BDUEOgRC-] = [Проект]' eq jux_utf8( '&BB8EQAQ+BDUEOgRC-' ),         'jux_utf8: => [&BB8EQAQ+BDUEOgRC-] = [Проект]' ) ;

        note( 'Leaving  tests_jux_utf8()' ) ;
        return ;
}

# Copied from http://cpansearch.perl.org/src/FABPOT/Unicode-IMAPUtf7-2.01/lib/Unicode/IMAPUtf7.pm
# and then fixed with
# https://rt.cpan.org/Public/Bug/Display.html?id=11172
sub imap_utf7_decode {
        my ( $s ) = shift ;

        # Algorithm
        # On remplace , par / dans les BASE 64 (, entre & et -)
        # On remplace les &, non suivi d'un - par +
        # On remplace les &- par &
        $s =~ s/&([^,&\-]*),([^,\-&]*)\-/&$1\/$2\-/xg ;
        $s =~ s/&(?!\-)/\+/xg ;
        $s =~ s/&\-/&/xg ;
        return ( Unicode::String::utf7( $s )->utf8 ) ;
}

sub imap_utf7_encode {
        my ( $s ) = @_ ;

        $s = Unicode::String::utf8( $s )->utf7 ;

        $s =~ s/\+([^\/&\-]*)\/([^\/\-&]*)\-/\+$1,$2\-/xg ;
        $s =~ s/&/&\-/xg ;
        $s =~ s/\+([^+\-]+)?\-/&$1\-/xg ;
        return ( $s ) ;
}

sub select_folder {
        my ( $imap, $folder, $hostside ) = @_ ;
        if ( !$imap->select( $folder ) ) {
                my $error = join q{}, "$hostside folder $folder: Could not select: ", $imap->LastError, "\n" ;
                errors_incr( $sync, $error ) ;
                return ( 0 ) ;
        }
        else {
                # ok select succeeded
                return ( 1 ) ;
        }
}

sub examine_folder {
        my ( $imap, $folder, $hostside ) = @_ ;
        if ( !$imap->examine( $folder ) ) {
                my $error = join q{}, "$hostside folder $folder: Could not examine: ", $imap->LastError, "\n" ;
                errors_incr( $sync, $error ) ;
                return ( 0 ) ;
        }
        else {
                # ok select succeeded
                return ( 1 ) ;
        }
}

sub count_from_select {
        my @lines = @_ ;
        my $count ;
        foreach my $line ( @lines ) {

                #myprint( "line = [$line]\n"  ) ;
                if ( $line =~ m/^\*\s+(\d+)\s+EXISTS/x ) {
                        $count = $1 ;
                        return ( $count ) ;
                }
        }
        return ( undef ) ;
}

sub create_folder_old {
        my ( $imap, $h2_fold, $h1_fold ) = @_ ;

        myprint( "Creating (old way) folder [$h2_fold] on host2\n" ) ;
        if (        ( 'INBOX' eq uc $h2_fold )
                and ( $imap->exists( $h2_fold ) ) )
        {
                myprint( "Folder [$h2_fold] already exists\n" ) ;
                return ( 1 ) ;
        }
        if ( !$sync->{dry} ) {
                if ( !$imap->create( $h2_fold ) ) {
                        my $error = join q{}, "Could not create folder [$h2_fold] from [$h1_fold]: ", $imap->LastError(), "\n" ;
                        errors_incr( $sync, $error ) ;

                        # success if folder exists ("already exists" error)
                        return ( 1 ) if $imap->exists( $h2_fold ) ;

                        # failure since create failed
                        return ( 0 ) ;
                }
                else {
                        #create succeeded
                        myprint( "Created ( the old way ) folder [$h2_fold] on host2\n" ) ;
                        return ( 1 ) ;
                }
        }
        else {
                # dry mode, no folder so many imap will fail, assuming failure
                myprint( "Created ( the old way ) folder [$h2_fold] on host2 $sync->{dry_message}\n" ) ;
                return ( 0 ) ;
        }
}

sub create_folder {
        my ( $imap2, $h2_fold, $h1_fold ) = @_ ;
        my ( @parts, $parent ) ;

        if ( $imap2->IsUnconnected() ) {
                myprint( "Host2: Unconnected state\n" ) ;
                return ( 0 ) ;
        }

        if ( $create_folder_old ) {
                return ( create_folder_old( $imap2, $h2_fold, $h1_fold ) ) ;
        }
        myprint( "Creating folder [$h2_fold] on host2\n" ) ;
        if (        ( 'INBOX' eq uc $h2_fold )
                and ( $imap2->exists( $h2_fold ) ) )
        {
                myprint( "Folder [$h2_fold] already exists\n" ) ;
                return ( 1 ) ;
        }

        if ( $mixfolders and $imap2->exists( $h2_fold ) ) {
                myprint( "Folder [$h2_fold] already exists  (--nomixfolders is not set)\n" ) ;
                return ( 1 ) ;
        }

        if ( ( not $mixfolders ) and ( $imap2->exists( $h2_fold ) ) ) {
                myprint( "Folder [$h2_fold] already exists and --nomixfolders is set\n" ) ;
                return ( 0 ) ;
        }

        @parts = split /\Q$h2_sep\E/x, $h2_fold ;
        pop @parts ;
        $parent = join $h2_sep, @parts ;
        $parent =~ s/^\s+|\s+$//xg ;
        if ( ( $parent ne q{} ) and ( !$imap2->exists( $parent ) ) ) {
                create_folder( $imap2, $parent, $h1_fold ) ;
        }

        if ( !$sync->{dry} ) {
                if ( !$imap2->create( $h2_fold ) ) {
                        my $error = join q{}, "Could not create folder [$h2_fold] from [$h1_fold]: ", $imap2->LastError(), "\n" ;
                        errors_incr( $sync, $error ) ;

                        # success if folder exists ("already exists" error)
                        return ( 1 ) if $imap2->exists( $h2_fold ) ;

                        # failure since create failed
                        return ( 0 ) ;
                }
                else {
                        #create succeeded
                        myprint( "Created folder [$h2_fold] on host2\n" ) ;
                        return ( 1 ) ;
                }
        }
        else {
                # dry mode, no folder so many imap will fail, assuming failure
                myprint( "Created  folder [$h2_fold] on host2 $sync->{dry_message}\n" ) ;
                if ( !$justfolders ) {
                        myprint( "Since --dry mode is on and folder [$h2_fold] on host2 does not exist yet, syncing messages will not be simulated.\n" . "To simulate message syncing, use --justfolders without --dry to first create the missing folders then rerun the --dry sync.\n" ) ;
                }
                return ( 0 ) ;
        }
}

sub tests_folder_routines {
        note( 'Entering tests_folder_routines()' ) ;

        ok( !is_requested_folder( 'folder_foo' ),           'is_requested_folder folder_foo 1' ) ;
        ok( add_to_requested_folders( 'folder_foo' ),       'add_to_requested_folders folder_foo' ) ;
        ok( is_requested_folder( 'folder_foo' ),            'is_requested_folder folder_foo 2' ) ;
        ok( !is_requested_folder( 'folder_NO_EXIST' ),      'is_requested_folder folder_NO_EXIST' ) ;
        ok( !remove_from_requested_folders( 'folder_foo' ), 'removed folder_foo' ) ;
        ok( !is_requested_folder( 'folder_foo' ),           'is_requested_folder folder_foo 3' ) ;
        my @f ;
        ok( @f = add_to_requested_folders( 'folder_bar', 'folder_toto' ), "add result: @f" ) ;
        ok( is_requested_folder( 'folder_bar' ),            'is_requested_folder 4' ) ;
        ok( is_requested_folder( 'folder_toto' ),           'is_requested_folder 5' ) ;
        ok( remove_from_requested_folders( 'folder_toto' ), 'remove_from_requested_folders: ' ) ;
        ok( !is_requested_folder( 'folder_toto' ),          'is_requested_folder 6' ) ;
        ok( !remove_from_requested_folders( 'folder_bar' ), 'remove_from_requested_folders: empty' ) ;

        ok( 0 == compare_lists( [ sort_requested_folders() ], [] ), 'sort_requested_folders: all empty' ) ;
        ok( add_to_requested_folders( 'M_55' ), 'add_to_requested_folders M_55' ) ;
        ok( 0 == compare_lists( [ sort_requested_folders() ], ['M_55'] ), 'sort_requested_folders: middle' ) ;
        @folderfirst = ( 'Z_11' ) ;
        ok( 0 == compare_lists( [ sort_requested_folders() ], [ 'Z_11', 'M_55' ] ), 'sort_requested_folders: first+middle' ) ;
        @folderlast = ( 'A_99' ) ;
        ok( 0 == compare_lists( [ sort_requested_folders() ], [ 'Z_11', 'M_55', 'A_99' ] ), 'sort_requested_folders: first+middle+last 1' ) ;

        ok( add_to_requested_folders( 'M_55', 'M_44', ), 'add_to_requested_folders M_55 M_44' ) ;
        ok( 0 == compare_lists( [ sort_requested_folders() ], [ 'Z_11', 'M_44', 'M_55', 'A_99' ] ), 'sort_requested_folders: first+middle+last 2' ) ;
        @folderfirst = qw( Z_22  Z_11 ) ;
        @folderlast  = qw( A_99  A_88 ) ;
        ok( 0 == compare_lists( [ sort_requested_folders() ], [ 'Z_22', 'Z_11', 'M_44', 'M_55', 'A_99', 'A_88' ] ), 'sort_requested_folders: first+middle+last 3' ) ;

        note( 'Leaving  tests_folder_routines()' ) ;
        return ;
}

sub sort_requested_folders {
        my @requested_folders_sorted = () ;

        foreach my $folder ( @folderfirst ) {
                remove_from_requested_folders( $folder ) ;
        }

        foreach my $folder ( @folderlast ) {
                remove_from_requested_folders( $folder ) ;
        }

        my @middle = sort keys %requested_folder ;

        @requested_folders_sorted = ( @folderfirst, @middle, @folderlast ) ;

        return ( @requested_folders_sorted ) ;
}

sub is_requested_folder {
        my ( $folder ) = @_ ;

        return ( defined $requested_folder{$folder} ) ;
}

sub add_to_requested_folders {
        my @wanted_folders = @_ ;

        foreach my $folder ( @wanted_folders ) {
                ++$requested_folder{$folder} ;
        }
        return ( keys %requested_folder ) ;
}

sub remove_from_requested_folders {
        my @wanted_folders = @_ ;

        foreach my $folder ( @wanted_folders ) {
                delete $requested_folder{$folder} ;
        }
        return ( keys %requested_folder ) ;
}

sub compare_lists {
        my ( $list_1_ref, $list_2_ref ) = @_ ;

        return ( $MINUS_ONE ) if ( ( not defined $list_1_ref ) and defined $list_2_ref ) ;
        return ( 0 ) if ( ( not defined $list_1_ref ) and not defined $list_2_ref ) ;    # end if no list
        return ( 1 ) if ( not defined $list_2_ref ) ;    # end if only one list

        if ( not ref $list_1_ref ) { $list_1_ref = [$list_1_ref] }
        if ( not ref $list_2_ref ) { $list_2_ref = [$list_2_ref] }

        my $last_used_indice = $MINUS_ONE ;

      ELEMENT:
        foreach my $indice ( 0 .. $#{$list_1_ref} ) {
                $last_used_indice = $indice ;

                # End of list_2
                return 1 if ( $indice > $#{$list_2_ref} ) ;

                my $element_list_1 = $list_1_ref->[$indice] ;
                my $element_list_2 = $list_2_ref->[$indice] ;
                my $balance        = $element_list_1 cmp $element_list_2 ;
                next ELEMENT if ( $balance == 0 ) ;
                return $balance ;
        }

        # each element equal until last indice of list_1
        return $MINUS_ONE if ( $last_used_indice < $#{$list_2_ref} ) ;

        # same size, each element equal
        return 0 ;
}

sub tests_compare_lists {
        note( 'Entering tests_compare_lists()' ) ;

        my $empty_list_ref = [] ;

        ok( 0 == compare_lists(),        'compare_lists, no args' ) ;
        ok( 0 == compare_lists( undef ), 'compare_lists, undef = nothing' ) ;
        ok( 0 == compare_lists( undef, undef ), 'compare_lists, undef = undef' ) ;
        ok( $MINUS_ONE == compare_lists( undef, [] ),  'compare_lists, undef < []' ) ;
        ok( $MINUS_ONE == compare_lists( undef, [1] ), 'compare_lists, undef < [1]' ) ;
        ok( $MINUS_ONE == compare_lists( undef, [0] ), 'compare_lists, undef < [0]' ) ;
        ok( +1 == compare_lists(                [] ),  'compare_lists, [] > nothing' ) ;
        ok( +1 == compare_lists( [], undef ), 'compare_lists, [] > undef' ) ;
        ok( 0 == compare_lists( [], [] ), 'compare_lists, [] = []' ) ;

        ok( $MINUS_ONE == compare_lists( [],  [1] ), 'compare_lists, [] < [1]' ) ;
        ok( +1 == compare_lists(         [1], [] ),  'compare_lists, [1] > []' ) ;

        ok( 0 == compare_lists( [1], 1 ), 'compare_lists, [1] =  1 ' ) ;
        ok( 0 == compare_lists( 1, [1] ), 'compare_lists,  1  = [1]' ) ;
        ok( 0 == compare_lists( 1, 1 ), 'compare_lists,  1  =  1 ' ) ;
        ok( $MINUS_ONE == compare_lists( 0,          1 ), 'compare_lists,  0  <  1 ' ) ;
        ok( $MINUS_ONE == compare_lists( $MINUS_ONE, 0 ), 'compare_lists, -1  <  0 ' ) ;
        ok( $MINUS_ONE == compare_lists( 1,          2 ), 'compare_lists,  1  <  2 ' ) ;
        ok( +1 == compare_lists( 2, 1 ), 'compare_lists,  2  >  1 ' ) ;

        ok( 0 == compare_lists( [ 1, 2 ], [ 1, 2 ] ), 'compare_lists,  [1,2] = [1,2]' ) ;
        ok( $MINUS_ONE == compare_lists( [1], [ 1, 2 ] ), 'compare_lists,    [1] < [1,2]' ) ;
        ok( +1 == compare_lists( [2], [ 1, 2 ] ), 'compare_lists,    [2] > [1,2]' ) ;
        ok( $MINUS_ONE == compare_lists( [1], [ 1, 1 ] ), 'compare_lists,    [1] < [1,1]' ) ;
        ok( +1 == compare_lists( [ 1, 1 ], [1] ), 'compare_lists, [1, 1] >   [1]' ) ;
        ok( 0 == compare_lists(          [ 1 .. $NUMBER_20_000 ], [ 1 .. $NUMBER_20_000 ] ), 'compare_lists, [1..20_000] = [1..20_000]' ) ;
        ok( $MINUS_ONE == compare_lists( [1],                     [2] ),                     'compare_lists, [1] < [2]' ) ;
        ok( 0 == compare_lists(          [2],                     [2] ),                     'compare_lists, [0] = [2]' ) ;
        ok( +1 == compare_lists(         [2],                     [1] ),                     'compare_lists, [2] > [1]' ) ;

        ok( $MINUS_ONE == compare_lists( ['a'],  ['b'] ),  'compare_lists, ["a"] < ["b"]' ) ;
        ok( 0 == compare_lists(          ['a'],  ['a'] ),  'compare_lists, ["a"] = ["a"]' ) ;
        ok( 0 == compare_lists(          ['ab'], ['ab'] ), 'compare_lists, ["ab"] = ["ab"]' ) ;
        ok( +1 == compare_lists(         ['b'],  ['a'] ),  'compare_lists, ["b"] > ["a"]' ) ;
        ok( $MINUS_ONE == compare_lists( ['a'],  ['aa'] ), 'compare_lists, ["a"] < ["aa"]' ) ;
        ok( $MINUS_ONE == compare_lists( ['a'], [ 'a', 'a' ] ), 'compare_lists, ["a"] < ["a", "a"]' ) ;
        ok( 0 == compare_lists( [ split q{ },      'a b' ], [ 'a', 'b' ] ), 'compare_lists, split' ) ;
        ok( 0 == compare_lists( [ sort split q{ }, 'b a' ], [ 'a', 'b' ] ), 'compare_lists, sort split' ) ;

        note( 'Leaving  tests_compare_lists()' ) ;
        return ;
}

sub guess_prefix {
        my @foldernames = @_ ;

        my $prefix_guessed = q{} ;
        foreach my $folder ( @foldernames ) {
                next if ( $folder =~ m{^INBOX$}xi ) ;    # no guessing from INBOX
                if ( $folder !~ m{^INBOX}xi ) {
                        $prefix_guessed = q{} ;          # prefix empty guessed
                        last ;
                }
                if ( $folder =~ m{^(INBOX(?:\.|\/))}xi ) {
                        $prefix_guessed = $1 ;           # prefix Inbox/ or INBOX. guessed
                }
        }
        return ( $prefix_guessed ) ;
}

sub tests_guess_prefix {
        note( 'Entering tests_guess_prefix()' ) ;

        is( guess_prefix(), q{},                     'guess_prefix: no args => empty string' ) ;
        is( q{},            guess_prefix( 'INBOX' ), 'guess_prefix: INBOX alone' ) ;
        is( q{},            guess_prefix( 'Inbox' ), 'guess_prefix: Inbox alone' ) ;
        is( q{},            guess_prefix( 'INBOX' ), 'guess_prefix: INBOX alone' ) ;
        is( 'INBOX/', guess_prefix( 'INBOX', 'INBOX/Junk' ), 'guess_prefix: INBOX INBOX/Junk' ) ;
        is( 'INBOX.', guess_prefix( 'INBOX', 'INBOX.Junk' ), 'guess_prefix: INBOX INBOX.Junk' ) ;
        is( 'Inbox/', guess_prefix( 'Inbox', 'Inbox/Junk' ), 'guess_prefix: Inbox Inbox/Junk' ) ;
        is( 'Inbox.', guess_prefix( 'Inbox', 'Inbox.Junk' ), 'guess_prefix: Inbox Inbox.Junk' ) ;
        is( 'INBOX/', guess_prefix( 'INBOX', 'INBOX/Junk', 'INBOX/rrr' ), 'guess_prefix: INBOX INBOX/Junk INBOX/rrr' ) ;
        is( q{}, guess_prefix( 'INBOX', 'INBOX/Junk', 'INBOX/rrr', 'zzz' ), 'guess_prefix: INBOX INBOX/Junk INBOX/rrr zzz' ) ;
        is( q{}, guess_prefix( 'INBOX', 'Junk' ), 'guess_prefix: INBOX Junk' ) ;
        is( q{}, guess_prefix( 'INBOX', 'Junk' ), 'guess_prefix: INBOX Junk' ) ;

        note( 'Leaving  tests_guess_prefix()' ) ;
        return ;
}

sub get_prefix {
        my ( $imap, $prefix_in, $prefix_opt, $Side, $folders_ref ) = @_ ;
        my ( $prefix_out, $prefix_guessed ) ;

        ( $debug or $sync->{debugfolders} ) and myprint( "$Side: Getting prefix\n" ) ;
        $prefix_guessed = guess_prefix( @{$folders_ref} ) ;
        myprint( "$Side: guessing prefix from folder listing: [$prefix_guessed]\n" ) ;
        ( $debug or $sync->{debugfolders} ) and myprint( "$Side: Calling namespace capability\n" ) ;
        if ( $imap->has_capability( 'namespace' ) ) {
                my $r_namespace = $imap->namespace() ;
                $prefix_out = $r_namespace->[0][0][0] ;
                myprint( "$Side: prefix given by NAMESPACE: [$prefix_out]\n" ) ;
                if ( defined $prefix_in ) {
                        myprint( "$Side: but using [$prefix_in] given by $prefix_opt\n" ) ;
                        $prefix_out = $prefix_in ;
                        return ( $prefix_out ) ;
                }
                else {
                        # all good
                        return ( $prefix_out ) ;
                }
        }
        else {
                if ( defined $prefix_in ) {
                        myprint( "$Side: using [$prefix_in] given by $prefix_opt\n" ) ;
                        $prefix_out = $prefix_in ;
                        return ( $prefix_out ) ;
                }
                else {
                        myprint( "$Side: No NAMESPACE capability so using guessed prefix [$prefix_guessed]\n", help_to_guess_prefix( $imap, $prefix_opt ) ) ;
                        return ( $prefix_guessed ) ;
                }
        }
        return ;
}

sub guess_separator {
        my @foldernames = @_ ;

        #return( undef ) unless ( @foldernames ) ;

        my $sep_guessed ;
        my %counter ;
        foreach my $folder ( @foldernames ) {
                $counter{'/'}++    while ( $folder =~ m{/}xg ) ;                        # count /
                $counter{'.'}++    while ( $folder =~ m{\.}xg ) ;                       # count .
                $counter{'\\\\'}++ while ( $folder =~ m{(\\){2}}xg ) ;                  # count \\
                $counter{'\\'}++   while ( $folder =~ m{[^\\](\\){1}(?=[^\\])}xg ) ;    # count \
        }
        my @race_sorted = sort { $counter{$b} <=> $counter{$a} } keys %counter ;
        $debug and myprint( "@foldernames\n@race_sorted\n", %counter, "\n" ) ;
        $sep_guessed = shift @race_sorted || $LAST_RESSORT_SEPARATOR ;                  # / when nothing found.
        return ( $sep_guessed ) ;
}

sub tests_guess_separator {
        note( 'Entering tests_guess_separator()' ) ;

        ok( '/' eq guess_separator(),                              'guess_separator: no args' ) ;
        ok( '/' eq guess_separator( 'abcd' ),                      'guess_separator: abcd' ) ;
        ok( '/' eq guess_separator( 'a/b/c.d' ),                   'guess_separator: a/b/c.d' ) ;
        ok( '.' eq guess_separator( 'a.b/c.d' ),                   'guess_separator: a.b/c.d' ) ;
        ok( '\\\\' eq guess_separator( 'a\\\\b\\\\c.c\\\\d/e/f' ), 'guess_separator: a\\\\b\\\\c.c\\\\d/e/f' ) ;
        ok( '\\' eq guess_separator( 'a\\b\\c.c\\d/e/f' ),         'guess_separator: a\\b\\c.c\\d/e/f' ) ;
        ok( '\\' eq guess_separator( 'a\\b' ),                     'guess_separator: a\\b' ) ;
        ok( '\\' eq guess_separator( 'a\\b\\c' ),                  'guess_separator: a\\b\\c' ) ;

        note( 'Leaving  tests_guess_separator()' ) ;
        return ;
}

sub get_separator {
        my ( $imap, $sep_in, $sep_opt, $Side, $folders_ref ) = @_ ;
        my ( $sep_out, $sep_guessed ) ;

        ( $debug or $sync->{debugfolders} ) and myprint( "$Side: Getting separator\n" ) ;
        $sep_guessed = guess_separator( @{$folders_ref} ) ;
        myprint( "$Side: guessing separator from folder listing: [$sep_guessed]\n" ) ;

        ( $debug or $sync->{debugfolders} ) and myprint( "$Side: calling namespace capability\n" ) ;
        if ( $imap->has_capability( 'namespace' ) ) {
                $sep_out = $imap->separator() ;
                if ( defined $sep_out ) {
                        myprint( "$Side: separator given by NAMESPACE: [$sep_out]\n" ) ;
                        if ( defined $sep_in ) {
                                myprint( "$Side: but using [$sep_in] given by $sep_opt\n" ) ;
                                $sep_out = $sep_in ;
                                return ( $sep_out ) ;
                        }
                        else {
                                return ( $sep_out ) ;
                        }
                }
                else {
                        if ( defined $sep_in ) {
                                myprint( "$Side: NAMESPACE request failed but using [$sep_in] given by $sep_opt\n" ) ;
                                $sep_out = $sep_in ;
                                return ( $sep_out ) ;
                        }
                        else {
                                myprint( "$Side: NAMESPACE request failed so using guessed separator [$sep_guessed]\n", help_to_guess_sep( $imap, $sep_opt ) ) ;
                                return ( $sep_guessed ) ;
                        }
                }
        }
        else {
                if ( defined $sep_in ) {
                        myprint( "$Side: No NAMESPACE capability but using [$sep_in] given by $sep_opt\n" ) ;
                        $sep_out = $sep_in ;
                        return ( $sep_out ) ;
                }
                else {
                        myprint( "$Side: No NAMESPACE capability, so using guessed separator [$sep_guessed]\n", help_to_guess_sep( $imap, $sep_opt ) ) ;
                        return ( $sep_guessed ) ;
                }
        }
        return ;
}

sub help_to_guess_sep {
        my ( $imap, $sep_opt ) = @_ ;

        my $help_to_guess_sep = "You can set the separator character with the $sep_opt option,\n" . "the complete listing of folders may help you to find it\n" . folders_list_to_help( $imap ) ;

        return ( $help_to_guess_sep ) ;
}

sub help_to_guess_prefix {
        my ( $imap, $prefix_opt ) = @_ ;

        my $help_to_guess_prefix = "You can set the prefix namespace with the $prefix_opt option,\n" . "the folowing listing of folders may help you to find it:\n" . folders_list_to_help( $imap ) ;

        return ( $help_to_guess_prefix ) ;
}

sub folders_list_to_help {
        my ( $imap ) = shift ;

        my @folders = $imap->folders ;
        my $listing = join q{}, map { "[$_]\n" } @folders ;
        return ( $listing ) ;
}

sub tests_imap2_folder_name {
        note( 'Entering tests_imap2_folder_name()' ) ;

        $sync->{h1_prefix} = $sync->{h2_prefix} = q{} ;
        $h1_sep            = '/' ;
        $h2_sep            = '.' ;

        $debug and myprint(
                <<"EOS"
prefix1: [$sync->{ h1_prefix }]
prefix2: [$sync->{ h2_prefix }]
sep1:[$h1_sep]
sep2:[$h2_sep]
EOS
        ) ;

        $fixslash2 = 0 ;
        ok( q{} eq imap2_folder_name( q{} ),                                 'imap2_folder_name: empty string' ) ;
        ok( 'blabla' eq imap2_folder_name( 'blabla' ),                       'imap2_folder_name: blabla' ) ;
        ok( 'spam.spam' eq imap2_folder_name( 'spam/spam' ),                 'imap2_folder_name: spam/spam' ) ;
        ok( 'spam/spam' eq imap2_folder_name( 'spam.spam' ),                 'imap2_folder_name: spam.spam' ) ;
        ok( 'spam.spam/spam' eq imap2_folder_name( 'spam/spam.spam' ),       'imap2_folder_name: spam/spam.spam' ) ;
        ok( 's pam.spam/sp  am' eq imap2_folder_name( 's pam/spam.sp  am' ), 'imap2_folder_name: s pam/spam.sp  am' ) ;

        $sync->{f1f2h}{'auto'} = 'moto' ;
        ok( 'moto' eq imap2_folder_name( 'auto' ), 'imap2_folder_name: auto' ) ;
        $sync->{f1f2h}{'auto/auto'} = 'moto x 2' ;
        ok( 'moto x 2' eq imap2_folder_name( 'auto/auto' ), 'imap2_folder_name: auto/auto' ) ;

        @regextrans2 = ( 's,/,X,g' ) ;
        ok( q{} eq imap2_folder_name( q{} ),                           'imap2_folder_name: empty string [s,/,X,g]' ) ;
        ok( 'blabla' eq imap2_folder_name( 'blabla' ),                 'imap2_folder_name: blabla [s,/,X,g]' ) ;
        ok( 'spam.spam' eq imap2_folder_name( 'spam/spam' ),           'imap2_folder_name: spam/spam [s,/,X,g]' ) ;
        ok( 'spamXspam' eq imap2_folder_name( 'spam.spam' ),           'imap2_folder_name: spam.spam [s,/,X,g]' ) ;
        ok( 'spam.spamXspam' eq imap2_folder_name( 'spam/spam.spam' ), 'imap2_folder_name: spam/spam.spam [s,/,X,g]' ) ;

        @regextrans2 = ( 's, ,_,g' ) ;
        ok( 'blabla' eq imap2_folder_name( 'blabla' ),   'imap2_folder_name: blabla [s, ,_,g]' ) ;
        ok( 'bla_bla' eq imap2_folder_name( 'bla bla' ), 'imap2_folder_name: blabla [s, ,_,g]' ) ;

        @regextrans2 = ( q{s,(.*),\U$1,} ) ;
        ok( 'BLABLA' eq imap2_folder_name( 'blabla' ), q{imap2_folder_name: blabla [s,\U(.*)\E,$1,]} ) ;

        $fixslash2   = 1 ;
        @regextrans2 = () ;
        ok( q{} eq imap2_folder_name( q{} ),                                 'imap2_folder_name: empty string' ) ;
        ok( 'blabla' eq imap2_folder_name( 'blabla' ),                       'imap2_folder_name: blabla' ) ;
        ok( 'spam.spam' eq imap2_folder_name( 'spam/spam' ),                 'imap2_folder_name: spam/spam -> spam.spam' ) ;
        ok( 'spam_spam' eq imap2_folder_name( 'spam.spam' ),                 'imap2_folder_name: spam.spam -> spam_spam' ) ;
        ok( 'spam.spam_spam' eq imap2_folder_name( 'spam/spam.spam' ),       'imap2_folder_name: spam/spam.spam -> spam.spam_spam' ) ;
        ok( 's pam.spam_spa  m' eq imap2_folder_name( 's pam/spam.spa  m' ), 'imap2_folder_name: s pam/spam.spa m -> s pam.spam_spa  m' ) ;

        $h1_sep = '.' ;
        $h2_sep = '/' ;
        ok( q{} eq imap2_folder_name( q{} ),                           'imap2_folder_name: empty string' ) ;
        ok( 'blabla' eq imap2_folder_name( 'blabla' ),                 'imap2_folder_name: blabla' ) ;
        ok( 'spam.spam' eq imap2_folder_name( 'spam/spam' ),           'imap2_folder_name: spam/spam -> spam.spam' ) ;
        ok( 'spam/spam' eq imap2_folder_name( 'spam.spam' ),           'imap2_folder_name: spam.spam -> spam/spam' ) ;
        ok( 'spam.spam/spam' eq imap2_folder_name( 'spam/spam.spam' ), 'imap2_folder_name: spam/spam.spam -> spam.spam/spam' ) ;

        $fixslash2 = 0 ;
        $sync->{h1_prefix} = q{ } ;

        ok( 'spam.spam/spam' eq imap2_folder_name( 'spam/spam.spam' ),  'imap2_folder_name: spam/spam.spam -> spam.spam/spam' ) ;
        ok( 'spam.spam/spam' eq imap2_folder_name( ' spam/spam.spam' ), 'imap2_folder_name:  spam/spam.spam -> spam.spam/spam' ) ;

        $h1_sep            = '.' ;
        $h2_sep            = '/' ;
        $sync->{h1_prefix} = 'INBOX.' ;
        $sync->{h2_prefix} = q{} ;
        @regextrans2       = ( q{s,(.*),\U$1,} ) ;
        ok( 'BLABLA' eq imap2_folder_name( 'blabla' ),                                 'imap2_folder_name: blabla' ) ;
        ok( 'TEST/TEST/TEST/TEST' eq imap2_folder_name( 'INBOX.TEST.test.Test.tesT' ), 'imap2_folder_name: INBOX.TEST.test.Test.tesT' ) ;
        @regextrans2 = ( q{s,(.*),\L$1,} ) ;
        ok( 'test/test/test/test' eq imap2_folder_name( 'INBOX.TEST.test.Test.tesT' ), 'imap2_folder_name: INBOX.TEST.test.Test.tesT' ) ;

        note( 'Leaving  tests_imap2_folder_name()' ) ;
        return ;

}

# Global variables to remove:
#  $debug
#  $sync

sub imap2_folder_name {
        my $mysync      = $sync ;    # will be soon next line
                                     #my $mysync = shift ;
        my ( $h1_fold ) = shift ;
        my ( $h2_fold ) ;
        if ( $mysync->{f1f2h}{$h1_fold} ) {
                $h2_fold = $mysync->{f1f2h}{$h1_fold} ;
                ( $debug or $mysync->{debugfolders} ) and myprint( "f1f2 [$h1_fold] -> [$h2_fold]\n" ) ;
                return ( $h2_fold ) ;
        }
        if ( $mysync->{f1f2auto}{$h1_fold} ) {
                $h2_fold = $mysync->{f1f2auto}{$h1_fold} ;
                ( $debug or $mysync->{debugfolders} ) and myprint( "automap [$h1_fold] -> [$h2_fold]\n" ) ;
                return ( $h2_fold ) ;
        }

        $h2_fold = prefix_seperator_invertion( $mysync, $h1_fold ) ;
        $h2_fold = regextrans2( $h2_fold ) ;
        return ( $h2_fold ) ;
}

sub tests_prefix_seperator_invertion {
        undef $h1_sep ;
        undef $h2_sep ;

        is( undef, prefix_seperator_invertion(), 'prefix_seperator_invertion: no args => undef' ) ;
        is( q{},       prefix_seperator_invertion( undef, q{} ),       'prefix_seperator_invertion: empty string => empty string' ) ;
        is( 'lalala',  prefix_seperator_invertion( undef, 'lalala' ),  'prefix_seperator_invertion: lalala => lalala' ) ;
        is( 'lal/ala', prefix_seperator_invertion( undef, 'lal/ala' ), 'prefix_seperator_invertion: lal/ala => lal/ala' ) ;
        is( 'lal.ala', prefix_seperator_invertion( undef, 'lal.ala' ), 'prefix_seperator_invertion: lal.ala => lal.ala' ) ;
        is( '////',    prefix_seperator_invertion( undef, '////' ),    'prefix_seperator_invertion: //// => ////' ) ;
        is( '.....',   prefix_seperator_invertion( undef, '.....' ),   'prefix_seperator_invertion: ..... => .....' ) ;

        my $mysync = {
                h1_prefix => '',
                h2_prefix => '',
                h1_sep    => '/',
                h2_sep    => '/',
        } ;

        is( q{},       prefix_seperator_invertion( $mysync, q{} ),       'prefix_seperator_invertion: $mysync empty string => empty string' ) ;
        is( 'lalala',  prefix_seperator_invertion( $mysync, 'lalala' ),  'prefix_seperator_invertion: $mysync lalala => lalala' ) ;
        is( 'lal/ala', prefix_seperator_invertion( $mysync, 'lal/ala' ), 'prefix_seperator_invertion: $mysync lal/ala => lal/ala' ) ;
        is( 'lal.ala', prefix_seperator_invertion( $mysync, 'lal.ala' ), 'prefix_seperator_invertion: $mysync lal.ala => lal.ala' ) ;
        is( '////',    prefix_seperator_invertion( $mysync, '////' ),    'prefix_seperator_invertion: $mysync //// => ////' ) ;
        is( '.....',   prefix_seperator_invertion( $mysync, '.....' ),   'prefix_seperator_invertion: $mysync ..... => .....' ) ;

        $mysync = {
                h1_prefix => 'PPP',
                h2_prefix => 'QQQ',
                h1_sep    => 's',
                h2_sep    => 't',
        } ;

        is( q{QQQ},       prefix_seperator_invertion( $mysync, q{} ),       'prefix_seperator_invertion: PPPQQQst empty string => QQQ' ) ;
        is( 'QQQlalala',  prefix_seperator_invertion( $mysync, 'lalala' ),  'prefix_seperator_invertion: PPPQQQst lalala => QQQlalala' ) ;
        is( 'QQQlal/ala', prefix_seperator_invertion( $mysync, 'lal/ala' ), 'prefix_seperator_invertion: PPPQQQst lal/ala => QQQlal/ala' ) ;
        is( 'QQQlal.ala', prefix_seperator_invertion( $mysync, 'lal.ala' ), 'prefix_seperator_invertion: PPPQQQst lal.ala => QQQlal.ala' ) ;
        is( 'QQQ////',    prefix_seperator_invertion( $mysync, '////' ),    'prefix_seperator_invertion: PPPQQQst //// => QQQ////' ) ;
        is( 'QQQ.....',   prefix_seperator_invertion( $mysync, '.....' ),   'prefix_seperator_invertion: PPPQQQst ..... => QQQ.....' ) ;

        is( 'QQQPlalala',  prefix_seperator_invertion( $mysync, 'PPPPlalala' ),  'prefix_seperator_invertion: PPPQQQst PPPPlalala => QQQPlalala' ) ;
        is( 'QQQ',         prefix_seperator_invertion( $mysync, 'PPP' ),         'prefix_seperator_invertion: PPPQQQst PPP => QQQ' ) ;
        is( 'QQQttt',      prefix_seperator_invertion( $mysync, 'sss' ),         'prefix_seperator_invertion: PPPQQQst sss => QQQttt' ) ;
        is( 'QQQt',        prefix_seperator_invertion( $mysync, 's' ),           'prefix_seperator_invertion: PPPQQQst s => QQQt' ) ;
        is( 'QQQtAAAtBBB', prefix_seperator_invertion( $mysync, 'PPPsAAAsBBB' ), 'prefix_seperator_invertion: PPPQQQst PPPsAAAsBBB => QQQtAAAtBBB' ) ;

        return ;
}

# Global variables to remove:
#  $h1_sep
#  $h2_sep
#  $debug

sub prefix_seperator_invertion {
        my $mysync  = shift ;
        my $h1_fold = shift ;
        my $h2_fold ;

        if ( not defined $h1_fold ) { return ; }

        my $my_h1_prefix = $mysync->{h1_prefix} || q{} ;
        my $my_h2_prefix = $mysync->{h2_prefix} || q{} ;
        my $my_h1_sep = $h1_sep || $mysync->{h1_sep} || '/' ;
        my $my_h2_sep = $h2_sep || $mysync->{h2_sep} || '/' ;

        # first we remove the prefix
        $h1_fold =~ s/^\Q$my_h1_prefix\E//x ;
        ( $debug or $mysync->{debugfolders} ) and myprint( "removed host1 prefix: [$h1_fold]\n" ) ;
        $h2_fold = separator_invert( $h1_fold, $my_h1_sep, $my_h2_sep ) ;
        ( $debug or $mysync->{debugfolders} ) and myprint( "inverted  separators: [$h2_fold]\n" ) ;

        # Adding the prefix supplied by namespace or the --prefix2 option
        $h2_fold = $my_h2_prefix . $h2_fold
          unless ( ( $my_h2_prefix eq 'INBOX' . $my_h2_sep ) and ( $h2_fold =~ m/^INBOX$/xi ) ) ;
        ( $debug or $mysync->{debugfolders} ) and myprint( "added   host2 prefix: [$h2_fold]\n" ) ;
        return ( $h2_fold ) ;
}

sub tests_separator_invert {
        note( 'Entering tests_separator_invert()' ) ;

        $fixslash2 = 0 ;
        ok( not( defined separator_invert() ),      'separator_invert: no args' ) ;
        ok( not( defined separator_invert( q{} ) ), 'separator_invert: not enough args' ) ;
        ok( not( defined separator_invert( q{}, q{} ) ), 'separator_invert: not enough args' ) ;

        ok( q{} eq separator_invert( q{}, q{}, q{} ), 'separator_invert: 3 empty strings' ) ;
        ok( 'lalala' eq separator_invert( 'lalala', q{}, q{} ), 'separator_invert: empty separator' ) ;
        ok( 'lalala' eq separator_invert( 'lalala', '/', '/' ), 'separator_invert: same separator /' ) ;
        ok( 'lal/ala' eq separator_invert( 'lal/ala', '/', '/' ), 'separator_invert: same separator / 2' ) ;
        ok( 'lal.ala' eq separator_invert( 'lal/ala', '/', '.' ), 'separator_invert: separators /.' ) ;
        ok( 'lal/ala' eq separator_invert( 'lal.ala', '.', '/' ), 'separator_invert: separators ./' ) ;
        ok( 'la.l/ala' eq separator_invert( 'la/l.ala', '.', '/' ), 'separator_invert: separators ./' ) ;

        ok( 'l/al.ala' eq separator_invert( 'l.al/ala', '/', '.' ), 'separator_invert: separators /.' ) ;
        $fixslash2 = 1 ;
        ok( 'l_al.ala' eq separator_invert( 'l.al/ala', '/', '.' ), 'separator_invert: separators /.' ) ;

        note( 'Leaving  tests_separator_invert()' ) ;
        return ;
}

# Global variables to remove:
# $fixslash2
sub separator_invert {
        my ( $h1_fold, $h1_separator, $h2_separator ) = @_ ;

        return ( undef ) if ( not defined $h1_fold or not defined $h1_separator or not defined $h2_separator ) ;

        # The separator we hope we'll never encounter: 00000000 == 0x00
        my $o_sep = "\000" ;

        my $h2_fold = $h1_fold ;
        $h2_fold =~ s,\Q$h2_separator,$o_sep,xg ;
        $h2_fold =~ s,\Q$h1_separator,$h2_separator,xg ;
        $h2_fold =~ s,\Q$o_sep,$h1_separator,xg ;
        $h2_fold =~ s,/,_,xg if ( $fixslash2 and '/' ne $h2_separator and '/' eq $h1_separator ) ;
        return ( $h2_fold ) ;
}

sub regextrans2 {
        my ( $h2_fold ) = @_ ;

        # Transforming the folder name by the --regextrans2 option(s)
        foreach my $regextrans2 ( @regextrans2 ) {
                my $h2_fold_before = $h2_fold ;
                my $ret            = eval "\$h2_fold =~ $regextrans2 ; 1 " ;
                ( $debug or $sync->{debugfolders} ) and myprint( "[$h2_fold_before] -> [$h2_fold] using regextrans2 [$regextrans2]\n" ) ;
                if ( not( defined $ret ) or $EVAL_ERROR ) {
                        die_clean( "error: eval regextrans2 '$regextrans2': $EVAL_ERROR\n" ) ;
                }
        }
        return ( $h2_fold ) ;
}

sub tests_decompose_regex {
        note( 'Entering tests_decompose_regex()' ) ;

        ok( 1, 'decompose_regex 1' ) ;
        ok( 0 == compare_lists( [ q{},  q{} ],    [ decompose_regex( q{} ) ] ),          'decompose_regex empty string' ) ;
        ok( 0 == compare_lists( [ '.*', 'lala' ], [ decompose_regex( 's/.*/lala/' ) ] ), 'decompose_regex s/.*/lala/' ) ;

        note( 'Leaving  tests_decompose_regex()' ) ;
        return ;
}

sub decompose_regex {
        my $regex = shift ;
        my ( $left_part, $right_part ) ;

        ( $left_part, $right_part ) = $regex =~ m{^s/((?:[^/]|\\/)+)/((?:[^/]|\\/)+)/}x ;
        return ( q{}, q{} ) if not $left_part ;
        return ( $left_part, $right_part ) ;
}

sub foldersizes {

        my ( $side, $imap, $search_cmd, $abletosearch, @folders ) = @_ ;
        my $total_size     = 0 ;
        my $total_nb       = 0 ;
        my $biggest_in_all = 0 ;

        my $nb_folders = scalar @folders ;
        my $ct_folders = 0 ;                 # folder counter.
        myprint( "++++ Calculating sizes of $nb_folders folders on $side\n" ) ;
        foreach my $folder ( @folders ) {
                my $stot    = 0 ;
                my $nb_msgs = 0 ;
                $ct_folders++ ;
                myprintf( "$side folder %7s %-35s", "$ct_folders/$nb_folders", jux_utf8( $folder ) ) ;
                if ( 'Host2' eq $side and not exists $h2_folders_all_UPPER{ uc $folder } ) {
                        myprint( " does not exist yet\n" ) ;
                        next ;
                }
                if ( 'Host1' eq $side and not exists $h1_folders_all{$folder} ) {
                        myprint( " does not exist\n" ) ;
                        next ;
                }

                last if $imap->IsUnconnected() ;

                # FTGate is RFC buggy with EXAMINE it does not act as SELECT
                #unless ( $imap->examine( $folder ) ) {
                unless ( $imap->select( $folder ) ) {
                        my $error = join q{}, "$side Folder $folder: Could not select: ", $imap->LastError, "\n" ;
                        errors_incr( $sync, $error ) ;
                        next ;
                }
                last if $imap->IsUnconnected() ;

                my $hash_ref = {} ;
                my @msgs = select_msgs( $imap, undef, $search_cmd, $abletosearch, $folder ) ;
                $nb_msgs = scalar @msgs ;
                my $biggest_in_folder = 0 ;
                @{$hash_ref}{@msgs} = ( undef ) if @msgs ;

                last if $imap->IsUnconnected() ;
                if ( $nb_msgs > 0 and @msgs ) {
                        if ( $abletosearch ) {
                                if ( !$imap->fetch_hash( \@msgs, 'RFC822.SIZE', $hash_ref ) ) {
                                        my $error = "$side failure with fetch_hash: $EVAL_ERROR" ;
                                        errors_incr( $sync, $error ) ;
                                        return ;
                                }
                        }
                        else {
                                my $uidnext         = $imap->uidnext( $folder ) || $uidnext_default ;
                                my $fetch_hash_uids = $fetch_hash_set           || "1:$uidnext" ;
                                if ( !$imap->fetch_hash( $fetch_hash_uids, 'RFC822.SIZE', $hash_ref ) ) {
                                        my $error = "$side failure with fetch_hash: $EVAL_ERROR" ;
                                        errors_incr( $sync, $error ) ;
                                        return ;
                                }
                        }
                        for ( keys %{$hash_ref} ) {
                                my $size = $hash_ref->{$_}->{'RFC822.SIZE'} ;
                                $stot += $size ;
                                $biggest_in_folder = max( $biggest_in_folder, $size ) ;
                        }
                }

                myprintf( ' Size: %9s',      $stot ) ;
                myprintf( ' Messages: %5s',  $nb_msgs ) ;
                myprintf( " Biggest: %9s\n", $biggest_in_folder ) ;
                $total_size += $stot ;
                $total_nb   += $nb_msgs ;
                $biggest_in_all = max( $biggest_in_all, $biggest_in_folder ) ;
        }
        myprintf( "%s Nb folders:      %11s folders\n",    $side, $nb_folders ) ;
        myprintf( "%s Nb messages:     %11s messages\n",   $side, $total_nb ) ;
        myprintf( "%s Total size:      %11s bytes (%s)\n", $side, $total_size, bytes_display_string( $total_size ) ) ;
        myprintf( "%s Biggest message: %11s bytes (%s)\n", $side, $biggest_in_all, bytes_display_string( $biggest_in_all ) ) ;
        myprintf( "%s Time spent:      %11.1f seconds\n",  $side, timenext() ) ;
        return ( $total_nb, $total_size ) ;
}

sub timenext {
        my ( $timenow, $timediff ) ;

        # $timebefore is global, beurk !
        $timenow    = time ;
        $timediff   = $timenow - $timebefore ;
        $timebefore = $timenow ;
        return ( $timediff ) ;
}

sub timesince {
        my $timeinit = shift || 0 ;
        my ( $timenow, $timediff ) ;
        $timenow  = time ;
        $timediff = $timenow - $timeinit ;

        # Often used in a division so no 0
        return ( max( 1, $timediff ) ) ;
}

sub tests_flags_regex {
        note( 'Entering tests_flags_regex()' ) ;

        ok( q{} eq flags_regex( q{} ),                                       'flags_regex, null string q{}' ) ;
        ok( q{\Seen NonJunk $Spam} eq flags_regex( q{\Seen NonJunk $Spam} ), q{flags_regex, nothing to do} ) ;

        @regexflag = ( 'I am BAD' ) ;
        ok( not( defined flags_regex( q{} ) ), 'flags_regex, bad regex' ) ;

        @regexflag = ( 's/NonJunk//g' ) ;
        ok( q{\Seen  $Spam} eq flags_regex( q{\Seen NonJunk $Spam} ), q{flags_regex, remove NonJunk: 's/NonJunk//g'} ) ;
        @regexflag = ( q's/\$Spam//g' ) ;
        ok( q{\Seen NonJunk } eq flags_regex( q{\Seen NonJunk $Spam} ), q{flags_regex, remove $Spam: 's/\$Spam//g'} ) ;

        @regexflag = ( 's/\\\\Seen//g' ) ;

        ok( q{ NonJunk $Spam} eq flags_regex( q{\Seen NonJunk $Spam} ), q{flags_regex, remove \Seen: 's/\\\\\\\\Seen//g'} ) ;

        @regexflag = ( 's/(\s|^)[^\\\\]\w+//g' ) ;
        ok( q{\Seen \Middle \End} eq flags_regex( q{\Seen NonJunk \Middle $Spam \End} ),              q{flags_regex: only \word among \Seen NonJunk \Middle $Spam \End} ) ;
        ok( q{ \Seen \Middle \End1} eq flags_regex( q{Begin \Seen NonJunk \Middle $Spam \End1 End} ), q{flags_regex: only \word among Begin \Seen NonJunk \Middle $Spam \End1 End} ) ;

        @regexflag = ( q{s/.*?(Keep1|Keep2|Keep3)/$1 /g} ) ;
        ok( 'Keep1 Keep2  ReB' eq flags_regex( 'ReA Keep1 REM Keep2 ReB' ), 'Keep only regex' ) ;

        ok( 'Keep1 Keep2 ' eq flags_regex( 'REM REM Keep1 Keep2' ),      'Keep only regex' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'Keep1 REM REM Keep2' ),      'Keep only regex' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'REM Keep1 REM REM  Keep2' ), 'Keep only regex' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'Keep1 Keep2' ),              'Keep only regex' ) ;
        ok( 'Keep1 ' eq flags_regex( 'REM Keep1' ),                      'Keep only regex' ) ;

        @regexflag = ( q{s/(Keep1|Keep2|Keep3) (?!(Keep1|Keep2|Keep3)).*/$1 /g} ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'Keep1 Keep2 ReB' ),          'Keep only regex' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'Keep1 Keep2 REM REM  REM' ), 'Keep only regex' ) ;
        ok( 'Keep2 ' eq flags_regex( 'Keep2 REM REM  REM' ),             'Keep only regex' ) ;

        @regexflag = ( q{s/.*?(Keep1|Keep2|Keep3)/$1 /g}, 's/(Keep1|Keep2|Keep3) (?!(Keep1|Keep2|Keep3)).*/$1 /g' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'REM Keep1 REM Keep2 REM' ),                     'Keep only regex' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'Keep1 REM Keep2 REM' ),                         'Keep only regex' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'REM Keep1 Keep2 REM' ),                         'Keep only regex' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'REM Keep1 REM Keep2' ),                         'Keep only regex' ) ;
        ok( 'Keep1 Keep2 Keep3 ' eq flags_regex( 'REM Keep1 REM Keep2 REM REM Keep3 REM' ), 'Keep only regex' ) ;
        ok( 'Keep1 ' eq flags_regex( 'REM  REM Keep1 REM REM REM ' ),                       'Keep only regex' ) ;
        ok( 'Keep1 Keep3 ' eq flags_regex( 'RE1 Keep1 RE2 Keep3 RE3 RE4 RE5 ' ),            'Keep only regex' ) ;

        @regexflag = ( 's/(.*)/$1 jrdH8u/' ) ;
        ok( 'REM  REM  REM REM REM jrdH8u' eq flags_regex( 'REM  REM  REM REM REM' ), q{Keep only regex 's/(.*)/\$1 jrdH8u/'} ) ;
        @regexflag = ( 's/jrdH8u *//' ) ;
        ok( 'REM  REM  REM REM REM ' eq flags_regex( 'REM  REM  REM REM REM jrdH8u' ), q{Keep only regex s/jrdH8u *//} ) ;

        @regexflag = ( 's/(.*)/$1 jrdH8u/', 's/.*?(Keep1|Keep2|Keep3|jrdH8u)/$1 /g', 's/(Keep1|Keep2|Keep3|jrdH8u) (?!(Keep1|Keep2|Keep3|jrdH8u)).*/$1 /g', 's/jrdH8u *//' ) ;

        ok( 'Keep1 Keep2 ' eq flags_regex( 'REM Keep1 REM Keep2 REM' ),                     q{Keep only regex 'REM Keep1 REM Keep2 REM'} ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'Keep1 REM Keep2 REM' ),                         'Keep only regex' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'REM Keep1 Keep2 REM' ),                         'Keep only regex' ) ;
        ok( 'Keep1 Keep2 ' eq flags_regex( 'REM Keep1 REM Keep2' ),                         'Keep only regex' ) ;
        ok( 'Keep1 Keep2 Keep3 ' eq flags_regex( 'REM Keep1 REM Keep2 REM REM Keep3 REM' ), 'Keep only regex' ) ;
        ok( 'Keep1 ' eq flags_regex( 'REM  REM Keep1 REM REM REM ' ),                       'Keep only regex' ) ;
        ok( 'Keep1 Keep3 ' eq flags_regex( 'RE1 Keep1 RE2 Keep3 RE3 RE4 RE5 ' ),            'Keep only regex' ) ;
        ok( q{} eq flags_regex( 'REM  REM REM REM REM' ),                                   'Keep only regex' ) ;

        @regexflag = ( 's/(.*)/$1 jrdH8u/', 's/.*?(\\\\Seen|\\\\Answered|\\\\Flagged|\\\\Deleted|\\\\Draft|jrdH8u)/$1 /g', 's/(\\\\Seen|\\\\Answered|\\\\Flagged|\\\\Deleted|\\\\Draft|jrdH8u) (?!(\\\\Seen|\\\\Answered|\\\\Flagged|\\\\Deleted|\\\\Draft|jrdH8u)).*/$1 /g', 's/jrdH8u *//' ) ;

        ok( '\\Deleted \\Answered ' eq flags_regex( 'Blabla $Junk \\Deleted machin \\Answered truc' ),                 'Keep only regex: Exchange case' ) ;
        ok( q{} eq flags_regex( q{} ),                                                                                 'Keep only regex: Exchange case, null string' ) ;
        ok( q{} eq flags_regex( 'Blabla $Junk  machin  truc' ),                                                        'Keep only regex: Exchange case, no accepted flags' ) ;
        ok( '\\Deleted \\Answered \\Draft \\Flagged ' eq flags_regex( '\\Deleted    \\Answered  \\Draft \\Flagged ' ), 'Keep only regex: Exchange case' ) ;

        @regexflag = ( 's/.*?(?:(\\\\(?:Answered|Flagged|Deleted|Seen|Draft)\s?)|$)/defined($1)?$1:q()/eg' ) ;

        ok( '\\Deleted \\Answered ' eq flags_regex( 'Blabla \$Junk \\Deleted machin \\Answered truc' ), 'Keep only regex: Exchange case (Phil)' ) ;

        ok( q{} eq flags_regex( q{} ), 'Keep only regex: Exchange case, null string (Phil)' ) ;

        ok( q{} eq flags_regex( 'Blabla $Junk  machin  truc' ), 'Keep only regex: Exchange case, no accepted flags (Phil)' ) ;

        ok( '\\Deleted \\Answered \\Draft \\Flagged ' eq flags_regex( '\\Deleted    \\Answered  \\Draft \\Flagged ' ), 'Keep only regex: Exchange case (Phil)' ) ;

        note( 'Leaving  tests_flags_regex()' ) ;
        return ;
}

sub flags_regex {
        my ( $h1_flags ) = @_ ;
        foreach my $regexflag ( @regexflag ) {
                my $h1_flags_orig = $h1_flags ;
                $debugflags and myprint( "eval \$h1_flags =~ $regexflag\n" ) ;
                my $ret = eval "\$h1_flags =~ $regexflag ; 1 " ;
                $debugflags and myprint( "regexflag $regexflag [$h1_flags_orig] -> [$h1_flags]\n" ) ;
                if ( not( defined $ret ) or $EVAL_ERROR ) {
                        myprint( "Error: eval regexflag '$regexflag': $EVAL_ERROR\n" ) ;
                        return ( undef ) ;
                }
        }
        return ( $h1_flags ) ;
}

sub acls_sync {
        my ( $h1_fold, $h2_fold ) = @_ ;
        if ( $syncacls ) {
                my $h1_hash = $imap1->getacl( $h1_fold )
                  or myprint( "Could not getacl for $h1_fold: $EVAL_ERROR\n" ) ;
                my $h2_hash = $imap2->getacl( $h2_fold )
                  or myprint( "Could not getacl for $h2_fold: $EVAL_ERROR\n" ) ;
                my %users = map { ( $_, 1 ) } ( keys %{$h1_hash}, keys %{$h2_hash} ) ;
                foreach my $user ( sort keys %users ) {
                        my $acl = $h1_hash->{$user} || 'none' ;
                        myprint( "acl $user: [$acl]\n" ) ;
                        next if (  $h1_hash->{$user}
                                && $h2_hash->{$user}
                                && $h1_hash->{$user} eq $h2_hash->{$user} ) ;
                        unless ( $sync->{dry} ) {
                                myprint( "setting acl $h2_fold $user $acl\n" ) ;
                                $imap2->setacl( $h2_fold, $user, $acl )
                                  or myprint( "Could not set acl: $EVAL_ERROR\n" ) ;
                        }
                }
        }
        return ;
}

sub tests_permanentflags {
        note( 'Entering tests_permanentflags()' ) ;

        my $string ;
        ok( q{} eq permanentflags( ' * OK [PERMANENTFLAGS (\* \Draft \Answered)] Limited' ),             'permanentflags \*' ) ;
        ok( '\Draft \Answered' eq permanentflags( ' * OK [PERMANENTFLAGS (\Draft \Answered)] Limited' ), 'permanentflags \Draft \Answered' ) ;
        ok( '\Draft \Answered' eq permanentflags( 'Blabla', ' * OK [PERMANENTFLAGS (\Draft \Answered)] Limited', 'Blabla' ), 'permanentflags \Draft \Answered' ) ;
        ok( q{} eq permanentflags( 'Blabla' ), 'permanentflags nothing' ) ;

        note( 'Leaving  tests_permanentflags()' ) ;
        return ;
}

sub permanentflags {
        my @lines = @_ ;

        foreach my $line ( @lines ) {
                if ( $line =~ m{\[PERMANENTFLAGS\s\(([^)]+?)\)\]}x ) {
                        ( $debugflags or $debug ) and myprint( "permanentflags: $line" ) ;
                        my $permanentflags = $1 ;
                        if ( $permanentflags =~ m{\\\*}x ) {
                                $permanentflags = q{} ;
                        }
                        return ( $permanentflags ) ;
                }
        }
        return ( q{} ) ;
}

sub tests_flags_filter {
        note( 'Entering tests_flags_filter()' ) ;

        ok( '\Seen' eq flags_filter( '\Seen', '\Draft \Seen \Answered' ), 'flags_filter ' ) ;
        ok( q{} eq flags_filter( '\Seen', '\Draft  \Answered' ), 'flags_filter ' ) ;
        ok( '\Seen' eq flags_filter( '\Seen', '\Seen' ),   'flags_filter ' ) ;
        ok( '\Seen' eq flags_filter( '\Seen', ' \Seen ' ), 'flags_filter ' ) ;
        ok( '\Seen \Draft' eq flags_filter( '\Seen \Draft', '\Draft \Seen \Answered' ),   'flags_filter ' ) ;
        ok( '\Seen \Draft' eq flags_filter( '\Seen \Draft', ' \Draft \Seen \Answered ' ), 'flags_filter ' ) ;

        note( 'Leaving  tests_flags_filter()' ) ;
        return ;
}

sub flags_filter {
        my ( $flags, $allowed_flags ) = @_ ;

        my @flags = split /\s+/x, $flags ;
        my %allowed_flags = map { $_ => 1 } split q{ }, $allowed_flags ;
        my @flags_out = map { exists $allowed_flags{$_} ? $_ : () } @flags ;

        my $flags_out = join q{ }, @flags_out ;

        return ( $flags_out ) ;
}

sub flagscase {
        my $flags = shift ;

        my @flags = split /\s+/x, $flags ;
        my %rfc_flags = map { $_ => 1 } split q{ }, '\Answered \Flagged \Deleted \Seen \Draft' ;
        my @flags_out = map { exists $rfc_flags{ ucsecond( lc $_ ) } ? ucsecond( lc $_ ) : $_ } @flags ;

        my $flags_out = join q{ }, @flags_out ;

        return ( $flags_out ) ;
}

sub tests_flagscase {
        note( 'Entering tests_flagscase()' ) ;

        ok( '\Seen' eq flagscase( '\Seen' ), 'flagscase: \Seen -> \Seen' ) ;
        ok( '\Seen' eq flagscase( '\SEEN' ), 'flagscase: \SEEN -> \Seen' ) ;

        ok( '\Seen \Draft' eq flagscase( '\SEEN \DRAFT' ), 'flagscase: \SEEN \DRAFT -> \Seen \Draft' ) ;
        ok( '\Draft \Seen' eq flagscase( '\DRAFT \SEEN' ), 'flagscase: \DRAFT \SEEN -> \Draft \Seen' ) ;

        ok( '\Draft LALA \Seen' eq flagscase( '\DRAFT  LALA \SEEN' ), 'flagscase: \DRAFT  LALA \SEEN -> \Draft LALA \Seen' ) ;
        ok( '\Draft lala \Seen' eq flagscase( '\DRAFT  lala \SEEN' ), 'flagscase: \DRAFT  lala \SEEN -> \Draft lala \Seen' ) ;

        note( 'Leaving  tests_flagscase()' ) ;
        return ;
}

sub ucsecond {
        my $string = shift ;
        my $output ;

        return ( $string ) if ( 1 >= length $string ) ;

        $output = ( substr( $string, 0, 1 ) ) . ( uc substr $string, 1, 1 ) . ( substr $string, 2 ) ;

        #myprint( "UUU $string -> $output\n"  ) ;
        return ( $output ) ;
}

sub tests_ucsecond {
        note( 'Entering tests_ucsecond()' ) ;
        ok( 'aBcde' eq ucsecond( 'abcde' ), 'ucsecond: abcde -> aBcde' ) ;
        ok( 'ABCDE' eq ucsecond( 'ABCDE' ), 'ucsecond: ABCDE -> ABCDE' ) ;
        ok( 'ABCDE' eq ucsecond( 'AbCDE' ), 'ucsecond: AbCDE -> ABCDE' ) ;
        ok( 'ABCde' eq ucsecond( 'AbCde' ), 'ucsecond: AbCde -> ABCde' ) ;
        ok( 'A' eq ucsecond( 'A' ),         'ucsecond: A  -> A' ) ;
        ok( 'AB' eq ucsecond( 'Ab' ),       'ucsecond: Ab -> AB' ) ;
        ok( '\B' eq ucsecond( '\b' ),       'ucsecond: \b -> \B' ) ;
        ok( '\Bcde' eq ucsecond( '\bcde' ), 'ucsecond: \bcde -> \Bcde' ) ;

        note( 'Leaving  tests_ucsecond()' ) ;
        return ;
}

sub select_msgs {
        my ( $imap, $msgs_all_hash_ref, $search_cmd, $abletosearch, $folder ) = @_ ;
        my ( @msgs ) ;

        if ( $abletosearch ) {
                @msgs = select_msgs_by_search( $imap, $msgs_all_hash_ref, $search_cmd, $folder ) ;
        }
        else {
                @msgs = select_msgs_by_fetch( $imap, $msgs_all_hash_ref, $search_cmd, $folder ) ;
        }
        return ( @msgs ) ;

}

sub select_msgs_by_search {
        my ( $imap, $msgs_all_hash_ref, $search_cmd, $folder ) = @_ ;
        my ( @msgs, @msgs_all ) ;

        # Need to have the whole list in msgs_all_hash_ref
        # without calling messages() several times.
        # Need all messages list to avoid deleting useful cache part
        # in case of --search or --minage or --maxage

        if (       ( defined $msgs_all_hash_ref and $usecache )
                or ( not defined $maxage and not defined $minage and not defined $search_cmd ) )
        {

                $debugdev and myprint( "Calling messages()\n" ) ;
                @msgs_all = $imap->messages() ;

                return if ( $#msgs_all == 0 && !defined $msgs_all[0] ) ;

                if ( defined $msgs_all_hash_ref ) {
                        @{$msgs_all_hash_ref}{@msgs_all} = () ;
                }

                # return all messages
                if ( not defined $maxage and not defined $minage and not defined $search_cmd ) {
                        return ( @msgs_all ) ;
                }
        }

        if ( defined $search_cmd ) {
                @msgs = $imap->search( $search_cmd ) ;
                return ( @msgs ) ;
        }

        # we are here only if $maxage or $minage is defined
        @msgs = select_msgs_by_age( $imap ) ;
        return ( @msgs ) ;
}

sub select_msgs_by_fetch {
        my ( $imap, $msgs_all_hash_ref, $search_cmd, $folder ) = @_ ;
        my ( @msgs, @msgs_all, %fetch ) ;

        # Need to have the whole list in msgs_all_hash_ref
        # without calling messages() several times.
        # Need all messages list to avoid deleting useful cache part
        # in case of --search or --minage or --maxage

        $debugdev and myprint( "Calling fetch_hash()\n" ) ;
        my $uidnext         = $imap->uidnext( $folder ) || $uidnext_default ;
        my $fetch_hash_uids = $fetch_hash_set           || "1:$uidnext" ;
        %fetch = %{ $imap->fetch_hash( $fetch_hash_uids, 'INTERNALDATE' ) } ;

        @msgs_all = sort { $a <=> $b } keys %fetch ;
        $debugdev and myprint( "Done fetch_hash()\n" ) ;

        return if ( $#msgs_all == 0 && !defined $msgs_all[0] ) ;

        if ( defined $msgs_all_hash_ref ) {
                @{$msgs_all_hash_ref}{@msgs_all} = () ;
        }

        # return all messages
        if ( not defined $maxage and not defined $minage and not defined $search_cmd ) {
                return ( @msgs_all ) ;
        }

        if ( defined $search_cmd ) {
                myprint( "Warning: strange to see --search with --noabletosearch, an error can happen\n" ) ;
                @msgs = $imap->search( $search_cmd ) ;
                return ( @msgs ) ;
        }

        # we are here only if $maxage or $minage is defined
        my ( @max, @min, $maxage_epoch, $minage_epoch ) ;
        if ( defined $maxage ) { $maxage_epoch = $timestart_int - $NB_SECONDS_IN_A_DAY * $maxage ; }
        if ( defined $minage ) { $minage_epoch = $timestart_int - $NB_SECONDS_IN_A_DAY * $minage ; }
        foreach my $msg ( @msgs_all ) {
                my $idate = $fetch{$msg}->{'INTERNALDATE'} ;

                #myprint( "$idate\n"  ) ;
                if ( defined $maxage and ( epoch( $idate ) >= $maxage_epoch ) ) {
                        push @max, $msg ;
                }
                if ( defined $minage and ( epoch( $idate ) <= $minage_epoch ) ) {
                        push @min, $msg ;
                }
        }
        @msgs = msgs_from_maxmin( \@max, \@min ) ;
        return ( @msgs ) ;
}

sub select_msgs_by_age {
        my ( $imap ) = @_ ;

        my ( @max, @min, @msgs, @inter, @union ) ;

        if ( defined $maxage ) {
                @max = $imap->sentsince( $timestart_int - $NB_SECONDS_IN_A_DAY * $maxage ) ;
        }
        if ( defined $minage ) {
                @min = $imap->sentbefore( $timestart_int - $NB_SECONDS_IN_A_DAY * $minage ) ;
        }

        @msgs = msgs_from_maxmin( \@max, \@min ) ;
        return ( @msgs ) ;
}

sub msgs_from_maxmin {
        my ( $max_ref, $min_ref ) = @_ ;
        my ( @max, @min, @msgs, @inter, @union ) ;

        @max = @{$max_ref} ;
        @min = @{$min_ref} ;

      SWITCH: {
                unless ( defined $minage ) { @msgs = @max ; last SWITCH }
                unless ( defined $maxage ) { @msgs = @min ; last SWITCH }
                my ( %union, %inter ) ;
                foreach my $m ( @min, @max ) { $union{$m}++ && $inter{$m}++ }
                @inter = sort { $a <=> $b } keys %inter ;
                @union = sort { $a <=> $b } keys %union ;

                # normal case
                if ( $minage <= $maxage ) { @msgs = @inter ; last SWITCH }

                # just exclude messages between
                if ( $minage > $maxage ) { @msgs = @union ; last SWITCH }

        }
        return ( @msgs ) ;
}

sub tests_msgs_from_maxmin {
        note( 'Entering tests_msgs_from_maxmin()' ) ;

        my @msgs ;
        $maxage = $NUMBER_200 ;
        @msgs = msgs_from_maxmin( [ '1', '2' ], [ '2', '3' ] ) ;
        ok( 0 == compare_lists( [ '1', '2' ], \@msgs ), 'msgs_from_maxmin: maxage++' ) ;
        $minage = $NUMBER_100 ;
        @msgs = msgs_from_maxmin( [ '1', '2' ], [ '2', '3' ] ) ;
        ok( 0 == compare_lists( ['2'], \@msgs ), 'msgs_from_maxmin:  -maxage++minage-' ) ;
        $minage = $NUMBER_300 ;
        @msgs = msgs_from_maxmin( [ '1', '2' ], [ '2', '3' ] ) ;
        ok( 0 == compare_lists( [ '1', '2', '3' ], \@msgs ), 'msgs_from_maxmin:  ++maxage-minage++' ) ;
        $maxage = undef ;
        @msgs = msgs_from_maxmin( [ '1', '2' ], [ '2', '3' ] ) ;
        ok( 0 == compare_lists( [ '2', '3' ], \@msgs ), 'msgs_from_maxmin:  ++minage-' ) ;

        note( 'Leaving  tests_msgs_from_maxmin()' ) ;
        return ;
}

sub tests_info_date_from_uid {

        return ;
}

sub info_date_from_uid {

        #my $first_uid   = $msgs_all[ 0 ] ;
        #my $first_idate = $fetch{ $first_uid }->{'INTERNALDATE'} ;
        #my $first_epoch = epoch( $first_idate ) ;
        #my $first_days  = ( $timestart_int - $first_epoch ) / $NB_SECONDS_IN_A_DAY ;
        #myprint( "\nOldest msg has UID $first_uid INTERNALDATE $first_idate EPOCH $first_epoch DAYS AGO $first_days\n" ) ;
}

sub lastuid {
        my $imap          = shift ;
        my $folder        = shift ;
        my $lastuid_guess = shift ;
        my $lastuid ;

        # rfc3501: The only reliable way to identify recent messages is to
        #          look at message flags to see which have the \Recent flag
        #          set, or to do a SEARCH RECENT.
        # SEARCH RECENT doesn't work this way on courrier.

        my @recent_messages ;

        # SEARCH RECENT for each transfer can be expensive with a big folder
        # Call commented for now
        #@recent_messages = $imap->recent(  ) ;
        #myprint( "Recent: @recent_messages\n" ) ;

        my $max_recent ;
        $max_recent = max( @recent_messages ) ;

        if ( defined $max_recent and ( $lastuid_guess <= $max_recent ) ) {
                $lastuid = $max_recent ;
        }
        else {
                $lastuid = $lastuid_guess;
        }
        return ( $lastuid ) ;
}

sub size_filtered {
        my ( $h1_size, $h1_msg, $h1_fold, $h2_fold ) = @_ ;

        $h1_size = 0 if ( !$h1_size ) ;    # null if empty or undef
        if ( defined $maxsize and $h1_size > $maxsize ) {
                myprint( "msg $h1_fold/$h1_msg skipped ($h1_size exceeds maxsize limit $maxsize bytes)\n" ) ;
                $total_bytes_skipped += $h1_size ;
                $nb_msg_skipped += 1 ;
                return ( 1 ) ;
        }
        if ( defined $minsize and $h1_size <= $minsize ) {
                myprint( "msg $h1_fold/$h1_msg skipped ($h1_size smaller than minsize $minsize bytes)\n" ) ;
                $total_bytes_skipped += $h1_size ;
                $nb_msg_skipped += 1 ;
                return ( 1 ) ;
        }
        return ( 0 ) ;
}

sub message_exists {
        my ( $imap, $msg ) = @_ ;
        return ( 1 ) if not $imap->Uid() ;

        my $search_uid ;
        ( $search_uid ) = $imap->search( "UID $msg" ) ;

        #myprint( "$search ? $msg\n"  ) ;
        return ( 1 ) if ( $search_uid eq $msg ) ;
        return ( 0 ) ;
}

sub copy_message {

        # copy

        my ( $mysync, $h1_msg, $h1_fold, $h2_fold, $h1_fir_ref, $permanentflags2, $cache_dir ) = @_ ;
        ( $debug or $mysync->{dry} ) and myprint( "msg $h1_fold/$h1_msg copying to $h2_fold $mysync->{dry_message}\n" ) ;

        my $h1_size  = $h1_fir_ref->{$h1_msg}->{'RFC822.SIZE'}  || 0 ;
        my $h1_flags = $h1_fir_ref->{$h1_msg}->{'FLAGS'}        || q{} ;
        my $h1_idate = $h1_fir_ref->{$h1_msg}->{'INTERNALDATE'} || q{} ;

        if ( size_filtered( $h1_size, $h1_msg, $h1_fold, $h2_fold ) ) {
                $h1_nb_msg_processed += 1 ;
                return ;
        }

        debugsleep( $mysync ) ;
        myprint( "- msg $h1_fold/$h1_msg S[$h1_size] F[$h1_flags] I[$h1_idate] has RFC822.SIZE null!\n" ) if ( !$h1_size ) ;

        if ( $checkmessageexists and not message_exists( $imap1, $h1_msg ) ) {
                $total_bytes_skipped += $h1_size ;
                $nb_msg_skipped      += 1 ;
                $h1_nb_msg_processed += 1 ;
                return ;
        }
        myprint( debugmemory( $sync, " at C1" ) ) ;

        my ( $string, $string_len ) ;
        ( $string_len ) = message_for_host2( $mysync, $h1_msg, $h1_fold, $h1_size, $h1_flags, $h1_idate, $h1_fir_ref, \$string ) ;

        myprint( debugmemory( $sync, " at C2" ) ) ;

        # not defined or empty $string
        if ( ( not $string ) or ( not $string_len ) ) {
                myprint( "- msg $h1_fold/$h1_msg skipped.\n" ) ;
                $total_bytes_skipped += $h1_size ;
                $nb_msg_skipped      += 1 ;
                $h1_nb_msg_processed += 1 ;
                return ;
        }

        # Lines too long (or not enough) => do no copy or fix
        if ( ( defined $maxlinelength ) or ( defined $minmaxlinelength ) ) {
                $string = linelengthstuff( $string, $h1_fold, $h1_msg, $string_len, $h1_size, $h1_flags, $h1_idate ) ;
                if ( not defined $string ) {
                        $h1_nb_msg_processed += 1 ;
                        $total_bytes_skipped += $h1_size ;
                        $nb_msg_skipped      += 1 ;
                        return ;
                }
        }

        my $h1_date = date_for_host2( $h1_msg, $h1_idate ) ;

        ( $debug or $debugflags )
          and myprint( "Host1 flags init msg $h1_fold/$h1_msg date [$h1_date] flags [$h1_flags] size [$h1_size]\n" ) ;

        $h1_flags = flags_for_host2( $h1_flags, $permanentflags2 ) ;

        ( $debug or $debugflags )
          and myprint( "Host1 flags filt msg $h1_fold/$h1_msg date [$h1_date] flags [$h1_flags] size [$h1_size]\n" ) ;

        $h1_date = undef if ( $h1_date eq q{} ) ;

        my $new_id = append_message_on_host2( \$string, $h1_fold, $h1_msg, $string_len, $h2_fold, $h1_size, $h1_flags, $h1_date, $cache_dir ) ;

        if ( $new_id and $syncflagsaftercopy ) {
                sync_flags_after_copy( $h1_fold, $h1_msg, $h1_flags, $h2_fold, $new_id, $permanentflags2 ) ;
        }

        myprint( debugmemory( $sync, " at C3" ) ) ;

        return $new_id ;
}

sub linelengthstuff {
        my ( $string, $h1_fold, $h1_msg, $string_len, $h1_size, $h1_flags, $h1_idate ) = @_ ;
        my $maxlinelength_string = max_line_length( $string ) ;
        $debugmaxlinelength and myprint( "msg $h1_fold/$h1_msg maxlinelength: $maxlinelength_string\n" ) ;

        if ( ( defined $minmaxlinelength ) and ( $maxlinelength_string <= $minmaxlinelength ) ) {
                my $subject = subject( $string ) ;
                $debugdev and myprint( "- msg $h1_fold/$h1_msg skipped S[$h1_size] F[$h1_flags] I[$h1_idate] " . "(Subject:[$subject]) (max line length under minmaxlinelength $minmaxlinelength bytes)\n" ) ;
                return ;
        }

        if ( ( defined $maxlinelength ) and ( $maxlinelength_string > $maxlinelength ) ) {
                my $subject = subject( $string ) ;
                if ( $maxlinelengthcmd ) {
                        $string = pipemess( $string, $maxlinelengthcmd ) ;

                        # string undef means something was bad.
                        if ( not( defined $string ) ) {
                                myprint( "- msg $h1_fold/$h1_msg {$string_len} S[$h1_size] F[$h1_flags] I[$h1_idate] " . "(Subject:[$subject]) could not be successfully transformed by --maxlinelengthcmd option\n" ) ;
                                return ;
                        }
                        else {
                                return $string ;
                        }
                }
                myprint( "- msg $h1_fold/$h1_msg skipped S[$h1_size] F[$h1_flags] I[$h1_idate] " . "(Subject:[$subject]) (line length exceeds maxlinelength $maxlinelength bytes)\n" ) ;
                return ;
        }
        return $string ;
}

sub message_for_host2 {

        # global variable list:
        # @skipmess
        # @regexmess
        # @pipemess
        # $debugcontent
        # $debug
        #
        # API current
        #
        # at failure:
        #   * return nothing ( will then be undef or () )
        #   * $string_ref content is undef or empty
        # at success:
        #   * return string length ($string_ref content length)
        #   * $string_ref content filled with message

        # API future
        #
        #
        my ( $mysync, $h1_msg, $h1_fold, $h1_size, $h1_flags, $h1_idate, $h1_fir_ref, $string_ref ) = @_ ;

        # abort when missing a parameter
        if ( ( !$sync ) or ( !$h1_msg ) or ( !$h1_fold ) or ( !$h1_size ) or ( !defined $h1_flags ) or ( !defined $h1_idate ) or ( !$h1_fir_ref ) or ( !$string_ref ) ) {
                return ;
        }

        myprint( debugmemory( $sync, " at M1" ) ) ;

        my $imap1 = $mysync->{imap1} ;
        my $string_ok = $imap1->message_to_file( $string_ref, $h1_msg ) ;

        myprint( debugmemory( $sync, " at M2" ) ) ;

        my $string_len = length_ref( $string_ref ) ;

        unless ( defined $string_ok and $string_len ) {

                # undef or 0 length
                my $error = join q{}, "- msg $h1_fold/$h1_msg {$string_len} S[$h1_size] F[$h1_flags] I[$h1_idate] could not be fetched: ", $imap1->LastError || q{}, "\n" ;
                errors_incr( $mysync, $error ) ;
                $total_bytes_error += $h1_size if ( $h1_size ) ;
                $h1_nb_msg_processed += 1 ;
                return ;
        }

        if ( @skipmess ) {
                my $match = skipmess( ${$string_ref} ) ;

                # string undef means the eval regex was bad.
                if ( not( defined $match ) ) {
                        myprint( "- msg $h1_fold/$h1_msg {$string_len} S[$h1_size] F[$h1_flags] I[$h1_idate]" . " could not be skipped by --skipmess option, bad regex\n" ) ;
                        return ;
                }
                if ( $match ) {
                        my $subject = subject( ${$string_ref} ) ;
                        myprint( "- msg $h1_fold/$h1_msg {$string_len} S[$h1_size] F[$h1_flags] I[$h1_idate]" . " (Subject:[$subject]) skipped by --skipmess\n" ) ;
                        return ;
                }
        }

        if ( @regexmess ) {
                ${$string_ref} = regexmess( ${$string_ref} ) ;

                # string undef means the eval regex was bad.
                if ( not( defined ${$string_ref} ) ) {
                        myprint( "- msg $h1_fold/$h1_msg {$string_len} S[$h1_size] F[$h1_flags] I[$h1_idate]" . " could not be transformed by --regexmess\n" ) ;
                        return ;
                }
        }

        if ( @pipemess ) {
                ${$string_ref} = pipemess( ${$string_ref}, @pipemess ) ;

                # string undef means something was bad.
                if ( not( defined ${$string_ref} ) ) {
                        myprint( "- msg $h1_fold/$h1_msg {$string_len} S[$h1_size] F[$h1_flags] I[$h1_idate]" . " could not be successfully transformed by --pipemess option\n" ) ;
                        return ;
                }
        }

        if ( $mysync->{addheader} and defined $h1_fir_ref->{$h1_msg}->{'NO_HEADER'} ) {
                my $header = add_header( $h1_msg ) ;
                $debug and myprint( "msg $h1_fold/$h1_msg adding custom header [$header]\n" ) ;
                ${$string_ref} = $header . "\r\n" . ${$string_ref} ;
        }

        $string_len = length_ref( $string_ref ) ;

        $debugcontent and myprint( q{=} x $STD_CHAR_PER_LINE, "\n", "F message content begin next line ($string_len characters long)\n", ${$string_ref}, "F message content ended on previous line\n", q{=} x $STD_CHAR_PER_LINE, "\n" ) ;

        myprint( debugmemory( $sync, " at M3" ) ) ;

        return $string_len ;
}

sub tests_message_for_host2 {
        note( 'Entering tests_message_for_host2()' ) ;

        my ( $mysync, $h1_msg, $h1_fold, $h1_size, $h1_flags, $h1_idate, $h1_fir_ref, $string_ref ) ;

        is( undef, message_for_host2(), q{message_for_host2: no args} ) ;
        is( undef, message_for_host2( $mysync, $h1_msg, $h1_fold, $h1_size, $h1_flags, $h1_idate, $h1_fir_ref, $string_ref ), q{message_for_host2: undef args} ) ;

        require Test::MockObject ;
        my $imapT = Test::MockObject->new() ;
        $mysync->{imap1} = $imapT ;
        my $string ;

        $h1_msg     = 1 ;
        $h1_fold    = 'FoldFoo' ;
        $h1_size    = 9 ;
        $h1_flags   = '' ;
        $h1_idate   = '10-Jul-2015 09:00:00 +0200' ;
        $h1_fir_ref = {} ;
        $string_ref = \$string ;
        $imapT->mock(
                'message_to_file',
                sub {
                        my ( $imap, $mystring_ref, $msg ) = @_ ;
                        ${$mystring_ref} = 'blablabla' ;
                        return length ${$mystring_ref} ;
                }
        ) ;
        is( 9, message_for_host2( $mysync, $h1_msg, $h1_fold, $h1_size, $h1_flags, $h1_idate, $h1_fir_ref, $string_ref ), q{message_for_host2: msg 1 == "blablabla", length} ) ;
        is( 'blablabla', $string, q{message_for_host2: msg 1 == "blablabla", value} ) ;

        # so far so good
        # now the --pipemess stuff

      SKIP: {
                Readonly my $NB_WIN_tests_message_for_host2 => 0 ;
                skip( 'Not on MSWin32', $NB_WIN_tests_message_for_host2 ) if ( 'MSWin32' ne $OSNAME ) ;

                # Windows
                # "type" command does not accept redirection of STDIN with <
                # "sort" does

        }

      SKIP: {
                Readonly my $NB_UNX_tests_message_for_host2 => 6 ;
                skip( 'Not on Unix', $NB_UNX_tests_message_for_host2 ) if ( 'MSWin32' eq $OSNAME ) ;

                # Unix

                # no change by cat
                @pipemess = ( 'cat' ) ;
                is( 9, message_for_host2( $mysync, $h1_msg, $h1_fold, $h1_size, $h1_flags, $h1_idate, $h1_fir_ref, $string_ref ), q{message_for_host2: --pipemess 'cat', length} ) ;
                is( 'blablabla', $string, q{message_for_host2: --pipemess 'cat', value} ) ;

                # failure by false
                @pipemess = ( 'false' ) ;
                is( undef, message_for_host2( $mysync, $h1_msg, $h1_fold, $h1_size, $h1_flags, $h1_idate, $h1_fir_ref, $string_ref ), q{message_for_host2: --pipemess 'false', length} ) ;
                is( undef, $string, q{message_for_host2: --pipemess 'false', value} ) ;

                # failure by true since no output
                @pipemess = ( 'true' ) ;
                is( undef, message_for_host2( $mysync, $h1_msg, $h1_fold, $h1_size, $h1_flags, $h1_idate, $h1_fir_ref, $string_ref ), q{message_for_host2: --pipemess 'true', length} ) ;
                is( undef, $string, q{message_for_host2: --pipemess 'true', value} ) ;
        }

        note( 'Leaving  tests_message_for_host2()' ) ;
        return ;
}

sub length_ref {
        my $string_ref = shift ;
        my $string_len = defined ${$string_ref} ? length( ${$string_ref} ) : q{} ;    # length or empty string
        return $string_len ;
}

sub tests_length_ref {
        note( 'Entering tests_length_ref()' ) ;

        my $notdefined ;
        is( q{}, length_ref( \$notdefined ), q{length_ref: value not defined} ) ;
        my $notref ;
        is( q{}, length_ref( $notref ), q{length_ref: param not a ref} ) ;

        my $lala = 'lala' ;
        is( 4, length_ref( \$lala ),  q{length_ref: lala length == 4} ) ;
        is( 4, length_ref( \'lili' ), q{length_ref: lili length == 4} ) ;

        note( 'Leaving  tests_length_ref()' ) ;
        return ;
}

sub date_for_host2 {
        my ( $h1_msg, $h1_idate ) = @_ ;

        my $h1_date = q{} ;

        if ( $syncinternaldates ) {
                $h1_date = $h1_idate ;
                $debug and myprint( "internal date from host1: [$h1_date]\n" ) ;
                $h1_date = good_date( $h1_date ) ;
                $debug and myprint( "internal date from host1: [$h1_date] (fixed)\n" ) ;
        }

        if ( $idatefromheader ) {
                $h1_date = $imap1->get_header( $h1_msg, 'Date' ) ;
                $debug and myprint( "header date from host1: [$h1_date]\n" ) ;
                $h1_date = good_date( $h1_date ) ;
                $debug and myprint( "header date from host1: [$h1_date] (fixed)\n" ) ;
        }

        return ( $h1_date ) ;
}

sub flags_for_host2 {
        my ( $h1_flags, $permanentflags2 ) = @_ ;

        # RFC 2060: This flag can not be altered by any client
        $h1_flags =~ s@\\Recent\s?@@xgi ;
        my $h1_flags_re ;
        if ( @regexflag and defined( $h1_flags_re = flags_regex( $h1_flags ) ) ) {
                $h1_flags = $h1_flags_re ;
        }
        $h1_flags = flagscase( $h1_flags ) if $flagscase ;
        $h1_flags = flags_filter( $h1_flags, $permanentflags2 ) if ( $permanentflags2 and $filterflags ) ;

        return ( $h1_flags ) ;
}

sub subject {
        my $string  = shift ;
        my $subject = q{} ;

        my $header = extract_header( $string ) ;

        if ( $header =~ m/^Subject:\s*([^\n\r]*)\r?$/msx ) {

                #myprint( "MMM[$1]\n"  ) ;
                $subject = $1 ;
        }
        return ( $subject ) ;
}

sub tests_subject {
        note( 'Entering tests_subject()' ) ;

        ok( q{} eq subject( q{} ),                                   'subject: null' ) ;
        ok( 'toto le hero' eq subject( 'Subject: toto le hero' ),    'subject: toto le hero' ) ;
        ok( 'toto le hero' eq subject( 'Subject:toto le hero' ),     'subject: toto le hero blank' ) ;
        ok( 'toto le hero' eq subject( "Subject:toto le hero\r\n" ), 'subject: toto le hero\r\n' ) ;

        my $MESS ;
        $MESS = <<'EOF';
From: lalala
Subject: toto le hero
Date: zzzzzz

Boogie boogie
EOF
        ok( 'toto le hero' eq subject( $MESS ), 'subject: toto le hero 2' ) ;

        $MESS = <<'EOF';
Subject: toto le hero
From: lalala
Date: zzzzzz

Boogie boogie
EOF
        ok( 'toto le hero' eq subject( $MESS ), 'subject: toto le hero 3' ) ;

        $MESS = <<'EOF';
From: lalala
Subject: cuicui
Date: zzzzzz

Subject: toto le hero
EOF
        ok( 'cuicui' eq subject( $MESS ), 'subject: cuicui' ) ;

        $MESS = <<'EOF';
From: lalala
Date: zzzzzz

Subject: toto le hero
EOF
        ok( q{} eq subject( $MESS ), 'subject: null but body could' ) ;

        note( 'Leaving  tests_subject()' ) ;
        return ;
}

# GlobVar
# $sync
# $max_msg_size_in_bytes
# $imap2
# $imap1
# $total_bytes_error
# $h1_nb_msg_processed
# $h2_uidguess
# ...
#
#
sub append_message_on_host2 {
        my ( $string_ref, $h1_fold, $h1_msg, $string_len, $h2_fold, $h1_size, $h1_flags, $h1_date, $cache_dir ) = @_ ;
        myprint( debugmemory( $sync, " at A1" ) ) ;

        my $new_id ;
        if ( !$sync->{dry} ) {
                $max_msg_size_in_bytes = max( $h1_size, $max_msg_size_in_bytes ) ;
                $new_id = $imap2->append_string( $h2_fold, ${$string_ref}, $h1_flags, $h1_date ) ;
                myprint( debugmemory( $sync, " at A2" ) ) ;
                if ( !$new_id ) {
                        my $subject    = subject( ${$string_ref} ) ;
                        my $error_imap = $imap2->LastError || q{} ;
                        my $error      = "- msg $h1_fold/$h1_msg {$string_len} could not append ( Subject:[$subject], Date:[$h1_date], Size:[$h1_size] ) to folder $h2_fold: $error_imap\n" ;
                        errors_incr( $sync, $error ) ;
                        $total_bytes_error   += $h1_size ;
                        $h1_nb_msg_processed += 1 ;
                        return ;
                }
                else {
                        # good
                        # $new_id is an id if the IMAP server has the
                        # UIDPLUS capability else just a ref
                        if ( $new_id !~ m{^\d+$}x ) {
                                $new_id = lastuid( $imap2, $h2_fold, $h2_uidguess ) ;
                        }
                        $h2_uidguess                     += 1 ;
                        $sync->{total_bytes_transferred} += $h1_size ;
                        $sync->{nb_msg_transferred}      += 1 ;
                        $h1_nb_msg_processed             += 1 ;

                        my $time_spent         = timesince( $sync->{begin_transfer_time} ) ;
                        my $rate               = bytes_display_string( $sync->{total_bytes_transferred} / $time_spent ) ;
                        my $eta                = eta( $time_spent, $h1_nb_msg_processed, $h1_nb_msg_start, $sync->{nb_msg_transferred} ) ;
                        my $amount_transferred = bytes_display_string( $sync->{total_bytes_transferred} ) ;
                        myprintf( "msg %s/%-19s copied to %s/%-10s %.2f msgs/s  %s/s %s copied  %s\n", $h1_fold, "$h1_msg {$string_len}", $h2_fold, $new_id, $sync->{nb_msg_transferred} / $time_spent, $rate, $amount_transferred, $eta ) ;
                        sleep_if_needed( $sync ) ;
                        if ( $usecache and $cacheaftercopy and $new_id =~ m{^\d+$}x ) {
                                $debugcache and myprint( "touch $cache_dir/${h1_msg}_$new_id\n" ) ;
                                touch( "$cache_dir/${h1_msg}_$new_id" )
                                  or croak( "Couldn't touch $cache_dir/${h1_msg}_$new_id" ) ;
                        }
                        if ( $delete1 ) {
                                delete_message_on_host1( $h1_msg, $h1_fold ) ;
                        }

                        #myprint( "PRESS ENTER" ) and my $a = <> ;
                        return ( $new_id ) ;
                }
        }
        else {
                $nb_msg_skipped_dry_mode += 1 ;
                $h1_nb_msg_processed     += 1 ;
        }

        return ;
}

sub tests_sleep_if_needed {
        note( 'Entering tests_sleep_if_needed()' ) ;

        is( undef, sleep_if_needed(), 'sleep_if_needed: no args => undef' ) ;
        my $mysync ;
        is( undef, sleep_if_needed( $mysync ), 'sleep_if_needed: arg undef => undef' ) ;

        $mysync->{maxbytespersecond} = 1000 ;
        is( 0, sleep_if_needed( $mysync ), 'sleep_if_needed: maxbytespersecond only => no sleep => 0' ) ;
        $mysync->{begin_transfer_time} = time ;    # now
        is( 0, sleep_if_needed( $mysync ), 'sleep_if_needed: begin_transfer_time now => no sleep => 0' ) ;
        $mysync->{begin_transfer_time} = time - 2 ;    # 2 s before
        is( 0, sleep_if_needed( $mysync ), 'sleep_if_needed: total_bytes_transferred == 0 => no sleep => 0' ) ;

        $mysync->{total_bytes_transferred} = 2200 ;
        $mysync->{begin_transfer_time}     = time - 2 ;    # 2 s before
        is( '0.20', sleep_if_needed( $mysync ), 'sleep_if_needed: total_bytes_transferred == 2200 since 2s => sleep 0.2s' ) ;
        is( '0',    sleep_if_needed( $mysync ), 'sleep_if_needed: total_bytes_transferred == 2200 since 2+2 == 4s => no sleep' ) ;

        $mysync->{maxsleep}            = 0.1 ;
        $mysync->{begin_transfer_time} = time - 2 ;        # 2 s before again
        is( '0.10', sleep_if_needed( $mysync ), 'sleep_if_needed: total_bytes_transferred == 4000 since 2s but maxsleep 0.1s => sleep 0.1s' ) ;

        $mysync->{maxbytesafter}       = 4000 ;
        $mysync->{begin_transfer_time} = time - 2 ;        # 2 s before again
        is( 0, sleep_if_needed( $mysync ), 'sleep_if_needed: maxbytesafter == total_bytes_transferred => no sleep => 0' ) ;

        note( 'Leaving  tests_sleep_if_needed()' ) ;
        return ;
}

sub sleep_if_needed {
        my ( $mysync ) = shift ;

        if ( !$mysync ) {
                return ;
        }

        # No need to go further if there is no limit set
        if (
                not(       $mysync->{maxmessagespersecond}
                        or $mysync->{maxbytespersecond} )
          )
        {
                return ;
        }

        $mysync->{maxsleep} = defined $mysync->{maxsleep} ? $mysync->{maxsleep} : $MAX_SLEEP ;

        my $time_spent = timesince( $mysync->{begin_transfer_time} ) ;
        my $sleep_max_messages = sleep_max_messages( $mysync->{nb_msg_transferred}, $time_spent, $mysync->{maxmessagespersecond} ) ;

        my $maxbytesafter           = $mysync->{maxbytesafter}           || 0 ;
        my $total_bytes_transferred = $mysync->{total_bytes_transferred} || 0 ;
        my $total_bytes_to_consider = $total_bytes_transferred - $maxbytesafter ;

        #myprint( "maxbytesafter:$maxbytesafter\n" ) ;
        #myprint( "total_bytes_to_consider:$total_bytes_to_consider\n" ) ;

        my $sleep_max_bytes = sleep_max_bytes( $total_bytes_to_consider, $time_spent, $mysync->{maxbytespersecond} ) ;
        my $sleep_max = min( $mysync->{maxsleep}, max( $sleep_max_messages, $sleep_max_bytes ) ) ;
        $sleep_max = mysprintf( "%.2f", $sleep_max ) ;    # round with 2 decimals.
        if ( $sleep_max > 0 ) {
                myprint( "sleeping $sleep_max s\n" ) ;
                sleep $sleep_max ;

                # Slept
                return $sleep_max ;
        }

        # No sleep
        return 0 ;
}

sub sleep_max_messages {

        # how long we have to sleep to go under max_messages_per_second
        my ( $nb_msg_transferred, $time_spent, $maxmessagespersecond ) = @_ ;
        if ( ( not defined $maxmessagespersecond ) or $maxmessagespersecond <= 0 ) { return ( 0 ) }
        my $sleep = ( $nb_msg_transferred / $maxmessagespersecond ) - $time_spent ;

        # the sleep must be positive
        return ( max( 0, $sleep ) ) ;
}

sub tests_sleep_max_messages {
        note( 'Entering tests_sleep_max_messages()' ) ;

        ok( 0 == sleep_max_messages( 4, 2, undef ),      'sleep_max_messages: maxmessagespersecond = undef' ) ;
        ok( 0 == sleep_max_messages( 4, 2, 0 ),          'sleep_max_messages: maxmessagespersecond = 0' ) ;
        ok( 0 == sleep_max_messages( 4, 2, $MINUS_ONE ), 'sleep_max_messages: maxmessagespersecond = -1' ) ;
        ok( 0 == sleep_max_messages( 4, 2, 2 ),          'sleep_max_messages: maxmessagespersecond = 2 max reached' ) ;
        ok( 2 == sleep_max_messages( 8, 2, 2 ),          'sleep_max_messages: maxmessagespersecond = 2 max over' ) ;
        ok( 0 == sleep_max_messages( 2, 2, 2 ),          'sleep_max_messages: maxmessagespersecond = 2 max not reached' ) ;

        note( 'Leaving  tests_sleep_max_messages()' ) ;
        return ;
}

sub sleep_max_bytes {

        # how long we have to sleep to go under max_bytes_per_second
        my ( $total_bytes_to_consider, $time_spent, $maxbytespersecond ) = @_ ;
        $total_bytes_to_consider ||= 0 ;
        $time_spent              ||= 0 ;

        if ( ( not defined $maxbytespersecond ) or $maxbytespersecond <= 0 ) { return ( 0 ) }

        #myprint( "total_bytes_to_consider:$total_bytes_to_consider\n" ) ;
        my $sleep = ( $total_bytes_to_consider / $maxbytespersecond ) - $time_spent ;

        # the sleep must be positive
        return ( max( 0, $sleep ) ) ;
}

sub tests_sleep_max_bytes {
        note( 'Entering tests_sleep_max_bytes()' ) ;

        ok( 0 == sleep_max_bytes( 4000,  2, undef ),      'sleep_max_bytes: maxbytespersecond == undef => sleep 0' ) ;
        ok( 0 == sleep_max_bytes( 4000,  2, 0 ),          'sleep_max_bytes: maxbytespersecond = 0 => sleep 0' ) ;
        ok( 0 == sleep_max_bytes( 4000,  2, $MINUS_ONE ), 'sleep_max_bytes: maxbytespersecond = -1 => sleep 0' ) ;
        ok( 0 == sleep_max_bytes( 4000,  2, 2000 ),       'sleep_max_bytes: maxbytespersecond = 2k max reached sharp => sleep 0' ) ;
        ok( 2 == sleep_max_bytes( 8000,  2, 2000 ),       'sleep_max_bytes: maxbytespersecond = 2k max over => sleep a little' ) ;
        ok( 0 == sleep_max_bytes( -8000, 2, 2000 ),       'sleep_max_bytes: maxbytespersecond = 2k max not reached => sleep 0' ) ;
        ok( 0 == sleep_max_bytes( 2000,  2, 2000 ),       'sleep_max_bytes: maxbytespersecond = 2k max not reached => sleep 0' ) ;
        ok( 0 == sleep_max_bytes( -2000, 2, 1000 ),       'sleep_max_bytes: maxbytespersecond = 1k max not reached => sleep 0' ) ;

        note( 'Leaving  tests_sleep_max_bytes()' ) ;
        return ;
}

# 6 GlobVar: $sync $imap1 $h1_nb_msg_deleted  $expunge1
sub delete_message_on_host1 {
        my ( $h1_msg, $h1_fold ) = @_ ;
        my $expunge_message = q{} ;
        $expunge_message = 'and expunged' if ( $expungeaftereach and $expunge1 ) ;
        myprint( "Host1 msg $h1_fold/$h1_msg marked deleted $expunge_message $sync->{dry_message}\n" ) ;
        if ( !$sync->{dry} ) {
                $imap1->delete_message( $h1_msg ) ;
                $h1_nb_msg_deleted += 1 ;
                $imap1->expunge() if ( $expungeaftereach and $expunge1 ) ;
        }
        return ;
}

sub eta {
        my ( $my_time_spent, $h1_nb_processed, $my_h1_nb_msg_start, $nb_transferred ) = @_ ;
        return ( q{} ) if not $foldersizes ;

        my $time_remaining   = time_remaining( $my_time_spent, $h1_nb_processed, $my_h1_nb_msg_start, $nb_transferred ) ;
        my $nb_msg_remaining = $my_h1_nb_msg_start - $h1_nb_processed ;
        my $eta_date         = localtime( time + $time_remaining ) ;
        return ( mysprintf( 'ETA: %s  %1.0f s  %s/%s msgs left', $eta_date, $time_remaining, $nb_msg_remaining, $my_h1_nb_msg_start ) ) ;
}

sub time_remaining {

        my ( $my_time_spent, $h1_nb_processed, $my_h1_nb_msg_start, $nb_transferred ) = @_ ;

        my $time_remaining = ( $my_time_spent / $nb_transferred ) * ( $my_h1_nb_msg_start - $h1_nb_processed ) ;
        return ( $time_remaining ) ;
}

sub tests_time_remaining {
        note( 'Entering tests_time_remaining()' ) ;

        ok( 1 == time_remaining( 1, 1, 2,  1 ), 'time_remaining: 1, 1, 2, 1 -> 1' ) ;
        ok( 1 == time_remaining( 9, 9, 10, 9 ), 'time_remaining: 9, 9, 10, 9 -> 1' ) ;
        ok( 9 == time_remaining( 1, 1, 10, 1 ), 'time_remaining: 1, 1, 10, 1 -> 1' ) ;

        note( 'Leaving  tests_time_remaining()' ) ;
        return ;
}

sub cache_map {
        my ( $cache_files_ref, $h1_msgs_ref, $h2_msgs_ref ) = @_ ;
        my ( %map1_2, %map2_1, %done2 ) ;

        my $h1_msgs_hash_ref = {} ;
        my $h2_msgs_hash_ref = {} ;

        @{$h1_msgs_hash_ref}{ @{$h1_msgs_ref} } = () ;
        @{$h2_msgs_hash_ref}{ @{$h2_msgs_ref} } = () ;

        foreach my $file ( sort @{$cache_files_ref} ) {
                $debugcache and myprint( "C12: $file\n" ) ;
                ( $uid1, $uid2 ) = match_a_cache_file( $file ) ;

                if (        exists( $h1_msgs_hash_ref->{ defined $uid1 ? $uid1 : q{} } )
                        and exists( $h2_msgs_hash_ref->{ defined $uid2 ? $uid2 : q{} } ) )
                {
                        # keep only the greatest uid2
                        # 130_2301 and
                        # 130_231  => keep only 130 -> 2301

                        # keep only the greatest uid1
                        # 1601_260 and
                        #  161_260 => keep only 1601 -> 260
                        my $max_uid2 = max( $uid2, $map1_2{$uid1} || $MINUS_ONE ) ;
                        if ( exists $done2{$max_uid2} ) {
                                if ( $done2{$max_uid2} < $uid1 ) {
                                        $map1_2{$uid1} = $max_uid2 ;
                                        delete $map1_2{ $done2{$max_uid2} } ;
                                        $done2{$max_uid2} = $uid1 ;
                                }
                        }
                        else {
                                $map1_2{$uid1}    = $max_uid2 ;
                                $done2{$max_uid2} = $uid1 ;
                        }
                }

        }
        %map2_1 = reverse %map1_2 ;
        return ( \%map1_2, \%map2_1 ) ;
}

sub tests_cache_map {
        note( 'Entering tests_cache_map()' ) ;

        #$debugcache = 1 ;
        my @cache_files = qw (
          100_200
          101_201
          120_220
          142_242
          143_243
          177_277
          177_278
          177_279
          155_255
          180_280
          181_280
          182_280
          130_231
          130_2301
          161_260
          1601_260
          ) ;

        my $msgs_1 = [ 120, 142, 143, 144, 161, 1601, 177, 182, 130 ] ;
        my $msgs_2 = [ 242, 243, 260, 299, 377, 279, 255, 280, 231, 2301 ] ;

        my ( $c12, $c21 ) ;
        ok( ( $c12, $c21 ) = cache_map( \@cache_files, $msgs_1, $msgs_2 ), 'cache_map: 02' ) ;
        my $a1 = [ sort { $a <=> $b } keys %{$c12} ] ;
        my $a2 = [ sort { $a <=> $b } keys %{$c21} ] ;
        ok( 0 == compare_lists( [ 130, 142, 143, 177, 182, 1601 ], $a1 ), 'cache_map: 03' ) ;
        ok( 0 == compare_lists( [ 242, 243, 260, 279, 280, 2301 ], $a2 ), 'cache_map: 04' ) ;
        ok( !$c12->{161},        'cache_map: ! 161 ->  260' ) ;
        ok( 260 == $c12->{1601}, 'cache_map:  1601 ->  260' ) ;
        ok( 2301 == $c12->{130}, 'cache_map:   130 -> 2301' ) ;

        #myprint( $c12->{1601}, "\n" ) ;

        note( 'Leaving  tests_cache_map()' ) ;
        return ;

}

sub cache_dir_fix {
        my $cache_dir = shift ;
        $cache_dir =~ s/([;<>\*\|`&\$!#\(\)\[\]\{\}:'"\\])/\\$1/xg ;

        #myprint( "cache_dir_fix: $cache_dir\n"  ) ;
        return ( $cache_dir ) ;
}

sub tests_cache_dir_fix {
        note( 'Entering tests_cache_dir_fix()' ) ;

        ok( 'lalala' eq cache_dir_fix( 'lalala' ),         'cache_dir_fix: lalala -> lalala' ) ;
        ok( 'ii\\\\ii' eq cache_dir_fix( 'ii\ii' ),        'cache_dir_fix: ii\ii -> ii\\\\ii' ) ;
        ok( 'ii@ii' eq cache_dir_fix( 'ii@ii' ),           'cache_dir_fix: ii@ii -> ii@ii' ) ;
        ok( 'ii@ii\\:ii' eq cache_dir_fix( 'ii@ii:ii' ),   'cache_dir_fix: ii@ii:ii -> ii@ii\\:ii' ) ;
        ok( 'i\\\\i\\\\ii' eq cache_dir_fix( 'i\i\ii' ),   'cache_dir_fix: i\i\ii -> i\\\\i\\\\ii' ) ;
        ok( 'i\\\\ii' eq cache_dir_fix( 'i\\ii' ),         'cache_dir_fix: i\\ii -> i\\\\\\\\ii' ) ;
        ok( '\\\\ ' eq cache_dir_fix( '\\ ' ),             'cache_dir_fix: \\  -> \\\\\ ' ) ;
        ok( '\\\\ ' eq cache_dir_fix( '\ ' ),              'cache_dir_fix: \  -> \\\\\ ' ) ;
        ok( '\[bracket\]' eq cache_dir_fix( '[bracket]' ), 'cache_dir_fix: [bracket] -> \[bracket\]' ) ;

        note( 'Leaving  tests_cache_dir_fix()' ) ;
        return ;
}

sub cache_dir_fix_win {
        my $cache_dir = shift ;
        $cache_dir =~ s/(\[|\])/[$1]/xg ;

        #myprint( "cache_dir_fix_win: $cache_dir\n"  ) ;
        return ( $cache_dir ) ;
}

sub tests_cache_dir_fix_win {
        note( 'Entering tests_cache_dir_fix_win()' ) ;

        ok( 'lalala' eq cache_dir_fix_win( 'lalala' ),           'cache_dir_fix_win: lalala -> lalala' ) ;
        ok( '[[]bracket[]]' eq cache_dir_fix_win( '[bracket]' ), 'cache_dir_fix_win: [bracket] -> [[]bracket[]]' ) ;

        note( 'Leaving  tests_cache_dir_fix_win()' ) ;
        return ;
}

sub get_cache {
        my ( $cache_dir, $h1_msgs_ref, $h2_msgs_ref, $h1_msgs_all_hash_ref, $h2_msgs_all_hash_ref ) = @_ ;

        $debugcache and myprint( "Entering get_cache\n" ) ;

        -d $cache_dir or return ( undef ) ;    # exit if cache directory doesn't exist
        $debugcache and myprint( "cache_dir    : $cache_dir\n" ) ;

        if ( 'MSWin32' ne $OSNAME ) {
                $cache_dir = cache_dir_fix( $cache_dir ) ;
        }
        else {
                $cache_dir = cache_dir_fix_win( $cache_dir ) ;
        }

        $debugcache and myprint( "cache_dir_fix: $cache_dir\n" ) ;

        my @cache_files = bsd_glob( "$cache_dir/*" ) ;

        #$debugcache and myprint( "cache_files: [@cache_files]\n"  ) ;

        $debugcache and myprint( 'cache_files: ', scalar @cache_files, " files found\n" ) ;

        my ( $cache_1_2_ref, $cache_2_1_ref ) = cache_map( \@cache_files, $h1_msgs_ref, $h2_msgs_ref ) ;

        clean_cache( \@cache_files, $cache_1_2_ref, $h1_msgs_all_hash_ref, $h2_msgs_all_hash_ref ) ;

        $debugcache and myprint( "Exiting get_cache\n" ) ;
        return ( $cache_1_2_ref, $cache_2_1_ref ) ;
}

sub tests_get_cache {
        note( 'Entering tests_get_cache()' ) ;

        ok( not( get_cache( '/cache_no_exist' ) ), 'get_cache: /cache_no_exist' ) ;
        ok( ( not -d 'W/tmp/cache/F1/F2' or rmtree( 'W/tmp/cache/F1/F2' ) ), 'get_cache: rmtree W/tmp/cache/F1/F2' ) ;
        ok( mkpath( 'W/tmp/cache/F1/F2' ), 'get_cache: mkpath W/tmp/cache/F1/F2' ) ;

        my @test_files_cache = (
                qw(
                  W/tmp/cache/F1/F2/100_200
                  W/tmp/cache/F1/F2/101_201
                  W/tmp/cache/F1/F2/120_220
                  W/tmp/cache/F1/F2/142_242
                  W/tmp/cache/F1/F2/143_243
                  W/tmp/cache/F1/F2/177_277
                  W/tmp/cache/F1/F2/177_377
                  W/tmp/cache/F1/F2/177_777
                  W/tmp/cache/F1/F2/155_255
                  )
        ) ;
        ok( touch( @test_files_cache ), 'get_cache: touch W/tmp/cache/F1/F2/...' ) ;

        # on cache: 100_200 101_201 142_242 143_243 177_277 177_377 177_777 155_255
        # on live:
        my $msgs_1 = [ 120, 142, 143, 144, 177 ] ;
        my $msgs_2 = [ 242, 243, 299, 377, 777, 255 ] ;

        my $msgs_all_1 = { 120 => 0, 142 => 0, 143 => 0, 144 => 0, 177 => 0 } ;
        my $msgs_all_2 = { 242 => 0, 243 => 0, 299 => 0, 377 => 0, 777 => 0, 255 => 0 } ;

        my ( $c12, $c21 ) ;
        ok( ( $c12, $c21 ) = get_cache( 'W/tmp/cache/F1/F2', $msgs_1, $msgs_2, $msgs_all_1, $msgs_all_2 ), 'get_cache: 02' ) ;
        my $a1 = [ sort { $a <=> $b } keys %{$c12} ] ;
        my $a2 = [ sort { $a <=> $b } keys %{$c21} ] ;
        ok( 0 == compare_lists( [ 142, 143, 177 ], $a1 ), 'get_cache: 03' ) ;
        ok( 0 == compare_lists( [ 242, 243, 777 ], $a2 ), 'get_cache: 04' ) ;
        ok( -f 'W/tmp/cache/F1/F2/142_242',  'get_cache: file kept 142_242' ) ;
        ok( -f 'W/tmp/cache/F1/F2/142_242',  'get_cache: file kept 143_243' ) ;
        ok( !-f 'W/tmp/cache/F1/F2/100_200', 'get_cache: file removed 100_200' ) ;
        ok( !-f 'W/tmp/cache/F1/F2/101_201', 'get_cache: file removed 101_201' ) ;

        # test clean_cache executed
        $maxage = 2 ;
        ok( touch( @test_files_cache ), 'get_cache: touch W/tmp/cache/F1/F2/...' ) ;
        ok( ( $c12, $c21 ) = get_cache( 'W/tmp/cache/F1/F2', $msgs_1, $msgs_2, $msgs_all_1, $msgs_all_2 ), 'get_cache: 02' ) ;
        ok( -f 'W/tmp/cache/F1/F2/142_242',  'get_cache: file kept 142_242' ) ;
        ok( -f 'W/tmp/cache/F1/F2/142_242',  'get_cache: file kept 143_243' ) ;
        ok( !-f 'W/tmp/cache/F1/F2/100_200', 'get_cache: file NOT removed 100_200' ) ;
        ok( !-f 'W/tmp/cache/F1/F2/101_201', 'get_cache: file NOT removed 101_201' ) ;

        # strange files
        #$debugcache = 1 ;
        $maxage = undef ;
        ok( ( not -d 'W/tmp/cache/rr\uee' or rmtree( 'W/tmp/cache/rr\uee' ) ), 'get_cache: rmtree W/tmp/cache/rr\uee' ) ;
        ok( mkpath( 'W/tmp/cache/rr\uee' ), 'get_cache: mkpath W/tmp/cache/rr\uee' ) ;

        @test_files_cache = (
                qw(
                  W/tmp/cache/rr\uee/100_200
                  W/tmp/cache/rr\uee/101_201
                  W/tmp/cache/rr\uee/120_220
                  W/tmp/cache/rr\uee/142_242
                  W/tmp/cache/rr\uee/143_243
                  W/tmp/cache/rr\uee/177_277
                  W/tmp/cache/rr\uee/177_377
                  W/tmp/cache/rr\uee/177_777
                  W/tmp/cache/rr\uee/155_255
                  )
        ) ;
        ok( touch( @test_files_cache ), 'get_cache: touch strange W/tmp/cache/...' ) ;

        # on cache: 100_200 101_201 142_242 143_243 177_277 177_377 177_777 155_255
        # on live:
        $msgs_1 = [ 120, 142, 143, 144, 177 ] ;
        $msgs_2 = [ 242, 243, 299, 377, 777, 255 ] ;

        $msgs_all_1 = { 120 => q{}, 142 => q{}, 143 => q{}, 144 => q{}, 177 => q{} } ;
        $msgs_all_2 = { 242 => q{}, 243 => q{}, 299 => q{}, 377 => q{}, 777 => q{}, 255 => q{} } ;

        ok( ( $c12, $c21 ) = get_cache( 'W/tmp/cache/rr\uee', $msgs_1, $msgs_2, $msgs_all_1, $msgs_all_2 ), 'get_cache: strange path 02' ) ;
        $a1 = [ sort { $a <=> $b } keys %{$c12} ] ;
        $a2 = [ sort { $a <=> $b } keys %{$c21} ] ;
        ok( 0 == compare_lists( [ 142, 143, 177 ], $a1 ), 'get_cache: strange path 03' ) ;
        ok( 0 == compare_lists( [ 242, 243, 777 ], $a2 ), 'get_cache: strange path 04' ) ;
        ok( -f 'W/tmp/cache/rr\uee/142_242',  'get_cache: strange path file kept 142_242' ) ;
        ok( -f 'W/tmp/cache/rr\uee/142_242',  'get_cache: strange path file kept 143_243' ) ;
        ok( !-f 'W/tmp/cache/rr\uee/100_200', 'get_cache: strange path file removed 100_200' ) ;
        ok( !-f 'W/tmp/cache/rr\uee/101_201', 'get_cache: strange path file removed 101_201' ) ;

        note( 'Leaving  tests_get_cache()' ) ;
        return ;
}

sub match_a_cache_file {
        my $file = shift ;
        my ( $cache_uid1, $cache_uid2 ) ;

        return ( ( undef, undef ) ) if ( !$file ) ;
        if ( $file =~ m{(?:^|/)(\d+)_(\d+)$}x ) {
                $cache_uid1 = $1 ;
                $cache_uid2 = $2 ;
        }
        return ( $cache_uid1, $cache_uid2 ) ;
}

sub tests_match_a_cache_file {
        note( 'Entering tests_match_a_cache_file()' ) ;

        my ( $tuid1, $tuid2 ) ;
        ok( ( $tuid1, $tuid2 ) = match_a_cache_file(), 'match_a_cache_file: no arg' ) ;
        ok( !defined $tuid1, 'match_a_cache_file: no arg 1' ) ;
        ok( !defined $tuid2, 'match_a_cache_file: no arg 2' ) ;

        ok( ( $tuid1, $tuid2 ) = match_a_cache_file( q{} ), 'match_a_cache_file: empty arg' ) ;
        ok( !defined $tuid1, 'match_a_cache_file: empty arg 1' ) ;
        ok( !defined $tuid2, 'match_a_cache_file: empty arg 2' ) ;

        ok( ( $tuid1, $tuid2 ) = match_a_cache_file( '000_000' ), 'match_a_cache_file: 000_000' ) ;
        ok( '000' eq $tuid1, 'match_a_cache_file: 000_000 1' ) ;
        ok( '000' eq $tuid2, 'match_a_cache_file: 000_000 2' ) ;

        ok( ( $tuid1, $tuid2 ) = match_a_cache_file( '123_456' ), 'match_a_cache_file: 123_456' ) ;
        ok( '123' eq $tuid1, 'match_a_cache_file: 123_456 1' ) ;
        ok( '456' eq $tuid2, 'match_a_cache_file: 123_456 2' ) ;

        ok( ( $tuid1, $tuid2 ) = match_a_cache_file( '/tmp/truc/123_456' ), 'match_a_cache_file: /tmp/truc/123_456' ) ;
        ok( '123' eq $tuid1, 'match_a_cache_file: /tmp/truc/123_456 1' ) ;
        ok( '456' eq $tuid2, 'match_a_cache_file: /tmp/truc/123_456 2' ) ;

        ok( ( $tuid1, $tuid2 ) = match_a_cache_file( '/lala123_456' ), 'match_a_cache_file: NO /lala123_456' ) ;
        ok( !$tuid1, 'match_a_cache_file: /lala123_456 1' ) ;
        ok( !$tuid2, 'match_a_cache_file: /lala123_456 2' ) ;

        ok( ( $tuid1, $tuid2 ) = match_a_cache_file( 'la123_456' ), 'match_a_cache_file: NO la123_456' ) ;
        ok( !$tuid1, 'match_a_cache_file: la123_456 1' ) ;
        ok( !$tuid2, 'match_a_cache_file: la123_456 2' ) ;

        note( 'Leaving  tests_match_a_cache_file()' ) ;
        return ;
}

sub clean_cache {
        my ( $cache_files_ref, $cache_1_2_ref, $h1_msgs_all_hash_ref, $h2_msgs_all_hash_ref ) = @_ ;

        $debugcache and myprint( "Entering clean_cache\n" ) ;

        $debugcache and myprint( map { "$_ -> " . $cache_1_2_ref->{$_} . "\n" } keys %{$cache_1_2_ref} ) ;
        foreach my $file ( @{$cache_files_ref} ) {
                $debugcache and myprint( "$file\n" ) ;
                my ( $cache_uid1, $cache_uid2 ) = match_a_cache_file( $file ) ;
                $debugcache and myprint( "u1: $cache_uid1 u2: $cache_uid2 c12: ", $cache_1_2_ref->{$cache_uid1} || q{}, "\n" ) ;

                #                 or ( ! exists( $cache_1_2_ref->{ $cache_uid1 } ) )
                #                 or ( ! ( $cache_uid2 == $cache_1_2_ref->{ $cache_uid1 } ) )
                if (       ( not defined $cache_uid1 )
                        or ( not defined $cache_uid2 )
                        or ( not exists $h1_msgs_all_hash_ref->{$cache_uid1} )
                        or ( not exists $h2_msgs_all_hash_ref->{$cache_uid2} ) )
                {
                        $debugcache and myprint( "remove $file\n" ) ;
                        unlink $file or myprint( "$OS_ERROR" ) ;
                }
        }

        $debugcache and myprint( "Exiting clean_cache\n" ) ;
        return ( 1 ) ;
}

sub tests_clean_cache {
        note( 'Entering tests_clean_cache()' ) ;

        ok( ( not -d 'W/tmp/cache/G1/G2' or rmtree( 'W/tmp/cache/G1/G2' ) ), 'clean_cache: rmtree W/tmp/cache/G1/G2' ) ;
        ok( mkpath( 'W/tmp/cache/G1/G2' ), 'clean_cache: mkpath W/tmp/cache/G1/G2' ) ;

        my @test_files_cache = (
                qw(
                  W/tmp/cache/G1/G2/100_200
                  W/tmp/cache/G1/G2/101_201
                  W/tmp/cache/G1/G2/120_220
                  W/tmp/cache/G1/G2/142_242
                  W/tmp/cache/G1/G2/143_243
                  W/tmp/cache/G1/G2/177_277
                  W/tmp/cache/G1/G2/177_377
                  W/tmp/cache/G1/G2/177_777
                  W/tmp/cache/G1/G2/155_255
                  )
        ) ;
        ok( touch( @test_files_cache ), 'clean_cache: touch W/tmp/cache/G1/G2/...' ) ;

        ok( -f 'W/tmp/cache/G1/G2/100_200', 'clean_cache: 100_200 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/142_242', 'clean_cache: 142_242 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/177_277', 'clean_cache: 177_277 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/177_377', 'clean_cache: 177_377 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/177_777', 'clean_cache: 177_777 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/155_255', 'clean_cache: 155_255 before' ) ;

        my $cache = {
                142 => 242,
                177 => 777,
        } ;

        my $all_1 = {
                142 => q{},
                177 => q{},
        } ;

        my $all_2 = {
                200 => q{},
                242 => q{},
                777 => q{},
        } ;
        ok( clean_cache( \@test_files_cache, $cache, $all_1, $all_2 ), 'clean_cache: ' ) ;

        ok( !-f 'W/tmp/cache/G1/G2/100_200', 'clean_cache: 100_200 after' ) ;
        ok( -f 'W/tmp/cache/G1/G2/142_242',  'clean_cache: 142_242 after' ) ;
        ok( !-f 'W/tmp/cache/G1/G2/177_277', 'clean_cache: 177_277 after' ) ;
        ok( !-f 'W/tmp/cache/G1/G2/177_377', 'clean_cache: 177_377 after' ) ;
        ok( -f 'W/tmp/cache/G1/G2/177_777',  'clean_cache: 177_777 after' ) ;
        ok( !-f 'W/tmp/cache/G1/G2/155_255', 'clean_cache: 155_255 after' ) ;

        note( 'Leaving  tests_clean_cache()' ) ;
        return ;
}

sub tests_clean_cache_2 {
        note( 'Entering tests_clean_cache_2()' ) ;

        ok( ( not -d 'W/tmp/cache/G1/G2' or rmtree( 'W/tmp/cache/G1/G2' ) ), 'clean_cache_2: rmtree W/tmp/cache/G1/G2' ) ;
        ok( mkpath( 'W/tmp/cache/G1/G2' ), 'clean_cache_2: mkpath W/tmp/cache/G1/G2' ) ;

        my @test_files_cache = (
                qw(
                  W/tmp/cache/G1/G2/100_200
                  W/tmp/cache/G1/G2/101_201
                  W/tmp/cache/G1/G2/120_220
                  W/tmp/cache/G1/G2/142_242
                  W/tmp/cache/G1/G2/143_243
                  W/tmp/cache/G1/G2/177_277
                  W/tmp/cache/G1/G2/177_377
                  W/tmp/cache/G1/G2/177_777
                  W/tmp/cache/G1/G2/155_255
                  )
        ) ;
        ok( touch( @test_files_cache ), 'clean_cache_2: touch W/tmp/cache/G1/G2/...' ) ;

        ok( -f 'W/tmp/cache/G1/G2/100_200', 'clean_cache_2: 100_200 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/142_242', 'clean_cache_2: 142_242 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/177_277', 'clean_cache_2: 177_277 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/177_377', 'clean_cache_2: 177_377 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/177_777', 'clean_cache_2: 177_777 before' ) ;
        ok( -f 'W/tmp/cache/G1/G2/155_255', 'clean_cache_2: 155_255 before' ) ;

        my $cache = {
                142 => 242,
                177 => 777,
        } ;

        my $all_1 = {
                $NUMBER_100 => q{},
                142         => q{},
                177         => q{},
        } ;

        my $all_2 = {
                200 => q{},
                242 => q{},
                777 => q{},
        } ;

        ok( clean_cache( \@test_files_cache, $cache, $all_1, $all_2 ), 'clean_cache_2: ' ) ;

        ok( -f 'W/tmp/cache/G1/G2/100_200',  'clean_cache_2: 100_200 after' ) ;
        ok( -f 'W/tmp/cache/G1/G2/142_242',  'clean_cache_2: 142_242 after' ) ;
        ok( !-f 'W/tmp/cache/G1/G2/177_277', 'clean_cache_2: 177_277 after' ) ;
        ok( !-f 'W/tmp/cache/G1/G2/177_377', 'clean_cache_2: 177_377 after' ) ;
        ok( -f 'W/tmp/cache/G1/G2/177_777',  'clean_cache_2: 177_777 after' ) ;
        ok( !-f 'W/tmp/cache/G1/G2/155_255', 'clean_cache_2: 155_255 after' ) ;

        note( 'Leaving  tests_clean_cache_2()' ) ;
        return ;
}

sub tests_mkpath {
        note( 'Entering tests_mkpath()' ) ;

        ok( ( -d 'W/tmp/tests/' or mkpath( 'W/tmp/tests/' ) ), 'mkpath: mkpath W/tmp/tests/' ) ;

      SKIP: {
                skip( 'Tests only for Unix', 10 ) if ( 'MSWin32' eq $OSNAME ) ;
                my $long_path_unix = '123456789/' x 30 ;
                ok( ( -d "W/tmp/tests/long/$long_path_unix" or mkpath( "W/tmp/tests/long/$long_path_unix" ) ), 'mkpath: mkpath 300 char' ) ;
                ok( -d "W/tmp/tests/long/$long_path_unix", 'mkpath: mkpath > 300 char verified' ) ;
                ok( ( -d "W/tmp/tests/long/$long_path_unix" and rmtree( 'W/tmp/tests/long/' ) ), 'mkpath: rmtree 300 char' ) ;
                ok( !-d "W/tmp/tests/long/$long_path_unix", 'mkpath: rmtree 300 char verified' ) ;

                ok( ( -d 'W/tmp/tests/trailing_dots...' or mkpath( 'W/tmp/tests/trailing_dots...' ) ), 'mkpath: mkpath trailing_dots...' ) ;
                ok( -d 'W/tmp/tests/trailing_dots...', 'mkpath: mkpath trailing_dots... verified' ) ;
                ok( ( -d 'W/tmp/tests/trailing_dots...' and rmtree( 'W/tmp/tests/trailing_dots...' ) ), 'mkpath: rmtree trailing_dots...' ) ;
                ok( !-d 'W/tmp/tests/trailing_dots...', 'mkpath: rmtree trailing_dots... verified' ) ;

                eval { ok( 1 / 0, 'mkpath: divide by 0' ) ; } or ok( 1, 'mkpath: can not divide by 0' ) ;
                ok( 1, 'mkpath: still alive' ) ;
        }

      SKIP: {
                skip( 'Tests only for MSWin32', 13 ) if ( 'MSWin32' ne $OSNAME ) ;
                my $long_path_2_prefix = "$tmpdir\\imapsync_tests" || '\\\?\\E:\\TEMP\\imapsync_tests' ;
                myprint( "long_path_2_prefix: $long_path_2_prefix\n" ) ;

                my $long_path_100 = $long_path_2_prefix . '\\' . '123456789\\' x 10 . 'END' ;
                my $long_path_300 = $long_path_2_prefix . '\\' . '123456789\\' x 30 . 'END' ;

                #myprint( "$long_path_100\n"  ) ;

                ok( ( -d $long_path_2_prefix or mkpath( $long_path_2_prefix ) ), 'mkpath: -d mkpath small path' ) ;
                ok( ( -d $long_path_2_prefix ), 'mkpath: -d mkpath small path done' ) ;
                ok( ( -d $long_path_100 or mkpath( $long_path_100 ) ), 'mkpath: mkpath > 100 char' ) ;
                ok( ( -d $long_path_100 ), 'mkpath: -d mkpath > 200 char done' ) ;
                ok( ( -d $long_path_2_prefix and rmtree( $long_path_2_prefix ) ), 'mkpath: rmtree > 100 char' ) ;
                ok( ( !-d $long_path_2_prefix ), 'mkpath: ! -d rmtree done' ) ;

                # Without the eval the following mkpath 300 just kill the whole process without a whisper
                #myprint( "$long_path_300\n"  ) ;
                eval { ok( ( -d $long_path_300 or mkpath( $long_path_300 ) ), 'mkpath: create a path with 300 characters' ) ; }
                  or ok( 1, 'mkpath: can not create a path with 300 characters' ) ;
                ok( ( ( !-d $long_path_300 ) or -d $long_path_300 and rmtree( $long_path_300 ) ), 'mkpath: rmtree the 300 character path' ) ;
                ok( 1, 'mkpath: still alive' ) ;

                ok( ( -d 'W/tmp/tests/trailing_dots...' or mkpath( 'W/tmp/tests/trailing_dots...' ) ), 'mkpath: mkpath trailing_dots...' ) ;
                ok( -d 'W/tmp/tests/trailing_dots...', 'mkpath: mkpath trailing_dots... verified' ) ;
                ok( ( -d 'W/tmp/tests/trailing_dots...' and rmtree( 'W/tmp/tests/trailing_dots...' ) ), 'mkpath: rmtree trailing_dots...' ) ;
                ok( !-d 'W/tmp/tests/trailing_dots...', 'mkpath: rmtree trailing_dots... verified' ) ;

        }

        note( 'Leaving  tests_mkpath()' ) ;

        # Keep this because of the eval used by the caller (failed badly?)
        return 1 ;
}

sub tests_touch {
        note( 'Entering tests_touch()' ) ;

        ok( ( -d 'W/tmp/tests/' or mkpath( 'W/tmp/tests/' ) ), 'touch: mkpath W/tmp/tests/' ) ;
        ok( 1 == touch( 'W/tmp/tests/lala' ), 'touch: W/tmp/tests/lala' ) ;
        ok( 1 == touch( 'W/tmp/tests/\y' ),   'touch: W/tmp/tests/\y' ) ;
        ok( 0 == touch( '/no/no/no/aaa' ),    'touch: not /aaa' ) ;
        ok( 1 == touch( 'W/tmp/tests/lili', 'W/tmp/tests/lolo' ), 'touch: 2 files' ) ;
        ok( 0 == touch( 'W/tmp/tests/\y',   '/no/no/aaa' ),       'touch: 2 files, 1 fails' ) ;

        note( 'Leaving  tests_touch()' ) ;
        return ;
}

sub touch {
        my @files    = @_ ;
        my $failures = 0 ;

        foreach my $file ( @files ) {
                my $fh = IO::File->new ;
                if ( $fh->open( ">> $file" ) ) {
                        $fh->close ;
                }
                else {
                        myprint( "Could not open file $file in write/append mode\n" ) ;
                        $failures++ ;
                }
        }
        return ( !$failures ) ;
}

sub tests_tmpdir_has_colon_bug {
        note( 'Entering tests_tmpdir_has_colon_bug()' ) ;

        ok( 0 == tmpdir_has_colon_bug( q{} ),       'tmpdir_has_colon_bug: ' ) ;
        ok( 0 == tmpdir_has_colon_bug( '/tmp' ),    'tmpdir_has_colon_bug: /tmp' ) ;
        ok( 1 == tmpdir_has_colon_bug( 'C:' ),      'tmpdir_has_colon_bug: C:' ) ;
        ok( 1 == tmpdir_has_colon_bug( 'C:\temp' ), 'tmpdir_has_colon_bug: C:\temp' ) ;

        note( 'Leaving  tests_tmpdir_has_colon_bug()' ) ;
        return ;
}

sub tmpdir_has_colon_bug {
        my $path = shift ;

        my $path_filtered = filter_forbidden_characters( $path ) ;
        if ( $path_filtered ne $path ) {
                ( -d $path_filtered ) and myprint( "Path $path was previously mistakely changed to $path_filtered\n" ) ;
                return ( 1 ) ;
        }
        return ( 0 ) ;
}

sub tmpdir_fix_colon_bug {

        my $err = 0 ;
        if ( not( -d $tmpdir and -r _ and -w _ ) ) {
                myprint( "tmpdir $tmpdir is not valid\n" ) ;
                return ( 0 ) ;
        }
        my $cachedir_new = "$tmpdir/imapsync_cache" ;

        if ( not tmpdir_has_colon_bug( $cachedir_new ) ) { return ( 0 ) }

        # check if old cache directory already exists
        my $cachedir_old = filter_forbidden_characters( $cachedir_new ) ;
        if ( not( -d $cachedir_old ) ) {
                myprint( "Old cache directory $cachedir_new no exists, nothing to do\n" ) ;
                return ( 1 ) ;
        }

        # check if new cache directory already exists
        if ( -d $cachedir_new ) {
                myprint( "New fixed cache directory $cachedir_new already exists, not moving the old one $cachedir_old. Fix this manually.\n" ) ;
                return ( 0 ) ;
        }
        else {
                # move the old one to the new place
                myprint( "Moving $cachedir_old to $cachedir_new Do not interrupt this task.\n" ) ;
                File::Copy::Recursive::rmove( $cachedir_old, $cachedir_new )
                  or do {
                        myprint( "Could not move $cachedir_old to $cachedir_new\n" ) ;
                        $err++ ;
                  } ;

                # check it succeeded
                if ( -d $cachedir_new and -r _ and -w _ ) {
                        myprint( "New fixed cache directory $cachedir_new ok\n" ) ;
                }
                else {
                        myprint( "New fixed cache directory $cachedir_new does not exist\n" ) ;
                        $err++ ;
                }
                if ( -d $cachedir_old ) {
                        myprint( "Old cache directory $cachedir_old still exists\n" ) ;
                        $err++ ;
                }
                else {
                        myprint( "Old cache directory $cachedir_old successfuly moved\n" ) ;
                }
        }
        return ( not $err ) ;
}

sub tests_cache_folder {
        note( 'Entering tests_cache_folder()' ) ;

        ok( '/path/fold1/fold2' eq cache_folder( q{}, '/path', 'fold1', 'fold2' ), 'cache_folder: /path, fold1, fold2 -> /path/fold1/fold2' ) ;
        ok( '/pa_th/fold1/fold2' eq cache_folder( q{}, '/pa*th', 'fold1', 'fold2' ), 'cache_folder: /pa*th, fold1, fold2 -> /path/fold1/fold2' ) ;
        ok( '/_p_a__th/fol_d1/fold2' eq cache_folder( q{}, '/>p<a|*th', 'fol*d1', 'fold2' ), 'cache_folder: />p<a|*th, fol*d1, fold2 -> /path/fol_d1/fold2' ) ;

        ok( 'D:/path/fold1/fold2' eq cache_folder( 'D:', '/path', 'fold1', 'fold2' ), 'cache_folder: /path, fold1, fold2 -> /path/fold1/fold2' ) ;
        ok( 'D:/pa_th/fold1/fold2' eq cache_folder( 'D:', '/pa*th', 'fold1', 'fold2' ), 'cache_folder: /pa*th, fold1, fold2 -> /path/fold1/fold2' ) ;
        ok( 'D:/_p_a__th/fol_d1/fold2' eq cache_folder( 'D:', '/>p<a|*th', 'fol*d1', 'fold2' ), 'cache_folder: />p<a|*th, fol*d1, fold2 -> /path/fol_d1/fold2' ) ;
        ok( '//' eq cache_folder( q{}, q{}, q{}, q{} ), 'cache_folder:  -> //' ) ;
        ok( '//_______' eq cache_folder( q{}, q{}, q{}, '*|?:"<>' ), 'cache_folder: *|?:"<> -> //_______' ) ;

        note( 'Leaving  tests_cache_folder()' ) ;
        return ;
}

sub cache_folder {
        my ( $cache_base, $cache_dir, $h1_fold, $h2_fold ) = @_ ;

        my $sep_1 = $h1_sep || '/' ;
        my $sep_2 = $h2_sep || '/' ;

        #myprint( "$cache_dir h1_fold $h1_fold sep1 $sep_1 h2_fold $h2_fold sep2 $sep_2\n" ) ;
        $h1_fold = convert_sep_to_slash( $h1_fold, $sep_1 ) ;
        $h2_fold = convert_sep_to_slash( $h2_fold, $sep_2 ) ;

        my $cache_folder = "$cache_base" . filter_forbidden_characters( "$cache_dir/$h1_fold/$h2_fold" ) ;

        #myprint( "cache_folder [$cache_folder]\n"  ) ;
        return ( $cache_folder ) ;
}

sub filter_forbidden_characters {
        my $string = shift ;

        if ( !defined $string ) { return ; }

        if ( 'MSWin32' eq $OSNAME ) {

                # Move trailing whitespace to _ " a b /c d " -> " a b_/c d_"
                $string =~ s{\ (/|$)}{_$1}xg ;
        }
        $string =~ s{[\Q*|?:"<>\E\t\r\n\\]}{_}xg ;

        #myprint( "[$string]\n"  ) ;
        return ( $string ) ;
}

sub tests_filter_forbidden_characters {
        note( 'Entering tests_filter_forbidden_characters()' ) ;

        ok( 'a_b' eq filter_forbidden_characters( 'a_b' ),             'filter_forbidden_characters: a_b -> a_b' ) ;
        ok( 'a_b' eq filter_forbidden_characters( 'a*b' ),             'filter_forbidden_characters: a*b -> a_b' ) ;
        ok( 'a_b' eq filter_forbidden_characters( 'a|b' ),             'filter_forbidden_characters: a|b -> a_b' ) ;
        ok( 'a_b' eq filter_forbidden_characters( 'a?b' ),             'filter_forbidden_characters: a?b -> a_b' ) ;
        ok( 'a_______b' eq filter_forbidden_characters( 'a*|?:"<>b' ), 'filter_forbidden_characters: a*|?:"<>b -> a_______b' ) ;

      SKIP: {
                skip( 'Not on MSWin32', 1 ) if ( 'MSWin32' eq $OSNAME ) ;
                ok( ( 'a b ' eq filter_forbidden_characters( 'a b ' ) ), 'filter_forbidden_characters: "a b " -> "a b "' ) ;
        }

      SKIP: {
                skip( 'Only on MSWin32', 2 ) if ( 'MSWin32' ne $OSNAME ) ;
                ok( ( ' a b_' eq filter_forbidden_characters( ' a b ' ) ),             'filter_forbidden_characters: "a b " -> "a b_"' ) ;
                ok( ( ' a b_/ c d_' eq filter_forbidden_characters( ' a b / c d ' ) ), 'filter_forbidden_characters: " a b / c d " -> "a b_/ c d_"' ) ;
        }

        ok( 'a_b' eq filter_forbidden_characters( "a\tb" ), 'filter_forbidden_characters: a\tb -> a_b' ) ;
        ok( "a_b" eq filter_forbidden_characters( "a\rb" ), 'filter_forbidden_characters: a\rb -> a_b' ) ;
        ok( "a_b" eq filter_forbidden_characters( "a\nb" ), 'filter_forbidden_characters: a\nb -> a_b' ) ;
        ok( "a_b" eq filter_forbidden_characters( "a\\b" ), 'filter_forbidden_characters: a\b -> a_b' ) ;

        note( 'Leaving  tests_filter_forbidden_characters()' ) ;
        return ;
}

sub convert_sep_to_slash {
        my ( $folder, $sep ) = @_ ;

        $folder =~ s{\Q$sep\E}{/}xg ;
        return ( $folder ) ;
}

sub tests_convert_sep_to_slash {
        note( 'Entering tests_convert_sep_to_slash()' ) ;

        ok( q{} eq convert_sep_to_slash( q{}, '/' ), 'convert_sep_to_slash: no folder' ) ;
        ok( 'INBOX' eq convert_sep_to_slash( 'INBOX', '/' ), 'convert_sep_to_slash: INBOX' ) ;
        ok( 'INBOX/foo' eq convert_sep_to_slash( 'INBOX/foo', '/' ), 'convert_sep_to_slash: INBOX/foo' ) ;
        ok( 'INBOX/foo' eq convert_sep_to_slash( 'INBOX_foo', '_' ), 'convert_sep_to_slash: INBOX_foo' ) ;
        ok( 'INBOX/foo/zob' eq convert_sep_to_slash( 'INBOX_foo_zob', '_' ), 'convert_sep_to_slash: INBOX_foo_zob' ) ;
        ok( 'INBOX/foo' eq convert_sep_to_slash( 'INBOX.foo', '.' ), 'convert_sep_to_slash: INBOX.foo' ) ;
        ok( 'INBOX/foo/hi' eq convert_sep_to_slash( 'INBOX.foo.hi', '.' ), 'convert_sep_to_slash: INBOX.foo.hi' ) ;

        note( 'Leaving  tests_convert_sep_to_slash()' ) ;
        return ;
}

sub tests_regexmess {
        note( 'Entering tests_regexmess()' ) ;

        ok( 'blabla' eq regexmess( 'blabla' ), 'regexmess, no regexmess, nothing to do' ) ;

        @regexmess = ( 'lalala' ) ;
        ok( not( defined regexmess( 'popopo' ) ), 'regexmess, bad regex lalala' ) ;

        @regexmess = ( 's/p/Z/g' ) ;
        ok( 'ZoZoZo' eq regexmess( 'popopo' ), 'regexmess, s/p/Z/g' ) ;

        @regexmess = ( 's{c}{C}gxms' ) ;
        ok( "H1: abC\nH2: Cde\n\nBody abC" eq regexmess( "H1: abc\nH2: cde\n\nBody abc" ), 'regexmess, c->C' ) ;

        @regexmess = ( 's{\AFrom\ }{From:}gxms' ) ;
        ok( q{} eq regexmess( q{} ), 'From mbox 1 add colon blank' ) ;

        ok( 'From:<tartanpion@machin.truc>' eq regexmess( 'From <tartanpion@machin.truc>' ), 'From mbox 2 add colo' ) ;

        ok( "\n" . 'From <tartanpion@machin.truc>' eq regexmess( "\n" . 'From <tartanpion@machin.truc>' ), 'From mbox 3 add colo' ) ;

        ok( "From: zzz\n" . 'From <tartanpion@machin.truc>' eq regexmess( "From  zzz\n" . 'From <tartanpion@machin.truc>' ), 'From mbox 4 add colo' ) ;

        @regexmess = ( 's{\AFrom\ [^\n]*(\n)?}{}gxms' ) ;
        ok( q{} eq regexmess( q{} ), 'From mbox 1 remove, blank' ) ;

        ok( q{} eq regexmess( 'From <tartanpion@machin.truc>' ), 'From mbox 2 remove' ) ;

        ok( "\n" . 'From <tartanpion@machin.truc>' eq regexmess( "\n" . 'From <tartanpion@machin.truc>' ), 'From mbox 3 remove' ) ;

        #myprint( "[", regexmess("From  zzz\n" . 'From <tartanpion@machin.truc>'), "]" ) ;
        ok( q{} . 'From <tartanpion@machin.truc>' eq regexmess( "From  zzz\n" . 'From <tartanpion@machin.truc>' ), 'From mbox 4 remove' ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Bye.
EOM
                  eq regexmess(
                        <<'EOM'
From  zzz
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Bye.
EOM
                  ),
                'From mbox 5 remove'
        ) ;

        @regexmess = ( 's{\A((?:[^\n]+\n)+|)^Disposition-Notification-To:[^\n]*\n(\r?\n|.*\n\r?\n)}{$1$2}xms' ) ;    # SUPER SUPER BEST!
        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
From:<tartanpion@machin.truc>

Hello,
Bye.
EOM
                  ),
                'regexmess: 1 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Hello,
Bye.
EOM
                  ),
                'regexmess: 2 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Bye.
EOM
                  ),
                'regexmess: 3 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Bye.
EOM
                  ),
                'regexmess: 4 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Bye.
EOM
                  ),
                'regexmess: 5 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Bye.
EOM
                  ),
                'regexmess: 6 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  ),
                'regexmess: 7 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Bye.
EOM
                  ),
                'regexmess: 8 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Bye.
EOM
                  ),
                'regexmess: 9 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>


Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>


Bye.
EOM
                  ),
                'regexmess: 10 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  ),
                'regexmess: 11 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  ),
                'regexmess: 12 Delete header Disposition-Notification-To:'
        ) ;

        @regexmess = ( 's{\A(.*?(?! ^$))^Disposition-Notification-To:(.*?)$}{$1X-Disposition-Notification-To:$2}igxms' ) ;    # BAD!
        @regexmess = ( 's{\A((?:[^\n]+\n)+|)(^Disposition-Notification-To:[^\n]*\n)(\r?\n|.*\n\r?\n)}{$1X-$2$3}ims' ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  ),
                'regexmess: 13 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
X-Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
From:<tartanpion@machin.truc>

Hello,

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
From:<tartanpion@machin.truc>

Hello,

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Bye.
EOM
                  ),
                'regexmess: 14 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
X-Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
From:<tartanpion@machin.truc>

Hello,

Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
From:<tartanpion@machin.truc>

Hello,

Bye.
EOM
                  ),
                'regexmess: 15 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>
X-Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Hello,

Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>

Hello,

Bye.
EOM
                  ),
                'regexmess: 16 Delete header Disposition-Notification-To:'
        ) ;

        ok(
                <<'EOM'
X-Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,

Bye.
EOM
                  eq regexmess(
                        <<'EOM'
Disposition-Notification-To: Gilles LAMIRAL <gilles@lamiral.info>
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello,

Bye.
EOM
                  ),
                'regexmess: 17 Delete header Disposition-Notification-To:'
        ) ;

        # regex to play with Date: from the FAQ
        #@regexmess = 's{\A(.*?(?! ^$))^Date:(.*?)$}{$1Date:$2\nX-Date:$2}gxms'

        note( 'Leaving  tests_regexmess()' ) ;
        return ;

}

sub regexmess {
        my ( $string ) = @_ ;
        foreach my $regexmess ( @regexmess ) {
                $debug and myprint( "eval \$string =~ $regexmess\n" ) ;
                my $ret = eval "\$string =~ $regexmess ; 1" ;

                #myprint( "eval [$ret]\n"  ) ;
                if ( ( not $ret ) or $EVAL_ERROR ) {
                        myprint( "Error: eval regexmess '$regexmess': $EVAL_ERROR" ) ;
                        return ( undef ) ;
                }
        }
        $debug and myprint( "$string\n" ) ;
        return ( $string ) ;
}

sub tests_skipmess {
        note( 'Entering tests_skipmess()' ) ;

        ok( not( defined skipmess( 'blabla' ) ), 'skipmess, no skipmess, no skip' ) ;

        @skipmess = ( '[' ) ;
        ok( not( defined skipmess( 'popopo' ) ), 'skipmess, bad regex [' ) ;

        @skipmess = ( 'lalala' ) ;
        ok( not( defined skipmess( 'popopo' ) ), 'skipmess, bad regex lalala' ) ;

        @skipmess = ( '/popopo/' ) ;
        ok( 1 == skipmess( 'popopo' ), 'skipmess, popopo match regex /popopo/' ) ;

        @skipmess = ( '/popopo/' ) ;
        ok( 0 == skipmess( 'rrrrrr' ), 'skipmess, rrrrrr does not match regex /popopo/' ) ;

        @skipmess = ( 'm{^$}' ) ;
        ok( 1 == skipmess( q{} ),   'skipmess: empty string yes' ) ;
        ok( 0 == skipmess( 'Hi!' ), 'skipmess: empty string no' ) ;

        @skipmess = ( 'm{i}' ) ;
        ok( 1 == skipmess( 'Hi!' ),  'skipmess: i string yes' ) ;
        ok( 0 == skipmess( 'Bye!' ), 'skipmess: i string no' ) ;

        @skipmess = ( 'm{[\x80-\xff]}' ) ;
        ok( 0 == skipmess( 'Hi!' ),  'skipmess: i 8bit no' ) ;
        ok( 1 == skipmess( "\xff" ), 'skipmess: \xff 8bit yes' ) ;

        @skipmess = ( 'm{A}', 'm{B}' ) ;
        ok( 0 == skipmess( 'Hi!' ),    'skipmess: A or B no' ) ;
        ok( 0 == skipmess( 'lala' ),   'skipmess: A or B no' ) ;
        ok( 0 == skipmess( "\xff" ),   'skipmess: A or B no' ) ;
        ok( 1 == skipmess( 'AB' ),     'skipmess: A or B yes' ) ;
        ok( 1 == skipmess( 'BA' ),     'skipmess: A or B yes' ) ;
        ok( 1 == skipmess( 'AA' ),     'skipmess: A or B yes' ) ;
        ok( 1 == skipmess( 'Ok Bye' ), 'skipmess: A or B yes' ) ;

        @skipmess = ( 'm#\A((?:[^\n]+\n)+|)^Content-Type: Message/Partial;[^\n]*\n(?:\n|.*\n\n)#ism' ) ;    # SUPER BEST!

        ok(
                1 == skipmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
Content-Type: Message/Partial; blabla
From:<tartanpion@machin.truc>

Hello!
Bye.
EOM
                ),
                'skipmess: 1 match Content-Type: Message/Partial'
        ) ;

        ok(
                0 == skipmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello!
Bye.
EOM
                ),
                'skipmess: 2 not match Content-Type: Message/Partial'
        ) ;

        ok(
                1 == skipmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>
Content-Type: Message/Partial; blabla

Hello!
Bye.
EOM
                ),
                'skipmess: 3 match Content-Type: Message/Partial'
        ) ;

        ok(
                0 == skipmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello!
Content-Type: Message/Partial; blabla
Bye.
EOM
                ),
                'skipmess: 4 not match Content-Type: Message/Partial'
        ) ;

        ok(
                0 == skipmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
From:<tartanpion@machin.truc>

Hello!
Content-Type: Message/Partial; blabla

Bye.
EOM
                ),
                'skipmess: 5 not match Content-Type: Message/Partial'
        ) ;

        ok(
                1 == skipmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
Content-Type: Message/Partial; blabla
From:<tartanpion@machin.truc>

Hello!

Content-Type: Message/Partial; blabla

Bye.
EOM
                ),
                'skipmess: 6 match Content-Type: Message/Partial'
        ) ;

        ok(
                1 == skipmess(
                        <<'EOM'
Date: Sat, 10 Jul 2010 05:34:45 -0700
Content-Type: Message/Partial;
From:<tartanpion@machin.truc>

Hello!
Bye.
EOM
                ),
                'skipmess: 7 match Content-Type: Message/Partial'
        ) ;

        ok(
                1 == skipmess(
                        <<'EOM'
Date: Wed, 2 Jul 2014 02:26:40 +0000
MIME-Version: 1.0
Content-Type: message/partial;
        id="TAN_U_P<1404267997.00007489ed17>";
        number=3;
        total=3

6HQ6Hh3CdXj77qEGixerQ6zHx0OnQ/Cf5On4W0Y6vtU2crABZQtD46Hx1EOh8dDz4+OnTr1G


Hello!
Bye.
EOM
                ),
                'skipmess: 8 match Content-Type: Message/Partial'
        ) ;

        ok(
                1 == skipmess(
                        <<'EOM'
Return-Path: <gilles@lamiral.info>
Received: by lamiral.info (Postfix, from userid 1000)
        id 21EB12443BF; Mon,  2 Mar 2015 15:38:35 +0100 (CET)
Subject: test: aethaecohngiexao
To: <tata@petite.lamiral.info>
X-Mailer: mail (GNU Mailutils 2.2)
Message-Id: <20150302143835.21EB12443BF@lamiral.info>
Content-Type: message/partial;
        id="TAN_U_P<1404267997.00007489ed17>";
        number=3;
        total=3
Date: Mon,  2 Mar 2015 15:38:34 +0100 (CET)
From: gilles@lamiral.info (Gilles LAMIRAL)

test: aethaecohngiexao
EOM
                ),
                'skipmess: 9 match Content-Type: Message/Partial'
        ) ;

        ok(
                1 == skipmess(
                        <<'EOM'
Date: Mon,  2 Mar 2015 15:38:34 +0100 (CET)
From: gilles@lamiral.info (Gilles LAMIRAL)
Content-Type: message/partial;
        id="TAN_U_P<1404267997.00007489ed17>";
        number=3;
        total=3

test: aethaecohngiexao
EOM
                          . "lalala\n" x 3_000_000
                ),
                'skipmess: 10 match Content-Type: Message/Partial'
        ) ;

        ok(
                0 == skipmess(
                        <<'EOM'
Date: Mon,  2 Mar 2015 15:38:34 +0100 (CET)
From: gilles@lamiral.info (Gilles LAMIRAL)

test: aethaecohngiexao
EOM
                          . "lalala\n" x 3_000_000
                ),
                'skipmess: 11 match Content-Type: Message/Partial'
        ) ;

        ok(
                0 == skipmess(
                        <<"EOM"
From: fff\r
To: fff\r
Subject: Testing imapsync --skipmess\r
Date: Mon, 22 Aug 2011 08:40:20 +0800\r
Mime-Version: 1.0\r
Content-Type: text/plain; charset=iso-8859-1\r
Content-Transfer-Encoding: 7bit\r
\r
EOM
                          . qq{!#"d%&'()*+,-./0123456789:;<=>?\@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefg\r\n } x 32_730
                ),
                'skipmess: 12 not match Content-Type: Message/Partial'
        ) ;

        # Complex regular subexpression recursion limit (32766) exceeded with more lines
        # exit;

        note( 'Leaving  tests_skipmess()' ) ;
        return ;
}

sub skipmess {
        my ( $string ) = @_ ;
        my $match ;

        #myprint( "$string\n"  ) ;
        foreach my $skipmess ( @skipmess ) {
                $debug and myprint( "eval \$match = \$string =~ $skipmess\n" ) ;
                my $ret = eval "\$match = \$string =~ $skipmess ; 1" ;

                #myprint( "eval [$ret]\n"  ) ;
                $debug and myprint( "match [$match]\n" ) ;
                if ( ( not $ret ) or $EVAL_ERROR ) {
                        myprint( "Error: eval skipmess '$skipmess': $EVAL_ERROR" ) ;
                        return ( undef ) ;
                }
                return ( $match ) if ( $match ) ;
        }
        return ( $match ) ;
}

sub tests_bytes_display_string {
        note( 'Entering tests_bytes_display_string()' ) ;

        is( 'NA', bytes_display_string(),           'bytes_display_string: no args => NA' ) ;
        is( 'NA', bytes_display_string( undef ),    'bytes_display_string: undef   => NA' ) ;
        is( 'NA', bytes_display_string( 'blabla' ), 'bytes_display_string: blabla   => NA' ) ;

        ok( '0.000 KiB' eq bytes_display_string( 0 ),         'bytes_display_string:       0' ) ;
        ok( '0.001 KiB' eq bytes_display_string( 1 ),         'bytes_display_string:       1' ) ;
        ok( '0.010 KiB' eq bytes_display_string( 10 ),        'bytes_display_string:      10' ) ;
        ok( '1.000 MiB' eq bytes_display_string( 1_048_575 ), 'bytes_display_string: 1_048_575' ) ;
        ok( '1.000 MiB' eq bytes_display_string( 1_048_576 ), 'bytes_display_string: 1_048_576' ) ;

        ok( '1.000 GiB' eq bytes_display_string( 1_073_741_823 ), 'bytes_display_string: 1_073_741_823 ' ) ;
        ok( '1.000 GiB' eq bytes_display_string( 1_073_741_824 ), 'bytes_display_string: 1_073_741_824 ' ) ;

        ok( '1.000 TiB' eq bytes_display_string( 1_099_511_627_775 ), 'bytes_display_string: 1_099_511_627_775' ) ;
        ok( '1.000 TiB' eq bytes_display_string( 1_099_511_627_776 ), 'bytes_display_string: 1_099_511_627_776' ) ;

        ok( '1.000 PiB' eq bytes_display_string( 1_125_899_906_842_623 ), 'bytes_display_string: 1_125_899_906_842_623' ) ;
        ok( '1.000 PiB' eq bytes_display_string( 1_125_899_906_842_624 ), 'bytes_display_string: 1_125_899_906_842_624' ) ;

        ok( '1024.000 PiB' eq bytes_display_string( 1_152_921_504_606_846_975 ), 'bytes_display_string: 1_152_921_504_606_846_975' ) ;
        ok( '1024.000 PiB' eq bytes_display_string( 1_152_921_504_606_846_976 ), 'bytes_display_string: 1_152_921_504_606_846_976' ) ;

        ok( '1048576.000 PiB' eq bytes_display_string( 1_180_591_620_717_411_303_424 ), 'bytes_display_string: 1_180_591_620_717_411_303_424' ) ;

        #myprint(  bytes_display_string( 1_180_591_620_717_411_303_424 ), "\n"  ) ;
        note( 'Leaving  tests_bytes_display_string()' ) ;

        return ;
}

sub bytes_display_string {
        my ( $bytes ) = @_ ;

        my $readable_value = q{} ;

        if ( !defined( $bytes ) ) {
                return ( 'NA' ) ;
        }

        if ( not match_number( $bytes ) ) {
                return ( 'NA' ) ;
        }

      SWITCH: {
                if ( abs( $bytes ) < ( 1000 * $KIBI ) ) {
                        $readable_value = mysprintf( '%.3f KiB', $bytes / $KIBI ) ;
                        last SWITCH;
                }
                if ( abs( $bytes ) < ( 1000 * $KIBI * $KIBI ) ) {
                        $readable_value = mysprintf( '%.3f MiB', $bytes / ( $KIBI * $KIBI ) ) ;
                        last SWITCH;
                }
                if ( abs( $bytes ) < ( 1000 * $KIBI * $KIBI * $KIBI ) ) {
                        $readable_value = mysprintf( '%.3f GiB', $bytes / ( $KIBI * $KIBI * $KIBI ) ) ;
                        last SWITCH;
                }
                if ( abs( $bytes ) < ( 1000 * $KIBI * $KIBI * $KIBI * $KIBI ) ) {
                        $readable_value = mysprintf( '%.3f TiB', $bytes / ( $KIBI * $KIBI * $KIBI * $KIBI ) ) ;
                        last SWITCH;
                }
                else {
                        $readable_value = mysprintf( '%.3f PiB', $bytes / ( $KIBI * $KIBI * $KIBI * $KIBI * $KIBI ) ) ;
                }

                # if you have exabytes (EiB) of email to transfer, you have too much email!
        }

        #myprint( "$bytes = $readable_value\n"  ) ;
        return ( $readable_value ) ;
}

sub stats {
        my $mysync = shift ;

        if ( !$mysync->{stats} ) {
                return ;
        }

        my $timeend  = time ;
        my $timediff = $timeend - $mysync->{timestart} ;

        my $timeend_str = localtime $timeend ;

        my $memory_consumption_at_end = memory_consumption() || 0 ;
        my $memory_consumption_at_start = $mysync->{memory_consumption_at_start} || 0 ;
        my $memory_ratio = ( $max_msg_size_in_bytes ) ? mysprintf( '%.1f', $memory_consumption_at_end / $max_msg_size_in_bytes ) : 'NA' ;

        myprint( "++++ Statistics\n" ) ;
        myprint( "Transfer started on               : $timestart_str\n" ) ;
        myprint( "Transfer ended on                 : $timeend_str\n" ) ;
        myprintf( "Transfer time                     : %.1f sec\n", $timediff ) ;
        myprint( "Folders synced                    : $h1_folders_wanted_ct/$h1_folders_wanted_nb synced\n" ) ;
        myprint( "Messages transferred              : $mysync->{nb_msg_transferred} " ) ;
        myprint( "(could be $nb_msg_skipped_dry_mode without dry mode)" ) if ( $mysync->{dry} ) ;
        myprint( "\n" ) ;
        myprint( "Messages skipped                  : $nb_msg_skipped\n" ) ;
        myprint( "Messages found duplicate on host1 : $h1_nb_msg_duplicate\n" ) ;
        myprint( "Messages found duplicate on host2 : $h2_nb_msg_duplicate\n" ) ;
        myprint( "Messages void (noheader) on host1 : $h1_nb_msg_noheader\n" ) ;
        myprint( "Messages void (noheader) on host2 : $h2_nb_msg_noheader\n" ) ;
        myprint( "Messages deleted on host1         : $h1_nb_msg_deleted\n" ) ;
        myprint( "Messages deleted on host2         : $h2_nb_msg_deleted\n" ) ;
        myprintf( "Total bytes transferred           : %s (%s)\n", $mysync->{total_bytes_transferred}, bytes_display_string( $mysync->{total_bytes_transferred} ) ) ;
        myprintf( "Total bytes duplicate host1       : %s (%s)\n", $h1_total_bytes_duplicate,          bytes_display_string( $h1_total_bytes_duplicate ) ) ;
        myprintf( "Total bytes duplicate host2       : %s (%s)\n", $h2_total_bytes_duplicate,          bytes_display_string( $h2_total_bytes_duplicate ) ) ;
        myprintf( "Total bytes skipped               : %s (%s)\n", $total_bytes_skipped,               bytes_display_string( $total_bytes_skipped ) ) ;
        myprintf( "Total bytes error                 : %s (%s)\n", $total_bytes_error,                 bytes_display_string( $total_bytes_error ) ) ;
        $timediff ||= 1 ;    # No division per 0
        myprintf( "Message rate                      : %.1f messages/s\n", $mysync->{nb_msg_transferred} / $timediff ) ;
        myprintf( "Average bandwidth rate            : %.1f KiB/s\n",      $mysync->{total_bytes_transferred} / $KIBI / $timediff ) ;
        myprint( "Reconnections to host1            : $mysync->{imap1}->{IMAPSYNC_RECONNECT_COUNT}\n" ) ;
        myprint( "Reconnections to host2            : $mysync->{imap2}->{IMAPSYNC_RECONNECT_COUNT}\n" ) ;
        myprintf( "Memory consumption at the end     : %.1f MiB (started with %.1f MiB)\n", $memory_consumption_at_end / $KIBI / $KIBI, $memory_consumption_at_start / $KIBI / $KIBI ) ;
        myprintf( "Biggest message                   : %s bytes (%s)\n", $max_msg_size_in_bytes, bytes_display_string( $max_msg_size_in_bytes ) ) ;
        myprint( "Memory/biggest message ratio      : $memory_ratio\n" ) ;

        if ( $foldersizesatend and $foldersizes ) {

                my $nb_msg_start_diff = diff_or_NA( $h2_nb_msg_start, $h1_nb_msg_start ) ;
                my $bytes_start_diff  = diff_or_NA( $h2_bytes_start,  $h1_bytes_start ) ;

                myprintf( "Start difference host2 - host1    : %s messages, %s bytes (%s)\n", $nb_msg_start_diff, $bytes_start_diff, bytes_display_string( $bytes_start_diff ) ) ;

                my $nb_msg_end_diff = diff_or_NA( $h2_nb_msg_end, $h1_nb_msg_end ) ;
                my $bytes_end_diff  = diff_or_NA( $h2_bytes_end,  $h1_bytes_end ) ;

                myprintf( "Final difference host2 - host1    : %s messages, %s bytes (%s)\n", $nb_msg_end_diff, $bytes_end_diff, bytes_display_string( $bytes_end_diff ) ) ;
        }
        myprint( "Detected $mysync->{nb_errors} errors\n\n" ) ;

        myprint( $warn_release, "\n" ) ;
        myprint( homepage(),    "\n" ) ;
        return ;
}

sub diff_or_NA {
        my ( $n1, $n2 ) = @ARG ;

        if ( not defined $n1 or not defined $n2 ) {
                return 'NA' ;
        }

        if (       not match_number( $n1 )
                or not match_number( $n2 ) )
        {
                return 'NA' ;
        }

        return ( $n1 - $n2 ) ;
}

sub match_number {
        my $n = shift @ARG ;

        if ( not defined $n ) {
                return 0 ;
        }
        if ( $n =~ /[0-9]+\.?[0-9]?/x ) {
                return 1 ;
        }
        else {
                return 0 ;
        }
}

sub tests_match_number {
        note( 'Entering tests_match_number()' ) ;

        is( 0, match_number(),           'match_number: no parameters => 0' ) ;
        is( 0, match_number( undef ),    'match_number:         undef => 0' ) ;
        is( 0, match_number( 'blabla' ), 'match_number:        blabla => 0' ) ;
        is( 1, match_number( 0 ),        'match_number:             0 => 1' ) ;
        is( 1, match_number( 1 ),        'match_number:             1 => 1' ) ;
        is( 1, match_number( 1.0 ),      'match_number:           1.0 => 1' ) ;
        is( 1, match_number( 0.0 ),      'match_number:           0.0 => 1' ) ;

        note( 'Leaving  tests_match_number()' ) ;
        return ;
}

sub tests_diff_or_NA {
        note( 'Entering tests_diff_or_NA()' ) ;

        is( 'NA', diff_or_NA(),        'diff_or_NA: no parameters => NA' ) ;
        is( 'NA', diff_or_NA( undef ), 'diff_or_NA: undef         => NA' ) ;
        is( 'NA', diff_or_NA( undef,    undef ),    'diff_or_NA: undef  undef  => NA' ) ;
        is( 'NA', diff_or_NA( undef,    1 ),        'diff_or_NA: undef  1      => NA' ) ;
        is( 'NA', diff_or_NA( 1,        undef ),    'diff_or_NA: 1      undef  => NA' ) ;
        is( 'NA', diff_or_NA( 'blabla', 1 ),        'diff_or_NA: blabla 1      => NA' ) ;
        is( 'NA', diff_or_NA( 1,        'blabla' ), 'diff_or_NA: 1      blabla => NA' ) ;
        is( 0,    diff_or_NA( 1,        1 ),        'diff_or_NA: 1      1      =>  0' ) ;
        is( 1,    diff_or_NA( 1,        0 ),        'diff_or_NA: 1      0      =>  1' ) ;
        is( -1,   diff_or_NA( 0,        1 ),        'diff_or_NA: 0      1      => -1' ) ;
        is( 0,    diff_or_NA( 1.0,      1 ),        'diff_or_NA: 1.0    1      =>  0' ) ;
        is( 1,    diff_or_NA( 1.0,      0 ),        'diff_or_NA: 1.0    0      =>  1' ) ;
        is( -1,   diff_or_NA( 0,        1.0 ),      'diff_or_NA: 0      1.0    => -1' ) ;

        note( 'Leaving  tests_diff_or_NA()' ) ;
        return ;
}

sub homepage {
        return ( 'Homepage: https://imapsync.lamiral.info/' ) ;
}

sub load_modules {
        if (       $sync->{ssl1}
                or $sync->{ssl2}
                or $sync->{tls1}
                or $sync->{tls2} )
        {
                if ( $sync->{inet4} ) {
                        IO::Socket::SSL->import( 'inet4' ) ;
                }
                if ( $sync->{inet6} ) {
                        IO::Socket::SSL->import( 'inet6' ) ;
                }
        }
        return ;
}

sub parse_header_msg {
        my ( $mysync, $imap, $m_uid, $s_heads, $s_fir, $side, $s_hash ) = @_ ;

        my $head    = $s_heads->{$m_uid} ;
        my $headnum = scalar keys %{$head} ;
        $debug and myprint( "$side uid $m_uid head nb pass one: ", $headnum, "\n" ) ;

        if ( ( !$headnum ) and ( $wholeheaderifneeded ) ) {
                myprint( "$side uid $m_uid no header by parse_headers so taking whole header with BODY.PEEK[HEADER]\n" ) ;
                $imap->fetch( $m_uid, 'BODY.PEEK[HEADER]' ) ;
                my $whole_header = $imap->_transaction_literals ;

                #myprint( $whole_header ) ;
                $head = decompose_header( $whole_header ) ;

                $headnum = scalar keys %{$head} ;
                $debug and myprint( "$side uid $m_uid head nb pass two: ", $headnum, "\n" ) ;
        }

        #myprint( Data::Dumper->Dump( [ $head, \%useheader ] )  ) ;

        my $headstr ;

        $headstr = header_construct( $head, $side, $m_uid ) ;

        if ( ( !$headstr ) and ( $mysync->{addheader} ) and ( $side eq 'Host1' ) ) {
                my $header = add_header( $m_uid ) ;
                myprint( "Host1 uid $m_uid no header found so adding our own [$header]\n" ) ;
                $headstr .= uc $header ;
                $s_fir->{$m_uid}->{NO_HEADER} = 1 ;
        }

        return if ( !$headstr ) ;

        my $size  = $s_fir->{$m_uid}->{'RFC822.SIZE'} ;
        my $flags = $s_fir->{$m_uid}->{'FLAGS'} ;
        my $idate = $s_fir->{$m_uid}->{'INTERNALDATE'} ;
        $size = length $headstr unless ( $size ) ;
        my $m_md5 = md5_base64( $headstr ) ;
        $debug and myprint( "$side uid $m_uid sig $m_md5 size $size idate $idate\n" ) ;
        my $key ;
        if ( $skipsize ) {
                $key = "$m_md5" ;
        }
        else {
                $key = "$m_md5:$size" ;
        }

        # 0 return code is used to identify duplicate message hash
        return 0 if exists $s_hash->{"$key"} ;
        $s_hash->{"$key"}{'5'} = $m_md5 ;
        $s_hash->{"$key"}{'s'} = $size ;
        $s_hash->{"$key"}{'D'} = $idate ;
        $s_hash->{"$key"}{'F'} = $flags ;
        $s_hash->{"$key"}{'m'} = $m_uid ;

        return ( 1 ) ;
}

sub header_construct {

        my ( $head, $side, $m_uid ) = @_ ;

        my $headstr ;
        foreach my $h ( sort keys %{$head} ) {
                next if ( not( exists $useheader{ uc $h } )
                        and ( not exists $useheader{'ALL'} ) ) ;
                foreach my $val ( sort @{ $head->{$h} } ) {

                        my $H = header_line_normalize( $h, $val ) ;

                        # show stuff in debug mode
                        $debug and myprint( "$side uid $m_uid header [$H]", "\n" ) ;

                        if ( $skipheader and $H =~ m/$skipheader/xi ) {
                                $debug and myprint( "$side uid $m_uid skipping header [$H]\n" ) ;
                                next ;
                        }
                        $headstr .= "$H" ;
                }
        }
        return ( $headstr ) ;
}

sub header_line_normalize {
        my ( $header_key, $header_val ) = @_ ;

        # no 8-bit data in headers !
        $header_val =~ s/[\x80-\xff]/X/xog ;

        # change tabulations to space (Gmail bug on with "Received:" on multilines)
        $header_val =~ s/\t/\ /xgo ;

        # remove the first blanks ( dbmail bug? )
        $header_val =~ s/^\s*//xo ;

        # remove the last blanks ( Gmail bug )
        $header_val =~ s/\s*$//xo ;

        # remove successive blanks ( Mailenable does it )
        $header_val =~ s/\s+/ /xgo ;

        # remove Message-Id value domain part ( Mailenable changes it )
        if ( ( $messageidnodomain ) and ( 'MESSAGE-ID' eq uc $header_key ) ) { $header_val =~ s/^([^@]+).*$/$1/xo ; }

        # and uppercase header line
        # (dbmail and dovecot)

        my $header_line = uc "$header_key: $header_val" ;

        return ( $header_line ) ;
}

sub tests_header_line_normalize {
        note( 'Entering tests_header_line_normalize()' ) ;

        ok( ': ' eq header_line_normalize( q{}, q{} ), 'header_line_normalize: empty args' ) ;
        ok( 'HHH: VVV' eq header_line_normalize( 'hhh', 'vvv' ),   'header_line_normalize: hhh vvv ' ) ;
        ok( 'HHH: VVV' eq header_line_normalize( 'hhh', '  vvv' ), 'header_line_normalize: remove first blancs' ) ;
        ok( 'HHH: AA BB CCC D' eq header_line_normalize( 'hhh', 'aa  bb   ccc d' ), 'header_line_normalize: remove succesive blanks' ) ;
        ok( 'HHH: AA BB CCC' eq header_line_normalize( 'hhh', 'aa  bb   ccc   ' ), 'header_line_normalize: remove last blanks' ) ;
        ok( 'HHH: VVV XX YY' eq header_line_normalize( 'hhh', "vvv\t\txx\tyy" ),   'header_line_normalize: tabs' ) ;
        ok( 'HHH: XABX' eq header_line_normalize( 'hhh', "\x80AB\xff" ), 'header_line_normalize: 8bit' ) ;

        note( 'Leaving  tests_header_line_normalize()' ) ;
        return ;
}

sub firstline {

        # extract the first line of a file (without \n)

        my ( $file ) = @_ ;
        my $line = q{} ;

        if ( !-e $file ) {
                myprint( "Cannot open file $file since it does not exist\n" ) ;
                return ;
        }

        open my $FILE, '<', $file or do {
                myprint( "Error opening file $file : $OS_ERROR\n" ) ;
                return ;
        } ;
        $line = <$FILE> || q{} ;
        close $FILE ;
        chomp $line ;
        return $line ;
}

sub tests_firstline {
        note( 'Entering tests_firstline()' ) ;

        is( undef, firstline( 'W/tmp/tests/noexist.txt' ), 'tests_firstline: not getting blabla from W/tmp/tests/noexist.txt' ) ;
        is( "blabla\n", string_to_file( "blabla\n", 'W/tmp/tests/firstline.txt' ), 'tests_firstline: put blabla in W/tmp/tests/firstline.txt' ) ;
        is( 'blabla', firstline( 'W/tmp/tests/firstline.txt' ), 'tests_firstline: get blabla from W/tmp/tests/firstline.txt' ) ;
        is( q{}, string_to_file( q{}, 'W/tmp/tests/firstline2.txt' ), 'tests_firstline: put empty string in W/tmp/tests/firstline2.txt' ) ;
        is( q{}, firstline( 'W/tmp/tests/firstline2.txt' ), 'tests_firstline: get empty string from W/tmp/tests/firstline2.txt' ) ;
        is( "\n", string_to_file( "\n", 'W/tmp/tests/firstline3.txt' ), 'tests_firstline: put CR in W/tmp/tests/firstline3.txt' ) ;
        is( q{}, firstline( 'W/tmp/tests/firstline3.txt' ), 'tests_firstline: get empty string from W/tmp/tests/firstline3.txt' ) ;

        note( 'Leaving  tests_firstline()' ) ;
        return ;
}

# Should be unit tested and then be used by file_to_string, refactoring file_to_string
sub file_to_array {

        my ( $file ) = shift ;
        my @string ;

        open my $FILE, '<', $file or do {
                myprint( "Error reading file $file : $OS_ERROR" ) ;
                return ;
        } ;
        @string = <$FILE> ;
        close $FILE ;
        return ( @string ) ;
}

sub tests_file_to_string {
        note( 'Entering tests_file_to_string()' ) ;

        is( undef, file_to_string(),             'file_to_string: no args => undef' ) ;
        is( undef, file_to_string( '/noexist' ), 'file_to_string: /noexist => undef' ) ;
        is( undef, file_to_string( '/' ),        'file_to_string: reading a directory => undef' ) ;
        ok( file_to_string( $PROGRAM_NAME ), 'file_to_string: reading myself' ) ;

        ok( ( -d 'W/tmp/tests/' or mkpath( 'W/tmp/tests/' ) ), 'file_to_string: mkpath W/tmp/tests/' ) ;

        is( 'lilili', string_to_file( 'lilili', 'W/tmp/tests/canbewritten' ), 'file_to_string: string_to_file filling W/tmp/tests/canbewritten with lilili' ) ;
        is( 'lilili', file_to_string( 'W/tmp/tests/canbewritten' ), 'file_to_string: reading W/tmp/tests/canbewritten is lilili' ) ;

        is( q{}, string_to_file( q{}, 'W/tmp/tests/empty' ), 'file_to_string: string_to_file filling W/tmp/tests/empty with empty string' ) ;
        is( q{}, file_to_string( 'W/tmp/tests/empty' ), 'file_to_string: reading W/tmp/tests/empty is empty' ) ;

        note( 'Leaving  tests_file_to_string()' ) ;
        return ;
}

sub file_to_string {
        my $file = shift ;
        if ( !$file )    { return ; }
        if ( !-e $file ) { return ; }
        if ( !-f $file ) { return ; }
        if ( !-r $file ) { return ; }
        my @string ;
        if ( open my $FILE, '<', $file ) {
                @string = <$FILE> ;
                close $FILE ;
                return ( join q{}, @string ) ;
        }
        else {
                myprint( "Error reading file $file : $OS_ERROR\n" ) ;
                return ;
        }
}

sub tests_string_to_file {
        note( 'Entering tests_string_to_file()' ) ;

        is( undef, string_to_file(),           'string_to_file: no args => undef' ) ;
        is( undef, string_to_file( 'lalala' ), 'string_to_file: one arg => undef' ) ;
        is( undef, string_to_file( 'lalala', '.' ), 'string_to_file: writing a directory => undef' ) ;
        ok( ( -d 'W/tmp/tests/' or mkpath( 'W/tmp/tests/' ) ), 'string_to_file: mkpath W/tmp/tests/' ) ;
        is( 'lalala', string_to_file( 'lalala', 'W/tmp/tests/canbewritten' ), 'string_to_file: W/tmp/tests/canbewritten with lalala' ) ;
        is( q{},      string_to_file( q{},      'W/tmp/tests/empty' ),        'string_to_file: W/tmp/tests/empty with empty string' ) ;

      SKIP: {
                Readonly my $NB_UNX_tests_string_to_file => 1 ;
                skip( 'Not on Unix', $NB_UNX_tests_string_to_file ) if ( 'MSWin32' eq $OSNAME ) ;
                is( undef, string_to_file( 'lalala', '/cantouch' ), 'string_to_file: /cantouch denied => undef' ) ;
        }

        note( 'Leaving  tests_string_to_file()' ) ;
        return ;
}

sub string_to_file {
        my ( $string, $file ) = @_ ;
        if ( !defined $string ) { return ; }
        if ( !defined $file )   { return ; }

        if ( !-e $file && !-w dirname( $file ) ) {
                myprint( "string_to_file: directory of $file is not writable\n" ) ;
                return ;
        }

        if ( !sysopen( FILE, $file, O_WRONLY | O_TRUNC | O_CREAT, 0600 ) ) {
                myprint( "string_to_file: failure writing to $file with error: $OS_ERROR\n" ) ;
                return ;
        }
        print FILE $string ;
        close FILE ;
        return $string ;
}

q^
This is a multiline comment.
Based on David Carter discussion, to do:
* Call parameters stay the same.
* Now always "return( $string, $error )". Descriptions below.
OK * Still    capture STDOUT via "1> $output_tmpfile" to finish in $string and "return( $string, $error )"
OK * Now also capture STDERR via "2> $error_tmpfile"  to finish in $error  and "return( $string, $error )"
OK * in case of CHILD_ERROR, return( undef, $error )
  and print $error, with folder/UID/maybeSubject context,
  on console and at the end with the final error listing. Count this as a sync error.
* in case of good command, take final $string as is, unless void. In case $error with value then print it.
* in case of good command and final $string empty, consider it like CHILD_ERROR =>
  return( undef, $error ) and print $error, with folder/UID/maybeSubject context,
  on console and at the end with the final error listing. Count this as a sync error.
^ if 0 ;    # End of multiline comment.

sub pipemess {
        my ( $string, @commands ) = @_ ;
        my $error = q{} ;
        foreach my $command ( @commands ) {
                my $input_tmpfile  = "$tmpdir/imapsync_tmp_file.$PROCESS_ID.inp.txt" ;
                my $output_tmpfile = "$tmpdir/imapsync_tmp_file.$PROCESS_ID.out.txt" ;
                my $error_tmpfile  = "$tmpdir/imapsync_tmp_file.$PROCESS_ID.err.txt" ;
                string_to_file( $string, $input_tmpfile ) ;
                ` $command < $input_tmpfile 1> $output_tmpfile 2> $error_tmpfile ` ;
                my $is_command_ko = $CHILD_ERROR ;
                my $error_cmd     = file_to_string( $error_tmpfile ) ;
                chomp( $error_cmd ) ;
                $string = file_to_string( $output_tmpfile ) ;
                my $string_len = length( $string ) ;
                unlink $input_tmpfile, $output_tmpfile, $error_tmpfile ;

                if ( $is_command_ko or ( !$string_len ) ) {
                        my $cmd_exit_value = $CHILD_ERROR >> 8 ;
                        my $cmd_end_signal = $CHILD_ERROR & 127 ;
                        my $signal_log     = ( $cmd_end_signal ) ? " signal $cmd_end_signal and" : q{} ;
                        my $error_log      = qq{Failure: --pipemess command "$command" ended with$signal_log "$string_len" characters exit value "$cmd_exit_value" and STDERR "$error_cmd"\n} ;
                        myprint( $error_log ) ;
                        if ( wantarray ) {
                                return @{ [ undef, $error_log ] };
                        }
                        else {
                                return ;
                        }
                }
                if ( $error_cmd ) {
                        $error .= qq{STDERR of --pipemess "$command": $error_cmd\n} ;
                        myprint( qq{STDERR of --pipemess "$command": $error_cmd\n} ) ;
                }
        }

        #myprint( "[$string]\n"  ) ;
        if ( wantarray ) {
                return ( $string, $error ) ;
        }
        else {
                return $string ;
        }
}

sub tests_pipemess {
        note( 'Entering tests_pipemess()' ) ;

      SKIP: {
                Readonly my $NB_WIN_tests_pipemess => 3 ;
                skip( 'Not on MSWin32', $NB_WIN_tests_pipemess ) if ( 'MSWin32' ne $OSNAME ) ;

                # Windows
                # "type" command does not accept redirection of STDIN with <
                # "sort" does
                ok( "nochange\n" eq pipemess( 'nochange', 'sort' ), 'pipemess: nearly no change by sort' ) ;
                ok( "nochange2\n" eq pipemess( 'nochange2', qw( sort sort ) ), 'pipemess: nearly no change by sort,sort' ) ;

                # command not found
                #diag( 'Warning and failure about cacaprout are on purpose' ) ;
                ok( !defined( pipemess( q{}, 'cacaprout' ) ), 'pipemess: command not found' ) ;

        }

        my ( $stringT, $errorT ) ;

      SKIP: {
                Readonly my $NB_UNX_tests_pipemess => 25 ;
                skip( 'Not on Unix', $NB_UNX_tests_pipemess ) if ( 'MSWin32' eq $OSNAME ) ;

                # Unix
                ok( 'nochange' eq pipemess( 'nochange', 'cat' ), 'pipemess: no change by cat' ) ;

                ok( 'nochange2' eq pipemess( 'nochange2', 'cat', 'cat' ), 'pipemess: no change by cat,cat' ) ;

                ok( "     1\tnumberize\n" eq pipemess( "numberize\n", 'cat -n' ), 'pipemess: numberize by cat -n' ) ;
                ok( "     1\tnumberize\n     2\tnumberize\n" eq pipemess( "numberize\nnumberize\n", 'cat -n' ), 'pipemess: numberize by cat -n' ) ;

                ok( "A\nB\nC\n" eq pipemess( "A\nC\nB\n", 'sort' ), 'pipemess: sort' ) ;

                # command not found
                #diag( 'Warning and failure about cacaprout are on purpose' ) ;
                is( undef, pipemess( q{}, 'cacaprout' ), 'pipemess: command not found' ) ;

                # success with true but no output at all
                is( undef, pipemess( q{blabla}, 'true' ), 'pipemess: true but no output' ) ;

                # failure with false and no output at all
                is( undef, pipemess( q{blabla}, 'false' ), 'pipemess: false and no output' ) ;

                # Failure since pipemess is not a real pipe, so first cat wait for standard input
                is( q{blabla}, pipemess( q{blabla}, '( cat|cat ) ' ), 'pipemess: ok by ( cat|cat )' ) ;

                ( $stringT, $errorT ) = pipemess( 'nochange', 'cat' ) ;
                is( $stringT, 'nochange', 'pipemess: list context, no change by cat, string' ) ;
                is( $errorT,  q{},        'pipemess: list context, no change by cat, no error' ) ;

                ( $stringT, $errorT ) = pipemess( 'dontcare', 'true' ) ;
                is( $stringT, undef, 'pipemess: list context, true but no output, string' ) ;
                like( $errorT, qr{\QFailure: --pipemess command "true" ended with "0" characters exit value "0" and STDERR ""\E}xm, 'pipemess: list context, true but no output, error' ) ;

                ( $stringT, $errorT ) = pipemess( 'dontcare', 'false' ) ;
                is( $stringT, undef, 'pipemess: list context, false and no output, string' ) ;
                like( $errorT, qr{\QFailure: --pipemess command "false" ended with "0" characters exit value "1" and STDERR ""\E}xm, 'pipemess: list context, false and no output, error' ) ;

                ( $stringT, $errorT ) = pipemess( 'dontcare', '/bin/echo -n blablabla' ) ;
                is( $stringT, q{blablabla}, 'pipemess: list context, "echo -n blablabla", string' ) ;
                is( $errorT,  q{},          'pipemess: list context, "echo blablabla", error' ) ;

                ( $stringT, $errorT ) = pipemess( 'dontcare', '( echo -n blablabla 3>&1 1>&2 2>&3 )' ) ;
                is( $stringT, undef, 'pipemess: list context, "no output STDERR blablabla", string' ) ;
                like( $errorT, qr{blablabla"}xm, 'pipemess: list context, "no output STDERR blablabla", error' ) ;

                ( $stringT, $errorT ) = pipemess( 'dontcare', '( echo -n blablabla 3>&1 1>&2 2>&3 )', 'false' ) ;
                is( $stringT, undef, 'pipemess: list context, "no output STDERR blablabla then false", string' ) ;
                like( $errorT, qr{blablabla"}xm, 'pipemess: list context, "no output STDERR blablabla then false", error' ) ;

                ( $stringT, $errorT ) = pipemess( 'dontcare', 'false', '( echo -n blablabla 3>&1 1>&2 2>&3 )' ) ;
                is( $stringT, undef, 'pipemess: list context, "false then STDERR blablabla", string' ) ;
                like( $errorT, qr{\QFailure: --pipemess command "false" ended with "0" characters exit value "1" and STDERR ""\E}xm, 'pipemess: list context, "false then STDERR blablabla", error' ) ;

                ( $stringT, $errorT ) = pipemess( 'dontcare', '( echo rrrrr ; echo -n error_blablabla 3>&1 1>&2 2>&3 )' ) ;
                like( $stringT, qr{rrrrr}xm, 'pipemess: list context, "STDOUT rrrrr STDERR error_blablabla", string' ) ;
                like( $errorT, qr{STDERR.*error_blablabla}xm, 'pipemess: list context, "STDOUT rrrrr STDERR error_blablabla", error' ) ;

        }

        ( $stringT, $errorT ) = pipemess( 'dontcare', 'cacaprout' ) ;
        is( $stringT, undef, 'pipemess: list context, cacaprout not found, string' ) ;
        like( $errorT, qr{\QFailure: --pipemess command "cacaprout" ended with "0" characters exit value\E}xm, 'pipemess: list context, cacaprout not found, error' ) ;

        note( 'Leaving  tests_pipemess()' ) ;
        return ;
}

sub tests_is_a_release_number {
        note( 'Entering tests_is_a_release_number()' ) ;

        is( undef, is_a_release_number(), 'is_a_release_number: no args => undef' ) ;
        ok( is_a_release_number( $RELEASE_NUMBER_EXAMPLE_1 ), 'is_a_release_number 1.351' ) ;
        ok( is_a_release_number( $RELEASE_NUMBER_EXAMPLE_2 ), 'is_a_release_number 42.4242' ) ;
        ok( is_a_release_number( imapsync_version( $sync ) ), 'is_a_release_number imapsync_version(  )' ) ;
        ok( !is_a_release_number( 'blabla' ),                 '! is_a_release_number blabla' ) ;

        note( 'Leaving  tests_is_a_release_number()' ) ;
        return ;
}

sub is_a_release_number {
        my $number = shift ;
        if ( !defined $number ) { return ; }
        return ( $number =~ m{^\d+\.\d+$}xo ) ;
}

sub imapsync_version_public {

        my $local_version     = imapsync_version( $sync ) ;
        my $imapsync_basename = imapsync_basename() ;
        my $agent_info        = "$OSNAME system, perl " . mysprintf( '%vd', $PERL_VERSION ) . ", Mail::IMAPClient $Mail::IMAPClient::VERSION" . " $imapsync_basename" ;
        my $sock              = IO::Socket::INET->new(
                PeerAddr => 'imapsync.lamiral.info',
                PeerPort => 80,
                Proto    => 'tcp',
        ) ;
        return ( 'unknown' ) if not $sock ;
        print $sock
          "GET /prj/imapsync/VERSION HTTP/1.0\r\n",
          "User-Agent: imapsync/$local_version ($agent_info)\r\n",
          "Host: ks.lamiral.info\r\n\r\n" ;
        my @line = <$sock> ;
        close $sock ;
        my $last_release = $line[$LAST] ;
        chomp $last_release ;
        return ( $last_release ) ;
}

sub not_long_imapsync_version_public {

        #myprint( "Entering not_long_imapsync_version_public\n" ) ;

        my $fake = shift ;
        if ( $fake ) { return $fake }

        my $val ;

        # Doesn't work with gethostbyname (see perlipc)
        #local $SIG{ALRM} = sub { die "alarm\n" } ;

        if ( 'MSWin32' eq $OSNAME ) {
                local $SIG{ALRM} = sub { die "alarm\n" } ;
        }
        else {

                POSIX::sigaction( SIGALRM, POSIX::SigAction->new( sub { croak 'alarm' } ) )
                  or myprint( "Error setting SIGALRM handler: $OS_ERROR\n" ) ;
        }

        my $ret = eval {
                alarm 3 ;
                {
                        $val = imapsync_version_public() ;

                        #sleep 4 ;
                        #myprint( "End of imapsync_version_public\n"  ) ;
                }
                alarm 0 ;
                1 ;
        } ;

        #myprint( "eval [$ret]\n"  ) ;
        if ( ( not $ret ) or $EVAL_ERROR ) {

                #myprint( "$EVAL_ERROR" ) ;
                if ( $EVAL_ERROR =~ /alarm/ ) {

                        # timed out
                        return ( 'timeout' ) ;
                }
                else {
                        alarm 0 ;
                        return ( 'unknown' ) ;    # propagate unexpected errors
                }
        }
        else {
                # Good!
                return ( $val ) ;
        }
}

sub tests_not_long_imapsync_version_public {
        note( 'Entering tests_not_long_imapsync_version_public()' ) ;

        is( 1, is_a_release_number( not_long_imapsync_version_public() ), 'not_long_imapsync_version_public: public release is a number' ) ;

        note( 'Leaving  tests_not_long_imapsync_version_public()' ) ;
        return ;
}

sub check_last_release {
        my $fake           = shift ;
        my $public_release = not_long_imapsync_version_public( $fake ) ;
        $debug and myprint( "check_last_release: [$public_release]\n" ) ;
        my $inline_help_when_on = '( Use --noreleasecheck to avoid this release check. )' ;

        if ( $public_release eq 'unknown' ) {
                return ( 'Imapsync public release is unknown.' . $inline_help_when_on ) ;
        }

        if ( $public_release eq 'timeout' ) {
                return ( 'Imapsync public release is unknown (timeout).' . $inline_help_when_on ) ;
        }

        if ( !is_a_release_number( $public_release ) ) {
                return ( "Imapsync public release is unknown ($public_release)." . $inline_help_when_on ) ;
        }

        my $imapsync_here = imapsync_version( $sync ) ;

        if ( $public_release > $imapsync_here ) {
                return ( 'This imapsync is not up to date. ' . "( local $imapsync_here < official $public_release )" . $inline_help_when_on ) ;
        }
        else {
                return ( 'This imapsync is up to date. ' . "( local $imapsync_here >= official $public_release )" . $inline_help_when_on ) ;
        }

        return ( 'really unknown' ) ;    # Should never arrive here
}

sub tests_check_last_release {
        note( 'Entering tests_check_last_release()' ) ;

        diag( check_last_release( 1.1 ) ) ;

        # \Q \E here to avoid putting \ before each space
        like( check_last_release( 1.1 ), qr/\Qis up to date\E/mxs, 'check_last_release: up to date' ) ;
        like( check_last_release( 1.1 ), qr/1\.1/mxs, 'check_last_release: up to date, include number' ) ;
        diag( check_last_release( 999.999 ) ) ;
        like( check_last_release( 999.999 ),   qr/\Qnot up to date\E/mxs,                               'check_last_release: not up to date' ) ;
        like( check_last_release( 999.999 ),   qr/999\.999/mxs,                                         'check_last_release: not up to date, include number' ) ;
        like( check_last_release( 'unknown' ), qr/\QImapsync public release is unknown\E/mxs,           'check_last_release: unknown' ) ;
        like( check_last_release( 'timeout' ), qr/\QImapsync public release is unknown (timeout)\E/mxs, 'check_last_release: timeout' ) ;
        like( check_last_release( 'lalala' ),  qr/\QImapsync public release is unknown (lalala)\E/mxs,  'check_last_release: lalala' ) ;
        diag( check_last_release() ) ;

        note( 'Leaving  tests_check_last_release()' ) ;
        return ;
}

sub imapsync_version {
        my $mysync = shift ;
        my $rcs    = $mysync->{rcs} ;
        my $version ;

        $version = version_from_rcs( $rcs ) ;
        return ( $version ) ;
}

sub tests_version_from_rcs {
        note( 'Entering tests_version_from_rcs()' ) ;

        is( undef,     version_from_rcs(),                                 'version_from_rcs: no args => UNKNOWN' ) ;
        is( 1.831,     version_from_rcs( q{imapsync,v 1.831 2017/08/27} ), 'version_from_rcs: imapsync,v 1.831 2017/08/27 => 1.831' ) ;
        is( 'UNKNOWN', version_from_rcs( 1.831 ),                          'version_from_rcs:  1.831  => UNKNOWN' ) ;

        note( 'Leaving  tests_version_from_rcs()' ) ;
        return ;
}

sub version_from_rcs {

        my $rcs = shift ;
        if ( !$rcs ) { return ; }

        my $version = 'UNKNOWN' ;

        if ( $rcs =~ m{,v\s+(\d+\.\d+)}mxso ) {
                $version = $1;
        }

        return ( $version ) ;
}

sub tests_imapsync_basename {
        note( 'Entering tests_imapsync_basename()' ) ;

        ok( imapsync_basename() =~ m/imapsync/, 'imapsync_basename: match imapsync' ) ;
        ok( 'blabla' ne imapsync_basename(),    'imapsync_basename: do not equal blabla' ) ;

        note( 'Leaving  tests_imapsync_basename()' ) ;
        return ;
}

sub imapsync_basename {

        return basename( $PROGRAM_NAME ) ;

}

sub localhost_info {
        my $mysync = shift ;
        my ( $infos ) = join( q{}, "Here is imapsync ", imapsync_version( $mysync ), " on host " . hostname(), ", a $OSNAME system with ", ram_memory_info(), "\n", 'with Perl ', mysprintf( '%vd ', $PERL_VERSION ), "and Mail::IMAPClient $Mail::IMAPClient::VERSION", ) ;
        return ( $infos ) ;
}

sub tests_cpu_number {
        note( 'Entering tests_cpu_number()' ) ;

        is( 1, is_an_integer( cpu_number() ), "cpu_number: is_an_integer" ) ;
        ok( 1 <= cpu_number(), "cpu_number: 1 or more" ) ;
        is( 1,          cpu_number( 1 ),          "cpu_number: 1 => 1" ) ;
        is( 1,          cpu_number( $MINUS_ONE ), "cpu_number: -1 => 1" ) ;
        is( 1,          cpu_number( 'lalala' ),   "cpu_number: lalala => 1" ) ;
        is( $NUMBER_42, cpu_number( $NUMBER_42 ), "cpu_number: $NUMBER_42 => 1" ) ;
        note( 'Leaving  tests_cpu_number()' ) ;
        return ;
}

sub cpu_number {

        my $cpu_number_forced = shift ;

        # Well, here 1 is better than 0 or undef
        my $cpu_number = 1 ;    # Default value, erased if better found

        my @cpuinfo ;
        if ( $ENV{"NUMBER_OF_PROCESSORS"} ) {

                # might be under a Windows system
                $cpu_number = $ENV{"NUMBER_OF_PROCESSORS"} ;
                $debug and myprint( "Number of processors found by env var NUMBER_OF_PROCESSORS: $cpu_number\n" ) ;
        }
        elsif ( 'darwin' eq $OSNAME ) {
                $cpu_number = `sysctl -n hw.ncpu` ;
                chomp( $cpu_number ) ;
                $debug and myprint( "Number of processors found by cmd 'sysctl -n hw.ncpu': $cpu_number\n" ) ;
        }
        elsif ( !-e '/proc/cpuinfo' ) {
                $debug and myprint( "Number of processors not found so I might assume there is only 1\n" ) ;
                $cpu_number = 1 ;
        }
        elsif ( @cpuinfo = file_to_array( '/proc/cpuinfo' ) ) {
                $cpu_number = grep { /^processor/mxs } @cpuinfo ;
                $debug and myprint( "Number of processors found via /proc/cpuinfo: $cpu_number\n" ) ;
        }

        if ( defined $cpu_number_forced ) {
                $cpu_number = $cpu_number_forced ;
        }
        return ( integer_or_1( $cpu_number ) ) ;
}

sub tests_integer_or_1 {

        is( 1,          integer_or_1(),             'integer_or_1: no args => 1' ) ;
        is( 1,          integer_or_1( undef ),      'integer_or_1: undef => 1' ) ;
        is( $NUMBER_10, integer_or_1( $NUMBER_10 ), 'integer_or_1: 10 => 10' ) ;
        is( 1,          integer_or_1( q{} ),        'integer_or_1: empty string => 1' ) ;
        is( 1,          integer_or_1( 'lalala' ),   'integer_or_1: lalala => 1' ) ;
        return ;
}

sub integer_or_1 {
        my $number = shift ;
        if ( is_an_integer( $number ) ) {
                return $number ;
        }

        # else
        return 1 ;
}

sub tests_is_an_integer {
        note( 'Entering tests_is_an_integer()' ) ;

        is( undef, is_an_integer(), 'is_an_integer: no args => undef ' ) ;
        ok( is_an_integer( 1 ),                     'is_an_integer: 1 => yes ' ) ;
        ok( is_an_integer( $NUMBER_42 ),            'is_an_integer: 42 => yes ' ) ;
        ok( is_an_integer( "$NUMBER_42" ),          'is_an_integer: "$NUMBER_42" => yes ' ) ;
        ok( is_an_integer( '42' ),                  'is_an_integer: "42" => yes ' ) ;
        ok( is_an_integer( $NUMBER_104_857_600 ),   'is_an_integer: 104_857_600 => yes' ) ;
        ok( is_an_integer( "$NUMBER_104_857_600" ), 'is_an_integer: "$NUMBER_104_857_600" => yes' ) ;
        ok( is_an_integer( '104857600' ),           'is_an_integer: 104857600 => yes' ) ;
        ok( !is_an_integer( 'blabla' ),             'is_an_integer: blabla => no' ) ;
        ok( !is_an_integer( q{} ),                  'is_an_integer: empty string => no' ) ;

        note( 'Leaving  tests_is_an_integer()' ) ;
        return ;
}

sub is_an_integer {
        my $number = shift ;
        if ( !defined $number ) { return ; }
        return ( $number =~ m{^\d+$}xo ) ;
}

sub tests_loadavg {
        note( 'Entering tests_loadavg()' ) ;

      SKIP: {
                skip( 'Tests for darwin', 2 ) if ( 'darwin' ne $OSNAME ) ;
                is( undef, loadavg( '/noexist' ), 'loadavg: /noexist => undef' ) ;
                is_deeply( [ '0.11', '0.22', '0.33' ], [ loadavg( 'W/t/loadavg.out' ) ], 'loadavg W/t/loadavg.out => 0.11 0.22 0.33' ) ;
        }

      SKIP: {
                skip( 'Tests for linux', 3 ) if ( 'linux' ne $OSNAME ) ;
                is( undef, loadavg( '/noexist' ), 'loadavg: /noexist => undef' ) ;
                ok( loadavg(), 'loadavg: no args' ) ;

                is_deeply( [ '0.39', '0.30', '0.37', '1/602' ], [ loadavg( '0.39 0.30 0.37 1/602 6073' ) ], 'loadavg 0.39 0.30 0.37 1/602 6073 => [0.39, 0.30, 0.37, 1/602]' ) ;
        }

      SKIP: {
                skip( 'Tests for Windows', 1 ) if ( 'MSWin32' ne $OSNAME ) ;
                is_deeply( [0], [ loadavg() ], 'loadavg on MSWin32 => 0' ) ;

        }

        note( 'Leaving  tests_loadavg()' ) ;
        return ;
}

sub loadavg {
        if ( 'linux' eq $OSNAME ) {
                return ( loadavg_linux( @ARG ) ) ;
        }
        if ( 'darwin' eq $OSNAME ) {
                return ( loadavg_darwin( @ARG ) ) ;
        }
        if ( 'MSWin32' eq $OSNAME ) {
                return ( loadavg_windows( @ARG ) ) ;
        }
        return ( 'unknown' ) ;

}

sub loadavg_linux {
        my $line = shift ;

        if ( !$line ) {
                $line = firstline( '/proc/loadavg' ) or return ;
        }

        my ( $avg_1_min, $avg_5_min, $avg_15_min, $current_runs ) = split /\s/mxs, $line ;
        if ( all_defined( $avg_1_min, $avg_5_min, $avg_15_min ) ) {
                $debug and myprint( "System load: $avg_1_min $avg_5_min $avg_15_min $current_runs\n" ) ;
                return ( $avg_1_min, $avg_5_min, $avg_15_min, $current_runs ) ;
        }
        return ;
}

sub loadavg_darwin {
        my $file = shift ;

        # Example of output of command "sysctl vm.loadavg":
        # vm.loadavg: { 0.15 0.08 0.08 }
        my $loadavg ;

        if ( !defined $file ) {
                eval {
                        $loadavg = `/usr/sbin/sysctl vm.loadavg` ;

                        #myprint( "LOADAVG DARWIN: $loadavg\n" ) ;
                } ;
                if ( $EVAL_ERROR ) { myprint( "[$EVAL_ERROR]\n" ) ; return ; }
        }
        else {
                $loadavg = firstline( $file ) or return ;
        }

        my ( $avg_1_min, $avg_5_min, $avg_15_min ) = $loadavg =~ /vm\.loadavg\s*[:=]\s*\{?\s*(\d+\.?\d*)\s+(\d+\.?\d*)\s+(\d+\.?\d*)/mxs ;
        $debug and myprint( "System load: $avg_1_min $avg_5_min $avg_15_min\n" ) ;
        return ( $avg_1_min, $avg_5_min, $avg_15_min ) ;
}

sub loadavg_windows {
        my $file = shift ;

        # Example of output of command "wmic cpu get loadpercentage":
        # LoadPercentage
        # 12
        my $loadavg ;

        if ( !defined $file ) {
                eval {
                        #$loadavg = `CMD wmic cpu get loadpercentage` ;
                        $loadavg = "LoadPercentage\n0\n" ;

                        #myprint( "LOADAVG WIN: $loadavg\n" ) ;
                } ;
                if ( $EVAL_ERROR ) { myprint( "[$EVAL_ERROR]\n" ) ; return ; }
        }
        else {
                $loadavg = file_to_string( $file ) or return ;

                #myprint( "$loadavg" ) ;
        }
        $loadavg =~ /LoadPercentage\n(\d+)/xms ;
        my $num = $1 ;
        $num /= 100 ;

        $debug and myprint( "System load: $num\n" ) ;
        return ( $num ) ;
}

sub tests_load_and_delay {
        note( 'Entering tests_load_and_delay()' ) ;

        is( undef, load_and_delay(),    'load_and_delay: no args => undef ' ) ;
        is( undef, load_and_delay( 1 ), 'load_and_delay: not 4 args => undef ' ) ;
        is( undef, load_and_delay( 0, 1, 1, 1 ), 'load_and_delay: division per 0 => undef ' ) ;
        is( 0,     load_and_delay( 1, 1, 1, 1 ), 'load_and_delay: one core, loads are all 1 => ok ' ) ;
        is( 0,     load_and_delay( 2, 2, 2, 2 ), 'load_and_delay: two core, loads are all 2 => ok ' ) ;
        is( 0,     load_and_delay( 2, 2, 4, 5 ), 'load_and_delay: two core, load1m     is 2 => ok ' ) ;

        is( 0,  load_and_delay( 1, 0, 0, 0 ), 'load_and_delay: one core, load1m=0 load5m=0 load15m=0 => 0 ' ) ;
        is( 0,  load_and_delay( 1, 0, 0, 2 ), 'load_and_delay: one core, load1m=0 load5m=0 load15m=2 => 0 ' ) ;
        is( 0,  load_and_delay( 1, 0, 2, 0 ), 'load_and_delay: one core, load1m=0 load5m=2 load15m=0 => 0 ' ) ;
        is( 0,  load_and_delay( 1, 0, 2, 2 ), 'load_and_delay: one core, load1m=0 load5m=2 load15m=2 => 0 ' ) ;
        is( 1,  load_and_delay( 1, 2, 0, 0 ), 'load_and_delay: one core, load1m=2 load5m=0 load15m=0 => 1 ' ) ;
        is( 1,  load_and_delay( 1, 2, 0, 2 ), 'load_and_delay: one core, load1m=2 load5m=0 load15m=2 => 1 ' ) ;
        is( 5,  load_and_delay( 1, 2, 2, 0 ), 'load_and_delay: one core, load1m=2 load5m=2 load15m=0 => 5 ' ) ;
        is( 15, load_and_delay( 1, 2, 2, 2 ), 'load_and_delay: one core, load1m=2 load5m=2 load15m=2 => 15 ' ) ;

        is( 0,  load_and_delay( 4, 0, 2, 2 ), 'load_and_delay: four core, load1m=0 load5m=2 load15m=2 => 0 ' ) ;
        is( 1,  load_and_delay( 4, 8, 0, 0 ), 'load_and_delay: four core, load1m=2 load5m=0 load15m=0 => 1 ' ) ;
        is( 1,  load_and_delay( 4, 8, 0, 2 ), 'load_and_delay: four core, load1m=2 load5m=0 load15m=2 => 1 ' ) ;
        is( 5,  load_and_delay( 4, 8, 8, 0 ), 'load_and_delay: four core, load1m=2 load5m=2 load15m=0 => 5 ' ) ;
        is( 15, load_and_delay( 4, 8, 8, 8 ), 'load_and_delay: four core, load1m=2 load5m=2 load15m=2 => 15 ' ) ;
        is( 15, load_and_delay( 4, 8, 8, 8, 'lalala' ), 'load_and_delay: five arguments is ok' ) ;

        note( 'Leaving  tests_load_and_delay()' ) ;
        return ;
}

sub load_and_delay {

        # Basically return 0 if load is not heavy, ie <= 1 per processor

        if ( 4 > scalar @ARG ) { return ; }

        my ( $cpu_num, $avg_1_min, $avg_5_min, $avg_15_min ) = @ARG ;

        if ( 0 == $cpu_num ) { return ; }

        # Let divide by number of cores
        ( $avg_1_min, $avg_5_min, $avg_15_min ) = map { $_ / $cpu_num } ( $avg_1_min, $avg_5_min, $avg_15_min ) ;

        # One of avg ok => ok, for now it is a OR
        if ( $avg_1_min <= 1 )  { return 0 ; }
        if ( $avg_5_min <= 1 )  { return 1 ; }    # Retry in 1 minute
        if ( $avg_15_min <= 1 ) { return 5 ; }    # Retry in 5 minutes
        return 15 ;                               # Retry in 15 minutes
}

sub ram_memory_info {

        # In GigaBytes so division by 1024 * 1024 * 1024
        #
        return ( sprintf( "%.1f/%.1f free GiB of RAM", Sys::MemInfo::get( "freemem" ) / ( $KIBI**3 ), Sys::MemInfo::get( "totalmem" ) / ( $KIBI**3 ), ) ) ;
}

sub tests_memory_stress {
        note( 'Entering tests_memory_stress()' ) ;

        is( undef, memory_stress(), 'memory_stress: => undef' ) ;

        note( 'Leaving  tests_memory_stress()' ) ;
        return ;
}

sub memory_stress {

        my $total_ram_in_MB = Sys::MemInfo::get( "totalmem" ) / ( $KIBI * $KIBI ) ;
        my $i = 1 ;

        myprintf( "Stress memory consumption before: %.1f MiB\n", memory_consumption() / $KIBI / $KIBI ) ;
        while ( $i < $total_ram_in_MB / 1.7 ) { $a .= "A" x 1000_000 ; $i++ }
        myprintf( "Stress memory consumption after: %.1f MiB\n", memory_consumption() / $KIBI / $KIBI ) ;
        return ;

}

sub tests_memory_consumption {
        note( 'Entering tests_memory_consumption()' ) ;

        like( memory_consumption(),              qr{\d+}xms, 'memory_consumption no args' ) ;
        like( memory_consumption( 1 ),           qr{\d+}xms, 'memory_consumption 1' ) ;
        like( memory_consumption( $PROCESS_ID ), qr{\d+}xms, "memory_consumption_of_pids $PROCESS_ID" ) ;

        like( memory_consumption_ratio(),     qr{\d+}xms, 'memory_consumption_ratio' ) ;
        like( memory_consumption_ratio( 1 ),  qr{\d+}xms, 'memory_consumption_ratio 1' ) ;
        like( memory_consumption_ratio( 10 ), qr{\d+}xms, 'memory_consumption_ratio 10' ) ;

        like( memory_consumption(), qr{\d+}xms, "memory_consumption\n" ) ;

        note( 'Leaving  tests_memory_consumption()' ) ;
        return ;
}

sub memory_consumption {

        # memory consumed by imapsync until now in bytes
        return ( ( memory_consumption_of_pids() )[0] ) ;
}

sub debugmemory {
        my $mysync = shift ;
        if ( !$mysync->{debugmemory} ) { return q{} ; }

        my $precision = shift ;
        return ( mysprintf( "Memory consumption$precision: %.1f MiB\n", memory_consumption() / $KIBI / $KIBI ) ) ;
}

sub memory_consumption_of_pids {

        my @pid = @_ ;
        @pid = ( @pid ) ? @pid : ( $PROCESS_ID ) ;

        #myprint( "PIDs: @pid\n" ) ;
        my @val ;
        if ( 'MSWin32' eq $OSNAME ) {
                @val = memory_consumption_of_pids_win32( @pid ) ;
        }
        else {
                # Unix
                my @ps = qx{ ps -o vsz -p @pid } ;

                #myprint( @ps ) ;
                #my @ps = backtick( "ps -o vsz -p @pid" ) ;
                shift @ps ;    # First line is column name "VSZ"
                chomp @ps ;

                # convert to octets

                @val = map { $_ * $KIBI } @ps ;
        }
        return ( @val ) ;
}

sub memory_consumption_of_pids_win32 {

        # Windows
        my @PID = @_ ;
        my %PID ;

        # hash of pids as key values
        map { $PID{$_}++ } @PID ;

        # Does not work but should reading the tasklist documentation
        #@ps = qx{ tasklist /FI "PID eq @PID" };

        my @ps = qx{ tasklist /NH /FO CSV } ;

        #my @ps = backtick( 'tasklist /NH /FO CSV' ) ;
        #myprint( "-" x $STD_CHAR_PER_LINE, "\n", @ps, "-" x $STD_CHAR_PER_LINE, "\n" ) ;
        my @val ;
        foreach my $line ( @ps ) {
                my ( $name, $pid, $mem ) = ( split ',', $line )[ 0, 1, 4 ] ;
                next if ( !$pid ) ;

                #myprint( "[$name][$pid][$mem]" ) ;
                if ( $PID{ remove_qq( $pid ) } ) {

                        #myprint( "MATCH !\n" ) ;
                        chomp $mem ;
                        $mem = remove_qq( $mem ) ;
                        $mem = remove_Ko( $mem ) ;
                        $mem = remove_not_num( $mem ) ;

                        #myprint( "[$mem]\n" ) ;
                        push @val, $mem * $KIBI ;
                }
        }
        return ( @val ) ;
}

sub backtick {
        my $command = shift ;

        if ( !$command ) { return ; }

        my ( $writer, $reader, $err ) ;
        my @output ;
        my $pid ;
        eval { $pid = open3( $writer, $reader, $err, $command ) ; } ;

        if ( !$pid ) { return ; }
        waitpid( $pid, 0 ) ;
        @output = <$reader> ;    # Output here
                                 #
                                 #my @errors = <$err>;    #Errors here, instead of the console
        if ( not @output ) { return ; }
        $debugdev and myprint( @output ) ;
        if ( $output[0] =~ /\Qopen3: exec of $command failed\E/mxs ) { return ; }
        if ( wantarray ) {
                return ( @output ) ;
        }
        else {
                return ( join( q{}, @output ) ) ;
        }
}

sub tests_backtick {
        note( 'Entering tests_backtick()' ) ;

        is( undef, backtick(),      'backtick: no args' ) ;
        is( undef, backtick( q{} ), 'backtick: empty command' ) ;

      SKIP: {
                skip( 'test for MSWin32', 5 ) if ( 'MSWin32' ne $OSNAME ) ;
                my @output ;
                @output = backtick( 'echo Hello World!' ) ;

                # Add \r on Windows.
                ok( "Hello World!\r\n" eq $output[0], 'backtick: echo Hello World!' ) ;
                $debug and myprint( "[@output]" ) ;
                @output = backtick( 'echo Hello & echo World!' ) ;
                ok( "Hello \r\n" eq $output[0], 'backtick: echo Hello & echo World! line 1' ) ;
                ok( "World!\r\n" eq $output[1], 'backtick: echo Hello & echo World! line 2' ) ;
                $debug and myprint( "[@output][$output[0]][$output[1]]" ) ;

                # Scalar context
                ok( "Hello World!\r\n" eq backtick( 'echo Hello World!' ),            'backtick: echo Hello World! scalar' ) ;
                ok( "Hello \r\nWorld!\r\n" eq backtick( 'echo Hello & echo World!' ), 'backtick: echo Hello & echo World! scalar 2 lines' ) ;
        }
      SKIP: {
                skip( 'test for Unix', 7 ) if ( 'MSWin32' eq $OSNAME ) ;
                is( undef, backtick( 'aaaarrrg' ), 'backtick: aaaarrrg command not found' ) ;

                # Array context
                my @output ;
                @output = backtick( 'echo Hello World!' ) ;
                ok( "Hello World!\n" eq $output[0], 'backtick: echo Hello World!' ) ;
                $debug and myprint( "[@output]" ) ;
                @output = backtick( "echo Hello\necho World!" ) ;
                ok( "Hello\n" eq $output[0],  'backtick: echo Hello; echo World! line 1' ) ;
                ok( "World!\n" eq $output[1], 'backtick: echo Hello; echo World! line 2' ) ;
                $debug and myprint( "[@output]" ) ;

                # Scalar context
                ok( "Hello World!\n" eq backtick( 'echo Hello World!' ),        'backtick: echo Hello World! scalar' ) ;
                ok( "Hello\nWorld!\n" eq backtick( "echo Hello\necho World!" ), 'backtick: echo Hello; echo World! scalar 2 lines' ) ;

                # Return error positive value, that's ok
                is( undef, backtick( 'false' ), 'backtick: false returns no output' ) ;
        }

        note( 'Leaving  tests_backtick()' ) ;
        return ;
}

sub remove_not_num {

        my $string = shift ;
        $string =~ tr/0-9//cd ;

        #myprint( "tr [$string]\n" ) ;
        return ( $string ) ;
}

sub tests_remove_not_num {
        note( 'Entering tests_remove_not_num()' ) ;

        ok( '123' eq remove_not_num( 123 ),         'remove_not_num( 123 )' ) ;
        ok( '123' eq remove_not_num( '123' ),       q{remove_not_num( '123' )} ) ;
        ok( '123' eq remove_not_num( '12 3' ),      q{remove_not_num( '12 3' )} ) ;
        ok( '123' eq remove_not_num( 'a 12 3 Ko' ), q{remove_not_num( 'a 12 3 Ko' )} ) ;

        note( 'Leaving  tests_remove_not_num()' ) ;
        return ;
}

sub remove_Ko {
        my $string = shift ;
        if ( $string =~ /^(.*)\sKo$/xo ) {
                return ( $1 ) ;
        }
        else {
                return ( $string ) ;
        }
}

sub remove_qq {
        my $string = shift ;
        if ( $string =~ /^"(.*)"$/xo ) {
                return ( $1 ) ;
        }
        else {
                return ( $string ) ;
        }
}

sub memory_consumption_ratio {

        my ( $base ) = @_ ;
        $base ||= 1 ;
        my $consu = memory_consumption() ;
        return ( $consu / $base ) ;
}

sub date_from_rcs {
        my $d = shift ;

        my %num2mon = qw( 01 Jan 02 Feb 03 Mar 04 Apr 05 May 06 Jun 07 Jul 08 Aug 09 Sep 10 Oct 11 Nov 12 Dec ) ;
        if ( $d =~ m{(\d{4})/(\d{2})/(\d{2})\s(\d{2}):(\d{2}):(\d{2})}xo ) {

                # Handles the following format
                # 2015/07/10 11:05:59 -- Generated by RCS Date tag.
                #myprint( "$d\n"  ) ;
                #myprint( "header: [$1][$2][$3][$4][$5][$6]\n"  ) ;
                my ( $year, $month, $day, $hour, $min, $sec ) = ( $1, $2, $3, $4, $5, $6 ) ;
                $month = $num2mon{$month} ;
                $d     = "$day-$month-$year $hour:$min:$sec +0000" ;

                #myprint( "$d\n"  ) ;
        }
        return ( $d ) ;
}

sub tests_date_from_rcs {
        note( 'Entering tests_date_from_rcs()' ) ;

        ok( '19-Sep-2015 16:11:07 +0000' eq date_from_rcs( 'Date: 2015/09/19 16:11:07 ' ), 'date_from_rcs from RCS date' ) ;

        note( 'Leaving  tests_date_from_rcs()' ) ;
        return ;
}

sub good_date {

        # two incoming formats:
        # header    Tue, 24 Aug 2010 16:00:00 +0200
        # internal       24-Aug-2010 16:00:00 +0200

        # outgoing format: internal date format
        #   24-Aug-2010 16:00:00 +0200

        my $d = shift ;
        return ( q{} ) if not defined $d ;

      SWITCH: {
                if ( $d =~ m{(\d?)(\d-...-\d{4})(\s\d{2}:\d{2}:\d{2})(\s(?:\+|-)\d{4})?}xo ) {

                        #myprint( "internal: [$1][$2][$3][$4]\n"  ) ;
                        my ( $day_1, $date_rest, $hour, $zone ) = ( $1, $2, $3, $4 ) ;
                        $day_1 = '0'      if ( $day_1 eq q{} ) ;
                        $zone  = ' +0000' if not defined $zone ;
                        $d     = $day_1 . $date_rest . $hour . $zone ;
                        last SWITCH;
                }

                if ( $d =~ m{(?:\w{3,},\s)?(\d{1,2}),?\s+(\w{3,})\s+(\d{2,4})\s+(\d{1,2})(?::|\.)(\d{1,2})(?:(?::|\.)(\d{1,2}))?\s*((?:\+|-)\d{4})?}xo ) {

                        # Handles any combination of following formats
                        # Tue, 24 Aug 2010 16:00:00 +0200 -- Standard
                        # 24 Aug 2010 16:00:00 +0200 -- Missing Day of Week
                        # Tue, 24 Aug 97 16:00:00 +0200 -- Two digit year
                        # Tue, 24 Aug 1997 16.00.00 +0200 -- Periods instead of colons
                        # Tue, 24 Aug 1997  16:00:00 +0200 -- Extra whitespace between year and hour
                        # Tue, 24 Aug 1997 6:5:2 +0200 -- Single digit hour, min, or second
                        # Tue, 24, Aug 1997 16:00:00 +0200 -- Extra comma

                        #myprint( "header: [$1][$2][$3][$4][$5][$6][$7][$8]\n" ) ;
                        my ( $day, $month, $year, $hour, $min, $sec, $zone ) = ( $1, $2, $3, $4, $5, $6, $7, $8 ) ;
                        $year = '19' . $year if length( $year ) == 2 && $year =~ m/^[789]/xo ;
                        $year = '20' . $year if length( $year ) == 2 ;

                        $month = substr $month, 0, 3 if length( $month ) > 4 ;
                        $day  = mysprintf( '%02d', $day ) ;
                        $hour = mysprintf( '%02d', $hour ) ;
                        $min  = mysprintf( '%02d', $min ) ;
                        $sec = '00' if not defined $sec ;
                        $sec = mysprintf( '%02d', $sec ) ;
                        $zone = '+0000' if not defined $zone ;
                        $d = "$day-$month-$year $hour:$min:$sec $zone" ;
                        last SWITCH;
                }

                if ( $d =~ m{(?:.{3})\s(...)\s+(\d{1,2})\s(\d{1,2}):(\d{1,2}):(\d{1,2})\s(?:\w{3})?\s?(\d{4})}xo ) {

                        # Handles any combination of following formats
                        # Sun Aug 20 11:55:09 2006
                        # Wed Jan 24 11:58:38 MST 2007
                        # Wed Jan  2 08:40:57 2008

                        #myprint( "header: [$1][$2][$3][$4][$5][$6]\n" ) ;
                        my ( $month, $day, $hour, $min, $sec, $year ) = ( $1, $2, $3, $4, $5, $6 ) ;
                        $day  = mysprintf( '%02d', $day ) ;
                        $hour = mysprintf( '%02d', $hour ) ;
                        $min  = mysprintf( '%02d', $min ) ;
                        $sec  = mysprintf( '%02d', $sec ) ;
                        $d    = "$day-$month-$year $hour:$min:$sec +0000" ;
                        last SWITCH;
                }
                my %num2mon = qw( 01 Jan 02 Feb 03 Mar 04 Apr 05 May 06 Jun 07 Jul 08 Aug 09 Sep 10 Oct 11 Nov 12 Dec ) ;

                if ( $d =~ m{(\d{4})/(\d{2})/(\d{2})\s(\d{2}):(\d{2}):(\d{2})}xo ) {

                        # Handles the following format
                        # 2015/07/10 11:05:59 -- Generated by RCS Date tag.
                        #myprint( "$d\n"  ) ;
                        #myprint( "header: [$1][$2][$3][$4][$5][$6]\n"  ) ;
                        my ( $year, $month, $day, $hour, $min, $sec ) = ( $1, $2, $3, $4, $5, $6 ) ;
                        $month = $num2mon{$month} ;
                        $d     = "$day-$month-$year $hour:$min:$sec +0000" ;

                        #myprint( "$d\n"  ) ;
                        last SWITCH;
                }

                if ( $d =~ m{(\d{2})/(\d{2})/(\d{2})\s(\d{2}):(\d{2}):(\d{2})}xo ) {

                        # Handles the following format
                        # 02/06/09 22:18:08 -- Generated by AVTECH TemPageR devices

                        #myprint( "header: [$1][$2][$3][$4][$5][$6]\n" ) ;
                        my ( $month, $day, $year, $hour, $min, $sec ) = ( $1, $2, $3, $4, $5, $6 ) ;
                        $year  = '20' . $year ;
                        $month = $num2mon{$month} ;
                        $d     = "$day-$month-$year $hour:$min:$sec +0000" ;
                        last SWITCH;
                }

                if ( $d =~ m{\w{6,},\s(\w{3})\w+\s+(\d{1,2}),\s(\d{4})\s(\d{2}):(\d{2})\s(AM|PM)}xo ) {

                        # Handles the following format
                        # Saturday, December 14, 2002 05:00 PM - KBtoys.com order confirmations

                        my ( $month, $day, $year, $hour, $min, $apm ) = ( $1, $2, $3, $4, $5, $6 ) ;

                        $hour += 12 if $apm eq 'PM' ;
                        $day = mysprintf( '%02d', $day ) ;
                        $d = "$day-$month-$year $hour:$min:00 +0000" ;
                        last SWITCH;
                }

                if ( $d =~ m{(\w{3})\s(\d{1,2})\s(\d{4})\s(\d{2}):(\d{2}):(\d{2})\s((?:\+|-)\d{4})}xo ) {

                        # Handles the following format
                        # Saturday, December 14, 2002 05:00 PM - jr.com order confirmations

                        my ( $month, $day, $year, $hour, $min, $sec, $zone ) = ( $1, $2, $3, $4, $5, $6, $7 ) ;

                        $day = mysprintf( '%02d', $day ) ;
                        $d = "$day-$month-$year $hour:$min:$sec $zone" ;
                        last SWITCH;
                }

                if ( $d =~ m{(\d{1,2})-(\w{3})-(\d{4})}xo ) {

                        # Handles the following format
                        # 21-Jun-2001 - register.com domain transfer email circa 2001

                        my ( $day, $month, $year ) = ( $1, $2, $3 ) ;
                        $day = mysprintf( '%02d', $day ) ;
                        $d = "$day-$month-$year 11:11:11 +0000" ;
                        last SWITCH;
                }

                # unknown or unmatch => return same string
                return ( $d ) ;
        }

        $d = qq("$d") ;
        return ( $d ) ;
}

sub tests_good_date {
        note( 'Entering tests_good_date()' ) ;

        ok( q{} eq good_date(),                                                                       'good_date no arg' ) ;
        ok( '"24-Aug-2010 16:00:00 +0200"' eq good_date( '24-Aug-2010 16:00:00 +0200' ),              'good_date internal 2digit zone' ) ;
        ok( '"24-Aug-2010 16:00:00 +0000"' eq good_date( '24-Aug-2010 16:00:00' ),                    'good_date internal 2digit no zone' ) ;
        ok( '"01-Sep-2010 16:00:00 +0200"' eq good_date( '1-Sep-2010 16:00:00 +0200' ),               'good_date internal SP 1digit' ) ;
        ok( '"24-Aug-2010 16:00:00 +0200"' eq good_date( 'Tue, 24 Aug 2010 16:00:00 +0200' ),         'good_date header 2digit zone' ) ;
        ok( '"01-Sep-2010 16:00:00 +0000"' eq good_date( 'Wed, 1 Sep 2010 16:00:00' ),                'good_date header SP 1digit zone' ) ;
        ok( '"01-Sep-2010 16:00:00 +0200"' eq good_date( 'Wed, 1 Sep 2010 16:00:00 +0200' ),          'good_date header SP 1digit zone' ) ;
        ok( '"01-Sep-2010 16:00:00 +0200"' eq good_date( 'Wed, 1 Sep 2010 16:00:00 +0200 (CEST)' ),   'good_date header SP 1digit zone' ) ;
        ok( '"06-Feb-2009 22:18:08 +0000"' eq good_date( '02/06/09 22:18:08' ),                       'good_date header TemPageR' ) ;
        ok( '"02-Jan-2008 08:40:57 +0000"' eq good_date( 'Wed Jan  2 08:40:57 2008' ),                'good_date header dice.com support 1digit day' ) ;
        ok( '"20-Aug-2006 11:55:09 +0000"' eq good_date( 'Sun Aug 20 11:55:09 2006' ),                'good_date header dice.com support 2digit day' ) ;
        ok( '"24-Jan-2007 11:58:38 +0000"' eq good_date( 'Wed Jan 24 11:58:38 MST 2007' ),            'good_date header status-now.com' ) ;
        ok( '"24-Aug-2010 16:00:00 +0200"' eq good_date( '24 Aug 2010 16:00:00 +0200' ),              'good_date header missing date of week' ) ;
        ok( '"24-Aug-2067 16:00:00 +0200"' eq good_date( 'Tue, 24 Aug 67 16:00:00 +0200' ),           'good_date header 2digit year' ) ;
        ok( '"24-Aug-1977 16:00:00 +0200"' eq good_date( 'Tue, 24 Aug 77 16:00:00 +0200' ),           'good_date header 2digit year' ) ;
        ok( '"24-Aug-1987 16:00:00 +0200"' eq good_date( 'Tue, 24 Aug 87 16:00:00 +0200' ),           'good_date header 2digit year' ) ;
        ok( '"24-Aug-1997 16:00:00 +0200"' eq good_date( 'Tue, 24 Aug 97 16:00:00 +0200' ),           'good_date header 2digit year' ) ;
        ok( '"24-Aug-2004 16:00:00 +0200"' eq good_date( 'Tue, 24 Aug 04 16:00:00 +0200' ),           'good_date header 2digit year' ) ;
        ok( '"24-Aug-1997 16:00:00 +0200"' eq good_date( 'Tue, 24 Aug 1997 16.00.00 +0200' ),         'good_date header period time sep' ) ;
        ok( '"24-Aug-1997 16:00:00 +0200"' eq good_date( 'Tue, 24 Aug 1997  16:00:00 +0200' ),        'good_date header extra white space type1' ) ;
        ok( '"24-Aug-1997 05:06:02 +0200"' eq good_date( 'Tue, 24 Aug 1997 5:6:2 +0200' ),            'good_date header 1digit time vals' ) ;
        ok( '"24-Aug-1997 05:06:02 +0200"' eq good_date( 'Tue, 24, Aug 1997 05:06:02 +0200' ),        'good_date header extra commas' ) ;
        ok( '"01-Oct-2003 12:45:24 +0000"' eq good_date( 'Wednesday, 01 October 2003 12:45:24 CDT' ), 'good_date header no abbrev' ) ;
        ok( '"11-Jan-2005 17:58:27 -0500"' eq good_date( 'Tue,  11  Jan 2005 17:58:27 -0500' ),       'good_date extra white space' ) ;
        ok( '"18-Dec-2002 15:07:00 +0000"' eq good_date( 'Wednesday, December 18, 2002 03:07 PM' ),   'good_date kbtoys.com orders' ) ;
        ok( '"16-Dec-2004 02:01:49 -0500"' eq good_date( 'Dec 16 2004 02:01:49 -0500' ),              'good_date jr.com orders' ) ;
        ok( '"21-Jun-2001 11:11:11 +0000"' eq good_date( '21-Jun-2001' ),                             'good_date register.com domain transfer' ) ;
        ok( '"18-Nov-2012 18:34:38 +0100"' eq good_date( 'Sun, 18 Nov 2012 18:34:38 +0100' ),         'good_date pop2imap bug (Westeuropäische Normalzeit)' ) ;
        ok( '"19-Sep-2015 16:11:07 +0000"' eq good_date( 'Date: 2015/09/19 16:11:07 ' ),              'good_date from RCS date' ) ;

        note( 'Leaving  tests_good_date()' ) ;
        return ;
}

sub tests_list_keys_in_2_not_in_1 {
        note( 'Entering tests_list_keys_in_2_not_in_1()' ) ;

        my @list ;
        ok( !list_keys_in_2_not_in_1( {}, {} ), 'list_keys_in_2_not_in_1: {} {}' ) ;
        ok( 0 == compare_lists( [], [ list_keys_in_2_not_in_1( {}, {} ) ] ), 'list_keys_in_2_not_in_1: {} {}' ) ;
        ok( 0 == compare_lists( [ 'a', 'b' ], [ list_keys_in_2_not_in_1( {}, { 'a' => 1, 'b' => 1 } ) ] ), 'list_keys_in_2_not_in_1: {} {a, b}' ) ;
        ok( 0 == compare_lists( ['b'], [ list_keys_in_2_not_in_1( { 'a' => 1 }, { 'a' => 1, 'b' => 1 } ) ] ), 'list_keys_in_2_not_in_1: {a} {a, b}' ) ;
        ok( 0 == compare_lists( [], [ list_keys_in_2_not_in_1( { 'a' => 1, 'b' => 1 }, { 'a' => 1, 'b' => 1 } ) ] ), 'list_keys_in_2_not_in_1: {a, b} {a, b}' ) ;
        ok( 0 == compare_lists( [], [ list_keys_in_2_not_in_1( { 'a' => 1, 'b' => 1, 'c' => 1 }, { 'a' => 1, 'b' => 1 } ) ] ), 'list_keys_in_2_not_in_1: {a, b, c} {a, b}' ) ;
        ok( 0 == compare_lists( ['b'], [ list_keys_in_2_not_in_1( { 'a' => 1, 'c' => 1 }, { 'a' => 1, 'b' => 1 } ) ] ), 'list_keys_in_2_not_in_1: {a, b, c} {a, b}' ) ;

        note( 'Leaving  tests_list_keys_in_2_not_in_1()' ) ;
        return ;
}

sub list_keys_in_2_not_in_1 {

        my $folders1_ref = shift ;
        my $folders2_ref = shift ;
        my @list ;

        foreach my $folder ( sort keys %{$folders2_ref} ) {
                next if exists $folders1_ref->{$folder} ;
                push @list, $folder ;
        }
        return ( @list ) ;
}

sub list_folders_in_2_not_in_1 {

        my ( @h2_folders_not_in_h1, %h2_folders_not_in_h1 ) ;
        @h2_folders_not_in_h1 = list_keys_in_2_not_in_1( \%h1_folders_all, \%h2_folders_all ) ;
        map { $h2_folders_not_in_h1{$_} = 1 } @h2_folders_not_in_h1 ;
        @h2_folders_not_in_h1 = list_keys_in_2_not_in_1( \%h2_folders_from_1_all, \%h2_folders_not_in_h1 ) ;

        return ( reverse @h2_folders_not_in_h1 ) ;
}

sub tests_match {
        note( 'Entering tests_match()' ) ;

        # undef serie
        is( undef, match(),           'match: no args => undef' ) ;
        is( undef, match( 'lalala' ), 'match: one args => undef' ) ;

        # This one gives 0 under a binary made by pp
        # but 1 under "normal" Perl interpreter. So a PAR bug?
        #is( 1, match( q{}, q{} ),                'match: q{}      =~ q{}      => 1' ) ;

        is( 1, match( 'lalala',   'lalala' ),   'match: lalala   =~ lalala => 1' ) ;
        is( 1, match( 'lalala',   '^lalala' ),  'match: lalala   =~ ^lalala  => 1' ) ;
        is( 1, match( 'lalala',   'lalala$' ),  'match: lalala   =~ lalala$  => 1' ) ;
        is( 1, match( 'lalala',   '^lalala$' ), 'match: lalala   =~ ^lalala$ => 1' ) ;
        is( 1, match( '_lalala_', 'lalala' ),   'match: _lalala_ =~ lalala   => 1' ) ;
        is( 1, match( 'lalala',   '.*' ),       'match: lalala   =~ .*       => 1' ) ;
        is( 1, match( 'lalala',   '.' ),        'match: lalala   =~ .        => 1' ) ;
        is( 1, match( '/lalala/', '/lalala/' ), 'match: /lalala/ =~ /lalala/ => 1' ) ;

        is( 0, match( 'lalala',  'ooo' ),      'match: lalala   =~ ooo      => 0' ) ;
        is( 0, match( 'lalala',  'lal_ala' ),  'match: lalala   =~ lal_ala  => 0' ) ;
        is( 0, match( 'lalala',  '\.' ),       'match: lalala   =~ \.       => 0' ) ;
        is( 0, match( 'lalalaX', '^lalala$' ), 'match: lalalaX  =~ ^lalala$ => 0' ) ;
        is( 0, match( 'lalala',  '/lalala/' ), 'match: lalala   =~ /lalala/ => 1' ) ;

        is( 1, match( 'LALALA', '(?i:lalala)' ), 'match: LALALA   =~ (?i:lalala) => 1' ) ;

        is( undef, match( 'LALALA', '(?{`ls /`})' ),        'match: LALALA   =~ (?{`ls /`})       => undef' ) ;
        is( undef, match( 'LALALA', '(?{print "CACA"})' ),  'match: LALALA   =~ (?{print "CACA"})  => undef' ) ;
        is( undef, match( 'CACA',   '(??{print "CACA"})' ), 'match: CACA     =~ (??{print "CACA"}) => undef' ) ;

        note( 'Leaving  tests_match()' ) ;

        return ;
}

sub match {
        my ( $var, $regex ) = @ARG ;

        # undef cases
        if ( ( !defined $var ) or ( !defined $regex ) ) { return ; }

        # normal cases
        if ( eval { $var =~ $regex } ) {
                return 1 ;
        }
        elsif ( $EVAL_ERROR ) {
                myprint( "Fatal regex $regex\n" ) ;
                return ;
        }
        else {
                return 0 ;
        }
        return ;
}

sub tests_notmatch {
        note( 'Entering tests_notmatch()' ) ;

        # undef serie
        is( undef, notmatch(),           'notmatch: no args => undef' ) ;
        is( undef, notmatch( 'lalala' ), 'notmatch: one args => undef' ) ;

        is( 1, notmatch( 'lalala',   '/lalala/' ), 'notmatch: lalala   !~ /lalala/ => 1' ) ;
        is( 0, notmatch( '/lalala/', '/lalala/' ), 'notmatch: /lalala/ !~ /lalala/ => 0' ) ;
        is( 1, notmatch( 'lalala',   '/ooo/' ),    'notmatch: lalala   !~ /ooo/    => 1' ) ;

        # This one gives 1 under a binary made by pp
        # but 0 under "normal" Perl interpreter. So a PAR bug, same in tests_match .
        #is( 0, notmatch( q{}, q{} ),             'notmatch: q{}      !~ q{}      => 0' ) ;

        is( 0, notmatch( 'lalala',   'lalala' ),   'notmatch: lalala   !~ lalala   => 0' ) ;
        is( 0, notmatch( 'lalala',   '^lalala' ),  'notmatch: lalala   !~ ^lalala  => 0' ) ;
        is( 0, notmatch( 'lalala',   'lalala$' ),  'notmatch: lalala   !~ lalala$  => 0' ) ;
        is( 0, notmatch( 'lalala',   '^lalala$' ), 'notmatch: lalala   !~ ^lalala$ => 0' ) ;
        is( 0, notmatch( '_lalala_', 'lalala' ),   'notmatch: _lalala_ !~ lalala   => 0' ) ;
        is( 0, notmatch( 'lalala',   '.*' ),       'notmatch: lalala   !~ .*       => 0' ) ;
        is( 0, notmatch( 'lalala',   '.' ),        'notmatch: lalala   !~ .        => 0' ) ;

        is( 1, notmatch( 'lalala',  'ooo' ),      'notmatch: does not match regex => 1' ) ;
        is( 1, notmatch( 'lalala',  'lal_ala' ),  'notmatch: does not match regex => 1' ) ;
        is( 1, notmatch( 'lalala',  '\.' ),       'notmatch: matches regex => 0' ) ;
        is( 1, notmatch( 'lalalaX', '^lalala$' ), 'notmatch: does not match regex => 1' ) ;

        note( 'Leaving  tests_notmatch()' ) ;

        return ;
}

sub notmatch {
        my ( $var, $regex ) = @ARG ;

        # undef cases
        if ( ( !defined $var ) or ( !defined $regex ) ) { return ; }

        # normal cases
        if ( eval { $var !~ $regex } ) {
                return 1 ;
        }
        elsif ( $EVAL_ERROR ) {
                myprint( "Fatal regex $regex\n" ) ;
                return ;
        }
        else {
                return 0 ;
        }
        return ;
}

sub delete_folders_in_2_not_in_1 {

        foreach my $folder ( @h2_folders_not_in_1 ) {
                if ( defined $delete2foldersonly and eval "\$folder !~ $delete2foldersonly" ) {
                        myprint( "Not deleting $folder because of --delete2foldersonly $delete2foldersonly\n" ) ;
                        next ;
                }
                if ( defined $delete2foldersbutnot and eval "\$folder =~ $delete2foldersbutnot" ) {
                        myprint( "Not deleting $folder because of --delete2foldersbutnot $delete2foldersbutnot\n" ) ;
                        next ;
                }
                my $res = $sync->{dry} ;    # always success in dry mode!
                $imap2->unsubscribe( $folder ) if ( !$sync->{dry} ) ;
                $res = $imap2->delete( $folder ) if ( !$sync->{dry} ) ;
                if ( $res ) {
                        myprint( "Deleted $folder", "$sync->{dry_message}", "\n" ) ;
                }
                else {
                        myprint( "Deleting $folder failed", "\n" ) ;
                }
        }
        return ;
}

sub delete_folder {
        my ( $mysync, $imap, $folder, $Side ) = @_ ;
        if ( !$mysync ) { return ; }
        if ( !$imap )   { return ; }
        if ( !$folder ) { return ; }
        $Side ||= 'HostX' ;

        my $res = $mysync->{dry} ;    # always success in dry mode!
        if ( !$mysync->{dry} ) {
                $imap->unsubscribe( $folder ) ;
                $res = $imap->delete( $folder ) ;
        }
        if ( $res ) {
                myprint( "$Side deleted $folder", $mysync->{dry_message}, "\n" ) ;
                return 1 ;
        }
        else {
                myprint( "$Side deleting $folder failed", "\n" ) ;
                return ;
        }
}

sub delete1emptyfolders {
        my $mysync = shift ;
        if ( !$mysync ) { return ; }                           # abort if no parameter
        if ( !$mysync->{delete1emptyfolders} ) { return ; }    # abort if --delete1emptyfolders off
        my $imap = $mysync->{imap1} ;
        if ( !$imap ) { return ; }                             # abort if no imap
        if ( $imap->IsUnconnected() ) { return ; }             # abort if disconnected

        my %folders_kept ;
        myprint( qq{Host1 deleting empty folders\n} ) ;
        foreach my $folder ( reverse sort @{ $mysync->{h1_folders_wanted} } ) {
                my $parenthood = $imap->is_parent( $folder ) ;
                if ( defined $parenthood and $parenthood ) {
                        myprint( "Host1 folder $folder has subfolders\n" ) ;
                        $folders_kept{$folder}++ ;
                        next ;
                }
                my $nb_messages_select = examine_folder_and_count( $imap, $folder, 'Host1' ) ;
                if ( !defined $nb_messages_select ) { next ; }    # Select failed => Neither continue nor keep this folder }
                my $nb_messages_search = scalar( @{ $imap->messages() } ) ;
                if ( 0 != $nb_messages_select and 0 != $nb_messages_search ) {
                        myprint( "Host1 folder $folder has messages: $nb_messages_search (search) $nb_messages_select (select)\n" ) ;
                        $folders_kept{$folder}++ ;
                        next ;
                }
                if ( 0 != $nb_messages_select + $nb_messages_search ) {
                        myprint( "Host1 folder $folder odd messages count: $nb_messages_search (search) $nb_messages_select (select)\n" ) ;
                        $folders_kept{$folder}++ ;
                        next ;
                }

                # Here we must have 0 messages by messages() aka "SEARCH ALL" and also "EXAMINE"
                if ( uc $folder eq 'INBOX' ) {
                        myprint( "Host1 Not deleting $folder\n" ) ;
                        $folders_kept{$folder}++ ;
                        next ;
                }
                myprint( "Host1 deleting empty folder $folder\n" ) ;

                # can not delete a SELECTed or EXAMINEd folder so closing it
                # could changed be SELECT INBOX
                $imap->close() ;    # close after examine does not expunge; anyway expunging an empty folder...
                if ( delete_folder( $mysync, $imap, $folder, 'Host1' ) ) {
                        next ;      # Deleted, good!
                }
                else {
                        $folders_kept{$folder}++ ;
                        next ;      # Not deleted, bad!
                }
        }
        remove_deleted_folders_from_wanted_list( $mysync, %folders_kept ) ;
        myprint( qq{Host1 ended deleting empty folders\n} ) ;
        return ;
}

sub remove_deleted_folders_from_wanted_list {
        my ( $mysync, %folders_kept ) = @ARG ;

        my @h1_folders_wanted_init = @{ $mysync->{h1_folders_wanted} } ;
        my @h1_folders_wanted_last ;
        foreach my $folder ( @h1_folders_wanted_init ) {
                if ( $folders_kept{$folder} ) {
                        push @h1_folders_wanted_last, $folder ;
                }
        }
        @{ $mysync->{h1_folders_wanted} } = @h1_folders_wanted_last ;
        return ;
}

sub examine_folder_and_count {
        my ( $imap, $folder, $Side ) = @_ ;
        $Side ||= 'HostX' ;

        if ( !examine_folder( $imap, $folder, $Side ) ) {
                return ;
        }
        my $nb_messages_select = count_from_select( $imap->History ) ;
        return $nb_messages_select ;
}

sub tests_delete1emptyfolders {
        note( 'Entering tests_delete1emptyfolders()' ) ;

        is( undef, delete1emptyfolders(), q{delete1emptyfolders: undef} ) ;
        my $syncT ;
        is( undef, delete1emptyfolders( $syncT ), q{delete1emptyfolders: undef 2} ) ;
        my $imapT ;
        $syncT->{imap1} = $imapT ;
        is( undef, delete1emptyfolders( $syncT ), q{delete1emptyfolders: undef imap} ) ;

        require Test::MockObject ;
        $imapT = Test::MockObject->new() ;
        $syncT->{imap1} = $imapT ;

        $imapT->set_true( 'IsUnconnected' ) ;
        is( undef, delete1emptyfolders( $syncT ), q{delete1emptyfolders: Unconnected imap} ) ;

        # Now connected tests
        $imapT->set_false( 'IsUnconnected' ) ;
        $imapT->mock( 'LastError', sub { q{LastError mocked} } ) ;

        $syncT->{delete1emptyfolders} = 0 ;
        tests_delete1emptyfolders_unit( $syncT, [qw{ INBOX DELME1 DELME2 }], [qw{ INBOX DELME1 DELME2 }], q{tests_delete1emptyfolders: --delete1emptyfolders OFF} ) ;

        # All are parents => no deletion at all
        $imapT->set_true( 'is_parent' ) ;
        $syncT->{delete1emptyfolders} = 1 ;
        tests_delete1emptyfolders_unit( $syncT, [qw{ INBOX DELME1 DELME2 }], [qw{ INBOX DELME1 DELME2 }], q{tests_delete1emptyfolders: --delete1emptyfolders ON} ) ;

        # No parents but examine false for all => skip all
        $imapT->set_false( 'is_parent', 'examine' ) ;

        tests_delete1emptyfolders_unit( $syncT, [qw{ INBOX DELME1 DELME2 }], [], q{tests_delete1emptyfolders: EXAMINE fails} ) ;

        # examine ok for all but History bad => skip all
        $imapT->set_true( 'examine' ) ;
        $imapT->mock( 'History', sub { ( q{History badly mocked} ) } ) ;
        tests_delete1emptyfolders_unit( $syncT, [qw{ INBOX DELME1 DELME2 }], [], q{tests_delete1emptyfolders: examine ok but History badly mocked so count messages fails} ) ;

        # History good but some messages EXISTS == messages() => no deletion
        $imapT->mock( 'History',  sub { ( q{* 2 EXISTS} ) } ) ;
        $imapT->mock( 'messages', sub { [qw{ UID_1 UID_2 }] } ) ;
        tests_delete1emptyfolders_unit( $syncT, [qw{ INBOX DELME1 DELME2 }], [qw{ INBOX DELME1 DELME2 }], q{tests_delete1emptyfolders: History EXAMINE ok, several messages} ) ;

        # 0 EXISTS but != messages() => no deletion
        $imapT->mock( 'History',  sub { ( q{* 0 EXISTS} ) } ) ;
        $imapT->mock( 'messages', sub { [qw{ UID_1 UID_2 }] } ) ;
        tests_delete1emptyfolders_unit( $syncT, [qw{ INBOX DELME1 DELME2 }], [qw{ INBOX DELME1 DELME2 }], q{tests_delete1emptyfolders: 0 EXISTS but 2 by messages()} ) ;

        # 1 EXISTS but != 0 == messages() => no deletion
        $imapT->mock( 'History',  sub { ( q{* 1 EXISTS} ) } ) ;
        $imapT->mock( 'messages', sub { [] } ) ;
        tests_delete1emptyfolders_unit( $syncT, [qw{ INBOX DELME1 DELME2 }], [qw{ INBOX DELME1 DELME2 }], q{tests_delete1emptyfolders: 1 EXISTS but 0 by messages()} ) ;

        # 0 EXISTS and 0 == messages() => deletion except INBOX
        $imapT->mock( 'History',  sub { ( q{* 0 EXISTS} ) } ) ;
        $imapT->mock( 'messages', sub { [] } ) ;
        $imapT->set_true( qw{ delete close unsubscribe } ) ;
        $syncT->{dry_message} = q{ (not really since in a mocked test)} ;
        tests_delete1emptyfolders_unit( $syncT, [qw{ INBOX DELME1 DELME2 }], [qw{ INBOX }], q{tests_delete1emptyfolders: 0 EXISTS 0 by messages() delete folders, keep INBOX} ) ;

        note( 'Leaving  tests_delete1emptyfolders()' ) ;
        return ;
}

sub tests_delete1emptyfolders_unit {
        note( 'Entering tests_delete1emptyfolders_unit()' ) ;

        my $syncT                    = shift ;
        my $folders1wanted_init_ref  = shift ;
        my $folders1wanted_after_ref = shift ;
        my $comment                  = shift || q{delete1emptyfolders:} ;

        my @folders1wanted_init  = @{$folders1wanted_init_ref} ;
        my @folders1wanted_after = @{$folders1wanted_after_ref} ;

        @{ $syncT->{h1_folders_wanted} } = @folders1wanted_init ;

        is_deeply( $syncT->{h1_folders_wanted}, \@folders1wanted_init, qq{$comment, init check} ) ;
        delete1emptyfolders( $syncT ) ;
        is_deeply( $syncT->{h1_folders_wanted}, \@folders1wanted_after, qq{$comment, after check} ) ;

        note( 'Leaving  tests_delete1emptyfolders_unit()' ) ;
        return ;
}

sub extract_header {
        my $string = shift ;

        my ( $header ) = split /\n\n/x, $string ;
        if ( !$header ) { return ( q{} ) ; }

        #myprint( "[$header]\n"  ) ;
        return ( $header ) ;
}

sub tests_extract_header {
        note( 'Entering tests_extract_header()' ) ;

        my $h = <<'EOM';
Message-Id: <20100428101817.A66CB162474E@plume.est.belle>
Date: Wed, 28 Apr 2010 12:18:17 +0200 (CEST)
From: gilles@louloutte.dyndns.org (Gilles LAMIRAL)
EOM
        chomp $h ;
        ok(
                $h eq extract_header(
                        <<'EOM'
Message-Id: <20100428101817.A66CB162474E@plume.est.belle>
Date: Wed, 28 Apr 2010 12:18:17 +0200 (CEST)
From: gilles@louloutte.dyndns.org (Gilles LAMIRAL)

body
lalala
EOM
                ),
                'extract_header: 1'
        ) ;

        note( 'Leaving  tests_extract_header()' ) ;
        return ;
}

sub decompose_header {
        my $string = shift ;

        # a hash, for a keyword header KEY value are list of strings [VAL1, VAL1_other, etc]
        # Think of multiple "Received:" header lines.
        my $header = {} ;

        my ( $key, $val ) ;
        my @line = split /\n|\r\n/x, $string ;
        foreach my $line ( @line ) {

                #myprint( "DDD $line\n"  ) ;
                # End of header
                last if ( $line =~ m{^$}xo ) ;

                # Key: value
                if ( $line =~ m/(^[^:]+):\s(.*)/xo ) {
                        $key = $1 ;
                        $val = $2 ;
                        $debugdev and myprint( "DDD KV [$key] [$val]\n" ) ;
                        push @{ $header->{$key} }, $val ;

                        # blanc and value => value from previous line continues
                }
                elsif ( $line =~ m/^(\s+)(.*)/xo ) {
                        $val = $2 ;
                        $debugdev and myprint( "DDD  V [$val]\n" ) ;
                        @{ $header->{$key} }[$LAST] .= " $val" if $key ;

                        # dirty line?
                }
                else {
                        next ;
                }
        }

        #myprint( Data::Dumper->Dump( [ $header ] )  ) ;

        return ( $header ) ;
}

sub tests_decompose_header {
        note( 'Entering tests_decompose_header()' ) ;

        my $header_dec ;

        $header_dec = decompose_header(
                <<'EOH'
KEY_1: VAL_1
KEY_2: VAL_2
  VAL_2_+
        VAL_2_++
KEY_3: VAL_3
KEY_1: VAL_1_other
KEY_4: VAL_4
        VAL_4_+
KEY_5 BLANC:  VAL_5

KEY_6_BAD_BODY: VAL_6
EOH
        ) ;

        ok( 'VAL_3' eq $header_dec->{'KEY_3'}[0], 'decompose_header: VAL_3' ) ;

        ok( 'VAL_1' eq $header_dec->{'KEY_1'}[0], 'decompose_header: VAL_1' ) ;

        ok( 'VAL_1_other' eq $header_dec->{'KEY_1'}[1], 'decompose_header: VAL_1_other' ) ;

        ok( 'VAL_2 VAL_2_+ VAL_2_++' eq $header_dec->{'KEY_2'}[0], 'decompose_header: VAL_2 VAL_2_+ VAL_2_++' ) ;

        ok( 'VAL_4 VAL_4_+' eq $header_dec->{'KEY_4'}[0], 'decompose_header: VAL_4 VAL_4_+' ) ;

        ok( ' VAL_5' eq $header_dec->{'KEY_5 BLANC'}[0], 'decompose_header: KEY_5 BLANC' ) ;

        ok( not( defined $header_dec->{'KEY_6_BAD_BODY'}[0] ), 'decompose_header: KEY_6_BAD_BODY' ) ;

        $header_dec = decompose_header(
                <<'EOH'
Message-Id: <20100428101817.A66CB162474E@plume.est.belle>
Date: Wed, 28 Apr 2010 12:18:17 +0200 (CEST)
From: gilles@louloutte.dyndns.org (Gilles LAMIRAL)
EOH
        ) ;

        ok( '<20100428101817.A66CB162474E@plume.est.belle>' eq $header_dec->{'Message-Id'}[0], 'decompose_header: 1' ) ;

        $header_dec = decompose_header(
                <<'EOH'
Return-Path: <gilles@louloutte.dyndns.org>
Received: by plume.est.belle (Postfix, from userid 1000)
        id 120A71624742; Wed, 28 Apr 2010 01:46:40 +0200 (CEST)
Subject: test:eekahceishukohpe
EOH
        ) ;
        ok( 'by plume.est.belle (Postfix, from userid 1000) id 120A71624742; Wed, 28 Apr 2010 01:46:40 +0200 (CEST)' eq $header_dec->{'Received'}[0], 'decompose_header: 2' ) ;

        $header_dec = decompose_header(
                <<'EOH'
Received: from plume (localhost [127.0.0.1])
        by plume.est.belle (Postfix) with ESMTP id C6EB73F6C9
        for <gilles@localhost>; Mon, 26 Nov 2007 10:39:06 +0100 (CET)
Received: from plume [192.168.68.7]
        by plume with POP3 (fetchmail-6.3.6)
        for <gilles@localhost> (single-drop); Mon, 26 Nov 2007 10:39:06 +0100 (CET)
EOH
        ) ;
        ok( 'from plume (localhost [127.0.0.1]) by plume.est.belle (Postfix) with ESMTP id C6EB73F6C9 for <gilles@localhost>; Mon, 26 Nov 2007 10:39:06 +0100 (CET)' eq $header_dec->{'Received'}[0], 'decompose_header: 3' ) ;
        ok( 'from plume [192.168.68.7] by plume with POP3 (fetchmail-6.3.6) for <gilles@localhost> (single-drop); Mon, 26 Nov 2007 10:39:06 +0100 (CET)' eq $header_dec->{'Received'}[1],             'decompose_header: 3' ) ;

        # Bad header beginning with a blank character
        $header_dec = decompose_header(
                <<'EOH'
 KEY_1: VAL_1
KEY_2: VAL_2
  VAL_2_+
        VAL_2_++
KEY_3: VAL_3
KEY_1: VAL_1_other
EOH
        ) ;

        ok( 'VAL_3' eq $header_dec->{'KEY_3'}[0], 'decompose_header: Bad header VAL_3' ) ;

        ok( 'VAL_1_other' eq $header_dec->{'KEY_1'}[0], 'decompose_header: Bad header VAL_1_other' ) ;

        ok( 'VAL_2 VAL_2_+ VAL_2_++' eq $header_dec->{'KEY_2'}[0], 'decompose_header: Bad header VAL_2 VAL_2_+ VAL_2_++' ) ;

        note( 'Leaving  tests_decompose_header()' ) ;
        return ;
}

sub tests_epoch {
        note( 'Entering tests_epoch()' ) ;

        ok( '1282658400' eq epoch( '24-Aug-2010 16:00:00 +0200' ), 'epoch 24-Aug-2010 16:00:00 +0200 -> 1282658400' ) ;
        ok( '1282658400' eq epoch( '24-Aug-2010 14:00:00 +0000' ), 'epoch 24-Aug-2010 14:00:00 +0000 -> 1282658400' ) ;
        ok( '1282658400' eq epoch( '24-Aug-2010 12:00:00 -0200' ), 'epoch 24-Aug-2010 12:00:00 -0200 -> 1282658400' ) ;
        ok( '1282658400' eq epoch( '24-Aug-2010 16:01:00 +0201' ), 'epoch 24-Aug-2010 16:01:00 +0201 -> 1282658400' ) ;
        ok( '1282658400' eq epoch( '24-Aug-2010 14:01:00 +0001' ), 'epoch 24-Aug-2010 14:01:00 +0001 -> 1282658400' ) ;

        ok( '1280671200' eq epoch( '1-Aug-2010 16:00:00 +0200' ), 'epoch 1-Aug-2010 16:00:00 +0200 -> 1280671200' ) ;
        ok( '1280671200' eq epoch( '1-Aug-2010 14:00:00 +0000' ), 'epoch 1-Aug-2010 14:00:00 +0000 -> 1280671200' ) ;
        ok( '1280671200' eq epoch( '1-Aug-2010 12:00:00 -0200' ), 'epoch 1-Aug-2010 12:00:00 -0200 -> 1280671200' ) ;
        ok( '1280671200' eq epoch( '1-Aug-2010 16:01:00 +0201' ), 'epoch 1-Aug-2010 16:01:00 +0201 -> 1280671200' ) ;
        ok( '1280671200' eq epoch( '1-Aug-2010 14:01:00 +0001' ), 'epoch 1-Aug-2010 14:01:00 +0001 -> 1280671200' ) ;

        is( '1280671200', epoch( '1-Aug-2010 14:01:00 +0001' ),  'epoch 1-Aug-2010 14:01:00 +0001 -> 1280671200' ) ;
        is( '946684800',  epoch( '00-Jan-0000 00:00:00 +0000' ), 'epoch 1-Aug-2010 14:01:00 +0001 -> 1280671200' ) ;

        note( 'Leaving  tests_epoch()' ) ;
        return ;
}

sub epoch {

        # incoming format:
        # internal date 24-Aug-2010 16:00:00 +0200

        # outgoing format: epoch

        my $d = shift ;
        return ( q{} ) if not defined $d ;

        my ( $mday, $month, $year, $hour, $min, $sec, $sign, $zone_h, $zone_m ) ;
        my $time ;

        if ( $d =~ m{(\d{1,2})-([A-Z][a-z]{2})-(\d{4})\s(\d{2}):(\d{2}):(\d{2})\s((?:\+|-))(\d{2})(\d{2})}xo ) {

                #myprint( "internal: [$1][$2][$3][$4][$5][$6][$7][$8][$9]\n"  ) ;
                ( $mday, $month, $year, $hour, $min, $sec, $sign, $zone_h, $zone_m ) = ( $1, $2, $3, $4, $5, $6, $7, $8, $9 ) ;

                #myprint( "( $mday, $month, $year, $hour, $min, $sec, $sign, $zone_h, $zone_m )\n"  ) ;

                $sign = +1         if ( '+' eq $sign ) ;
                $sign = $MINUS_ONE if ( '-' eq $sign ) ;

                if ( 0 == $mday ) {
                        myprint( "buggy day in $d. Fixed to 01\n" ) ;
                        $mday = '01' ;
                }
                $time = timegm( $sec, $min, $hour, $mday, $month_abrev{$month}, $year ) - $sign * ( 3600 * $zone_h + 60 * $zone_m ) ;

                #myprint( "$time ", scalar localtime($time), "\n");
        }
        return ( $time ) ;
}

sub tests_add_header {
        note( 'Entering tests_add_header()' ) ;

        ok( 'Message-Id: <mistake@imapsync>' eq add_header(),                'add_header no arg' ) ;
        ok( 'Message-Id: <123456789@imapsync>' eq add_header( '123456789' ), 'add_header 123456789' ) ;

        note( 'Leaving  tests_add_header()' ) ;
        return ;
}

sub add_header {
        my $header_uid = shift || 'mistake' ;
        my $header_Message_Id = 'Message-Id: <' . $header_uid . '@imapsync>' ;
        return ( $header_Message_Id ) ;
}

sub tests_max_line_length {
        note( 'Entering tests_max_line_length()' ) ;

        ok( 0 == max_line_length( q{} ),                'max_line_length: 0 == null string' ) ;
        ok( 1 == max_line_length( "\n" ),               'max_line_length: 1 == \n' ) ;
        ok( 1 == max_line_length( "\n\n" ),             'max_line_length: 1 == \n\n' ) ;
        ok( 1 == max_line_length( "\n" x 500 ),         'max_line_length: 1 == 500 \n' ) ;
        ok( 1 == max_line_length( 'a' ),                'max_line_length: 1 == a' ) ;
        ok( 2 == max_line_length( "a\na" ),             'max_line_length: 2 == a\na' ) ;
        ok( 2 == max_line_length( "a\na\n" ),           'max_line_length: 2 == a\na\n' ) ;
        ok( 3 == max_line_length( "a\nab\n" ),          'max_line_length: 3 == a\nab\n' ) ;
        ok( 3 == max_line_length( "a\nab\n" x 10_000 ), 'max_line_length: 3 == 10_000 a\nab\n' ) ;
        ok( 3 == max_line_length( "a\nab\nabc" ),       'max_line_length: 3 == a\nab\nabc' ) ;

        ok( 4 == max_line_length( "a\nab\nabc\n" ),                                                   'max_line_length: 4 == a\nab\nabc\n' ) ;
        ok( 5 == max_line_length( "a\nabcd\nabc\n" ),                                                 'max_line_length: 5 == a\nabcd\nabc\n' ) ;
        ok( 5 == max_line_length( "a\nabcd\nabc\n\nabcd\nabcd\nabcd\nabcd\nabcd\nabcd\nabcd\nabcd" ), 'max_line_length: 5 == a\nabcd\nabc\n\nabcd\nabcd\nabcd\nabcd\nabcd\nabcd\nabcd\nabcd' ) ;

        note( 'Leaving  tests_max_line_length()' ) ;
        return ;
}

sub max_line_length {
        my $string = shift ;
        my $max    = 0 ;

        while ( $string =~ m/([^\n]*\n?)/msxg ) {
                $max = max( $max, length $1 ) ;
        }
        return ( $max ) ;
}

sub tests_setlogfile {
        note( 'Entering tests_setlogfile()' ) ;

        my $mysync = {} ;
        $mysync->{logdir}  = 'vallogdir' ;
        $mysync->{logfile} = 'vallogfile.txt' ;
        is( 'vallogdir/vallogfile.txt', setlogfile( $mysync ), 'setlogfile: logdir vallogdir, logfile vallogfile.txt, vallogdir/vallogfile.txt' ) ;

      SKIP: {
                skip( 'Too hard to have a well known timezone on Windows', 7 ) if ( 'MSWin32' eq $OSNAME ) ;

                local $ENV{TZ} = 'GMT' ;

                $mysync = { timestart => 2, } ;

                is( 'LOG_imapsync/1970_01_01_00_00_02_000__.txt', setlogfile( $mysync ), 'setlogfile: default is like LOG_imapsync/1970_01_01_00_00_02_000__.txt' ) ;

                $mysync = {
                        timestart => 2,
                        user1     => 'user1',
                        user2     => 'user2',
                        abort     => 1,
                } ;

                is( 'LOG_imapsync/1970_01_01_00_00_02_000_user1_user2_abort.txt', setlogfile( $mysync ), 'setlogfile: default is like LOG_imapsync/1970_01_01_00_00_02_000_user1_user2_abort.txt' ) ;

                $mysync = {
                        timestart => 2,
                        user1     => 'user1',
                        user2     => 'user2',
                } ;

                is( 'LOG_imapsync/1970_01_01_00_00_02_000_user1_user2.txt', setlogfile( $mysync ), 'setlogfile: default is like LOG_imapsync/1970_01_01_00_00_02_000_user1_user2.txt' ) ;

                $mysync->{logdir}  = undef ;
                $mysync->{logfile} = undef ;
                is( 'LOG_imapsync/1970_01_01_00_00_02_000_user1_user2.txt', setlogfile( $mysync ), 'setlogfile: logdir undef, LOG_imapsync/1970_01_01_00_00_02_000_user1_user2.txt' ) ;

                $mysync->{logdir}  = q{} ;
                $mysync->{logfile} = undef ;
                is( '1970_01_01_00_00_02_000_user1_user2.txt', setlogfile( $mysync ), 'setlogfile: logdir empty, 1970_01_01_00_00_02_000_user1_user2.txt' ) ;

                $mysync->{logdir}  = 'vallogdir' ;
                $mysync->{logfile} = undef ;
                is( 'vallogdir/1970_01_01_00_00_02_000_user1_user2.txt', setlogfile( $mysync ), 'setlogfile: logdir vallogdir, vallogdir/1970_01_01_00_00_02_000_user1_user2.txt' ) ;

                $mysync = {
                        user1 => 'us/er1a*|?:"<>b',
                        user2 => 'u/ser2a*|?:"<>b',
                } ;

                is( 'LOG_imapsync/1970_01_01_00_00_00_000_us_er1a_______b_u_ser2a_______b.txt', setlogfile( $mysync ), 'setlogfile: logdir undef, LOG_imapsync/1970_01_01_00_00_00_000_us_er1a_______b_u_ser2a_______b.txt' ) ;

        }

        note( 'Leaving  tests_setlogfile()' ) ;
        return ;
}

sub setlogfile {
        my ( $mysync ) = shift ;

        # When aborting another process the log file name finishes with "_abort.txt"
        my $abort_suffix = ( $mysync->{abort} ) ? '_abort' : q{} ;

        my $suffix = ( filter_forbidden_characters( move_slash( $mysync->{user1} ) ) || q{} ) . '_' . ( filter_forbidden_characters( move_slash( $mysync->{user2} ) ) || q{} ) . $abort_suffix ;

        $mysync->{logdir} = defined $mysync->{logdir} ? $mysync->{logdir} : 'LOG_imapsync' ;
        $mysync->{logfile} =
          defined $mysync->{logfile}
          ? "$mysync->{logdir}/$mysync->{logfile}"
          : logfile( $mysync->{timestart}, $suffix, $mysync->{logdir} ) ;

        #myprint( "logdir  = $mysync->{logdir}\n"  ) ;
        #myprint( "logfile = $mysync->{logfile}\n"  ) ;
        return ( $mysync->{logfile} ) ;
}

sub tests_logfile {
        note( 'Entering tests_logfile()' ) ;

      SKIP: {
                # Too hard to have a well known timezone on Windows
                skip( 'Too hard to have a well known timezone on Windows', 8 ) if ( 'MSWin32' eq $OSNAME ) ;

                local $ENV{TZ} = 'GMT' ;
                {
                        POSIX::tzset unless ( 'MSWin32' eq $OSNAME ) ;
                        is( '1970_01_01_00_00_00_000.txt', logfile(),                'logfile: no args    => 1970_01_01_00_00_00.txt' ) ;
                        is( '1970_01_01_00_00_00_000.txt', logfile( 0 ),             'logfile: 0          => 1970_01_01_00_00_00.txt' ) ;
                        is( '1970_01_01_00_01_01_000.txt', logfile( 61 ),            'logfile: 0          => 1970_01_01_00_01_01.txt' ) ;
                        is( '1970_01_01_00_01_01_234.txt', logfile( 61.234 ),        'logfile: 0          => 1970_01_01_00_01_01.txt' ) ;
                        is( '2010_08_24_14_00_00_000.txt', logfile( 1_282_658_400 ), 'logfile: 1_282_658_400 => 2010_08_24_14_00_00.txt' ) ;
                        is( '2010_08_24_14_01_01_000.txt', logfile( 1_282_658_461 ), 'logfile: 1_282_658_461 => 2010_08_24_14_01_01.txt' ) ;
                        is( '2010_08_24_14_01_01_000_poupinette.txt',   logfile( 1_282_658_461, 'poupinette' ),         'logfile: 1_282_658_461 poupinette => 2010_08_24_14_01_01_poupinette.txt' ) ;
                        is( '2010_08_24_14_01_01_000_removeblanks.txt', logfile( 1_282_658_461, '   remove blanks  ' ), 'logfile: 1_282_658_461   remove blanks   => 2010_08_24_14_01_01_000_removeblanks' ) ;
                }
                POSIX::tzset unless ( 'MSWin32' eq $OSNAME ) ;
        }

        note( 'Leaving  tests_logfile()' ) ;
        return ;
}

sub logfile {
        my ( $time, $suffix, $dir ) = @_ ;

        $time   ||= 0 ;
        $suffix ||= q{} ;
        $suffix =~ tr/ //ds ;
        my $sep_suffix = ( $suffix ) ? '_' : q{} ;
        $dir ||= q{} ;
        my $sep_dir = ( $dir ) ? '/' : q{} ;

        my $date_str = POSIX::strftime( '%Y_%m_%d_%H_%M_%S', localtime $time ) ;

        # Because of ab tests or web access, more than one sync withing one second is possible
        # so we add also milliseconds
        $date_str .= sprintf "_%03d", ( $time - int( $time ) ) * 1000 ;    # without rounding
        my $logfile = "${dir}${sep_dir}${date_str}${sep_suffix}${suffix}.txt" ;
        $debug and myprint( "date_str: $date_str\n" ) ;
        $debug and myprint( "logfile : $logfile\n" ) ;
        return ( $logfile ) ;
}

sub tests_move_slash {
        note( 'Entering tests_move_slash()' ) ;

        is( undef,       move_slash(),              'move_slash: no parameters => undef' ) ;
        is( '_',         move_slash( '/' ),         'move_slash: / => _' ) ;
        is( '_abc_def_', move_slash( '/abc/def/' ), 'move_slash: /abc/def/ => _abc_def_' ) ;
        note( 'Leaving  tests_move_slash()' ) ;
        return ;
}

sub move_slash {
        my $string = shift ;

        if ( !defined $string ) { return ; }

        $string =~ tr{/}{_} ;

        return ( $string ) ;
}

sub tests_million_folders_baby_2 {
        note( 'Entering tests_million_folders_baby_2()' ) ;

        my %long ;
        @long{ 1 .. 900_000 } = ( 1 ) x 900_000 ;

        #myprint( %long, "\n"  ) ;
        my $pasglop = 0 ;
        foreach my $elem ( 1 .. 900_000 ) {

                #$debug and myprint( "$elem "  ) ;
                if ( not exists $long{$elem} ) {
                        $pasglop++ ;
                }
        }
        ok( 0 == $pasglop, 'tests_million_folders_baby_2: search among 900_000' ) ;

        # myprint( "$pasglop\n"  ) ;

        note( 'Leaving  tests_million_folders_baby_2()' ) ;
        return ;
}

sub tests_always_fail {
        note( 'Entering tests_always_fail()' ) ;

        is( 0, 1, 'always_fail: 0 is 1' ) ;

        note( 'Leaving  tests_always_fail()' ) ;
        return ;
}

sub logfileprepa {
        my $logfile = shift ;

        my $dirname = dirname( $logfile ) ;
        do_valid_directory( $dirname ) || return ( 0 ) ;
        return ( 1 ) ;
}

sub teelaunch {
        my $mysync  = shift ;
        my $logfile = $mysync->{logfile} ;
        logfileprepa( $logfile ) || croak "Error no valid directory to write log file $logfile : $OS_ERROR" ;

        open my $logfile_handle, '>', $logfile
          or croak( "Can not open $logfile for write: $OS_ERROR" ) ;
        my $tee = IO::Tee->new( $logfile_handle, \*STDOUT ) ;
        *STDERR = *$tee{IO} ;
        select $tee ;
        $tee->autoflush( 1 ) ;
        $mysync->{logfile_handle} = $logfile_handle ;
        $mysync->{tee}            = $tee ;
        return $logfile_handle ;
}

sub getpwuid_any_os {
        my $uid = shift ;

        return ( scalar getlogin ) if ( 'MSWin32' eq $OSNAME ) ;    # Windows system
        return ( scalar getpwuid $uid ) ;                           # Unix system

}

sub simulong {
        my $max_seconds = shift ;
        my $division    = 5 ;
        my $last        = $division * $max_seconds ;
        foreach my $i ( 1 .. ( $last ) ) {
                myprint( "Are you still here $i/$last\n" ) ;

                #myprint( "Are you still here $i/$last\n" . ( "Ah" x 40 . "\n") x 4000 ) ;
                sleep( 1 / $division ) ;
        }

        return ;
}

sub printenv {
        myprint( "Environment variables listing:\n", ( map { "$_ => $ENV{$_}\n" } sort keys %ENV ), "Environment variables listing end\n" ) ;
        return ;
}

sub testsexit {
        my $mysync = shift ;
        if ( !( $mysync->{tests} or $mysync->{testsdebug} or $mysync->{testsunit} ) ) {
                return ;
        }
        my $test_builder = Test::More->builder ;
        tests( $mysync ) ;
        testsdebug( $mysync ) ;
        testunitsession( $mysync ) ;

        my @summary           = $test_builder->summary() ;
        my @details           = $test_builder->details() ;
        my $nb_tests_run      = scalar( @summary ) ;
        my $nb_tests_expected = $test_builder->expected_tests() ;
        my $nb_tests_failed   = count_0s( @summary ) ;
        my $tests_failed      = report_failures( @details ) ;
        if ( $nb_tests_failed or ( $nb_tests_run != $nb_tests_expected ) ) {

                #$test_builder->reset(  ) ;
                myprint( "Summary of tests: failed $nb_tests_failed tests, run $nb_tests_run tests, expected to run $nb_tests_expected tests.\n", "List of failed tests:\n", $tests_failed ) ;
                exit $EXIT_TESTS_FAILED ;
        }
        exit ;

        #return ;
}

sub after_get_options {
        my $numopt = shift ;

        # exit with --help option or no option at all
        $debug and myprint( "numopt:$numopt\n" ) ;
        myprint( usage( $sync ) ) and exit if ( $help or not $numopt ) ;

        return ;
}

sub easyany {
        my $mysync = shift ;

        # Gmail
        if ( $mysync->{gmail1} and $mysync->{gmail2} ) {
                $debug and myprint( "gmail1 gmail2\n" ) ;
                gmail12( $mysync ) ;
                return ;
        }
        if ( $mysync->{gmail1} ) {
                $debug and myprint( "gmail1\n" ) ;
                gmail1( $mysync ) ;
        }
        if ( $mysync->{gmail2} ) {
                $debug and myprint( "gmail2\n" ) ;
                gmail2( $mysync ) ;
        }

        # Office 365
        if ( $mysync->{office1} ) {
                office1( $mysync ) ;
        }

        if ( $mysync->{office2} ) {
                office2( $mysync ) ;
        }

        # Domino
        if ( $mysync->{domino1} ) {
                domino1( $mysync ) ;
        }

        if ( $mysync->{domino2} ) {
                domino2( $mysync ) ;
        }

        return ;
}

# From https://imapsync.lamiral.info/FAQ.d/FAQ.Gmail.txt
sub gmail12 {
        my $mysync = shift ;

        # Gmail at host1 and host2
        $mysync->{host1} ||= 'imap.gmail.com' ;
        $mysync->{ssl1} = ( defined $mysync->{ssl1} ) ? $mysync->{ssl1} : 1 ;
        $mysync->{host2} ||= 'imap.gmail.com' ;
        $mysync->{ssl2} = ( defined $mysync->{ssl2} ) ? $mysync->{ssl2} : 1 ;
        $mysync->{maxbytespersecond} ||= 20_000 ;      # should be 10_000 computed from by Gmail documentation
        $mysync->{maxbytesafter} ||= 1_000_000_000 ;
        $mysync->{automap} = ( defined $mysync->{automap} ) ? $mysync->{automap} : 1 ;
        $mysync->{maxsleep} = $MAX_SLEEP ;

        push @exclude, '\[Gmail\]$' ;
        return ;
}

sub gmail1 {
        my $mysync = shift ;

        # Gmail at host2
        $mysync->{host1} ||= 'imap.gmail.com' ;
        $mysync->{ssl1} = ( defined $mysync->{ssl1} ) ? $mysync->{ssl1} : 1 ;
        $mysync->{maxbytespersecond} ||= 40_000 ;      # should be 20_000 computed from by Gmail documentation
        $mysync->{maxbytesafter} ||= 2_500_000_000 ;
        $mysync->{automap}   = ( defined $mysync->{automap} )   ? $mysync->{automap}   : 1 ;
        $skipcrossduplicates = ( defined $skipcrossduplicates ) ? $skipcrossduplicates : 1 ;
        $mysync->{maxsleep}  = $MAX_SLEEP ;

        push @useheader, 'X-Gmail-Received', 'Message-Id' ;
        push @regextrans2, 's,\[Gmail\].,,' ;
        push @folderlast,  '[Gmail]/All Mail' ;
        return ;
}

sub gmail2 {
        my $mysync = shift ;

        # Gmail at host2
        $mysync->{host2} ||= 'imap.gmail.com' ;
        $mysync->{ssl2} = ( defined $mysync->{ssl2} ) ? $mysync->{ssl2} : 1 ;
        $mysync->{maxbytespersecond} ||= 20_000 ;           # should be 10_000 computed from by Gmail documentation
        $mysync->{maxbytesafter}     ||= 1_000_000_000 ;    # In fact it is documented as half: 500_000_000
        $maxsize                     ||= 25_000_000 ;
        $mysync->{automap}   = ( defined $mysync->{automap} )   ? $mysync->{automap}   : 1 ;
        $skipcrossduplicates = ( defined $skipcrossduplicates ) ? $skipcrossduplicates : 1 ;
        $expunge1            = ( defined $expunge1 )            ? $expunge1            : 1 ;
        $mysync->{addheader} = ( defined $mysync->{addheader} ) ? $mysync->{addheader} : 1 ;
        $mysync->{maxsleep}  = $MAX_SLEEP ;

        push @exclude,     '\[Gmail\]$' ;
        push @useheader,   'X-Gmail-Received', 'Message-Id' ;
        push @regextrans2, 's,\[Gmail\].,,' ;
        push @regextrans2, 's/[ ]+/_/g' ;
        push @regextrans2, q{s/['\\^"]/_/g} ;                   # Verified this
        push @folderlast,  "[Gmail]/All Mail" ;
        return ;
}

# From https://imapsync.lamiral.info/FAQ.d/FAQ.Exchange.txt
sub office1 {

        # Office 365 at host1
        my $mysync = shift ;

        $debug and myprint( "office1 configuration\n" ) ;
        $mysync->{host1} ||= 'outlook.office365.com' ;
        $mysync->{ssl1} = ( defined $mysync->{ssl1} ) ? $mysync->{ssl1} : 1 ;
        return ;
}

sub office2 {

        # Office 365 at host1
        my $mysync = shift ;
        $mysync->{host2} ||= 'outlook.office365.com' ;
        $mysync->{ssl2} = ( defined $mysync->{ssl2} ) ? $mysync->{ssl2} : 1 ;
        $maxsize ||= 45_000_000 ;
        $mysync->{maxmessagespersecond} ||= 4 ;
        push @regexflag, 's/\\Flagged//g' ;
        $disarmreadreceipts = ( defined $disarmreadreceipts ) ? $disarmreadreceipts : 1 ;
        push @regexmess, 's,(.{10500}),$1\r\n,g' ;
        return ;
}

sub exchange1 {

        # Exchange 2010/2013 at host1

        # Well nothing to do so far
        return ;
}

sub exchange2 {

        # Exchange 2010/2013 at host2
        my $mysync = shift ;
        $maxsize ||= 10_000_000 ;
        $mysync->{maxmessagespersecond} ||= 4 ;
        push @regexflag, 's/\\Flagged//g' ;
        $disarmreadreceipts = ( defined $disarmreadreceipts ) ? $disarmreadreceipts : 1 ;
        push @regexmess, 's,(.{10500}),$1\r\n,g' ;
        return ;
}

sub domino1 {

        # Domino at host1
        my $mysync = shift ;

        $sep1              = q{\\} ;
        $prefix1           = q{} ;
        $messageidnodomain = ( defined $messageidnodomain ) ? $messageidnodomain : 1 ;
        return ;
}

sub domino2 {

        # Domino at host1
        my $mysync = shift ;

        $sep2              = q{\\} ;
        $prefix2           = q{} ;
        $messageidnodomain = ( defined $messageidnodomain ) ? $messageidnodomain : 1 ;
        push @regextrans2, 's,^Inbox\\\\(.*),$1,i' ;
        return ;
}

sub tests_resolv {
        note( 'Entering tests_resolv()' ) ;

        # is( , resolv(  ), 'resolv:  => ' ) ;
        is( undef,           resolv(),                          'resolv: no args => undef' ) ;
        is( undef,           resolv( '' ),                      'resolv: empty string => undef' ) ;
        is( undef,           resolv( 'hostnotexist' ),          'resolv: hostnotexist => undef' ) ;
        is( '127.0.0.1',     resolv( '127.0.0.1' ),             'resolv: 127.0.0.1 => 127.0.0.1' ) ;
        is( '127.0.0.1',     resolv( 'localhost' ),             'resolv: localhost => 127.0.0.1' ) ;
        is( '5.135.158.182', resolv( 'imapsync.lamiral.info' ), 'resolv: imapsync.lamiral.info => 5.135.158.182' ) ;

        # ip6-localhost ( in /etc/hosts )
        is( '::1', resolv( 'ip6-localhost' ), 'resolv: ip6-localhost => ::1' ) ;
        is( '::1', resolv( '::1' ),           'resolv: ::1 => ::1' ) ;

        # ks2
        is( '2001:41d0:8:d8b6::1', resolv( '2001:41d0:8:d8b6::1' ),  'resolv:  2001:41d0:8:d8b6::1 => 2001:41d0:8:d8b6::1' ) ;
        is( '2001:41d0:8:d8b6::1', resolv( 'ks2ipv6.lamiral.info' ), 'resolv: ks2ipv6.lamiral.info => 2001:41d0:8:d8b6::1' ) ;

        # ks3
        is( '2001:41d0:8:bebd::1', resolv( '2001:41d0:8:bebd::1' ),  'resolv:  2001:41d0:8:bebd::1 => 2001:41d0:8:bebd::1' ) ;
        is( '2001:41d0:8:bebd::1', resolv( 'ks3ipv6.lamiral.info' ), 'resolv: ks3ipv6.lamiral.info => 2001:41d0:8:bebd::1' ) ;

        note( 'Leaving  tests_resolv()' ) ;
        return ;
}

sub resolv {
        my $host = shift @ARG ;

        if ( !$host ) { return ; }
        my $addr ;
        if ( defined &Socket::getaddrinfo ) {
                $addr = resolv_with_getaddrinfo( $host ) ;
                return ( $addr ) ;
        }

        my $iaddr = inet_aton( $host ) ;
        if ( !$iaddr ) { return ; }
        $addr = inet_ntoa( $iaddr ) ;

        return $addr ;
}

sub resolv_with_getaddrinfo {
        my $host = shift @ARG ;

        if ( !$host ) { return ; }

        my ( $err, @res ) = Socket::getaddrinfo( $host, "", { socktype => Socket::SOCK_RAW } ) ;
        if ( $err ) {
                myprint( "Cannot getaddrinfo of $host: $err\n" ) ;
                return ;
        }

        my @addr ;
        while ( my $ai = shift @res ) {
                my ( $err, $ipaddr ) = Socket::getnameinfo( $ai->{addr}, Socket::NI_NUMERICHOST(), Socket::NIx_NOSERV() ) ;
                if ( $err ) {
                        myprint( "Cannot getnameinfo of $host: $err\n" ) ;
                        return ;
                }
                $debug and myprint( "$host => $ipaddr\n" ) ;
                push @addr, $ipaddr ;

                my ( $err_r, $reverse ) = Socket::getnameinfo( $ai->{addr}, 0, Socket::NIx_NOSERV() ) ;
                $debug and myprint( "$host => $ipaddr => $reverse\n" ) ;
        }

        return $addr[0] ;
}

sub tests_resolvrev {
        note( 'Entering tests_resolvrev()' ) ;

        # is( , resolvrev(  ), 'resolvrev:  => ' ) ;
        is( undef,             resolvrev(),                          'resolvrev: no args => undef' ) ;
        is( undef,             resolvrev( '' ),                      'resolvrev: empty string => undef' ) ;
        is( undef,             resolvrev( 'hostnotexist' ),          'resolvrev: hostnotexist => undef' ) ;
        is( 'localhost',       resolvrev( '127.0.0.1' ),             'resolvrev: 127.0.0.1 => localhost' ) ;
        is( 'localhost',       resolvrev( 'localhost' ),             'resolvrev: localhost => localhost' ) ;
        is( 'ks.lamiral.info', resolvrev( 'imapsync.lamiral.info' ), 'resolvrev: imapsync.lamiral.info => ks.lamiral.info' ) ;

        # ip6-localhost ( in /etc/hosts )
        is( 'ip6-localhost', resolvrev( 'ip6-localhost' ), 'resolvrev: ip6-localhost => ip6-localhost' ) ;
        is( 'ip6-localhost', resolvrev( '::1' ),           'resolvrev: ::1 => ip6-localhost' ) ;

        # ks2
        is( 'ks2ipv6.lamiral.info', resolvrev( '2001:41d0:8:d8b6::1' ),  'resolvrev:  2001:41d0:8:d8b6::1 => ks2ipv6.lamiral.info' ) ;
        is( 'ks2ipv6.lamiral.info', resolvrev( 'ks2ipv6.lamiral.info' ), 'resolvrev: ks2ipv6.lamiral.info => ks2ipv6.lamiral.info' ) ;

        # ks3
        is( 'ks3ipv6.lamiral.info', resolvrev( '2001:41d0:8:bebd::1' ),  'resolvrev:  2001:41d0:8:bebd::1 => ks3ipv6.lamiral.info' ) ;
        is( 'ks3ipv6.lamiral.info', resolvrev( 'ks3ipv6.lamiral.info' ), 'resolvrev: ks3ipv6.lamiral.info => ks3ipv6.lamiral.info' ) ;

        note( 'Leaving  tests_resolvrev()' ) ;
        return ;
}

sub resolvrev {
        my $host = shift @ARG ;

        if ( !$host ) { return ; }

        if ( defined &Socket::getaddrinfo ) {
                my $name = resolvrev_with_getaddrinfo( $host ) ;
                return ( $name ) ;
        }

        return ;
}

sub resolvrev_with_getaddrinfo {
        my $host = shift @ARG ;

        if ( !$host ) { return ; }

        my ( $err, @res ) = Socket::getaddrinfo( $host, "", { socktype => Socket::SOCK_RAW } ) ;
        if ( $err ) {
                myprint( "Cannot getaddrinfo of $host: $err\n" ) ;
                return ;
        }

        my @name ;
        while ( my $ai = shift @res ) {
                my ( $err, $reverse ) = Socket::getnameinfo( $ai->{addr}, 0, Socket::NIx_NOSERV() ) ;
                if ( $err ) {
                        myprint( "Cannot getnameinfo of $host: $err\n" ) ;
                        return ;
                }
                $debug and myprint( "$host => $reverse\n" ) ;
                push @name, $reverse ;
        }

        return $name[0] ;
}

sub tests_imapsping {
        note( 'Entering tests_imapsping()' ) ;

        is( undef, imapsping(),                          'imapsping: no args => undef' ) ;
        is( undef, imapsping( 'hostnotexist' ),          'imapsping: hostnotexist => undef' ) ;
        is( 1,     imapsping( 'imapsync.lamiral.info' ), 'imapsping: imapsync.lamiral.info => 1' ) ;
        is( 1,     imapsping( 'ks2ipv6.lamiral.info' ),  'imapsping: ks2ipv6.lamiral.info => 1' ) ;
        note( 'Leaving  tests_imapsping()' ) ;
        return ;
}

sub imapsping {
        my $host = shift ;
        return tcpping( $host, $IMAP_SSL_PORT ) ;
}

sub tests_tcpping {
        note( 'Entering tests_tcpping()' ) ;

        is( undef, tcpping(), 'tcpping: no args => undef' ) ;
        is( undef, tcpping( 'hostnotexist' ), 'tcpping: one arg => undef' ) ;
        is( undef, tcpping( undef,                   888 ), 'tcpping: arg undef, port => undef' ) ;
        is( undef, tcpping( 'hostnotexist',          993 ), 'tcpping: hostnotexist 993 => undef' ) ;
        is( undef, tcpping( 'hostnotexist',          888 ), 'tcpping: hostnotexist 888 => undef' ) ;
        is( 1,     tcpping( 'imapsync.lamiral.info', 993 ), 'tcpping: imapsync.lamiral.info 993 => 1' ) ;
        is( 0,     tcpping( 'imapsync.lamiral.info', 888 ), 'tcpping: imapsync.lamiral.info 888 => 0' ) ;
        is( 1,     tcpping( '5.135.158.182',         993 ), 'tcpping: 5.135.158.182 993 => 1' ) ;
        is( 0,     tcpping( '5.135.158.182',         888 ), 'tcpping: 5.135.158.182 888 => 0' ) ;

        # Net::Ping supports ipv6 only after release 1.50
        # http://cpansearch.perl.org/src/RURBAN/Net-Ping-2.59/Changes
        # Anyway I plan to avoid Net-Ping for that too long standing feature
        # Net-Ping is integrated in Perl itself, who knows ipv6 for a long time
        is( 1, tcpping( '2001:41d0:8:d8b6::1', 993 ), 'tcpping: 2001:41d0:8:d8b6::1 993 => 1' ) ;
        is( 0, tcpping( '2001:41d0:8:d8b6::1', 888 ), 'tcpping: 2001:41d0:8:d8b6::1 888 => 0' ) ;

        note( 'Leaving  tests_tcpping()' ) ;
        return ;
}

sub tcpping {
        if ( 2 != scalar( @ARG ) ) {
                return ;
        }
        my ( $host, $port ) = @ARG ;
        if ( !$host ) { return ; }
        if ( !$port ) { return ; }

        my $mytimeout = $TCP_PING_TIMEOUT ;
        require Net::Ping ;

        #my $p = Net::Ping->new( 'tcp' ) ;
        my $p = Net::Ping->new() ;
        $p->{port_num} = $port ;
        $p->service_check( 1 ) ;
        $p->hires( 1 ) ;
        my ( $ping_ok, $rtt, $ip ) = $p->ping( $host, $mytimeout ) ;
        if ( !defined $ping_ok ) { return ; }
        my $rtt_approx = sprintf( "%.3f", $rtt ) ;
        $debug and myprint( "Host $host timeout $mytimeout port $port ok $ping_ok ip $ip acked in $rtt_approx s\n" ) ;
        $p->close() ;

        if ( $ping_ok ) {
                return 1 ;
        }
        else {
                return 0 ;
        }
}

sub tests_sslcheck {
        note( 'Entering tests_sslcheck()' ) ;

        my $mysync ;

        is( undef, sslcheck( $mysync ), 'sslcheck: no sslcheck => undef' ) ;

        $mysync = { sslcheck => 1, } ;

        is( 0, sslcheck( $mysync ), 'sslcheck: no host => 0' ) ;

        $mysync = {
                sslcheck => 1,
                host1    => 'imapsync.lamiral.info',
                tls1     => 1,
        } ;

        is( 0, sslcheck( $mysync ), 'sslcheck: tls1 => 0' ) ;

        $mysync = {
                sslcheck => 1,
                host1    => 'imapsync.lamiral.info',
        } ;

        is( 1, sslcheck( $mysync ), 'sslcheck: imapsync.lamiral.info => 1' ) ;
        is( 1, $mysync->{ssl1},     'sslcheck: imapsync.lamiral.info => ssl1 1' ) ;

        $mysync->{sslcheck} = 0 ;
        is( undef, sslcheck( $mysync ), 'sslcheck: sslcheck off => undef' ) ;

        $mysync = {
                sslcheck => 1,
                host1    => 'imapsync.lamiral.info',
                host2    => 'test2.lamiral.info',
        } ;

        is( 2, sslcheck( $mysync ), 'sslcheck: imapsync.lamiral.info + test2.lamiral.info => 2' ) ;

        $mysync = {
                sslcheck => 1,
                host1    => 'imapsync.lamiral.info',
                host2    => 'test2.lamiral.info',
                tls1     => 1,
        } ;

        is( 1, sslcheck( $mysync ), 'sslcheck: imapsync.lamiral.info + test2.lamiral.info + tls1 => 1' ) ;

        note( 'Leaving  tests_sslcheck()' ) ;
        return ;
}

sub sslcheck {
        my $mysync = shift ;

        if ( !$mysync->{sslcheck} ) {
                return ;
        }
        my $nb_on = 0 ;
        $debug and myprint( "sslcheck\n" ) ;
        if (        ( !defined $mysync->{port1} )
                and ( !defined $mysync->{tls1} )
                and ( !defined $mysync->{ssl1} )
                and ( defined $mysync->{host1} ) )
        {
                myprint( "Host1: probing ssl on port $IMAP_SSL_PORT ( use --nosslcheck to avoid this ssl probe ) \n" ) ;
                if ( probe_imapssl( $mysync->{host1} ) ) {
                        $mysync->{ssl1} = 1 ;
                        myprint( "Host1: sslcheck detected open ssl port $IMAP_SSL_PORT so turning ssl on (use --nossl1 --notls1 to turn off SSL and TLS wizardry)\n" ) ;
                        $nb_on++ ;
                }
                else {
                        myprint( "Host1: sslcheck did not detected open ssl port $IMAP_SSL_PORT. Will use standard $IMAP_PORT port.\n" ) ;
                }
        }

        if (        ( !defined $mysync->{port2} )
                and ( !defined $mysync->{tls2} )
                and ( !defined $mysync->{ssl2} )
                and ( defined $mysync->{host2} ) )
        {
                myprint( "Host2: probing ssl on port $IMAP_SSL_PORT ( use --nosslcheck to avoid this ssl probe ) \n" ) ;
                if ( probe_imapssl( $mysync->{host2} ) ) {
                        $mysync->{ssl2} = 1 ;
                        myprint( "Host2: sslcheck detected open ssl port $IMAP_SSL_PORT so turning ssl on (use --nossl2 --notls2 to turn off SSL and TLS wizardry)\n" ) ;
                        $nb_on++ ;
                }
                else {
                        myprint( "Host2: sslcheck did not detected open ssl port $IMAP_SSL_PORT. Will use standard $IMAP_PORT port.\n" ) ;
                }
        }
        return $nb_on ;
}

sub testslive {
        my $mysync = shift ;
        $mysync->{host1}     = 'test1.lamiral.info' ;
        $mysync->{user1}     = 'test1' ;
        $mysync->{password1} = 'secret1' ;
        $mysync->{host2}     = 'test2.lamiral.info' ;
        $mysync->{user2}     = 'test2' ;
        $mysync->{password2} = 'secret2' ;
        return ;
}

sub testslive6 {
        my $mysync = shift ;
        $mysync->{host1}     = 'ks2ipv6.lamiral.info' ;
        $mysync->{user1}     = 'test1' ;
        $mysync->{password1} = 'secret1' ;
        $mysync->{host2}     = 'ks2ipv6.lamiral.info' ;
        $mysync->{user2}     = 'test2' ;
        $mysync->{password2} = 'secret2' ;
        return ;
}

sub tests_backslash_caret {
        note( 'Entering tests_backslash_caret()' ) ;

        is( "lalala",               backslash_caret( "lalala" ),                 'backslash_caret: lalala => lalala' ) ;
        is( "lalala\n",             backslash_caret( "lalala\n" ),               'backslash_caret: lalala => lalala 2nd' ) ;
        is( '^',                    backslash_caret( '\\' ),                     'backslash_caret: \\ => ^' ) ;
        is( "^\n",                  backslash_caret( "\\\n" ),                   'backslash_caret: \\ => ^' ) ;
        is( "\\lalala",             backslash_caret( "\\lalala" ),               'backslash_caret: \\lalala => \\lalala' ) ;
        is( "\\lal\\ala",           backslash_caret( "\\lal\\ala" ),             'backslash_caret: \\lal\\ala => \\lal\\ala' ) ;
        is( "\\lalala\n",           backslash_caret( "\\lalala\n" ),             'backslash_caret: \\lalala => \\lalala 2nd' ) ;
        is( "lalala^\n",            backslash_caret( "lalala\\\n" ),             'backslash_caret: lalala\\\n => lalala^\n' ) ;
        is( "lalala^\nlalala^\n",   backslash_caret( "lalala\\\nlalala\\\n" ),   'backslash_caret: lalala\\\nlalala\\\n => lalala^\nlalala^\n' ) ;
        is( "lal\\ala^\nlalala^\n", backslash_caret( "lal\\ala\\\nlalala\\\n" ), 'backslash_caret: lal\\ala\\\nlalala\\\n => lal\\ala^\nlalala^\n' ) ;

        note( 'Leaving  tests_backslash_caret()' ) ;
        return ;
}

sub backslash_caret {
        my $string = shift ;

        $string =~ s{\\ $ }{^}gxms ;

        return $string ;
}

sub tests_split_around_equal {
        note( 'Entering tests_split_around_equal()' ) ;
        is( undef, split_around_equal(), 'split_around_equal: no args => undef' ) ;
        is_deeply( { toto => 'titi' }, { split_around_equal( 'toto=titi' ) }, 'split_around_equal: toto=titi => toto => titi' ) ;
        is_deeply( { A => 'B', C => 'D' }, { split_around_equal( 'A=B=C=D' ) }, 'split_around_equal: toto=titi => toto => titi' ) ;
        is_deeply( { A => 'B', C => 'D' }, { split_around_equal( 'A=B', 'C=D' ) }, 'split_around_equal: A=B C=D => A => B, C=>D' ) ;

        note( 'Leaving  tests_split_around_equal()' ) ;
        return ;
}

sub split_around_equal {
        if ( !@ARG ) { return ; }
        return map { split /=/mxs, $_ } @ARG ;

}

sub tests_sig_install {
        note( 'Entering tests_sig_install()' ) ;
        my $mysync ;
        is( undef, sig_install(),          'sig_install: no args => undef' ) ;
        is( undef, sig_install( $mysync ), 'sig_install: arg undef => undef' ) ;
        $mysync = {} ;
        is( undef, sig_install( $mysync ), 'sig_install: empty hash => undef' ) ;

        # Default to ignore USR1 USR2 in case future install fails
        local $SIG{USR1} = local $SIG{USR2} = sub { } ;
        kill( 'USR1', $PROCESS_ID ) ;

        # Assign USR1 to call sub tototo
        # Surely a better value than undef should be returned when doing real signal stuff
        is( undef, sig_install( $mysync, \&tototo, 'USR1' ), 'sig_install: USR1 tototo' ) ;

        is( 1, kill( 'USR1', $PROCESS_ID ), 'sig_install: kill USR1 myself 1' ) ;
        is( 1, $mysync->{tototo_calls}, 'sig_install: tototo call nb 1' ) ;

        # Assign USR2 to call sub tototo
        is( undef, sig_install( $mysync, \&tototo, 'USR2' ), 'sig_install: USR2 tototo' ) ;

        is( 1, kill( 'USR2', $PROCESS_ID ), 'sig_install: kill USR2 myself 1' ) ;
        is( 2, $mysync->{tototo_calls}, 'sig_install: tototo call nb 2' ) ;

        is( 1, kill( 'USR1', $PROCESS_ID ), 'sig_install: kill USR1 myself 2' ) ;
        is( 3, $mysync->{tototo_calls}, 'sig_install: tototo call nb 3' ) ;

        local $SIG{USR1} = local $SIG{USR2} = sub { } ;
        is( 1, kill( 'USR1', $PROCESS_ID ), 'sig_install: kill USR1 myself 3' ) ;
        is( 3, $mysync->{tototo_calls}, 'sig_install: tototo call still nb 3' ) ;

        # Assign USR1 + USR2 to call sub tototo
        is( undef, sig_install( $mysync, \&tototo, 'USR1', 'USR2' ), 'sig_install: USR1 USR2 tototo' ) ;
        is( 1, kill( 'USR1', $PROCESS_ID ), 'sig_install: kill USR1 myself 4' ) ;
        is( 4, $mysync->{tototo_calls}, 'sig_install: tototo call now nb 4' ) ;

        is( 1, kill( 'USR2', $PROCESS_ID ), 'sig_install: kill USR1 myself 2' ) ;
        is( 5, $mysync->{tototo_calls}, 'sig_install: tototo call now nb 5' ) ;

        note( 'Leaving  tests_sig_install()' ) ;
        return ;
}

sub sig_install {
        my $mysync = shift ;
        if ( !$mysync ) { return ; }
        my $mysub = shift ;
        if ( !$mysub ) { return ; }

        my @signals = @ARG ;

        $mysync->{debugsig} and myprint( "In sig_install with $mysync and $mysub\n" ) ;

        my $subexit = sub {
                my $signame = shift ;
                $mysync->{debugsig} and myprint( "In subexit with $signame and $mysync\n" ) ;
                &$mysub( $mysync, $signame ) ;
        } ;

        foreach my $signal ( @signals ) {
                $mysync->{debugsig} and myprint( "Installing signal $signal for $subexit\n" ) ;
                output( $mysync, "kill -$signal $PROCESS_ID # special behavior\n" ) ;
                $SIG{$signal} = $subexit ;
        }
        return ;
}

sub tototo {
        my $mysync = shift ;
        myprint( "In tototo with @ARG\n" ) ;
        $mysync->{tototo_calls} += 1 ;
        return ;
}

sub usage {
        my $mysync = shift ;

        if ( !defined $mysync ) { return ; }

        my $usage = q{} ;
        my $usage_from_pod ;
        my $usage_footer = usage_footer( $mysync ) ;

        # pod2usage writes on a filehandle only and I want a variable
        open my $fh_pod2usage, ">", \$usage_from_pod or do {
                warn $OS_ERROR ;
                return ;
        } ;

        pod2usage(
                -exitval   => 'NOEXIT',
                -noperldoc => 1,
                -verbose   => 99,
                -sections  => [qw(NAME VERSION USAGE OPTIONS)],
                -indent    => 1,
                -loose     => 1,
                -output    => $fh_pod2usage,
        ) ;
        close $fh_pod2usage ;

        if ( 'MSWin32' eq $OSNAME ) {
                $usage_from_pod = backslash_caret( $usage_from_pod ) ;
        }
        $usage = join( q{}, $usage_from_pod, $usage_footer ) ;

        return ( $usage ) ;
}

sub tests_usage {
        my $usage ;
        like( $usage = usage( $sync ), qr/Name:/, 'usage: contains Name:' ) ;
        myprint( $usage ) ;
        like( $usage, qr/Version:/, 'usage: contains Version:' ) ;
        like( $usage, qr/Usage:/,   'usage: contains Usage:' ) ;
        like( $usage, qr/imapsync/, 'usage: contains imapsync' ) ;

        is( undef, usage(), 'usage: no args => undef' ) ;
        return ;
}

sub usage_footer {
        my $mysync = shift ;

        my $footer = q{} ;

        my $localhost_info = localhost_info( $mysync ) ;
        my $rcs            = $mysync->{rcs} ;
        my $homepage       = homepage() ;

        my $imapsync_release = $STR_use_releasecheck ;

        if ( $mysync->{releasecheck} ) {
                $imapsync_release = check_last_release() ;
        }

        $footer = qq{$localhost_info
$rcs
$imapsync_release
$homepage
} ;
        return ( $footer ) ;
}

sub usage_complete {

        # Unused, I guess this function could be deleted
        my $usage = <<'EOF' ;
--skipheader   reg     : Don't take into account header keyword
                         matching  reg    ex: --skipheader 'X.*'

--skipsize             : Don't take message size into account to compare
                         messages on both sides. On by default.
                         Use --no-skipsize for using size comparaison.
--allowsizemismatch    : allow RFC822.SIZE != fetched msg size
                         consider also --skipsize to avoid duplicate messages
                         when running syncs more than one time per mailbox

--reconnectretry1  int : reconnect to host1 if connection is lost up to
                          int  times per imap command (default is 3)
--reconnectretry2  int : same as --reconnectretry1 but for host2
--split1      int      : split the requests in several parts on host1.
                          int  is the number of messages handled per request.
                         default is like --split1 500.
--split2      int      : same thing on host2.
--nofixInboxINBOX      : Don't fix Inbox INBOX mapping.
EOF
        return ( $usage ) ;
}

sub myGetOptions {

        # Started as a copy of Luke Ross Getopt::Long::CGI
        # https://metacpan.org/release/Getopt-Long-CGI
        # So this sub function is under the same license as Getopt-Long-CGI Luke Ross wants it,
        # which was Perl 5.6 or later licenses at the date of the copy.

        my $mysync        = shift @ARG ;
        my $arguments_ref = shift @ARG ;
        my %options       = @ARG ;

        my $mycgi = $mysync->{cgi} ;

        if ( not under_cgi_context() ) {

                # Not CGI - pass upstream for normal command line handling
                return Getopt::Long::GetOptionsFromArray( $arguments_ref, %options ) ;
        }

        # We must be in CGI context now
        if ( !defined( $mycgi ) ) { return ; }

        my $badthings = 0 ;
        foreach my $key ( sort keys %options ) {
                my $val = $options{$key} ;

                if ( $key !~ m/^([\w\d\|]+)([=:][isf])?([\+!\@\%])?$/mxs ) {
                        $badthings++ ;
                        next ;    # Unknown item
                }

                my $name = [ split '|', $1, 1 ]->[0] ;

                if ( ( $3 || q{} ) eq '+' ) {
                        ${$val} = $mycgi->param( $name ) ;    # "Incremental" integer
                }
                elsif ( $2 ) {
                        my @values = $mycgi->multi_param( $name ) ;
                        my $type   = $2 ;

                        #myprint( "type[$type]values[@values]\$3[", $3 || q{}, "]val[$val]ref(val)[", ref($val), "]\n" ) ;
                        if ( ( $3 || q{} ) eq '%' or ref( $val ) eq 'HASH' ) {
                                my %values = map { split /=/mxs, $_ } @values ;

                                if ( $type =~ m/i$/mxs ) {
                                        foreach my $k ( keys %values ) {
                                                $values{$k} = int $values{$k} ;
                                        }
                                }
                                elsif ( $type =~ m/f$/mxs ) {
                                        foreach my $k ( keys %values ) {
                                                $values{$k} = 0 + $values{$k} ;
                                        }
                                }
                                if ( 'REF' eq ref $val ) {
                                        %{ ${$val} } = %values ;
                                }
                                else {
                                        %{$val} = %values ;
                                }
                        }
                        else {
                                if ( $type =~ m/i$/mxs ) {
                                        @values = map { q{} ne $_ ? int $_ : undef } @values ;
                                }
                                elsif ( $type =~ m/f$/mxs ) {
                                        @values = map { 0 + $_ } @values ;
                                }
                                if ( ( $3 || q{} ) eq '@' ) {
                                        @{ ${$val} } = @values ;
                                }
                                elsif ( ref( $val ) eq 'ARRAY' ) {
                                        @{$val} = @values ;
                                }
                                else {
                                        ${$val} = $values[0] ;
                                }
                        }
                }
                else {
                        # Checkbox
                        # Considers only --name
                        # Should consider also --no-name and --noname
                        ${$val} = $mycgi->param( $name ) ? 1 : undef ;
                }
        }
        if ( $badthings ) {
                return ;    # undef or ()
        }
        else {
                return ( 1 ) ;
        }
}

my @blabla ;                # just used to check get_options_cgi() with an array

sub tests_get_options_cgi_context {
        note( 'Entering tests_get_options_cgi()' ) ;

        # Temporary, have to think harder about testing CGI context in command line --tests
        # API:
        # * input arguments: two ways, command line or CGI
        #    * the program arguments
        #    * QUERY_STRING env variable
        # * return
        #   * QUERY_STRING length

        # CGI context
        local $ENV{SERVER_SOFTWARE} = 'Votre serviteur' ;

        # Real full test
        # = 'host1=test1.lamiral.info&user1=test1&password1=secret1&host2=test2.lamiral.info&user2=test2&password2=secret2&debugenv=on'
        my $mysync ;
        is( undef, get_options( $mysync ), 'get_options cgi context: no CGI module => undef' ) ;

        require CGI ;
        CGI->import( qw( -no_debug ) ) ;

        is( undef, get_options( $mysync ), 'get_options cgi context: no CGI param => undef' ) ;

        # Testing boolean
        $mysync->{cgi} = CGI->new( 'version=on&debugenv=on' ) ;
        local $ENV{'QUERY_STRING'} = 'version=on&debugenv=on' ;
        is( 22, get_options( $mysync ), 'get_options cgi context: QUERY_STRING => 22' ) ;
        is( 1,  $mysync->{version},     'get_options cgi context: --version => 1' ) ;

        # debugenv is not allowed in cgi context
        is( undef, $mysync->{debugenv}, 'get_options cgi context: $mysync->{debugenv} => undef' ) ;

        # QUERY_STRING in this test is only for return value of get_options
        # Have to think harder, GET/POST context, is this return value a good thing?
        local $ENV{'QUERY_STRING'} = 'host1=test1.lamiral.info&user1=test1' ;
        $mysync->{cgi} = CGI->new( 'host1=test1.lamiral.info&user1=test1' ) ;
        is( 36,      get_options( $mysync, ), 'get_options cgi context: QUERY_STRING => 36' ) ;
        is( 'test1', $mysync->{user1},        'get_options cgi context: $mysync->{user1} => test1' ) ;

        #local $ENV{'QUERY_STRING'} = undef ;

        # Testing @
        $mysync->{cgi} = CGI->new( 'blabla=fd1' ) ;
        get_options( $mysync ) ;
        is_deeply( ['fd1'], [@blabla], 'get_options cgi context: @blabla => fd1' ) ;
        $mysync->{cgi} = CGI->new( 'blabla=fd1&blabla=fd2' ) ;
        get_options( $mysync ) ;
        is_deeply( [ 'fd1', 'fd2' ], [@blabla], 'get_options cgi context: @blabla => fd1, fd2' ) ;

        # Testing s@ as ref
        $mysync->{cgi} = CGI->new( 'folder=fd1' ) ;
        get_options( $mysync ) ;
        is_deeply( ['fd1'], $mysync->{folder}, 'get_options cgi context: $mysync->{folder} => fd1' ) ;
        $mysync->{cgi} = CGI->new( 'folder=fd1&folder=fd2' ) ;
        get_options( $mysync ) ;
        is_deeply( [ 'fd1', 'fd2' ], $mysync->{folder}, 'get_options cgi context: $mysync->{folder} => fd1, fd2' ) ;

        # Testing %
        $mysync->{cgi} = CGI->new( 'f1f2h=s1=d1&f1f2h=s2=d2&f1f2h=s3=d3' ) ;
        get_options( $mysync ) ;

        is_deeply( { 's1' => 'd1', 's2' => 'd2', 's3' => 'd3' }, $mysync->{f1f2h}, 'get_options cgi context: f1f2h => s1=d1 s2=d2 s3=d3' ) ;

        # Testing boolean ! with --noxxx, doesnot work
        $mysync->{cgi} = CGI->new( 'nodry=on' ) ;
        get_options( $mysync ) ;
        is( undef, $mysync->{dry}, 'get_options cgi context: --nodry => $mysync->{dry} => undef' ) ;

        $mysync->{cgi} = CGI->new( 'host1=example.com' ) ;
        get_options( $mysync ) ;
        is( 'example.com', $mysync->{host1}, 'get_options cgi context: --host1=example.com => $mysync->{host1} => example.com' ) ;

        #myprint( Data::Dumper->Dump( [ $mysync ] )  ) ;
        $mysync->{cgi} = CGI->new( 'simulong=' ) ;
        get_options( $mysync ) ;
        is( undef, $mysync->{simulong}, 'get_options cgi context: --simulong= => $mysync->{simulong} => undef' ) ;

        $mysync->{cgi} = CGI->new( 'simulong' ) ;
        get_options( $mysync ) ;
        is( undef, $mysync->{simulong}, 'get_options cgi context: --simulong => $mysync->{simulong} => undef' ) ;

        $mysync->{cgi} = CGI->new( 'simulong=4' ) ;
        get_options( $mysync ) ;
        is( 4,     $mysync->{simulong}, 'get_options cgi context: --simulong=4 => $mysync->{simulong} => 4' ) ;
        is( undef, $mysync->{folder},   'get_options cgi context: --simulong=4 => $mysync->{folder} => undef' ) ;

        #myprint( Data::Dumper->Dump( [ $mysync ] )  ) ;

        note( 'Leaving  tests_get_options_cgi_context()' ) ;
        return ;
}

sub get_options_cgi {

        # In CGI context arguments are not in @ARGV but in QUERY_STRING variable (with GET).
        my $mysync = shift @ARG ;
        $mysync->{cgi} || return ;
        my @arguments = @ARG ;

        # final 0 is used to print usage when no option is given
        my $numopt = length $ENV{'QUERY_STRING'} || 1 ;
        $mysync->{f1f2h} = {} ;
        my $opt_ret = myGetOptions(
                $mysync,
                \@arguments,
                'abort'         => \$mysync->{abort},
                'host1=s'       => \$mysync->{host1},
                'host2=s'       => \$mysync->{host2},
                'user1=s'       => \$mysync->{user1},
                'user2=s'       => \$mysync->{user2},
                'password1=s'   => \$mysync->{password1},
                'password2=s'   => \$mysync->{password2},
                'dry!'          => \$mysync->{dry},
                'version'       => \$mysync->{version},
                'ssl1!'         => \$mysync->{ssl1},
                'ssl2!'         => \$mysync->{ssl2},
                'tls1!'         => \$mysync->{tls1},
                'tls2!'         => \$mysync->{tls2},
                'justlogin!'    => \$mysync->{justlogin},
                'justconnect!'  => \$mysync->{justconnect},
                'addheader!'    => \$mysync->{addheader},
                'automap!'      => \$mysync->{automap},
                'justautomap!'  => \$mysync->{justautomap},
                'gmail1'        => \$mysync->{gmail1},
                'gmail2'        => \$mysync->{gmail2},
                'office1'       => \$mysync->{office1},
                'office2'       => \$mysync->{office2},
                'exchange1'     => \$mysync->{exchange1},
                'exchange2'     => \$mysync->{exchange2},
                'domino1'       => \$mysync->{domino1},
                'domino2'       => \$mysync->{domino2},
                'f1f2=s@'       => \$mysync->{f1f2},
                'f1f2h=s%'      => \$mysync->{f1f2h},
                'folder=s@'     => \$mysync->{folder},
                'blabla=s'      => \@blabla,
                'testslive!'    => \$mysync->{testslive},
                'testslive6!'   => \$mysync->{testslive6},
                'releasecheck!' => \$mysync->{releasecheck},
                'simulong=i'    => \$mysync->{simulong},

                #  blabla and f1f2h=s% could be removed but
                # tests_get_options_cgi() should be split before
                # with a sub tests_myGetOptions()
        ) ;

        $debug and output( $mysync, "get options: [$opt_ret][$numopt]\n" ) ;

        if ( !$opt_ret ) {
                return ;
        }
        return $numopt ;
}

sub get_options_cmd {
        my $mysync    = shift @ARG ;
        my @arguments = @ARG ;
        my $mycgi     = $mysync->{cgi} ;

        # final 0 is used to print usage when no option is given on command line
        my $numopt = scalar @arguments || 0 ;
        my $argv = join "\x00", @arguments ;

        if ( $argv =~ m/-delete\x002/x ) {
                output( $mysync, "May be you mean --delete2 instead of --delete 2\n" ) ;
                return ;
        }
        $mysync->{f1f2h} = {} ;
        my $opt_ret = myGetOptions(
                $mysync,
                \@arguments,
                'debug!'                          => \$debug,
                'debuglist!'                      => \$debuglist,
                'debugcontent!'                   => \$debugcontent,
                'debugsleep=f'                    => \$mysync->{debugsleep},
                'debugflags!'                     => \$debugflags,
                'debugimap!'                      => \$debugimap,
                'debugimap1!'                     => \$debugimap1,
                'debugimap2!'                     => \$debugimap2,
                'debugdev!'                       => \$debugdev,
                'debugmemory!'                    => \$mysync->{debugmemory},
                'debugfolders!'                   => \$mysync->{debugfolders},
                'debugssl=i'                      => \$mysync->{debugssl},
                'debugcgi!'                       => \$debugcgi,
                'debugenv'                        => \$mysync->{debugenv},
                'debugsig'                        => \$mysync->{debugsig},
                'simulong=i'                      => \$mysync->{simulong},
                'abort'                           => \$mysync->{abort},
                'host1=s'                         => \$mysync->{host1},
                'host2=s'                         => \$mysync->{host2},
                'port1=i'                         => \$mysync->{port1},
                'port2=i'                         => \$mysync->{port2},
                'inet4|ipv4'                      => \$mysync->{inet4},
                'inet6|ipv6'                      => \$mysync->{inet6},
                'user1=s'                         => \$mysync->{user1},
                'user2=s'                         => \$mysync->{user2},
                'gmail1'                          => \$mysync->{gmail1},
                'gmail2'                          => \$mysync->{gmail2},
                'office1'                         => \$mysync->{office1},
                'office2'                         => \$mysync->{office2},
                'exchange1'                       => \$mysync->{exchange1},
                'exchange2'                       => \$mysync->{exchange2},
                'domino1'                         => \$mysync->{domino1},
                'domino2'                         => \$mysync->{domino2},
                'domain1=s'                       => \$domain1,
                'domain2=s'                       => \$domain2,
                'password1=s'                     => \$mysync->{password1},
                'password2=s'                     => \$mysync->{password2},
                'passfile1=s'                     => \$passfile1,
                'passfile2=s'                     => \$passfile2,
                'authmd5!'                        => \$authmd5,
                'authmd51!'                       => \$authmd51,
                'authmd52!'                       => \$authmd52,
                'sep1=s'                          => \$sep1,
                'sep2=s'                          => \$sep2,
                'folder=s@'                       => \$mysync->{folder},
                'folderrec=s'                     => \@folderrec,
                'include=s'                       => \@include,
                'exclude=s'                       => \@exclude,
                'folderfirst=s'                   => \@folderfirst,
                'folderlast=s'                    => \@folderlast,
                'prefix1=s'                       => \$prefix1,
                'prefix2=s'                       => \$prefix2,
                'subfolder2=s'                    => \$subfolder2,
                'fixslash2!'                      => \$fixslash2,
                'fixInboxINBOX!'                  => \$fixInboxINBOX,
                'regextrans2=s'                   => \@regextrans2,
                'mixfolders!'                     => \$mixfolders,
                'skipemptyfolders!'               => \$skipemptyfolders,
                'regexmess=s'                     => \@regexmess,
                'skipmess=s'                      => \@skipmess,
                'pipemess=s'                      => \@pipemess,
                'pipemesscheck!'                  => \$pipemesscheck,
                'disarmreadreceipts!'             => \$disarmreadreceipts,
                'regexflag=s'                     => \@regexflag,
                'filterflags!'                    => \$filterflags,
                'flagscase!'                      => \$flagscase,
                'syncflagsaftercopy!'             => \$syncflagsaftercopy,
                'resyncflags!'                    => \$mysync->{resyncflags},
                'delete|delete1!'                 => \$delete1,
                'delete2!'                        => \$delete2,
                'delete2duplicates!'              => \$delete2duplicates,
                'delete2folders!'                 => \$delete2folders,
                'delete2foldersonly=s'            => \$delete2foldersonly,
                'delete2foldersbutnot=s'          => \$delete2foldersbutnot,
                'syncinternaldates!'              => \$syncinternaldates,
                'idatefromheader!'                => \$idatefromheader,
                'syncacls!'                       => \$syncacls,
                'maxsize=i'                       => \$maxsize,
                'minsize=i'                       => \$minsize,
                'maxage=i'                        => \$maxage,
                'minage=i'                        => \$minage,
                'search=s'                        => \$search,
                'search1=s'                       => \$search1,
                'search2=s'                       => \$search2,
                'foldersizes!'                    => \$foldersizes,
                'foldersizesatend!'               => \$foldersizesatend,
                'dry!'                            => \$mysync->{dry},
                'expunge1|expunge!'               => \$expunge1,
                'expunge2!'                       => \$expunge2,
                'uidexpunge2!'                    => \$uidexpunge2,
                'subscribed!'                     => \$subscribed,
                'subscribe!'                      => \$subscribe,
                'subscribeall|subscribe_all!'     => \$subscribeall,
                'justbanner!'                     => \$justbanner,
                'justfolders!'                    => \$justfolders,
                'justfoldersizes!'                => \$justfoldersizes,
                'fast!'                           => \$fast,
                'version'                         => \$mysync->{version},
                'help'                            => \$help,
                'timeout=i'                       => \$timeout,
                'timeout1=i'                      => \$mysync->{h1}->{timeout},
                'timeout2=i'                      => \$mysync->{h2}->{timeout},
                'skipheader=s'                    => \$skipheader,
                'useheader=s'                     => \@useheader,
                'wholeheaderifneeded!'            => \$wholeheaderifneeded,
                'messageidnodomain!'              => \$messageidnodomain,
                'skipsize!'                       => \$skipsize,
                'allowsizemismatch!'              => \$allowsizemismatch,
                'fastio1!'                        => \$fastio1,
                'fastio2!'                        => \$fastio2,
                'sslcheck!'                       => \$mysync->{sslcheck},
                'ssl1!'                           => \$mysync->{ssl1},
                'ssl2!'                           => \$mysync->{ssl2},
                'ssl1_ssl_version=s'              => \$mysync->{h1}->{sslargs}->{SSL_version},
                'ssl2_ssl_version=s'              => \$mysync->{h2}->{sslargs}->{SSL_version},
                'sslargs1=s%'                     => \$mysync->{h1}->{sslargs},
                'sslargs2=s%'                     => \$mysync->{h2}->{sslargs},
                'tls1!'                           => \$mysync->{tls1},
                'tls2!'                           => \$mysync->{tls2},
                'uid1!'                           => \$uid1,
                'uid2!'                           => \$uid2,
                'authmech1=s'                     => \$authmech1,
                'authmech2=s'                     => \$authmech2,
                'authuser1=s'                     => \$authuser1,
                'authuser2=s'                     => \$authuser2,
                'proxyauth1'                      => \$proxyauth1,
                'proxyauth2'                      => \$proxyauth2,
                'split1=i'                        => \$split1,
                'split2=i'                        => \$split2,
                'buffersize=i'                    => \$buffersize,
                'reconnectretry1=i'               => \$reconnectretry1,
                'reconnectretry2=i'               => \$reconnectretry2,
                'tests!'                          => \$mysync->{tests},
                'testsdebug|tests_debug!'         => \$mysync->{testsdebug},
                'testsunit=s@'                    => \$mysync->{testsunit},
                'testslive!'                      => \$mysync->{testslive},
                'testslive6!'                     => \$mysync->{testslive6},
                'justlogin!'                      => \$mysync->{justlogin},
                'justconnect!'                    => \$mysync->{justconnect},
                'tmpdir=s'                        => \$tmpdir,
                'pidfile=s'                       => \$mysync->{pidfile},
                'pidfilelocking!'                 => \$mysync->{pidfilelocking},
                'sigexit=s@'                      => \$mysync->{sigexit},
                'sigreconnect=s@'                 => \$mysync->{sigreconnect},
                'sigignore=s@'                    => \$mysync->{sigignore},
                'releasecheck!'                   => \$mysync->{releasecheck},
                'modulesversion|modules_version!' => \$modulesversion,
                'usecache!'                       => \$usecache,
                'cacheaftercopy!'                 => \$cacheaftercopy,
                'debugcache!'                     => \$debugcache,
                'useuid!'                         => \$useuid,
                'addheader!'                      => \$mysync->{addheader},
                'exitwhenover=i'                  => \$exitwhenover,
                'checkselectable!'                => \$mysync->{checkselectable},
                'checkfoldersexist!'              => \$mysync->{checkfoldersexist},
                'checkmessageexists!'             => \$checkmessageexists,
                'expungeaftereach!'               => \$expungeaftereach,
                'abletosearch!'                   => \$mysync->{abletosearch},
                'abletosearch1!'                  => \$mysync->{abletosearch1},
                'abletosearch2!'                  => \$mysync->{abletosearch2},
                'showpasswords!'                  => \$mysync->{showpasswords},
                'maxlinelength=i'                 => \$maxlinelength,
                'maxlinelengthcmd=s'              => \$maxlinelengthcmd,
                'minmaxlinelength=i'              => \$minmaxlinelength,
                'debugmaxlinelength!'             => \$debugmaxlinelength,
                'fixcolonbug!'                    => \$fixcolonbug,
                'create_folder_old!'              => \$create_folder_old,
                'maxmessagespersecond=f'          => \$mysync->{maxmessagespersecond},
                'maxbytespersecond=i'             => \$mysync->{maxbytespersecond},
                'maxbytesafter=i'                 => \$mysync->{maxbytesafter},
                'maxsleep=f'                      => \$mysync->{maxsleep},
                'skipcrossduplicates!'            => \$skipcrossduplicates,
                'debugcrossduplicates!'           => \$debugcrossduplicates,
                'log!'                            => \$mysync->{log},
                'logfile=s'                       => \$mysync->{logfile},
                'logdir=s'                        => \$mysync->{logdir},
                'errorsmax=i'                     => \$mysync->{errorsmax},
                'errorsdump!'                     => \$mysync->{errorsdump},
                'fetch_hash_set=s'                => \$fetch_hash_set,
                'automap!'                        => \$mysync->{automap},
                'justautomap!'                    => \$mysync->{justautomap},
                'id!'                             => \$mysync->{id},
                'f1f2=s@'                         => \$mysync->{f1f2},
                'f1f2h=s%'                        => \$mysync->{f1f2h},
                'justfolderlists!'                => \$mysync->{justfolderlists},
                'delete1emptyfolders'             => \$mysync->{delete1emptyfolders},
        ) ;

        #myprint( Data::Dumper->Dump( [ $mysync ] )  ) ;
        $debug and output( $mysync, "get options: [$opt_ret][$numopt]\n" ) ;
        my $numopt_after = scalar @arguments ;

        #myprint( "get options: [$opt_ret][$numopt][$numopt_after]\n" ) ;
        if ( $numopt_after ) {
                myprint( "Extra arguments found: @arguments\n", "It usually means a quoting issue in the command line\n" ) ;
                return ;
        }
        if ( !$opt_ret ) {
                return ;
        }
        return $numopt ;
}

sub tests_get_options {
        note( 'Entering tests_get_options()' ) ;

        # CAVEAT: still setting global variables, be careful
        # with tests, the context increases! $debug stays on for example.
        # API:
        # * input arguments: two ways, command line or CGI
        #    * the program arguments
        #    * QUERY_STRING env variable
        # * return
        #   * undef if bad things happened like
        #     * options not known
        #     * --delete 2 input
        #   * number of arguments or QUERY_STRING length
        my $mysync3 = {} ;
        is( undef, get_options( $mysync3, qw( --noexist ) ), 'get_options: --noexist  => undef' ) ;
        is( undef, $mysync3->{noexist}, 'get_options: --noexist  => undef' ) ;
        $mysync3 = {} ;
        is( undef, get_options( $mysync3, qw( --lalala --noexist --version ) ), 'get_options: --lalala --noexist --version  => undef' ) ;
        is( 1,     $mysync3->{version}, 'get_options: --version => 1' ) ;
        is( undef, $mysync3->{noexist}, 'get_options: --noexist  => undef' ) ;
        $mysync3 = {} ;
        is( 1, get_options( $mysync3, qw( --delete2 ) ), 'get_options: --delete2 => 1' ) ;
        is( 1, $delete2, 'get_options: --delete2 => $delete2 = 1' ) ;
        $mysync3 = {} ;
        is( undef, get_options( $mysync3, qw( --delete 2 ) ), 'get_options: --delete 2 => undef' ) ;
        is( undef, $delete1, 'get_options: --delete 2 => $delete1 still undef ; good!' ) ;
        $mysync3 = {} ;
        is( undef, get_options( $mysync3, "--delete  2" ), 'get_options: --delete  2 => undef' ) ;

        is( 1, get_options( $mysync3, "--version" ), 'get_options: --version => 1' ) ;
        is( 1, get_options( $mysync3, "--help" ),    'get_options: --help => 1' ) ;

        is( undef, get_options( $mysync3, qw( --noexist --version ) ),     'get_options: --debug --noexist --version  => undef' ) ;
        is( 1,     get_options( $mysync3, qw( --version ) ),               'get_options: --version => 1' ) ;
        is( undef, get_options( $mysync3, qw( extra ) ),                   'get_options: extra => undef' ) ;
        is( undef, get_options( $mysync3, qw( extra1 --version extra2 ) ), 'get_options: extra1 --version extra2 => undef' ) ;

        $mysync3 = {} ;
        is( 2, get_options( $mysync3, qw( --host1 HOST_01) ), 'get_options: --host1 HOST_01 => 1' ) ;
        is( 'HOST_01', $mysync3->{host1}, 'get_options: --host1 HOST_01 => HOST_01' ) ;

        #myprint( Data::Dumper->Dump( [ $mysync3 ] )  ) ;

        note( 'Leaving  tests_get_options()' ) ;
        return ;
}

sub get_options {
        my $mysync    = shift @ARG ;
        my @arguments = @ARG ;

        #myprint( "1 mysync: ", Data::Dumper->Dump( [ $mysync ] )  ) ;
        my $ret ;
        if ( under_cgi_context() ) {

                # CGI context
                $ret = get_options_cgi( $mysync, @arguments ) ;
        }
        else {
                # Command line context ;
                $ret = get_options_cmd( $mysync, @arguments ) ;
        }

        #myprint( "2 mysync: ", Data::Dumper->Dump( [ $mysync ] )  ) ;
        foreach my $key ( sort keys %{$mysync} ) {
                if ( !defined $mysync->{$key} ) {
                        delete $mysync->{$key} ;
                        next ;
                }
                if ( 'ARRAY' eq ref( $mysync->{$key} )
                        and 0 == scalar( @{ $mysync->{$key} } ) )
                {
                        delete $mysync->{$key} ;
                }
        }
        return $ret ;
}

sub testunitsession {
        my $mysync = shift ;

        if ( !$mysync ) { return ; }
        if ( !$mysync->{testsunit} ) { return ; }

        my @functions = @{ $mysync->{testsunit} } ;

        if ( !@functions ) { return ; }

      SKIP: {
                if ( !@functions ) { skip 'No test in normal run' ; }
                testsunit( @functions ) ;
                done_testing() ;
        }
        return ;
}

sub tests_count_0s {
        note( 'Entering tests_count_zeros()' ) ;
        is( 0, count_0s(),    'count_0s: no parameters => 0' ) ;
        is( 1, count_0s( 0 ), 'count_0s: 0 => 1' ) ;
        is( 0, count_0s( 1 ), 'count_0s: 1 => 0' ) ;
        is( 1, count_0s( 1, 0, 1 ), 'count_0s: 1, 0, 1 => 1' ) ;
        is( 2, count_0s( 1, 0, 1, 0 ), 'count_0s: 1, 0, 1, 0 => 2' ) ;
        note( 'Leaving  tests_count_zeros()' ) ;
        return ;
}

sub count_0s {
        my @array = @ARG ;

        if ( !@array ) { return 0 ; }
        my $nb_zeros = 0 ;
        map { $_ == 0 and $nb_zeros += 1 } @array ;
        return $nb_zeros ;
}

sub tests_report_failures {
        note( 'Entering tests_report_failures()' ) ;
        is( undef, report_failures(), 'report_failures: no parameters => undef' ) ;
        is( "nb 1 - first\n", report_failures( ( { 'ok' => 0, name => 'first' } ) ), 'report_failures: "first" failed => nb 1 - first' ) ;
        is( q{},              report_failures( ( { 'ok' => 1, name => 'first' } ) ), 'report_failures: "first" success =>' ) ;
        is( "nb 2 - second\n",               report_failures( ( { 'ok' => 1, name => 'second' }, { 'ok' => 0, name => 'second' } ) ), 'report_failures: "second" failed => nb 2 - second' ) ;
        is( "nb 1 - first\nnb 2 - second\n", report_failures( ( { 'ok' => 0, name => 'first' },  { 'ok' => 0, name => 'second' } ) ), 'report_failures: both failed => nb 1 - first nb 2 - second' ) ;
        note( 'Leaving  tests_report_failures()' ) ;
        return ;
}

sub report_failures {
        my @details = @ARG ;

        if ( !@details ) { return ; }

        my $counter = 1 ;
        my $report  = q{} ;
        foreach my $details ( @details ) {
                if ( !$details->{'ok'} ) {
                        my $name = $details->{'name'} || 'NONAME' ;
                        $report .= "nb $counter - $name\n" ;
                }
                $counter += 1 ;
        }
        return $report ;

}

sub tests_true {
        note( 'Entering tests_true()' ) ;
        is( 1, 1, 'true: 1 is 1' ) ;
        note( 'Leaving  tests_true()' ) ;
        return ;
}

sub tests_testsunit {
        note( 'Entering tests_testunit()' ) ;
        is( undef, testsunit(),                'testsunit: no parameters => undef' ) ;
        is( undef, testsunit( undef ),         'testsunit: an undef parameter => undef' ) ;
        is( undef, testsunit( q{} ),           'testsunit: an empty parameter => undef' ) ;
        is( undef, testsunit( 'idonotexist' ), 'testsunit: a do not exist function as parameter => undef' ) ;
        is( undef, testsunit( 'tests_true' ),  'testsunit: tests_true => undef' ) ;
        note( 'Leaving  tests_testunit()' ) ;
        return ;
}

sub testsunit {
        my @functions = @ARG ;

        if ( !@functions ) {    #
                myprint( "testsunit warning: no argument given\n" ) ;
                return ;
        }

        foreach my $function ( @functions ) {
                if ( !$function ) {
                        myprint( "testsunit warning: argument is empty\n" ) ;
                        next ;
                }
                if ( !exists &$function ) {
                        myprint( "testsunit warning: function $function does not exist\n" ) ;
                        next ;
                }
                if ( !defined &$function ) {
                        myprint( "testsunit warning: function $function is not defined\n" ) ;
                        next ;
                }
                my $function_ref = \&{$function} ;
                &$function_ref() ;
        }
        return ;
}

sub testsdebug {
        my $mysync = shift ;
        if ( !$mysync->{testsdebug} ) { return ; }
      SKIP: {
                if ( !$mysync->{testsdebug} ) {
                        skip 'No test in normal run' ;
                }

                note( 'Entering testsdebug()' ) ;
                ok( ( ( not -d 'W/tmp/tests' ) or rmtree( 'W/tmp/tests/' ) ), 'testsdebug: rmtree W/tmp/tests' ) ;

                #tests_bytes_display_string(  ) ;
                #tests_ucsecond(  ) ;
                #tests_mkpath(  ) ;
                #tests_format_for_imap_arg(  ) ;
                #tests_is_a_release_number(  ) ;
                #tests_delete1emptyfolders(  ) ;
                #tests_memory_consumption(  ) ;
                #tests_imap2_folder_name() ;
                #tests_length_ref(  ) ;
                #tests_diff_or_NA(  ) ;
                #tests_match_number(  ) ;
                #tests_all_defined(  ) ;
                #tests_guess_separator(  ) ;
                #tests_message_for_host2(  ) ;
                #tests_special_from_folders_hash(  ) ;
                #tests_do_valid_directory(  ) ;
                #tests_notmatch(  ) ;
                #tests_match(  ) ;
                #tests_get_options(  ) ;
                #tests_rand32(  ) ;
                #tests_string_to_file(  ) ;
                #tests_hashsynclocal(  ) ;
                #tests_output(  ) ;
                #tests_output_reset_with(  ) ;
                #tests_output_start(  ) ;
                #tests_hashsync(  ) ;
                #tests_check_last_release(  ) ;
                #tests_cpu_number(  ) ;
                #tests_load_and_delay(  ) ;
                #tests_loadavg(  ) ;
                #tests_backtick(  ) ;
                #tests_firstline(  ) ;
                #tests_pipemess(  ) ;
                #tests_not_long_imapsync_version_public(  ) ;
                #tests_get_options_cgi(  ) ;
                #tests_guess_special(  ) ;
                ####tests_reconnect_if_needed(  ) ;
                #tests_reconnect_12_if_needed(  ) ;
                #tests_sleep_max_bytes(  ) ;
                #tests_file_to_string(  ) ;
                #tests_under_cgi_context(  ) ;
                #tests_umask(  ) ;
                #tests_umask_str(  ) ;
                #tests_set_umask(  ) ;
                #tests_createhashfileifneeded(  ) ;
                #tests_filter_forbidden_characters(  ) ;
                #tests_logfile(  ) ;
                #tests_setlogfile(  ) ;
                #tests_move_slash(  ) ;
                #tests_testsunit(  ) ;
                #tests_always_fail(  ) ;
                #tests_count_0s(  ) ;
                #tests_report_failures(  ) ;
                #tests_max(  ) ;
                #tests_min(  ) ;
                #tests_sleep_if_needed(  ) ;
                #tests_imapsping(  ) ;
                #tests_tcpping(  ) ;
                #tests_sslcheck(  ) ;
                #tests_resolv(  ) ;
                #tests_resolvrev(  ) ;
                #tests_connect_socket(  ) ;
                #tests_probe_imapssl(  ) ;
                #tests_mailimapclient_connect(  ) ;
                #tests_guess_prefix(  ) ;
                #tests_usage(  ) ;
                #tests_version_from_rcs(  ) ;
                #tests_mailimapclient_connect_bug(  ) ; # it fails with Mail-IMAPClient <= 3.39
                #tests_backslash_caret(  ) ;
                tests_write_pidfile() ;
                tests_remove_pidfile_not_running() ;
                tests_match_a_pid_number() ;
                note( 'Leaving  testsdebug()' ) ;
                done_testing() ;
        }
        return ;
}

sub tests_template {
        note( 'Entering tests_template()' ) ;
        is( undef, undef, 'template: undef is undef' ) ;
        is_deeply( {}, {}, 'template: a hash is a hash' ) ;
        is_deeply( [], [], 'template: an array is an array' ) ;
        note( 'Leaving  tests_template()' ) ;
        return ;
}

sub tests {
        my $mysync = shift ;
        if ( !$mysync->{tests} ) { return ; }

      SKIP: {
                skip 'No test in normal run' if ( !$mysync->{tests} ) ;
                note( 'Entering tests()' ) ;
                tests_folder_routines() ;
                tests_compare_lists() ;
                tests_regexmess() ;
                tests_skipmess() ;
                tests_flags_regex() ;
                tests_ucsecond() ;
                tests_permanentflags() ;
                tests_flags_filter() ;
                tests_separator_invert() ;
                tests_imap2_folder_name() ;
                tests_command_line_nopassword() ;
                tests_good_date() ;
                tests_max() ;
                tests_remove_not_num() ;
                tests_memory_consumption() ;
                tests_is_a_release_number() ;
                tests_imapsync_basename() ;
                tests_list_keys_in_2_not_in_1() ;
                tests_convert_sep_to_slash() ;
                tests_match_a_cache_file() ;
                tests_cache_map() ;
                tests_get_cache() ;
                tests_clean_cache() ;
                tests_clean_cache_2() ;
                tests_touch() ;
                tests_flagscase() ;
                tests_mkpath() ;
                tests_extract_header() ;
                tests_decompose_header() ;
                tests_epoch() ;
                tests_add_header() ;
                tests_cache_dir_fix() ;
                tests_cache_dir_fix_win() ;
                tests_filter_forbidden_characters() ;
                tests_cache_folder() ;
                tests_time_remaining() ;
                tests_decompose_regex() ;
                tests_backtick() ;
                tests_bytes_display_string() ;
                tests_header_line_normalize() ;
                tests_fix_Inbox_INBOX_mapping() ;
                tests_max_line_length() ;
                tests_subject() ;
                tests_msgs_from_maxmin() ;
                tests_tmpdir_has_colon_bug() ;
                tests_sleep_max_messages() ;
                tests_sleep_max_bytes() ;
                tests_logfile() ;
                tests_setlogfile() ;
                tests_jux_utf8() ;
                tests_pipemess() ;
                tests_jux_utf8_list() ;
                tests_guess_prefix() ;
                tests_guess_separator() ;
                tests_format_for_imap_arg() ;
                tests_imapsync_id() ;
                tests_date_from_rcs() ;
                tests_quota_extract_storage_limit_in_bytes() ;
                tests_quota_extract_storage_current_in_bytes() ;
                tests_guess_special() ;
                tests_do_valid_directory() ;
                tests_delete1emptyfolders() ;
                tests_message_for_host2() ;
                tests_length_ref() ;
                tests_firstline() ;
                tests_diff_or_NA() ;
                tests_match_number() ;
                tests_all_defined() ;
                tests_special_from_folders_hash() ;
                tests_notmatch() ;
                tests_match() ;
                tests_get_options() ;
                tests_get_options_cgi_context() ;
                tests_rand32() ;
                tests_hashsynclocal() ;
                tests_hashsync() ;
                tests_output() ;
                tests_output_reset_with() ;
                tests_output_start() ;
                tests_check_last_release() ;
                tests_loadavg() ;
                tests_cpu_number() ;
                tests_load_and_delay() ;

                #tests_imapsping(  ) ;
                #tests_tcpping(  ) ;
                tests_sslcheck() ;
                tests_not_long_imapsync_version_public() ;
                tests_reconnect_if_needed() ;
                tests_reconnect_12_if_needed() ;
                tests_sleep_if_needed() ;
                tests_string_to_file() ;
                tests_file_to_string() ;
                tests_under_cgi_context() ;
                tests_umask() ;
                tests_umask_str() ;
                tests_set_umask() ;
                tests_createhashfileifneeded() ;
                tests_move_slash() ;
                tests_testsunit() ;
                tests_count_0s() ;
                tests_report_failures() ;
                tests_min() ;

                #tests_resolv(  ) ;
                #tests_resolvrev(  ) ;
                tests_connect_socket() ;
                tests_probe_imapssl() ;
                tests_mailimapclient_connect() ;
                tests_usage() ;
                tests_version_from_rcs() ;
                tests_backslash_caret() ;

                #tests_mailimapclient_connect_bug(  ) ; # it fails with Mail-IMAPClient <= 3.39
                tests_write_pidfile() ;
                tests_remove_pidfile_not_running() ;
                tests_match_a_pid_number() ;
                tests_prefix_seperator_invertion() ;
                tests_is_an_integer() ;
                tests_integer_or_1() ;
                tests_is_number() ;

                #tests_always_fail(  ) ;
                tests_sig_install() ;
                tests_template() ;
                tests_split_around_equal() ;
                done_testing( 1160 ) ;
                note( 'Leaving  tests()' ) ;
        }
        return ;
}