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[CommandLine] Don't print empty sentinel values from EnumValN lists in help text
In order to make an option value truly optional, both the ValueOptional attribute and an empty-named value are required. Prior to this change, this empty-named value appears in the command-line help text: -some-option - some help text =v1 - description 1 =v2 - description 2 = - This change improves the help text for these sort of options in a number of ways: 1) ValueOptional options with an empty-named value now print their help text twice: both without and then with '=<value>' after the name. The latter version then lists the allowed values after it. 2) Empty-named values with no help text in ValueOptional options are not listed in the permitted values. -some-option - some help text -some-option=<value> - some help text =v1 - description 1 =v2 - description 2 3) Otherwise empty-named options are printed as =<empty> rather than simply '='. 4) Option values without help text do not have the '-' separator printed. -some-option=<value> - some help text =v1 - description 1 =v2 =<empty> - description It also tweaks the llvm-symbolizer -functions help text to not print a trailing ':' as that looks bad combined with 1) above. This is mostly a reland of r353048 which in turn was a reland of r352750. Reviewed by: ruiu, thopre, mstorsjo Differential Revision: https://reviews.llvm.org/D57030 llvm-svn: 353053
This commit is contained in:
James Henderson
parent
08d6482cba
commit
5632da10d6
@ -1469,17 +1469,23 @@ static StringRef getValueStr(const Option &O, StringRef DefaultMsg) {
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return O.ValueStr;
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}
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static StringRef ArgPrefix = " -";
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static StringRef ArgHelpPrefix = " - ";
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static size_t ArgPrefixesSize = ArgPrefix.size() + ArgHelpPrefix.size();
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//===----------------------------------------------------------------------===//
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// cl::alias class implementation
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//
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// Return the width of the option tag for printing...
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size_t alias::getOptionWidth() const { return ArgStr.size() + 6; }
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size_t alias::getOptionWidth() const { return ArgStr.size() + ArgPrefixesSize; }
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void Option::printHelpStr(StringRef HelpStr, size_t Indent,
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size_t FirstLineIndentedBy) {
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size_t FirstLineIndentedBy) {
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assert(Indent >= FirstLineIndentedBy);
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std::pair<StringRef, StringRef> Split = HelpStr.split('\n');
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outs().indent(Indent - FirstLineIndentedBy) << " - " << Split.first << "\n";
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outs().indent(Indent - FirstLineIndentedBy)
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<< ArgHelpPrefix << Split.first << "\n";
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while (!Split.second.empty()) {
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Split = Split.second.split('\n');
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outs().indent(Indent) << Split.first << "\n";
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@ -1488,8 +1494,8 @@ void Option::printHelpStr(StringRef HelpStr, size_t Indent,
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// Print out the option for the alias.
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void alias::printOptionInfo(size_t GlobalWidth) const {
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outs() << " -" << ArgStr;
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printHelpStr(HelpStr, GlobalWidth, ArgStr.size() + 6);
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outs() << ArgPrefix << ArgStr;
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printHelpStr(HelpStr, GlobalWidth, ArgStr.size() + ArgPrefixesSize);
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}
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//===----------------------------------------------------------------------===//
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@ -1510,7 +1516,7 @@ size_t basic_parser_impl::getOptionWidth(const Option &O) const {
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Len += getValueStr(O, ValName).size() + FormattingLen;
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}
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return Len + 6;
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return Len + ArgPrefixesSize;
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}
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// printOptionInfo - Print out information about this option. The
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@ -1518,7 +1524,7 @@ size_t basic_parser_impl::getOptionWidth(const Option &O) const {
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//
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void basic_parser_impl::printOptionInfo(const Option &O,
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size_t GlobalWidth) const {
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outs() << " -" << O.ArgStr;
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outs() << ArgPrefix << O.ArgStr;
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auto ValName = getValueName();
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if (!ValName.empty()) {
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@ -1534,7 +1540,7 @@ void basic_parser_impl::printOptionInfo(const Option &O,
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void basic_parser_impl::printOptionName(const Option &O,
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size_t GlobalWidth) const {
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outs() << " -" << O.ArgStr;
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outs() << ArgPrefix << O.ArgStr;
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outs().indent(GlobalWidth - O.ArgStr.size());
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}
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@ -1642,12 +1648,28 @@ unsigned generic_parser_base::findOption(StringRef Name) {
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return e;
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}
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static StringRef EqValue = "=<value>";
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static StringRef EmptyOption = "<empty>";
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static StringRef OptionPrefix = " =";
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static size_t OptionPrefixesSize = OptionPrefix.size() + ArgHelpPrefix.size();
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static bool shouldPrintOption(StringRef Name, StringRef Description,
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const Option &O) {
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return O.getValueExpectedFlag() != ValueOptional || !Name.empty() ||
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!Description.empty();
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}
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// Return the width of the option tag for printing...
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size_t generic_parser_base::getOptionWidth(const Option &O) const {
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if (O.hasArgStr()) {
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size_t Size = O.ArgStr.size() + 6;
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for (unsigned i = 0, e = getNumOptions(); i != e; ++i)
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Size = std::max(Size, getOption(i).size() + 8);
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size_t Size = O.ArgStr.size() + ArgPrefixesSize + EqValue.size();
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for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
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StringRef Name = getOption(i);
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if (!shouldPrintOption(Name, getDescription(i), O))
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continue;
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size_t NameSize = Name.empty() ? EmptyOption.size() : Name.size();
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Size = std::max(Size, NameSize + OptionPrefixesSize);
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}
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return Size;
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} else {
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size_t BaseSize = 0;
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@ -1663,13 +1685,38 @@ size_t generic_parser_base::getOptionWidth(const Option &O) const {
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void generic_parser_base::printOptionInfo(const Option &O,
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size_t GlobalWidth) const {
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if (O.hasArgStr()) {
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outs() << " -" << O.ArgStr;
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Option::printHelpStr(O.HelpStr, GlobalWidth, O.ArgStr.size() + 6);
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// When the value is optional, first print a line just describing the
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// option without values.
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if (O.getValueExpectedFlag() == ValueOptional) {
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for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
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if (getOption(i).empty()) {
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outs() << ArgPrefix << O.ArgStr;
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Option::printHelpStr(O.HelpStr, GlobalWidth,
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O.ArgStr.size() + ArgPrefixesSize);
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break;
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}
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}
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}
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outs() << ArgPrefix << O.ArgStr << EqValue;
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Option::printHelpStr(O.HelpStr, GlobalWidth,
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O.ArgStr.size() + EqValue.size() + ArgPrefixesSize);
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for (unsigned i = 0, e = getNumOptions(); i != e; ++i) {
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size_t NumSpaces = GlobalWidth - getOption(i).size() - 8;
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outs() << " =" << getOption(i);
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outs().indent(NumSpaces) << " - " << getDescription(i) << '\n';
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StringRef OptionName = getOption(i);
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StringRef Description = getDescription(i);
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if (!shouldPrintOption(OptionName, Description, O))
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continue;
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assert(GlobalWidth >= OptionName.size() + OptionPrefixesSize);
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size_t NumSpaces = GlobalWidth - OptionName.size() - OptionPrefixesSize;
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outs() << OptionPrefix << OptionName;
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if (OptionName.empty()) {
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outs() << EmptyOption;
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assert(NumSpaces >= EmptyOption.size());
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NumSpaces -= EmptyOption.size();
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}
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if (!Description.empty())
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outs().indent(NumSpaces) << ArgHelpPrefix << " " << Description;
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outs() << '\n';
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}
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} else {
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if (!O.HelpStr.empty())
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@ -38,7 +38,7 @@ ClUseSymbolTable("use-symbol-table", cl::init(true),
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static cl::opt<FunctionNameKind> ClPrintFunctions(
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"functions", cl::init(FunctionNameKind::LinkageName),
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cl::desc("Print function name for a given address:"), cl::ValueOptional,
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cl::desc("Print function name for a given address"), cl::ValueOptional,
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cl::values(clEnumValN(FunctionNameKind::None, "none", "omit function name"),
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clEnumValN(FunctionNameKind::ShortName, "short",
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"print short function name"),
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@ -13,6 +13,7 @@
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#include "llvm/Config/config.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/InitLLVM.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Program.h"
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#include "llvm/Support/StringSaver.h"
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@ -839,4 +840,218 @@ TEST(CommandLineTest, GetCommandLineArguments) {
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}
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#endif
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class OutputRedirector {
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public:
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OutputRedirector(int RedirectFD)
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: RedirectFD(RedirectFD), OldFD(dup(RedirectFD)) {
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if (OldFD == -1 ||
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sys::fs::createTemporaryFile("unittest-redirect", "", NewFD,
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FilePath) ||
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dup2(NewFD, RedirectFD) == -1)
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Valid = false;
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}
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~OutputRedirector() {
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dup2(OldFD, RedirectFD);
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close(OldFD);
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close(NewFD);
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}
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SmallVector<char, 128> FilePath;
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bool Valid = true;
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private:
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int RedirectFD;
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int OldFD;
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int NewFD;
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};
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struct AutoDeleteFile {
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SmallVector<char, 128> FilePath;
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~AutoDeleteFile() {
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if (!FilePath.empty())
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sys::fs::remove(std::string(FilePath.data(), FilePath.size()));
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}
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};
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class PrintOptionInfoTest : public ::testing::Test {
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public:
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// Return std::string because the output of a failing EXPECT check is
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// unreadable for StringRef. It also avoids any lifetime issues.
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template <typename... Ts> std::string runTest(Ts... OptionAttributes) {
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AutoDeleteFile File;
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{
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OutputRedirector Stdout(fileno(stdout));
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if (!Stdout.Valid)
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return "";
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File.FilePath = Stdout.FilePath;
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StackOption<OptionValue> TestOption(Opt, cl::desc(HelpText),
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OptionAttributes...);
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printOptionInfo(TestOption, 25);
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outs().flush();
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}
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auto Buffer = MemoryBuffer::getFile(File.FilePath);
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if (!Buffer)
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return "";
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return Buffer->get()->getBuffer().str();
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}
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enum class OptionValue { Val };
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const StringRef Opt = "some-option";
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const StringRef HelpText = "some help";
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private:
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// This is a workaround for cl::Option sub-classes having their
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// printOptionInfo functions private.
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void printOptionInfo(const cl::Option &O, size_t Width) {
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O.printOptionInfo(Width);
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}
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};
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TEST_F(PrintOptionInfoTest, PrintOptionInfoValueOptionalWithoutSentinel) {
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std::string Output =
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runTest(cl::ValueOptional,
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cl::values(clEnumValN(OptionValue::Val, "v1", "desc1")));
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// clang-format off
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EXPECT_EQ(Output, (" -" + Opt + "=<value> - " + HelpText + "\n"
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" =v1 - desc1\n")
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.str());
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// clang-format on
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}
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TEST_F(PrintOptionInfoTest, PrintOptionInfoValueOptionalWithSentinel) {
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std::string Output = runTest(
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cl::ValueOptional, cl::values(clEnumValN(OptionValue::Val, "v1", "desc1"),
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clEnumValN(OptionValue::Val, "", "")));
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// clang-format off
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EXPECT_EQ(Output,
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(" -" + Opt + " - " + HelpText + "\n"
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" -" + Opt + "=<value> - " + HelpText + "\n"
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" =v1 - desc1\n")
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.str());
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// clang-format on
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}
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TEST_F(PrintOptionInfoTest, PrintOptionInfoValueOptionalWithSentinelWithHelp) {
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std::string Output = runTest(
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cl::ValueOptional, cl::values(clEnumValN(OptionValue::Val, "v1", "desc1"),
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clEnumValN(OptionValue::Val, "", "desc2")));
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// clang-format off
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EXPECT_EQ(Output, (" -" + Opt + " - " + HelpText + "\n"
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" -" + Opt + "=<value> - " + HelpText + "\n"
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" =v1 - desc1\n"
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" =<empty> - desc2\n")
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.str());
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// clang-format on
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}
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TEST_F(PrintOptionInfoTest, PrintOptionInfoValueRequiredWithEmptyValueName) {
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std::string Output = runTest(
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cl::ValueRequired, cl::values(clEnumValN(OptionValue::Val, "v1", "desc1"),
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clEnumValN(OptionValue::Val, "", "")));
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// clang-format off
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EXPECT_EQ(Output, (" -" + Opt + "=<value> - " + HelpText + "\n"
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" =v1 - desc1\n"
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" =<empty>\n")
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.str());
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// clang-format on
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}
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TEST_F(PrintOptionInfoTest, PrintOptionInfoEmptyValueDescription) {
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std::string Output = runTest(
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cl::ValueRequired, cl::values(clEnumValN(OptionValue::Val, "v1", "")));
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// clang-format off
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EXPECT_EQ(Output,
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(" -" + Opt + "=<value> - " + HelpText + "\n"
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" =v1\n").str());
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// clang-format on
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}
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class GetOptionWidthTest : public ::testing::Test {
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public:
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enum class OptionValue { Val };
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template <typename... Ts>
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size_t runTest(StringRef ArgName, Ts... OptionAttributes) {
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StackOption<OptionValue> TestOption(ArgName, cl::desc("some help"),
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OptionAttributes...);
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return getOptionWidth(TestOption);
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}
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private:
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// This is a workaround for cl::Option sub-classes having their
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// printOptionInfo
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// functions private.
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size_t getOptionWidth(const cl::Option &O) { return O.getOptionWidth(); }
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};
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TEST_F(GetOptionWidthTest, GetOptionWidthArgNameLonger) {
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StringRef ArgName("a-long-argument-name");
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size_t ExpectedStrSize = (" -" + ArgName + "=<value> - ").str().size();
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EXPECT_EQ(
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runTest(ArgName, cl::values(clEnumValN(OptionValue::Val, "v", "help"))),
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ExpectedStrSize);
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}
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TEST_F(GetOptionWidthTest, GetOptionWidthFirstOptionNameLonger) {
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StringRef OptName("a-long-option-name");
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size_t ExpectedStrSize = (" =" + OptName + " - ").str().size();
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EXPECT_EQ(
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runTest("a", cl::values(clEnumValN(OptionValue::Val, OptName, "help"),
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clEnumValN(OptionValue::Val, "b", "help"))),
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ExpectedStrSize);
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}
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TEST_F(GetOptionWidthTest, GetOptionWidthSecondOptionNameLonger) {
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StringRef OptName("a-long-option-name");
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size_t ExpectedStrSize = (" =" + OptName + " - ").str().size();
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EXPECT_EQ(
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runTest("a", cl::values(clEnumValN(OptionValue::Val, "b", "help"),
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clEnumValN(OptionValue::Val, OptName, "help"))),
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ExpectedStrSize);
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}
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TEST_F(GetOptionWidthTest, GetOptionWidthEmptyOptionNameLonger) {
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size_t ExpectedStrSize = StringRef(" =<empty> - ").size();
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// The length of a=<value> (including indentation) is actually the same as the
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// =<empty> string, so it is impossible to distinguish via testing the case
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// where the empty string is picked from where the option name is picked.
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EXPECT_EQ(runTest("a", cl::values(clEnumValN(OptionValue::Val, "b", "help"),
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clEnumValN(OptionValue::Val, "", "help"))),
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ExpectedStrSize);
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}
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TEST_F(GetOptionWidthTest,
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GetOptionWidthValueOptionalEmptyOptionWithNoDescription) {
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StringRef ArgName("a");
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// The length of a=<value> (including indentation) is actually the same as the
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// =<empty> string, so it is impossible to distinguish via testing the case
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// where the empty string is ignored from where it is not ignored.
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// The dash will not actually be printed, but the space it would take up is
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// included to ensure a consistent column width.
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size_t ExpectedStrSize = (" -" + ArgName + "=<value> - ").str().size();
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EXPECT_EQ(runTest(ArgName, cl::ValueOptional,
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cl::values(clEnumValN(OptionValue::Val, "value", "help"),
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clEnumValN(OptionValue::Val, "", ""))),
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ExpectedStrSize);
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}
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TEST_F(GetOptionWidthTest,
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GetOptionWidthValueRequiredEmptyOptionWithNoDescription) {
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// The length of a=<value> (including indentation) is actually the same as the
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// =<empty> string, so it is impossible to distinguish via testing the case
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// where the empty string is picked from where the option name is picked
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size_t ExpectedStrSize = StringRef(" =<empty> - ").size();
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EXPECT_EQ(runTest("a", cl::ValueRequired,
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cl::values(clEnumValN(OptionValue::Val, "value", "help"),
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clEnumValN(OptionValue::Val, "", ""))),
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ExpectedStrSize);
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}
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} // anonymous namespace
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