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Fallback option for colorized output when terminfo isn't available

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Try to detect the terminal color support by checking the value of the
TERM environment variable. This is not great, but it's better than
nothing when terminfo library isn't available, which may still be the
case on some Linux distributions.

Differential Revision: https://reviews.llvm.org/D42055

llvm-svn: 322962
This commit is contained in:
Petr Hosek 2018-01-19 17:10:55 +00:00
parent 84b233d19c
commit 37e37092ad
1 changed files with 15 additions and 0 deletions
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15
lib/Support/Unix/Process.inc
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@ -369,6 +369,21 @@ static bool terminalHasColors(int fd) {
// Return true if we found a color capabilities for the current terminal. // Return true if we found a color capabilities for the current terminal.
if (HasColors) if (HasColors)
return true; return true;
#else
// When the terminfo database is not available, check if the current terminal
// is one of terminals that are known to support ANSI color escape codes.
if (const char *TermStr = std::getenv("TERM")) {
return StringSwitch<bool>(TermStr)
.Case("ansi", true)
.Case("cygwin", true)
.Case("linux", true)
.StartsWith("screen", true)
.StartsWith("xterm", true)
.StartsWith("vt100", true)
.StartsWith("rxvt", true)
.EndsWith("color", true)
.Default(false);
}
#endif #endif
// Otherwise, be conservative. // Otherwise, be conservative.