[LLVMbugs] [Bug 19919] New: Feature request: Enable automatic color output without terminfo

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19919

            Bug ID: 19919
           Summary: Feature request: Enable automatic color output without
                    terminfo
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: daniel at constexpr.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12590
  --> http://llvm.org/bugs/attachment.cgi?id=12590&action=edit
Patch to fall-back to git's algorithm if terminfo is unavailable

Curretnly llvm needs to be build with terminfo support in order for colors to
be enabled automatically in clang diagnostics.

ncurses/terminfo is a bit of a heavy dependency if all you want is to determine
color support as that is pretty much universal for today's *nix terminal
emulators. This requirement for terminfo was introduced in r187874.

There has been some discussion on this on the mailing lis:
https://groups.google.com/forum/#!topic/llvm-dev/MqpXVMy6OrM

A suggestion from there that I'd like to see implemented is falling back to the
much simpler algorithm used by git to determine if the terminal supports color
codes:
https://github.com/git/git/blob/21ff9151e811059f5576ca906c519ee5bb5b925e/color.c#L183

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