[gnuastro-devel] [task #15138] Color command-line output

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?15138>

                 Summary: Color command-line output
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Mon 31 Dec 2018 01:09:37 AM UTC
         Should Start On: Mon 31 Dec 2018 12:00:00 AM UTC
   Should be Finished on: Mon 31 Dec 2018 12:00:00 AM UTC
                Category: All Gnuastro
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: Postponed
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

In many scenarios of Gnuastro's programs, it can be really helpful if the
output text (on the command-line) is color coded. For example the new
<http://git.savannah.gnu.org/cgit/gnuastro.git/commit/?id=42347053aa>
`--verify' option to the Fits program.

Fortunately all modern terminal emulators (even on Windows), follow the same
ANSI escape codes to define colors (summary
<https://stackoverflow.com/questions/3219393/stdlib-and-colored-output-in-c#3219471>,
or full Wikipedia description
<https://en.wikipedia.org/wiki/ANSI_escape_code#Colors>.

So the job isn't too hard, it just needs some checks (to remove when the
output isn't being directly printed on a terminal, for example being piped).
We should look to see how `ls' (in GNU Coreutils) does it.




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