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bug#33123: ls: add case-sensitive --color option

From: Mikael Magnusson
Subject: bug#33123: ls: add case-sensitive --color option
Date: Tue, 10 May 2022 10:45:37 +0200


In bug #9086 [1] there was a lot of good discussion about case
insensitive matching for dircolors. This was all then summarily
ignored in [2] which made the behaviour unconditional. This breaks
coloring of uppercase files that should have a different color from
lowercase files, for example .C which is a c++ source file, not a c
source file. And as mentioned in [1] it is also very useful to notice
incorrectly (eg uppercase extension files) quickly by them being
white, so you can fix them.

I'm not sure if the suggestion in this bug (33123) is good though;
since ls --color=auto-case will just error on older releases, you
can't easily sync your aliases. Unfortunately ls also ignores all of
LS_COLORS if it contains any unknown values (why??) so we can't add a
"CS" field there for case sensitiveness either (unless there's some
extra options field already I don't know about?).

If anyone has some ideas I would be happy to produce a patch (assuming
you don't need copyright assignment).

[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=9086
[2] https://lists.gnu.org/archive/html/coreutils/2018-06/msg00011.html

Mikael Magnusson

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