Having color.ui (and/or color.diff) set to auto, doing
git diff-index --check <some refspec>
on a set with e.g. trailing whitespace does not produce colored
output.
If providing the option on the command line, e.g.
git diff-index --check --color=auto <some refspec>
output _is_ colored, so obviously not an issue with tty
detection. Doesn't work when configured to 'true' either.
Documentation indicates that the config option is considered
(see under --no-color), so to me it seems like there's a bug
here, somewhere.
Most likely way of coming across this issue would be turning on
the shipped pre-commit hook sample, at least that's how I found
it. It ends (and does most of its work) with
exec git diff-index --check --cached $against --
where $against is normally HEAD.
git --version: 1.7.4.4
uname -srio: Linux 2.6.35.12-88.fc14.i686 i386 GNU/Linux
// Delreich
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