From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Re: git diff-index ignores color config
Date: Tue, 26 Apr 2011 10:42:03 -0700
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To: Elias Persson <delreich@takeit.se>
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In-Reply-To: <1303830261.3387.21.camel@dhcp-141.kontor.deklomp.se> (Elias
 Persson's message of "Tue, 26 Apr 2011 17:04:21 +0200")
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Elias Persson <delreich@takeit.se> writes:

> 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.

Isn't that very much on purpose?  diff-{index,tree,files} plumbings should
not be affected by UI related configuration variables.