Re: [PATCH] git-diff: don't use colors when stdout is not a tty.

Michel Marti [off-list ref] wrote:

Currently, with diff-coloring enabled, git-diff outputs color escape
sequences even if stdout is redirected (not a tty). This is rather annoying
when trying to further process the output. This patch teaches the diff command
to only do its coloring stuff when a pager is in use or stdout is a tty.

Set color.diff to auto instead of true.