grep --no-index: allow use of "git grep" outside a git repository
Just like some people wanted diff features that are not found in
other people's diff implementations outside of a git repository
and added --no-index mode to the command, this adds --no-index mode
to the "git grep" command.
Also, inside a git repository, --no-index mode allows you to grep
in untracked (but not ignored) files.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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