Re: [PATCH] grep --no-index: allow use of "git grep" outside a git repository

From: Junio C Hamano <gitster@pobox.com>
Date: Jan 16, 2010, 01:05 UTC
Message-ID: <7vwrzin9jt.fsf@alter.siamese.dyndns.org>
In-Reply-To: <20100115210854.GA21540@coredump.intra.peff.net>

Jeff King <peff@peff.net> writes:

Show 9 quoted lines

> On Fri, Jan 15, 2010 at 12:52:40PM -0800, Junio C Hamano wrote:
>
>> 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.
>
> Out of curiosity, what are the interesting features in git grep versus
> other greps?

Three examples:

    git grep -e Junio --and -e Dscho --and -e Peff

is different from

    grep "Junio.*Dscho.*Peff"

in that the latter wouldn't find a line that has these names in different order. You can of course give permutations explicitly, like

    grep -e "Junio.*Dscho.*Peff" \
         -e "Dscho.*Junio.*Peff" \
         ...
	 -e "Peff.*Dscho.*Junio"

I don't know how you would do these with "grep":

    git grep -e Junio --and -e Dscho --and --not -e Linus

    git grep --all-match -e Junio -e Dscho