GNU logs - #52851, boring messages

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Subject: bug#52851: git grep feature: boolean logic
Resent-From: Kevin Connor Arpe <kevinarpe@HIDDEN>
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Hello,

Recently, I was stumped with a difficult grep problem: I needed to filter
files containing more than one regex (think: logical-and).  I didn't know
how to do this using only a single invocation of GNU grep.  (Please correct
me if I am wrong.)

A bunch of Googling led me to discover that git has a grep sub-command that
implements boolean logic with and/or/not/parens operators.  Manpage:
https://git-scm.com/docs/git-grep, Source:
https://github.com/git/git/blob/master/grep.c

At the moment, it's not possible to use git grep very well outside of git
repositories.  There are some issues around absolute and relative paths,
plus "git working directory".

Eventually, I settled on writing a crude shell script that wraps GNU grep
to provide similar functionality.  However, I am aware of its inefficiency,
as it requires multiple invocations of grep.

Are people aware of this very cool grep feature with boolean logic?  I
tried to search the GNU grep message archive, but I didn't see any
discussion about it.  I'm curious what the GNU grep team thinks about this
feature.

Kind regards,
Kevin Arpe
Hongkong

--000000000000f4bf7b05d4360333
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<div dir=3D"ltr">Hello,<div><br></div><div>Recently, I was stumped with a d=
ifficult grep problem: I needed to filter files containing more than one re=
gex (think: logical-and).=C2=A0 I didn&#39;t know how to do this using only=
 a single invocation of GNU grep.=C2=A0 (Please correct me if I am wrong.)<=
/div><div><br></div><div>A bunch of Googling led me to discover that git ha=
s a grep sub-command that implements boolean logic with and/or/not/parens o=
perators.=C2=A0 Manpage:=C2=A0<a href=3D"https://git-scm.com/docs/git-grep"=
 target=3D"_blank">https://git-scm.com/docs/git-grep</a>, Source:=C2=A0<a h=
ref=3D"https://github.com/git/git/blob/master/grep.c">https://github.com/gi=
t/git/blob/master/grep.c</a></div><div><br></div><div>At the moment, it&#39=
;s not possible to use git grep very well outside of git repositories.=C2=
=A0 There are some issues around absolute and relative paths, plus &quot;gi=
t working directory&quot;.</div><div><br></div><div>Eventually, I settled o=
n writing a crude shell script that wraps GNU grep to provide similar funct=
ionality.=C2=A0 However, I am aware of its inefficiency, as it requires mul=
tiple invocations of grep.</div><div><br></div><div>Are people aware=C2=A0o=
f this very cool grep feature with boolean=C2=A0logic?=C2=A0 I tried to sea=
rch the GNU grep message archive, but I didn&#39;t see any discussion about=
 it.=C2=A0 I&#39;m curious what the GNU grep team thinks about this feature=
.<br></div><div><br></div><div>Kind regards,</div><div>Kevin Arpe</div><div=
>Hongkong</div></div>

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Kevin Connor Arpe <kevinarpe@HIDDEN>
Subject: bug#52851: Acknowledgement (git grep feature: boolean logic)
Message-ID: <handler.52851.B.164070335032029.ack <at> debbugs.gnu.org>
References: <CAFMYRRNq4UbmD=XMEfHhVT_v52SC=W4KMpfXnDvRZd5_=MdRDg@HIDDEN>
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Date: Tue, 28 Dec 2021 14:56:02 +0000

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Message sent to bug-grep@HIDDEN:

Subject: bug#52851: git grep feature: boolean logic
Resent-From: arnold@HIDDEN
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Hi.

You may want a different tool:

	awk '/pattern1/ && /pattern2/' ...
	awk '/pattern1/ || /pattern2/' ...
	awk '/pattern1/ && !/pattern2/' ...

And so on.

Seems much easier than stuffing boolean logic into grep.

Just a thought,

Arnold

Kevin Connor Arpe <kevinarpe@HIDDEN> wrote:

> Hello,
>
> Recently, I was stumped with a difficult grep problem: I needed to filter
> files containing more than one regex (think: logical-and).  I didn't know
> how to do this using only a single invocation of GNU grep.  (Please correct
> me if I am wrong.)
>
> A bunch of Googling led me to discover that git has a grep sub-command that
> implements boolean logic with and/or/not/parens operators.  Manpage:
> https://git-scm.com/docs/git-grep, Source:
> https://github.com/git/git/blob/master/grep.c
>
> At the moment, it's not possible to use git grep very well outside of git
> repositories.  There are some issues around absolute and relative paths,
> plus "git working directory".
>
> Eventually, I settled on writing a crude shell script that wraps GNU grep
> to provide similar functionality.  However, I am aware of its inefficiency,
> as it requires multiple invocations of grep.
>
> Are people aware of this very cool grep feature with boolean logic?  I
> tried to search the GNU grep message archive, but I didn't see any
> discussion about it.  I'm curious what the GNU grep team thinks about this
> feature.
>
> Kind regards,
> Kevin Arpe
> Hongkong

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severity 52851 wishlist

Last modified: Tue, 28 Dec 2021 17:45:01 UTC

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