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Subject: bug#31537: Combining -v and -A/-B/-C options
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From: "Garreau\, Alexandre" <galex-713@HIDDEN>
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It seems using a context option (-A (after-), -B (before-) or -C
(context)) when -v (invert-match) is in use just do nothing as well as
disabling the later. I don=E2=80=99t see the utility of this behavior, as =
well
as I didn=E2=80=99t see it documented anywhere in the description of any of
these options.
I believe context options used in conjonction with invert-match option
should specify which lines *not to show* along with matched then not
shown lines.
For instance, while this command:
--=-=-=
Content-Type: text/x-sh
Content-Disposition: inline; filename=without-2.sh
Content-Description: does show the list of numbers going from 1 to 100,
without those ending with =?utf-8?B?4oCcMuKAnQ==?= in base 10
seq 1 100 | grep -v '2$'
--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
does show the list of numbers going from 1 to 100, without those ending
with =E2=80=9C2=E2=80=9D in base 10, this one:
--=-=-=
Content-Type: text/x-sh
Content-Disposition: inline; filename=without-2-and-3.sh
Content-Description: does show the list of numbers going from 1 to 100,
without those ending with either =?utf-8?B?4oCcMuKAnQ==?= or
=?utf-8?B?4oCcM+KAnQ==?= in base 10
seq 1 100 | grep -v '2$' -A 1
--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
should also hide the lines ending with =E2=80=9C3=E2=80=9D because they sys=
tematically
follow those ending with =E2=80=9C2=E2=80=9D (currently it just show all th=
e numbers
from 1 to 100).
I didn=E2=80=99t look at if grep does act differently according the order
options are given, but if so maybe this behavior could be triggered only
if the context option were specified *after* the invert-match one?
Thank you for any attention!
--=-=-=--
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: "Garreau\, Alexandre" <galex-713@HIDDEN> Subject: bug#31537: Acknowledgement (Combining -v and -A/-B/-C options) Message-ID: <handler.31537.B.152678143330682.ack <at> debbugs.gnu.org> References: <5inf21x35mjn.xl4.xxuns.g6.gal@HIDDEN> X-Gnu-PR-Message: ack 31537 X-Gnu-PR-Package: grep Reply-To: 31537 <at> debbugs.gnu.org Date: Sun, 20 May 2018 01:58:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-grep@HIDDEN If you wish to submit further information on this problem, please send it to 31537 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 31537: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D31537 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#31537: Combining -v and -A/-B/-C options
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Garreau, Alexandre wrote:
> I believe context options used in conjonction with invert-match option
> should specify which lines*not to show* along with matched then not
> shown lines.
I can see it the other way. For example, "show all lines that lack signed=
=20
integers, plus their context" can be done via a command like "grep -C1 -v=
-E=20
'[-+][0-9]+([^.e]|$)'", and I don't see any easy way to do the same searc=
h under=20
the changes you're proposing.
In essence you're proposing a new feature that I'd call "negative context=
";=20
i.e., if a line is not selected, then suppress the output of nearby lines=
that=20
are selected. grep already has a lot of features and it's not clear this =
one is=20
important enough to add.
> maybe this behavior could be triggered only
> if the context option were specified *after* the invert-match one
I'd prefer option order to not matter, at least when options do not simpl=
y=20
override each other (as is the case here).
X-Loop: help-debbugs@HIDDEN
Subject: bug#31537: Combining -v and -A/-B/-C options
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Content preview: Le 20/05/2018 =?UTF-8?Q?=C3?= 18h03, Paul Eggert a =?UTF-8?Q?=C3=A9crit=C2?= : > Garreau,
Alexandre wrote: >> I believe context options used in conjonction with invert-match
option >> should specify which lines*not to show* along with matched then
not >> shown lines. > > I can see it the other way. For example, "show all
lines that lack > signed integers, plus their context" can be done via a
command like > "grep -C1 -v -E > '[-+][0-9]+([^.e]|$)'", and I don't see any
easy way to do the same > search under the changes you're proposing. [...]
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Le 20/05/2018 =C3=A0 18h03, Paul Eggert a =C3=A9crit=C2=A0:
> Garreau, Alexandre wrote:
>> I believe context options used in conjonction with invert-match option
>> should specify which lines*not to show* along with matched then not
>> shown lines.
>
> I can see it the other way. For example, "show all lines that lack
> signed integers, plus their context" can be done via a command like
> "grep -C1 -v -E=20
> '[-+][0-9]+([^.e]|$)'", and I don't see any easy way to do the same
> search under the changes you're proposing.
Oh in fact, I didn=E2=80=99t notice it actually had this effect=E2=80=A6 in=
fact when
only a few lines don=E2=80=99t match, especially when they=E2=80=99re not c=
ontiguous,
using -v with context options nearly equals not using grep at all=E2=80=A6 =
turns
out I narrowed enough my mind to miss this.
> In essence you're proposing a new feature that I'd call "negative
> context"; i.e., if a line is not selected, then suppress the output of
> nearby lines that are selected. grep already has a lot of features and
> it's not clear this one is important enough to add.
My memory is bad, but grepping at looking at my history for when I made
up this example says me I needed this feature for something like this:
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Content-Description: suppressing through grep all library packages and their
(normally
2 lines) descriptions afterwards
apt search programming ant | grep -v '^lib' -A 2 | less
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Here I guess we=E2=80=99re in a case where sed would be better suited=E2=80=
=A6 like a
bunch of today=E2=80=99s features of grep (invert-match, personally I belie=
ve it
would naturally be handy with it): they both come from ed
after all. But this seems to be, as coincidently said today on #emacs
(and later outside I heard [1]), a case of:
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Content-Description: Portion of discussion on #emacs
[CEST]
[03:16:37] <JordiGH> Don't you love it when you have commands like
[03:16:54] <JordiGH> do_the_thing --nope-this-option-makes-me-do-the-opposi=
te-of-the-thing
[03:17:00] <JordiGH> Currently thinking of
[03:17:07] <JordiGH> ssh-keygen -R
[03:17:13] <chu> It's the Unix way
[03:17:14] <JordiGH> That -R makes it delete a key instead of generating on=
e.
[03:17:55] <twb> ssh-keygen is a random grab-bag utility that does lots of =
things, and yes, it's dumb
[03:18:13] <JordiGH> It's the git way.
[03:19:16] <JordiGH> sort --random-sort
[=E2=80=A6]
[03:19:24] <JordiGH> Isn't that, like, the opposite of sorting?
[PS=C2=A0: JordiGH agreed to be quoted in pm, and before that]
[06:37:04] <galex-713> twb: can I quote you too?
[06:38:11] <galex-713> chu: what about you then, too?
[06:38:41] <twb> galex-713: sure, you can quote that
[08:20:01] <chu> galex-713: it's fine
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Content-Type: text/plain
>> maybe this behavior could be triggered only
>> if the context option were specified *after* the invert-match one
>
> I'd prefer option order to not matter, at least when options do not
> simply override each other (as is the case here).
Agree, would add more complexity of use. And keywords are made to get
rid of order considerations anyway.
[1] Unix options that make commands do the opposite of their name: <https://mathstodon.xyz/@JordiGH/100064804426272107>
--=-=-=--
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Received: (at control) by debbugs.gnu.org; 1 Jan 2020 07:42:23 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed Jan 01 02:42:23 2020 Received: from localhost ([127.0.0.1]:35580 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1imYe7-0006Na-8A for submit <at> debbugs.gnu.org; Wed, 01 Jan 2020 02:42:23 -0500 Received: from zimbra.cs.ucla.edu ([131.179.128.68]:48664) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eggert@HIDDEN>) id 1imYe5-0006NL-8p for control <at> debbugs.gnu.org; Wed, 01 Jan 2020 02:42:21 -0500 Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id DF64A16008F for <control <at> debbugs.gnu.org>; Tue, 31 Dec 2019 23:42:15 -0800 (PST) Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id syeXkWbt7vLH for <control <at> debbugs.gnu.org>; Tue, 31 Dec 2019 23:42:15 -0800 (PST) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 4D2F716027C for <control <at> debbugs.gnu.org>; Tue, 31 Dec 2019 23:42:15 -0800 (PST) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 8pQxhJRlYl5y for <control <at> debbugs.gnu.org>; Tue, 31 Dec 2019 23:42:15 -0800 (PST) Received: from [192.168.1.9] (cpe-23-242-74-103.socal.res.rr.com [23.242.74.103]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 2F05E16022A for <control <at> debbugs.gnu.org>; Tue, 31 Dec 2019 23:42:15 -0800 (PST) To: control <at> debbugs.gnu.org From: Paul Eggert <eggert@HIDDEN> Subject: 31537 is wishlist Organization: UCLA Computer Science Department Message-ID: <3ee81e4b-505c-66ab-8176-2b8c5e1deabd@HIDDEN> Date: Tue, 31 Dec 2019 23:42:14 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) severity 31537 wishlist tags 31537 + notabug
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