Paul Eggert <eggert@HIDDEN>
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Full text available.Paul Eggert <eggert@HIDDEN>
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From: "Garreau\, Alexandre" <galex-713@HIDDEN>
To: Paul Eggert <eggert@HIDDEN>
Subject: Re: bug#31537: Combining -v and -A/-B/-C options
References: <5inf21x35mjn.xl4.xxuns.g6.gal@HIDDEN>
<98464d15-2b9c-1635-04c4-cc3f5ce70979@HIDDEN>
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Content preview: Le 20/05/2018 à 18h03, Paul Eggert a écrit : > 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]|$)'", and I don't see any
easy way to do the same > search under the changes you're proposing. [...]
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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Le 20/05/2018 =C3=A0 18h03, Paul Eggert a =C3=A9crit=C2=A0:
> Garreau, Alexandre wrote:
>> I believe context options used in conjonction with invert-match option
>> should specify which lines*not to show* along with matched then not
>> shown lines.
>
> I can see it the other way. For example, "show all lines that lack
> signed integers, plus their context" can be done via a command like
> "grep -C1 -v -E=20
> '[-+][0-9]+([^.e]|$)'", 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:
--=-=-=
Content-Type: text/x-sh
Content-Disposition: inline; filename=apt.sh
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
--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
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:
--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline; filename=opposite.log
Content-Transfer-Encoding: quoted-printable
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
--=-=-=
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>
--=-=-=--
bug-grep@HIDDEN:bug#31537; Package grep.
Full text available.Received: (at 31537) by debbugs.gnu.org; 21 May 2018 01:03:15 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sun May 20 21:03:15 2018 Received: from localhost ([127.0.0.1]:42295 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1fKZEI-0002T3-NN for submit <at> debbugs.gnu.org; Sun, 20 May 2018 21:03:14 -0400 Received: from zimbra.cs.ucla.edu ([131.179.128.68]:33264) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eggert@HIDDEN>) id 1fKZEG-0002Sl-Lp for 31537 <at> debbugs.gnu.org; Sun, 20 May 2018 21:03:13 -0400 Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 33BD3160522; Sun, 20 May 2018 18:03:06 -0700 (PDT) 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 I4f_0vISfNpr; Sun, 20 May 2018 18:03:05 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 70235160527; Sun, 20 May 2018 18:03:05 -0700 (PDT) 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 ss1j8edmXp7S; Sun, 20 May 2018 18:03:05 -0700 (PDT) Received: from [192.168.1.9] (unknown [47.154.30.119]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 30116160522; Sun, 20 May 2018 18:03:05 -0700 (PDT) Subject: Re: bug#31537: Combining -v and -A/-B/-C options To: "Garreau, Alexandre" <galex-713@HIDDEN>, 31537 <at> debbugs.gnu.org References: <5inf21x35mjn.xl4.xxuns.g6.gal@HIDDEN> From: Paul Eggert <eggert@HIDDEN> Openpgp: preference=signencrypt Autocrypt: addr=eggert@HIDDEN; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECHgECF4AACgkQ7ZfpDmKqfjRRGw/+Ij03dhYfYl/gXVRiuzV1gGrbHk+t nfrI/C7fAeoFzQ5tVgVinShaPkZo0HTPf18x6IDEdAiO8Mqo1yp0CtHmzGMCJ50o4Grgfjlr 6g/+vtEOKbhleszN2XpJvpwM2QgGvn/laTLUu8PH9aRWTs7qJJZKKKAb4sxYc92FehPu6FOD 0dDiyhlDAq4lOV2mdBpzQbiojoZzQLMQwjpgCTK2572eK9EOEQySUThXrSIz6ASenp4NYTFH s9tuJQvXk9gZDdPSl3bp+47dGxlxEWLpBIM7zIONw4ks4azgT8nvDZxA5IZHtvqBlJLBObYY 0Le61Wp0y3TlBDh2qdK8eYL426W4scEMSuig5gb8OAtQiBW6k2sGUxxeiv8ovWu8YAZgKJfu oWI+uRnMEddruY8JsoM54KaKvZikkKs2bg1ndtLVzHpJ6qFZC7QVjeHUh6/BmgvdjWPZYFTt N+KA9CWX3GQKKgN3uu988yznD7LnB98T4EUH1HA/GnfBqMV1gpzTvPc4qVQinCmIkEFp83zl +G5fCjJJ3W7ivzCnYo4KhKLpFUm97okTKR2LW3xZzEW4cLSWO387MTK3CzDOx5qe6s4a91Zu ZM/j/TQdTLDaqNn83kA4Hq48UHXYxcIh+Nd8k/3w6lFuoK0wrOFiywjLx+0ur5jmmbecBGHc 1xdhAFHOwU0ETIByZAEQAKaF678T9wyH4wjTrV1Pz3cDEoSnV/0ZUrOT37p1dcGyj/IXq1x6 70HRVahAmk0sZpYc25PF9D5GPYHFWlNjuPU96rDndXB3hedmBRhLdC4bAXjI4DV+bmdVe+q/ IMnlZRaVlm9EiMCVAR6w13sReu7qXkW9r3RwY2AzXskp/tAe4BRKr1Zmbvi2nbnQ6epEC42r Rbx0B1EhjbIQZ5JHGk24iPT7LdBgnNmos5wYjzwNlkMQD5T0Ydzhk7J+UxwA5m46mOhRDC2r FV/A0gm5TLy8DXjv/Esc4gYnYai6SQqnUEVh5LuV8YCJBnijs+Tiw71x1icmn6xGI45EugJO gec+rLypYgpVp4x0HI5T88qBRYCkxH3Kg8Qo+EWNA9A4LRQ9DX8njona0gf0s03tocK8kBN6 6UoqqPtHBnc4eMgBymCflK12eKfd2YYxnyg9cZazWA5VslvTxpm76hbg5oiAEH/Vg/8MxHyA nPhfrgwyPrmJEcVBafdspJnYQxBYNco2LFPIhlOvWh8r4at+s+M3Lb26oUTczlgdW1Sf3SDA 77BMRnF0FQyE+7AzV79MBN4ykiqaezQxtaF1Fy/tvkhffSo8u+dwG0EgJh+te38gTcISVr0G IPplLz6YhjrbHrPRF1CN5UuL9DBGjxuN35RLNVEfta6RUFlR6NctTjvrABEBAAHCwWUEGAEC AA8FAkyAcmQCGwwFCRLMAwAACgkQ7ZfpDmKqfjSrHA/+KzAKvTxRhA9MWNLxIyJ7S5uJ16gs T3oCjZrBKGEhKMOGX4O0GA6VOEryO7QRCCYah3oxSG38IAnNeiwJXgU9Bzkk85UGbPEd7HGF /VSeHCQwWou6jqUDTSDvn9YhNTdG0KXPM74aC+xr2Zow1O2mhXihgWKD0Dw+0LYPnUOsQ0KO FxHXXYHmRrS1OZPU59BLvc+TRhIhafSHKLwbXK+6ckkxBx6h8z5ccpG0Qs4bFhdFYnFrEieD LoGmnE2YLhdV6swJ9VNCS6pLiEohT3fm7aXm15tZOIyzMZhHRSAPblXxQ0ZSWjq8oRrcYNFx c4W1URpAkBCOYJoXvQfD5L3lqAl8TCqDUzYxhH/tJhbDdHrqHH767jaDaTB1+Talp/2AMKwc XNOdiklGxbmHVG6YGl6g8Lrbsu9NZEI4yLlHzuikthJWgz+3vZhVGyNlt+HNIoF6CjDL2omu 5cEq4RDHM44QqPk6l7O0pUvN1mT4B+S1b08RKpqm/ff015E37HNV/piIvJlxGAYz8PSfuGCB 1thMYqlmgdhd9/BabGFbGGYHA6U4/T5zqU+f6xHy1SsAQZ1MSKlLwekBIT+4/cLRGqCHjnV0 q5H/T6a7t5mPkbzSrOLSo4puj+IToNjYyYIDBWzhlA19avOa+rvUjmHtD3sFN7cXWtkGoi8b uNcby4U= Organization: UCLA Computer Science Department Message-ID: <98464d15-2b9c-1635-04c4-cc3f5ce70979@HIDDEN> Date: Sun, 20 May 2018 18:03:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <5inf21x35mjn.xl4.xxuns.g6.gal@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 31537 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 (---) 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).
bug-grep@HIDDEN:bug#31537; Package grep.
Full text available.Received: (at submit) by debbugs.gnu.org; 20 May 2018 01:57:13 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat May 19 21:57:13 2018 Received: from localhost ([127.0.0.1]:41488 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1fKDay-0007yo-81 for submit <at> debbugs.gnu.org; Sat, 19 May 2018 21:57:12 -0400 Received: from eggs.gnu.org ([208.118.235.92]:54275) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <galex-713@HIDDEN>) id 1fKDaw-0007yb-5K for submit <at> debbugs.gnu.org; Sat, 19 May 2018 21:57:10 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <galex-713@HIDDEN>) id 1fKDaq-00026r-7y for submit <at> debbugs.gnu.org; Sat, 19 May 2018 21:57:05 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-0.0 required=5.0 tests=BAYES_40 autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:39509) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from <galex-713@HIDDEN>) id 1fKDaq-00026l-3U for submit <at> debbugs.gnu.org; Sat, 19 May 2018 21:57:04 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45246) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <galex-713@HIDDEN>) id 1fKDao-0000q1-Sn for bug-grep@HIDDEN; Sat, 19 May 2018 21:57:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <galex-713@HIDDEN>) id 1fKDao-00026D-24 for bug-grep@HIDDEN; Sat, 19 May 2018 21:57:02 -0400 Received: from [2a00:5884:8305::1] (port=53732 helo=galex-713.eu) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from <galex-713@HIDDEN>) id 1fKDan-00025F-MG for bug-grep@HIDDEN; Sat, 19 May 2018 21:57:01 -0400 Received: from [::1] (helo=PC713) by galex-713.eu with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from <galex-713@HIDDEN>) id 1fKCwq-0004RJ-09 for bug-grep@HIDDEN; Sun, 20 May 2018 03:15:44 +0200 From: "Garreau\, Alexandre" <galex-713@HIDDEN> To: bug-grep@HIDDEN Subject: Combining -v and -A/-B/-C options User-Agent: Gnus (5.13), GNU Emacs 25.1.1 (x86_64-pc-linux-gnu) X-GPG-FINGERPRINT: E109 9988 4197 D7CB B0BC 5C23 8DEB 24BA 867D 3F7F X-Accept-Language: fr, en, it, eo Date: Sun, 20 May 2018 03:15:43 +0200 Message-ID: <5inf21x35mjn.xl4.xxuns.g6.gal@HIDDEN> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit 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: -5.0 (-----) --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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! --=-=-=--
"Garreau\, Alexandre" <galex-713@HIDDEN>:bug-grep@HIDDEN.
Full text available.bug-grep@HIDDEN:bug#31537; Package grep.
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