From: Taylor Blau <me@ttaylorr.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: "Martin Ågren" <martin.agren@gmail.com>,
"Phillip Wood" <phillip.wood@dunelm.org.uk>,
"Git Mailing List" <git@vger.kernel.org>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"René Scharfe" <l.s.r@web.de>,
"Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>,
"Jeff King" <peff@peff.net>,
"Eric Sunshine" <sunshine@sunshineco.com>
Subject: Re: [PATCH v5 5/7] builtin/grep.c: add '--column' option to 'git-grep(1)'
Date: Fri, 11 May 2018 20:27:33 -0700 [thread overview]
Message-ID: <20180512032733.GA65308@syl.local> (raw)
In-Reply-To: <xmqqefikl6jx.fsf@gitster-ct.c.googlers.com>
On Thu, May 10, 2018 at 09:04:34AM +0900, Junio C Hamano wrote:
> Taylor Blau <me@ttaylorr.com> writes:
>
> > This check we should retain and change the wording to mention '--and',
> > '--or', and '--not' specifically.
>
> Why are these problematic in the first place? If I said
>
> $ git grep -e first --and -e these
> $ git grep -e first --and --not -e those
> $ git grep -e first --or -e those
>
> I'd expect that the first line of this paragraph will hit, and the
> first hit for these three are "these", "first" and "first",
> respectively. Most importantly, in the last one, "--or" can be
> omitted and the whole thing stops being "extended", so rejecting
> extended as a whole does not make much sense.
Agreed that this is what I would expect, too. The trouble is that we
never do a compilation step from containing --and, --or, --not to a
POSIX regexp. So, if we're extended, we have to assume that there might
not be an answer.
Given this, I don't think we should categorically die() when we
encounter this (more below in the next hunk of this mail). I think this
thread has established that there are certainly cases where we cannot
provide a meaningful answer, (--not at the top-level, for instance) but
there are cases where we can (as you indicate above).
One day, I would like to support --column with --and, --or, or --not in
cases where there _is_ a definite answer. That said, omitting this
information for now and at least not die()-ing I think is worth taking
this patch earlier, and leaving some #leftoverbits.
> $ git grep -v second
> $ git grep --not -e second
>
> may hit all lines in this message (except for the obvious two
> lines), but we cannot say which column we found a hit. I am
> wondering if it is too grave a sin to report "the whole line is what
> satisfied the criteria given" and say the match lies at column #1.
I think that is sensible. I previously was opposed to this because I
thought that it would be too difficult to script around the 'sometimes
we have columns but other times not' and 'I gave --column' but have to
check whether or not they are really there.
I no longer believe that my above argument is sound. It simplifies the
matter greatly to simply not share columns when we don't have a good
answer, and do when we do.
In other terms:
* not giving '--column' will _never_ give a column,
* '--column --invert' will _always_ die(), and
* '--column --[and | or | not]' will _never_ give a column.
Thanks,
Taylor
next prev parent reply other threads:[~2018-05-12 3:27 UTC|newest]
Thread overview: 108+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1524281843.git.me@ttaylorr.com>
2018-04-21 3:45 ` [PATCH 1/6] grep.c: take regmatch_t as argument in match_line() Taylor Blau
2018-04-22 20:47 ` [PATCH v2 0/6] Teach '--column-number' to 'git-grep(1)' Taylor Blau
2018-04-22 20:47 ` [PATCH v2 1/6] grep.c: take regmatch_t as argument in match_line() Taylor Blau
2018-04-22 23:14 ` Eric Sunshine
2018-04-22 23:30 ` Taylor Blau
2018-04-22 20:47 ` [PATCH v2 2/6] grep.c: take column number as argument to show_line() Taylor Blau
2018-04-23 0:16 ` Eric Sunshine
2018-04-23 1:17 ` Taylor Blau
2018-04-23 3:30 ` Eric Sunshine
2018-04-23 7:27 ` Ævar Arnfjörð Bjarmason
2018-04-23 7:34 ` Eric Sunshine
2018-04-24 4:27 ` Taylor Blau
2018-04-23 8:01 ` Ævar Arnfjörð Bjarmason
2018-04-24 4:31 ` Taylor Blau
2018-04-24 6:13 ` Junio C Hamano
2018-04-24 18:34 ` Taylor Blau
2018-04-22 20:47 ` [PATCH v2 3/6] grep.[ch]: teach columnnum, color_columnno to grep_opt Taylor Blau
2018-04-22 21:42 ` Ævar Arnfjörð Bjarmason
2018-04-22 23:24 ` Taylor Blau
2018-04-23 0:21 ` Eric Sunshine
2018-04-23 1:11 ` Taylor Blau
2018-04-22 20:47 ` [PATCH v2 4/6] grep.c: display column number of first match Taylor Blau
2018-04-23 0:24 ` Eric Sunshine
2018-04-23 1:12 ` Taylor Blau
2018-04-22 20:47 ` [PATCH v2 5/6] builtin/grep.c: show column numbers via --column-number Taylor Blau
2018-04-22 21:48 ` Ævar Arnfjörð Bjarmason
2018-04-22 23:26 ` Taylor Blau
2018-04-23 0:32 ` Eric Sunshine
2018-04-23 1:14 ` Taylor Blau
2018-04-22 20:47 ` [PATCH v2 6/6] contrib/git-jump/git-jump: use column number when grep-ing Taylor Blau
2018-04-22 21:49 ` Ævar Arnfjörð Bjarmason
2018-04-22 23:27 ` Taylor Blau
2018-04-22 23:28 ` [PATCH v2 0/6] Teach '--column-number' to 'git-grep(1)' Junio C Hamano
2018-04-22 23:34 ` Taylor Blau
2018-04-23 13:46 ` Junio C Hamano
2018-04-24 5:07 ` [PATCH v3 0/7] " Taylor Blau
2018-04-24 5:07 ` [PATCH v3 1/7] Documentation/config.txt: camel-case lineNumber for consistency Taylor Blau
2018-04-24 5:07 ` [PATCH v3 2/7] grep.c: expose matched column in match_line() Taylor Blau
2018-04-24 5:07 ` [PATCH v3 3/7] grep.[ch]: extend grep_opt to allow showing matched column Taylor Blau
2018-04-24 5:07 ` [PATCH v3 4/7] grep.c: display column number of first match Taylor Blau
2018-04-24 5:42 ` Eric Sunshine
2018-04-24 5:07 ` [PATCH v3 5/7] builtin/grep.c: add '--column-number' option to 'git-grep(1)' Taylor Blau
2018-04-24 5:07 ` [PATCH v3 6/7] grep.c: add configuration variables to show matched option Taylor Blau
2018-04-24 5:07 ` [PATCH v3 7/7] contrib/git-jump/git-jump: jump to match column in addition to line Taylor Blau
2018-04-24 5:37 ` Eric Sunshine
2018-04-24 18:39 ` Taylor Blau
2018-05-05 2:42 ` [PATCH v4 0/7] Teach '--column' to 'git-grep(1)' Taylor Blau
2018-05-05 2:42 ` [PATCH v4 1/7] Documentation/config.txt: camel-case lineNumber for consistency Taylor Blau
2018-05-05 2:42 ` [PATCH v4 2/7] grep.c: expose matched column in match_line() Taylor Blau
2018-05-08 6:08 ` René Scharfe
2018-05-05 2:42 ` [PATCH v4 3/7] grep.[ch]: extend grep_opt to allow showing matched column Taylor Blau
2018-05-05 2:43 ` [PATCH v4 4/7] grep.c: display column number of first match Taylor Blau
2018-05-05 2:43 ` [PATCH v4 5/7] builtin/grep.c: add '--column' option to 'git-grep(1)' Taylor Blau
2018-05-05 6:15 ` Duy Nguyen
2018-05-07 23:38 ` Taylor Blau
2018-05-06 17:43 ` Phillip Wood
2018-05-06 17:56 ` Ævar Arnfjörð Bjarmason
2018-05-07 23:40 ` Taylor Blau
2018-05-07 14:13 ` Junio C Hamano
2018-05-08 0:08 ` Taylor Blau
2018-05-05 2:43 ` [PATCH v4 6/7] grep.c: add configuration variables to show matched option Taylor Blau
2018-05-05 2:43 ` [PATCH v4 7/7] contrib/git-jump/git-jump: jump to match column in addition to line Taylor Blau
2018-05-06 14:43 ` Martin Ågren
2018-05-06 18:03 ` Ævar Arnfjörð Bjarmason
2018-05-07 23:35 ` Taylor Blau
2018-05-09 2:13 ` [PATCH v5 0/7] Teach '--column' to 'git-grep(1)' Taylor Blau
2018-05-09 2:13 ` [PATCH v5 1/7] Documentation/config.txt: camel-case lineNumber for consistency Taylor Blau
2018-05-09 2:13 ` [PATCH v5 2/7] grep.c: expose matched column in match_line() Taylor Blau
2018-05-09 2:13 ` [PATCH v5 3/7] grep.[ch]: extend grep_opt to allow showing matched column Taylor Blau
2018-05-09 2:13 ` [PATCH v5 4/7] grep.c: display column number of first match Taylor Blau
2018-05-09 2:13 ` [PATCH v5 5/7] builtin/grep.c: add '--column' option to 'git-grep(1)' Taylor Blau
2018-05-09 10:41 ` Phillip Wood
2018-05-09 17:26 ` Martin Ågren
2018-05-09 23:52 ` Taylor Blau
2018-05-10 0:04 ` Junio C Hamano
2018-05-10 5:58 ` René Scharfe
2018-05-10 6:43 ` Junio C Hamano
2018-05-12 3:27 ` Taylor Blau [this message]
2018-05-12 5:08 ` Junio C Hamano
2018-05-12 5:19 ` Taylor Blau
2018-05-12 6:07 ` Junio C Hamano
2018-05-18 3:38 ` Taylor Blau
2018-05-18 6:27 ` Junio C Hamano
2018-05-18 21:50 ` Taylor Blau
2018-05-19 4:44 ` Taylor Blau
2018-05-09 23:49 ` Taylor Blau
2018-05-09 16:17 ` Duy Nguyen
2018-05-09 23:48 ` Taylor Blau
2018-05-09 2:13 ` [PATCH v5 6/7] grep.c: add configuration variables to show matched option Taylor Blau
2018-05-09 2:13 ` [PATCH v5 7/7] contrib/git-jump/git-jump: jump to match column in addition to line Taylor Blau
2018-05-12 3:10 ` [PATCH v6 0/7] Teach '--column' to 'git-grep(1)' Taylor Blau
2018-05-12 3:11 ` [PATCH v6 1/7] Documentation/config.txt: camel-case lineNumber for consistency Taylor Blau
2018-05-12 3:11 ` [PATCH v6 2/7] grep.c: expose matched column in match_line() Taylor Blau
2018-05-12 3:11 ` [PATCH v6 3/7] grep.[ch]: extend grep_opt to allow showing matched column Taylor Blau
2018-05-12 3:11 ` [PATCH v6 4/7] grep.c: display column number of first match Taylor Blau
2018-05-12 3:11 ` [PATCH v6 5/7] builtin/grep.c: add '--column' option to 'git-grep(1)' Taylor Blau
2018-05-12 3:11 ` [PATCH v6 6/7] grep.c: add configuration variables to show matched option Taylor Blau
2018-05-12 3:11 ` [PATCH v6 7/7] contrib/git-jump/git-jump: jump to match column in addition to line Taylor Blau
2018-04-21 3:45 ` [PATCH 2/6] grep.c: take column number as argument to show_line() Taylor Blau
2018-04-21 3:45 ` [PATCH 3/6] grep.[ch]: teach columnnum, color_columnno to grep_opt Taylor Blau
2018-04-21 8:32 ` Martin Ågren
2018-04-21 3:45 ` [PATCH 4/6] grep.c: display column number of first match Taylor Blau
2018-04-21 3:45 ` [PATCH 5/6] builtin/grep.c: show column numbers via --column-number Taylor Blau
2018-04-21 4:07 ` Junio C Hamano
2018-04-21 4:14 ` Junio C Hamano
2018-04-21 5:36 ` René Scharfe
2018-04-21 8:39 ` Martin Ågren
2018-04-21 3:45 ` [PATCH 6/6] contrib/git-jump/git-jump: use column number when grep-ing Taylor Blau
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