From: Taylor Blau <me@ttaylorr.com>
To: Eric Sunshine <sunshine@sunshineco.com>
Cc: "Taylor Blau" <me@ttaylorr.com>, "Git List" <git@vger.kernel.org>,
"Junio C Hamano" <gitster@pobox.com>,
"René Scharfe" <l.s.r@web.de>,
"Martin Ågren" <martin.agren@gmail.com>,
"Jeff King" <peff@peff.net>
Subject: Re: [PATCH v2 1/6] grep.c: take regmatch_t as argument in match_line()
Date: Sun, 22 Apr 2018 16:30:50 -0700 [thread overview]
Message-ID: <20180422233050.GD48072@syl.local> (raw)
In-Reply-To: <CAPig+cRfCZQ8aPvc6AVoojtpuiWgNS_9A+9m5mV2mOC1BwemQQ@mail.gmail.com>
On Sun, Apr 22, 2018 at 07:14:58PM -0400, Eric Sunshine wrote:
> On Sun, Apr 22, 2018 at 4:47 PM, Taylor Blau <me@ttaylorr.com> wrote:
> > In a subsequent patch, we teach show_line() to optionally include the
> > column number of the first match on each matched line.
> >
> > The regmatch_t involved in match_line() and match_one_pattern() both
> > contain this information (via regmatch_t->rm_so), but their current
> > implementation throws this stack variable away at the end of the call.
> >
> > Instead, let's teach match_line() to take in a 'regmatch_t *' so that
> > callers can inspect the result of their calls. This will prove useful in
> > a subsequent commit when a caller will forward on information from the
> > regmatch_t into show_line (as described above).
> >
> > The return condition remains unchanged, therefore the only change
> > required of callers is the addition of a single argument.
>
> Is 'rm_so' the only piece of information which callers will ever want
> to extract from 'regmatch_t'? If so, this patch's approach might be
> overly broad, unnecessarily exposing too much of match_lines()'s
> internal implementation. An alternative would be to narrow the
> interface and limit exposure by passing in an 'int *matched_col' or
> some such.
>
> (Not necessarily a big deal, but something to consider.)
Thanks; I do not think that this is overly broad, although I suppose
that it does bind us to the implementation of regmatch_t. The definition
of regmatch_t, however, is fairly minimal:
typedef struct
{
regoff_t rm_so; /* Byte offset from string's start to substring's start. */
regoff_t rm_eo; /* Byte offset from string's start to substring's end. */
} regmatch_t;
I can imagine that other callers would be interested in the other piece
of information, 'rm_eo', as well. Therefore, I think it makes sense to
provide access to it along with 'rm_so'.
I think that if we are concerned with being bound to regmatch_t, then we
could typedef a new struct that contains a 'start' and 'end' unsigned,
but I think that this extra effort would not be fruitful, since the
majority of grep.c assumes regmatch_t (and friends).
> > Signed-off-by: Taylor Blau <me@ttaylorr.com>
> > ---
> > diff --git a/grep.c b/grep.c
> > @@ -1299,17 +1299,17 @@ static int match_expr(struct grep_opt *opt, char *bol, char *eol,
> > static int match_line(struct grep_opt *opt, char *bol, char *eol,
> > - enum grep_context ctx, int collect_hits)
> > + regmatch_t *match, enum grep_context ctx,
> > + int collect_hits)
> > {
> > struct grep_pat *p;
> > - regmatch_t match;
> >
> > if (opt->extended)
> > return match_expr(opt, bol, eol, ctx, collect_hits);
>
> The new 'match' argument has no impact in the 'opt->extended' case.
> Perhaps this deserves calling out in the commit message.
I have noted this in the commit message, which I'll include in the next
re-roll.
Thanks,
Taylor
next prev parent reply other threads:[~2018-04-22 23:30 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 [this message]
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
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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