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From: "Michał Kępień" <michal@isc.org>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org
Subject: Re: [PATCH v2 2/3] diff: add -I<regex> that ignores matching changes
Date: Tue, 13 Oct 2020 08:38:03 +0200	[thread overview]
Message-ID: <20201013063803.GD3278@larwa.hq.kempniu.pl> (raw)
In-Reply-To: <xmqqk0vvpbmp.fsf@gitster.c.googlers.com>

> > +-I<regex>::
> 
> Since we are mimicking other folks' feature, giving also the
> 
> --ignore-matching-lines=<regex>
> 
> synonym to that their users are familiar with would be a good idea,
> no?

Some diff implementations (e.g. the OpenBSD one) lack the long option
and I was aiming for the "greatest common divisor" for all diff
implementations, but sure, I do not see how adding the synonym could
hurt.  I will do that in v3.

> > @@ -5203,6 +5207,22 @@ static int diff_opt_patience(const struct option *opt,
> >  	return 0;
> >  }
> >  
> > +static int diff_opt_ignore_regex(const struct option *opt,
> > +				 const char *arg, int unset)
> > +{
> > +	struct diff_options *options = opt->value;
> > +	regex_t *regex;
> > +
> > +	BUG_ON_OPT_NEG(unset);
> > +	regex = xcalloc(1, sizeof(*regex));
> > +	if (regcomp(regex, arg, REG_EXTENDED | REG_NEWLINE))
> > +		die("invalid regex: %s", arg);
> > +	ALLOC_GROW(options->ignore_regex, options->ignore_regex_nr + 1,
> > +		   options->ignore_regex_alloc);
> > +	options->ignore_regex[options->ignore_regex_nr++] = regex;
> > +	return 0;
> > +}
> 
> Don't these parse-options callback functions have a way to tell the
> caller die instead of them themselves dying like this?  Would it
> work better to "return error(... message ...)", or would that give
> two error messages?

Yes, that would indeed look better, thanks - just one error message is
generated when "return error(...)" is used.  I just failed to notice
that it is a thing.  I will use it in v3.

> In anycase, this is end-user facing, so we'd
> want it to be localizable, e.g.
> 
> 	die(_("invalid regexp given to -I: '%s'", arg));
> 
> probably.

Absolutely, I will fix that in v3.  I tried to mimic what other similar
code in the tree does and a quick `git grep 'die.*regex'` yielded mostly
non-localized strings, so I settled for one as well.

-- 
Best regards,
Michał Kępień

  reply	other threads:[~2020-10-13  6:38 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01 12:06 [PATCH 0/2] " Michał Kępień
2020-10-01 12:06 ` [PATCH 1/2] " Michał Kępień
2020-10-01 18:21   ` Junio C Hamano
2020-10-07 19:48     ` Michał Kępień
2020-10-07 20:08       ` Junio C Hamano
2020-10-01 12:06 ` [PATCH 2/2] t: add -I<regex> tests Michał Kępień
2020-10-01 17:02 ` [PATCH 0/2] diff: add -I<regex> that ignores matching changes Junio C Hamano
2020-10-12  9:17 ` [PATCH v2 0/3] " Michał Kępień
2020-10-12  9:17   ` [PATCH v2 1/3] merge-base, xdiff: zero out xpparam_t structures Michał Kępień
2020-10-12 11:14     ` Johannes Schindelin
2020-10-12 17:09       ` Junio C Hamano
2020-10-12 19:52     ` Junio C Hamano
2020-10-13  6:35       ` Michał Kępień
2020-10-12  9:17   ` [PATCH v2 2/3] diff: add -I<regex> that ignores matching changes Michał Kępień
2020-10-12 11:20     ` Johannes Schindelin
2020-10-12 20:00       ` Junio C Hamano
2020-10-12 20:39         ` Johannes Schindelin
2020-10-12 21:43           ` Junio C Hamano
2020-10-13  6:37             ` Michał Kępień
2020-10-13 15:49               ` Junio C Hamano
2020-10-13  6:36       ` Michał Kępień
2020-10-13 12:02         ` Johannes Schindelin
2020-10-13 15:53           ` Junio C Hamano
2020-10-13 18:45           ` Michał Kępień
2020-10-12 18:01     ` Junio C Hamano
2020-10-13  6:38       ` Michał Kępień [this message]
2020-10-12 20:04     ` Junio C Hamano
2020-10-13  6:38       ` Michał Kępień
2020-10-12  9:17   ` [PATCH v2 3/3] t: add -I<regex> tests Michał Kępień
2020-10-12 11:49     ` Johannes Schindelin
2020-10-13  6:38       ` Michał Kępień
2020-10-13 12:00         ` Johannes Schindelin
2020-10-13 16:00           ` Junio C Hamano
2020-10-13 19:01           ` Michał Kępień
2020-10-15 11:45             ` Johannes Schindelin
2020-10-15  7:24   ` [PATCH v3 0/2] diff: add -I<regex> that ignores matching changes Michał Kępień
2020-10-15  7:24     ` [PATCH v3 1/2] merge-base, xdiff: zero out xpparam_t structures Michał Kępień
2020-10-15  7:24     ` [PATCH v3 2/2] diff: add -I<regex> that ignores matching changes Michał Kępień
2020-10-16 15:32       ` Phillip Wood
2020-10-16 18:04         ` Junio C Hamano
2020-10-19  9:48           ` Michał Kępień
2020-10-16 18:16       ` Junio C Hamano
2020-10-19  9:55         ` Michał Kępień
2020-10-19 17:29           ` Junio C Hamano
2020-10-16 10:00     ` [PATCH v3 0/2] " Johannes Schindelin
2020-10-20  6:48     ` [PATCH v4 " Michał Kępień
2020-10-20  6:48       ` [PATCH v4 1/2] merge-base, xdiff: zero out xpparam_t structures Michał Kępień
2020-10-20  6:48       ` [PATCH v4 2/2] diff: add -I<regex> that ignores matching changes Michał Kępień
2021-02-05 14:13       ` [PATCH 1/2] diff: add an API for deferred freeing Ævar Arnfjörð Bjarmason
2021-02-10 16:00         ` Johannes Schindelin
2021-02-11  3:00           ` Ævar Arnfjörð Bjarmason
2021-02-11  9:40             ` Johannes Schindelin
2021-02-11 10:21               ` Jeff King
2021-02-11 10:45                 ` [PATCH v2 0/2] " Ævar Arnfjörð Bjarmason
2021-02-11 10:45                 ` [PATCH v2 1/2] " Ævar Arnfjörð Bjarmason
2021-02-11 10:45                 ` [PATCH v2 2/2] diff: plug memory leak from regcomp() on {log,diff} -I Ævar Arnfjörð Bjarmason
2021-02-05 14:13       ` [PATCH " Ævar Arnfjörð Bjarmason

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