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From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
To: Thomas Gummerer <t.gummerer@gmail.com>
Cc: Eric Sunshine <sunshine@sunshineco.com>,
	Git List <git@vger.kernel.org>, Duy Nguyen <pclouds@gmail.com>,
	Junio C Hamano <gitster@pobox.com>
Subject: Re: [RFC PATCH 2/4] range-diff: don't remove funcname from inner diff
Date: Wed, 17 Apr 2019 13:52:37 +0200 (CEST)
Message-ID: <nycvar.QRO.7.76.6.1904171350310.46@tvgsbejvaqbjf.bet> (raw)
In-Reply-To: <20190415185627.GB1704@hank.intra.tgummerer.com>

Hi Thomas,

On Mon, 15 Apr 2019, Thomas Gummerer wrote:

> On 04/15, Johannes Schindelin wrote:
>
> > On Sun, 14 Apr 2019, Eric Sunshine wrote:
> >
> > > On Sun, Apr 14, 2019 at 5:09 PM Thomas Gummerer <t.gummerer@gmail.com> wrote:
> > > > [...]
> > > > However it can still be useful to have the function name that 'git
> > > > diff' extracts as additional context for the change.
> > > > [...]
> > > > Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
> > > > ---
> > > > diff --git a/range-diff.c b/range-diff.c
> > > > @@ -102,9 +102,12 @@ static int read_patches(const char *range, struct string_list *list)
> > > > +               } else if (starts_with(line.buf, "@@ ")) {
> > > > +                       char *skip_lineno = strstr(line.buf + 3, "@@");
> > > > +                       strbuf_remove(&line, 0, skip_lineno - line.buf);
> > >
> > > It makes me a bit uncomfortable that this is not checking for NULL
> > > return from strstr() before doing pointer arithmetic (even though the
> > > input is presumably machine-generated).
> > >
> > >     if (!skip_lineno)
> > >         BUG(...);
> >
> > Good point, but maybe we should not go so far as to declare this a bug,
> > and fall back to removing everything bug the initial two `at` characters
> > instead?
>
> I like declaring this a bug.  We are after all parsing
> machine-generated output, that does come from git (which is why I
> neglected the NULL checking in the first place).  If that second "@@"
> is not there it's definitely a bug somewhere in the diff machinery,
> I'd say.

Ah, but you do know about the micro-project I proposed to optionally feed
an mbox to `range-diff`, right?

The idea behind my proposal is that this would make it possible to
generate a range-diff between the patches on public-inbox and the commits
that actually made it into Junio's `pu`...

> Note that the "@@" also couldn't come from anywhere else, the diff
> header has a well defined format and so does the metadata.  The diff
> itself is prefixed with '<', '>' and '#' in this case, and the commit
> message is also prefixed with four spaces.  So if this breaks
> somewhere I'd rather hear about it loudly, than let users potentially
> get wrong output because we missed something somewhere.

Agreed. But I could imagine that `die()`ing here would be the more
appropriate way to holler loudly ;-)

Ciao,
Dscho

  reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-11 11:17 incorrect range-diff output? Duy Nguyen
2019-04-11 22:05 ` Thomas Gummerer
2019-04-12  8:41   ` Johannes Schindelin
2019-04-14 21:12     ` Thomas Gummerer
2019-04-12  9:21   ` Duy Nguyen
2019-04-12 15:02   ` Junio C Hamano
2019-04-14 21:20     ` Thomas Gummerer
2019-04-15  2:01       ` Junio C Hamano
2019-04-15 12:40     ` Johannes Schindelin
2019-04-14 21:09   ` [RFC PATCH 0/4] output improvements for git range-diff Thomas Gummerer
2019-04-14 21:09     ` [RFC PATCH 1/4] range-diff: fix function parameter indentation Thomas Gummerer
2019-04-14 21:09     ` [RFC PATCH 2/4] range-diff: don't remove funcname from inner diff Thomas Gummerer
2019-04-14 23:21       ` Eric Sunshine
2019-04-15 12:54         ` Johannes Schindelin
2019-04-15 18:56           ` Thomas Gummerer
2019-04-17 11:52             ` Johannes Schindelin [this message]
2019-04-24 18:15               ` Thomas Gummerer
2019-04-15 12:53       ` Johannes Schindelin
2019-04-15 18:57         ` Thomas Gummerer
2019-04-14 21:09     ` [RFC PATCH 3/4] range-diff: add section header instead of diff header Thomas Gummerer
2019-04-14 23:29       ` Eric Sunshine
2019-04-15  6:28         ` Johannes Sixt
2019-04-15 13:01         ` Johannes Schindelin
2019-04-15 19:09           ` Thomas Gummerer
2019-04-14 21:09     ` [RFC PATCH 4/4] range-diff: add section headers to the outer hunk header Thomas Gummerer
2019-04-15 12:44       ` Johannes Schindelin
2019-04-15 18:48         ` Thomas Gummerer
2019-04-15 12:47     ` [RFC PATCH 0/4] output improvements for git range-diff Johannes Schindelin
2019-04-15 19:25       ` Thomas Gummerer

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