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From: Jeff King <peff@peff.net>
To: Sergey Organov <sorganov@gmail.com>
Cc: Junio C Hamano <gitster@pobox.com>,
	git@vger.kernel.org, Chris Torek <chris.torek@gmail.com>
Subject: Re: [PATCH v2 0/7] making log --first-parent imply -m
Date: Tue, 4 Aug 2020 18:07:40 -0400	[thread overview]
Message-ID: <20200804220740.GA2022650@coredump.intra.peff.net> (raw)
In-Reply-To: <87y2muxf5m.fsf@osv.gnss.ru>

On Wed, Aug 05, 2020 at 12:41:25AM +0300, Sergey Organov wrote:

> >> It's 4 lines above, as it's in fact common for all the cases but the
> >> first one.
> >
> > Ah, I missed that. That raises more questions, though. ;)
> >
> > For "-m" we do not need to set revs->diff; why do we need to do so
> > here?
> 
> Good question!
> 
> I believe --diff-merges=all should reset revs->diff back to 0 to
> entirely undo all the effects of '-c' and '--cc', provided those
> appeared before on the command-line, that '-m' fails to do.

Making it counteract "--cc" makes sense, but revs->diff is used for much
more than that. So "--cc" sets revs->diff to 1, but so do many other
unrelated options (e.g., "--full-diff" for one).

I think to do it right you'd need to have this part of the code just set
a single enum variable, like:

  ...
  else if (!strcmp(arg, "--cc")) {
          revs->diff_merges = DIFF_MERGES_DENSE_COMBINED;
  } else if (!strcmp(arg, "-m")) {
          revs->diff_merges = DIFF_MERGES_ALL_PARENTS;
  }
  ...etc...

and then later resolve that into the set of flags we need:

  switch (revs->diff_merges) {
  case DIFF_MERGES_DENSE_COMBINED:
	revs->diff = 1;
	revs->dense_combined_merges = 1;
	revs->combine_merges = 1;
	revs->ignore_merges = 0;
	break;
  case DIFF_MERGES_ALL_PARENTS:
	revs->ignore_merges = 0;
	break;
  ...etc...
  }

it may even be that we can get rid of the separate combine_merges and
dense_combined_merges flag and just have callers look at
rev.diff_merges, which would simplify the code even further. But that
cleanup could also come later on top.

> Admittedly, I didn't yet check what is the outcome of, say,
> "git log -c -m". Is it = "-c", ="-m", or what?

Having looked at the code, I'm pretty sure it behaves like "-c". IMHO
that is a bug and the two should be mutually exclusive (i.e., override
each other). Changing that would not be strictly backwards, but I think
it may be OK under the notion that the current behavior is nonsense.

-Peff

  reply	other threads:[~2020-08-04 22:08 UTC|newest]

Thread overview: 86+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-28 16:36 [PATCH 0/3] making " Jeff King
2020-07-28 16:36 ` [PATCH 1/3] log: drop "--cc implies -m" logic Jeff King
2020-07-28 16:38 ` [PATCH 2/3] revision: add "--ignore-merges" option to counteract "-m" Jeff King
2020-07-28 17:52   ` Chris Torek
2020-07-29 18:42     ` Jeff King
2020-07-28 21:01   ` Junio C Hamano
2020-07-29 18:22     ` Jeff King
2020-07-29 18:30       ` Jeff King
2020-07-29 18:53         ` Junio C Hamano
2020-07-28 16:39 ` [PATCH 3/3] log: enable "-m" automatically with "--first-parent" Jeff King
2020-07-28 16:47 ` [PATCH 0/3] making --first-parent imply -m Jeff King
2020-07-28 16:48 ` Junio C Hamano
2020-07-28 16:53   ` Jeff King
2020-07-28 16:55 ` Taylor Blau
2020-07-29 20:10 ` [PATCH v2 0/7] making log " Jeff King
2020-07-29 20:10   ` [PATCH v2 1/7] log: drop "--cc implies -m" logic Jeff King
2020-07-29 20:10   ` [PATCH v2 2/7] revision: add "--no-diff-merges" option to counteract "-m" Jeff King
2020-07-29 20:10   ` [PATCH v2 3/7] log: enable "-m" automatically with "--first-parent" Jeff King
2020-07-29 20:28     ` Junio C Hamano
2020-07-29 20:11   ` [PATCH v2 4/7] doc/git-log: move "Diff Formatting" from rev-list-options Jeff King
2020-07-29 20:56     ` Junio C Hamano
2020-07-29 21:02       ` Jeff King
2020-07-29 20:11   ` [PATCH v2 5/7] doc/git-log: drop "-r" diff option Jeff King
2020-07-29 20:12   ` [PATCH v2 6/7] doc/git-log: move "-t" into diff-options list Jeff King
2020-07-29 21:10     ` Junio C Hamano
2020-07-29 21:55       ` Jeff King
2020-07-29 20:12   ` [PATCH v2 7/7] doc/git-log: clarify handling of merge commit diffs Jeff King
2020-07-29 21:03   ` [PATCH v2 0/7] making log --first-parent imply -m Chris Torek
2020-07-29 21:41   ` Sergey Organov
2020-07-31 23:08     ` Jeff King
2020-08-02 12:59       ` Sergey Organov
2020-08-02 17:35         ` Junio C Hamano
2020-08-03 15:47           ` Sergey Organov
2020-08-03 16:35             ` Junio C Hamano
2020-08-03 16:41               ` Sergey Organov
2020-08-03 17:21                 ` Junio C Hamano
2020-08-03 20:25                   ` Sergey Organov
2020-08-03 20:58                     ` Jeff King
2020-08-03 21:16                       ` Sergey Organov
2020-08-03 18:08             ` Jeff King
2020-08-03 20:00               ` Sergey Organov
2020-08-03 20:55                 ` Jeff King
2020-08-03 21:18                   ` Sergey Organov
2020-08-04 17:50               ` Sergey Organov
2020-08-04 19:42                 ` Junio C Hamano
2020-08-04 20:00                   ` Jeff King
2020-08-04 20:55                     ` Sergey Organov
2020-08-04 21:22                       ` Jeff King
2020-08-04 21:55                         ` Junio C Hamano
2020-08-04 22:06                           ` Sergey Organov
2020-08-04 22:14                             ` Jeff King
2020-08-04 22:49                               ` Junio C Hamano
2020-08-07  8:26                                 ` Jeff King
2020-08-07  9:25                                   ` Sergey Organov
2020-08-07 17:43                                   ` Junio C Hamano
2020-08-07 17:52                                     ` Sergey Organov
2020-08-07 19:01                                       ` Junio C Hamano
2020-08-07 19:12                                         ` Sergey Organov
2020-08-07 19:20                                           ` Jeff King
2020-08-07 19:28                                             ` Sergey Organov
2020-08-07 19:46                                           ` Junio C Hamano
2020-08-07 20:29                                             ` Sergey Organov
2020-08-07 20:39                                               ` Junio C Hamano
2020-08-07 21:08                                                 ` Sergey Organov
2020-08-07 21:54                                                   ` Junio C Hamano
2020-08-07 23:07                                                     ` Sergey Organov
2020-08-04 22:53                               ` Sergey Organov
2020-08-04 21:21                     ` Sergey Organov
2020-08-04 21:26                       ` Jeff King
2020-08-04 19:58                 ` Jeff King
2020-08-04 20:56                   ` Sergey Organov
2020-08-04 21:25                     ` Jeff King
2020-08-04 21:41                       ` Sergey Organov
2020-08-04 22:07                         ` Jeff King [this message]
2020-08-04 22:15                           ` Sergey Organov
2020-08-04 21:27                     ` Junio C Hamano
2020-08-04 21:44                       ` Sergey Organov
2020-08-04 21:58                   ` Sergey Organov
2020-08-04 22:08                     ` Jeff King
2020-08-04 22:26                       ` [PATCH] revision: fix die() message for "--unpacked=" Sergey Organov
2020-08-05  0:03                         ` Junio C Hamano
2020-08-05 15:37                   ` [PATCH v2 0/7] making log --first-parent imply -m Sergey Organov
2020-08-05 16:05                     ` Junio C Hamano
2020-08-05 17:55                       ` Sergey Organov
2020-08-05 19:24                         ` Junio C Hamano
2020-08-05 20:27                           ` Sergey Organov

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