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From: Sergey Organov <sorganov@gmail.com>
To: Jeff King <peff@peff.net>
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: Wed, 05 Aug 2020 01:53:53 +0300	[thread overview]
Message-ID: <87d046vx8e.fsf@osv.gnss.ru> (raw)
In-Reply-To: <20200804221440.GC2022650@coredump.intra.peff.net> (Jeff King's message of "Tue, 4 Aug 2020 18:14:40 -0400")

Jeff King <peff@peff.net> writes:

> On Wed, Aug 05, 2020 at 01:06:51AM +0300, Sergey Organov wrote:
>
>> > For now, "off" is OK, but then we'll regret when "all" comes,
>> > because "off" would not exactly sit opposite to "all".
>> 
>> IMHO, "off" does not need to be opposite for "all", as it suppresses
>> diff output altogether. I read --diff-merge=off as "turn /off/ diff
>> output for merge commits".
>> 
>> Besides, "all", that I don't like either, is among "c" and "cc", all 3
>> being different versions of diffs against all the parents, no?
>
> I think "all-parents" is much more descriptive than "all" (which might
> make you think "all merges", but it has nothing to do with that). It
> would make more sense if we later add the building to say "diff against
> parent 1" or "diff against parents 1 and 3".
>
> You might also consider whether "combined" is actually mutually
> exclusive with parent selection. We have focused on which parents you'd
> want to "-m" against. But in the most general case, you could ask for a
> combined-diff between parents 1 and 3 of an octopus merge.
>
> That's just coming from the angle of "what is the most general and
> orthogonal set of features". I think the vast majority of what anyone
> would want to do would be covered by doing a diff against only a single
> parent, and then it would almost always be the first parent. And
> certainly you'd need to add a bunch of code to the combined diff
> machinery to make it support arbitrary sets of parents. So this probably
> isn't that interesting a direction to go, at least for now. I'm just
> raising the issue now because we'll be locked into the semantics of this
> option, which may not be able to express the full set of what's possible
> (so we'd be stuck adding another option later).

Makes sense, and I got an idea.

--diff-merges=<parent> will still give diff against one specific parent.

In case of combined/separate diffs, it will produce diffs against all
the parents that, if happens to be needed, could later be refined by a
new --diff-parents option that defaults to 'all'.

Then, for example,

--diff-merges=1

would finally be just a short-cut for

--diff-merges=separate --diff-parents=1

while

--diff-merges=separate --diff-parents=all

would be the same as

--diff-merges=separate (what we called "all" so far)

and then we may have

--diff-merges=condensed-combined --diff-parents=1-3,8

for the bravest ;-)

This would lead us, currently to:

--diff-merges=(off,separate,combined,condensed-combined,<parent>)

and leave us ability to implement advanced parents selection, in an
unlikely case it's needed, in a separate new option.

Thanks,
-- Sergey

  parent reply	other threads:[~2020-08-04 22:54 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 [this message]
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
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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