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From: Junio C Hamano <gitster@pobox.com>
To: Jeff King <peff@peff.net>
Cc: Sergey Organov <sorganov@gmail.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, 04 Aug 2020 15:49:17 -0700	[thread overview]
Message-ID: <xmqqpn86qb6a.fsf@gitster.c.googlers.com> (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:

> 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.

Yeah, we want to specify a possibly empty set of integers
(1..<num-parents>) to combine the diff; if it is empty set, we won't
see any diff.  If it is full set, we'd get the current c/cc behavior.
Anything in between we cannot currently express.  Fun ;-)

> 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. 

Yeah, it is mostly for fun--I do not see an immediate practical use
case, either.

> 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).

Yeah, but a good thing is that we won't have to worry about this
until much later, as long as we would just be introducing "diff
against no parents" and nothing else (or together with "diff against
all parents", which would make it easier to explain "-m").


  reply	other threads:[~2020-08-04 22:49 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 [this message]
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
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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