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From: Stefan Xenos <sxenos@google.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: Taylor Blau <me@ttaylorr.com>, git@vger.kernel.org
Subject: Re: Git Evolve
Date: Tue, 2 Oct 2018 12:35:40 -0700	[thread overview]
Message-ID: <CAPL8ZiupaJ0ZoyUzgFWm9cV5QypXXUi6wZkmbOf8OGXJa0ZJQA@mail.gmail.com> (raw)
In-Reply-To: <877ej0iuhc.fsf@evledraar.gmail.com>

If you're curious how the Mercurial absorb command works, here's the code:

https://www.mercurial-scm.org/repo/hg/file/tip/hgext/absorb.py

It's GPL 2:

https://www.mercurial-scm.org/repo/hg/file/tip/COPYING



On Tue, Oct 2, 2018 at 2:11 AM, Ævar Arnfjörð Bjarmason
<avarab@gmail.com> wrote:
>
> On Tue, Oct 02 2018, Taylor Blau wrote:
>
>> Hi Stefan,
>>
>> On Sat, Sep 29, 2018 at 04:00:04PM -0700, Stefan Xenos wrote:
>>> Hello, List!
>>>
>>> I'm interested in porting something like Mercurial's evolve command to
>>> Git.
>>
>> Welcome to Git :-). I think that the discussion in this thread is good,
>> but it's not why I'm replying. I have also wanted a Mercurial feature in
>> Git, but a different one than yours.
>>
>> Specifically, I've wanted the 'hg absorb' command. My understanding of
>> the commands functionality is that it builds a sort of flamegraph-esque
>> view of the blame, and then cascades downwards parts of a change. I am
>> sure that I'm not doing the command justice, so I'll defer to [1] where
>> it is explained in more detail.
>>
>> The benefit of this command is that it gives you a way to--without
>> ambiguity--absorb changes into earlier commits, and in fact, the
>> earliest commit that they make sense to belong to.
>>
>> This would simplify my workflow greatly when re-rolling patches, as I
>> often want to rewrite a part of an earlier commit. This is certainly
>> possible by a number of different `git rebase` invocations (e.g., (1)
>> create fixup commits, and then re-order them, or (2) mark points in your
>> history as 'edit', and rewrite them in a detached state, and I'm sure
>> many more).
>>
>> I'm curious if you or anyone else has thought about how this might work
>> in Git.
>
> I've wanted a "git absorb" for a while, but have done no actual work on
> it, I just found out about it.
>
> I think a combination of these two heuristics would probably do the
> trick:
>
>  1. If a change in your "git diff" output has a hunk whose lines overlap
>     with an earlier commit in the @{u}.. range, we do the equivalent of
>     "git add -p", select that hunk, and "git commit --fixup <that
>     commit>". We fixup the most recent commit that matches (otherwise
>     commit>we'd conflict).
>
>  2. Have some mode where we fall back from #1 and consider changes to
>     entire files, if that's unambiguous.
>
> The neat thing about this would be that you could tweak how promiscuous
> #1 would be via the -U option to git-diff, and #2 would just be a
> special case of -U9999999999999 (we should really add a -Uinf...).
>
> Then once you ran this you could run "git rebase -i --autosquash" to see
> how the TODO list would look, and optionally have some "git absorb
> --now" or whatever to do the "git add -p", "git commit --fixup" and "git
> rebase --autosquash" all in one go.
>
>> [1]: http://files.lihdd.net/hgabsorb-note.pdf

  reply	other threads:[~2018-10-02 19:35 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-29 23:00 Git Evolve Stefan Xenos
2018-09-30  0:55 ` Junio C Hamano
2018-09-30 20:17   ` Stefan Xenos
2018-10-04 16:05   ` Jakub Narebski
2018-10-04 17:29     ` Stefan Xenos
2018-10-01 12:37 ` Derrick Stolee
2018-10-31 21:12   ` Stefan Xenos
2018-10-02  1:23 ` Taylor Blau
2018-10-02  9:11   ` Ævar Arnfjörð Bjarmason
2018-10-02 19:35     ` Stefan Xenos [this message]
2018-10-02 22:25     ` Kyle Meyer
2018-10-02 23:09     ` Taylor Blau
2018-11-09 13:06     ` Johannes Schindelin

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