From: Igor Djordjevic <igor.d.djordjevic@gmail.com>
To: Pavel Kretov <firegurafiku@gmail.com>, git@vger.kernel.org
Subject: Re: [idea] File history tracking hints
Date: Mon, 11 Sep 2017 22:09:14 +0200 [thread overview]
Message-ID: <774426e0-24c9-320b-a593-b3d0865cfa68@gmail.com> (raw)
In-Reply-To: <CAOZF3=Ouvk8ccME+fXr_T=GL1j4Gx3Hgj3ao_-GQng-noeOubg@mail.gmail.com>
Hi Pavel,
On 11/09/2017 09:11, Pavel Kretov wrote:
> Hi all,
>
> Excuse me if the topic I'm going to raise here has been already discussed
> on the mailing list, forums, or IRC, but I couldn't find anything related.
>
>
> The problem:
>
> Git, being "a stupid content tracker", doesn't try to keep an eye on
> operations which happens to individual files; things like file renames
> aren't recorded during commit, but heuristically detected later.
>
> Unfortunately, the heuristic can only deal with simple file renames with
> no substantial content changes; it's helpless when you:
>
> - rename file and change it's content significantly;
> - split single file into several files;
> - merge several files into another;
> - copy entire file from another commit, and do other things like these.
>
> However, if we're able to preserve this information, it's possible
> not only to do more accurate 'git blame', but also merge revisions with
> fewer conflicts.
>
>
> The proposal:
>
> The idea is to let user give hints about what was changed during
> the commit. For example, if user did a rename which wasn't automatically
> detected, he would append something like the following to his commit
> message:
>
> Tracking-hints: rename dev-vcs/git/git-1.0.ebuild ->
> dev-vcs/git/git-2.0.ebuild
>
> or (if full paths of affected files can be unambiguously omitted):
>
> Tracking-hints: rename git-1.0.ebuild -> git-2.0.ebuild
>
> There may be other hint types:
>
> Tracking-hint: recreate LICENSE.txt
> Tracking-hint: split main.c -> main.c cmdline.c
> Tracking-hint: merge linalg.py <- vector.py matrix.py
>
> or even something like this:
>
> Tracking-hint: copy json.py <-
> libs/json.py@4db88291251151d8c5c8e4f20430fa4def2cb2ed
>
> If file transformation cannot be described by a single tracking hint, it shall
> be possible to specify a sequence of hints at once:
>
> Tracking-hint:
> split Utils.java -> AppHelpers.java StringHelpers.java
> recreate Utils.java
>
> Note that in the above example the order of operations really matters, so
> both lines have to reside in one 'Tracking-hint' block.
>
> * * *
>
> How do you think, is this idea worth implementing?
> Any other thoughts on this?
Here[1] you can find Linus` reply (from 2005-04-15) to "rename
tracking" discussion, usually quoted to explain the Git philosophy on
this point, even referred to as "one of the most important messages
in the list archive"[2] by Junio himself.
[1] https://public-inbox.org/git/Pine.LNX.4.58.0504150753440.7211@ppc970.osdl.org/
[2] https://public-inbox.org/git/xmqqr30qflk9.fsf@gitster.mtv.corp.google.com/
Regards,
Buga
next prev parent reply other threads:[~2017-09-11 20:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-11 7:11 [idea] File history tracking hints Pavel Kretov
2017-09-11 18:11 ` Stefan Beller
2017-09-11 18:47 ` Jacob Keller
2017-09-11 18:41 ` Jeff King
2017-09-11 20:09 ` Igor Djordjevic [this message]
2017-09-11 21:48 ` Philip Oakley
2017-09-13 11:38 ` Johannes Schindelin
2017-09-14 23:22 ` Philip Oakley
2017-09-29 23:12 ` Johannes Schindelin
2017-09-30 8:02 ` Jeff Hostetler
2017-09-30 15:11 ` Johannes Schindelin
2017-10-01 3:27 ` Junio C Hamano
2017-10-02 17:41 ` Stefan Beller
2017-10-02 18:51 ` Jeff Hostetler
2017-10-02 19:18 ` Stefan Beller
2017-10-02 20:02 ` Jeff Hostetler
2017-10-03 0:52 ` Junio C Hamano
2017-10-03 0:45 ` Junio C Hamano
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