From: Junio C Hamano <gitster@pobox.com>
To: Barret Rhoden <brho@google.com>
Cc: "René Scharfe" <l.s.r@web.de>,
git@vger.kernel.org, "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>,
"David Kastrup" <dak@gnu.org>, "Jeff King" <peff@peff.net>,
"Jeff Smith" <whydoubt@gmail.com>,
"Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
"Stefan Beller" <stefanbeller@gmail.com>
Subject: Re: [PATCH v2 2/3] blame: add the ability to ignore commits and their changes
Date: Wed, 23 Jan 2019 11:26:18 -0800 [thread overview]
Message-ID: <xmqqo987b2g5.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <20190122143500.397abc8e@gnomeregan.cam.corp.google.com> (Barret Rhoden's message of "Tue, 22 Jan 2019 14:35:00 -0500")
Barret Rhoden <brho@google.com> writes:
>> So... I dunno.
>
> I guess if you swap the lines as well as change them,...
> ... Then it won't have the semantic knowledge that "one" == "1". If a user
> is ignoring a commit, we don't have an oracle that knows exactly what
> that commit did to determine what commit the user wants blamed.
Yeah, and if the original had two adjacent lines, and replacement
has three adjacent lines, the algorithm would not even know if
- the first line in the original was split into first two in the
update and the second line was modified in place; or
- the first line in the original was modified in place and the
second line was split into the latter two lines in the update
In short, there is no answer to "what is the corresponding line of
this line before this commit changed it?" in general, and any
algorithm, as long as it tries to see what was the "corresponding
line" of the line that is blamed to a commit, would not produce
results human readers would expect all the time.
As you said, heuristics may get us far enough to be useful, though
;-).
next prev parent reply other threads:[~2019-01-23 19:26 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-07 21:30 [PATCH] blame: add the ability to ignore commits Barret Rhoden
2019-01-07 23:13 ` Junio C Hamano
2019-01-08 16:27 ` Barret Rhoden
2019-01-08 18:26 ` Junio C Hamano
2019-01-09 20:48 ` Barret Rhoden
2019-01-10 22:29 ` Junio C Hamano
2019-01-14 15:19 ` Barret Rhoden
2019-01-14 17:45 ` Junio C Hamano
2019-01-14 18:26 ` Randall S. Becker
2019-01-14 19:03 ` Barret Rhoden
2019-01-15 6:08 ` Junio C Hamano
2019-01-09 21:21 ` Stefan Beller
2019-01-08 13:12 ` Ævar Arnfjörð Bjarmason
2019-01-08 16:41 ` Barret Rhoden
2019-01-08 18:04 ` Barret Rhoden
2019-01-17 20:29 ` [PATCH v2 0/3] " Barret Rhoden
2019-01-17 20:29 ` [PATCH v2 1/3] Move init_skiplist() outside of fsck Barret Rhoden
2019-01-18 9:25 ` Johannes Schindelin
2019-01-18 9:45 ` Ævar Arnfjörð Bjarmason
2019-01-18 17:36 ` Junio C Hamano
2019-01-18 20:59 ` Johannes Schindelin
2019-01-18 21:30 ` Jeff King
2019-01-18 22:26 ` Ævar Arnfjörð Bjarmason
2019-01-22 7:12 ` Jeff King
2019-01-22 9:46 ` Ævar Arnfjörð Bjarmason
2019-01-22 17:54 ` Junio C Hamano
2019-01-22 18:28 ` Jeff King
2019-01-17 20:29 ` [PATCH v2 2/3] blame: add the ability to ignore commits and their changes Barret Rhoden
2019-01-18 9:47 ` Johannes Schindelin
2019-01-18 17:33 ` Barret Rhoden
2019-01-20 18:19 ` René Scharfe
2019-01-22 15:26 ` Barret Rhoden
2019-01-22 18:14 ` Junio C Hamano
2019-01-22 19:35 ` Barret Rhoden
2019-01-23 19:26 ` Junio C Hamano [this message]
2019-02-01 20:37 ` Barret Rhoden
2019-01-17 20:29 ` [PATCH v2 3/3] blame: add a config option to mark ignored lines Barret Rhoden
2019-01-18 10:03 ` Johannes Schindelin
2019-01-18 9:52 ` [PATCH v2 0/3] blame: add the ability to ignore commits Ævar Arnfjörð Bjarmason
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