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From: Barret Rhoden <brho@google.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: git@vger.kernel.org, Stefan Beller <stefanbeller@gmail.com>,
	Jeff Smith <whydoubt@gmail.com>, Jeff King <peff@peff.net>
Subject: Re: [PATCH] blame: add the ability to ignore commits
Date: Mon, 14 Jan 2019 10:19:56 -0500
Message-ID: <20190114101956.2b899d0e@brho.roam.corp.google.com> (raw)
In-Reply-To: <xmqq1s5k16zj.fsf@gitster-ct.c.googlers.com>

On 2019-01-10 at 14:29 Junio C Hamano <gitster@pobox.com> wrote:
> > For instance, commit X does this:
> >
> > -foo(x,y);
> > +foo(x,y,z);
> >
> > Then commit Y comes along to reformat it:
> >
> > -foo(x,y,z);
> > +foo(x, y, z);
> >
> > And the history / rev-list for the file looks like:
> >
> > ---O---A---X---B---C---D---Y---E---F
> >
> > I want to ignore/skip Y and see X in the blame output.    
> 
> If you skip Y, the altered history would have "foo(x, y, z)" in E,
> "foo(x,y,z)" in X, and "foo(x,y)" in A.  If you start blaming from
> F, you'd get E as the commit that explains the latest state.  If you
> do not skip Y, you'd get Y.  I am not sure how you'd get X in either
> case.  

The way to do it is to let the blames get passed to Y - don't yank it
from the graph.  Then when trying to pass the blames from Y to its
parent, when we get a diff chunk that Y is responsible for, instead of
keeping it on Y's suspect list, we hand the blame_entry to D.  That
blame_entry will get passed all the way back to X, which also has a
diff that touches that line.

Basically we do the same blame processing as usual, but just don't let
any blames stick to Y.

Barret


  reply index

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-07 21:30 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 [this message]
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
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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