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From: "Michał Kępień" <michal@isc.org>
To: git@vger.kernel.org
Subject: [PATCH 0/2] diff: add -I<regex> that ignores matching changes
Date: Thu,  1 Oct 2020 14:06:04 +0200	[thread overview]
Message-ID: <20201001120606.25773-1-michal@isc.org> (raw)

This patch series adds a new diff option that enables ignoring changes
whose all lines (changed, removed, and added) match a given regular
expression.  This is similar to the -I option in standalone diff
utilities and can be used e.g. to look for unrelated changes in commits
containing a large number of automatically applied modifications (e.g. a
tree-wide string replacement).  The difference between -G/-S and the new
-I option is that the latter filters output on a per-change basis.

I personally found this feature handy quite a few times while reviewing
patches and a quick web search yields some questions from other people
looking for something like this, so I thought I would take a shot at
submitting it upstream.

Please note that while this patch series in its current shape builds,
seems to pass tests, and appears to work as I would expect it to, this
is my first attempt at contributing to Git and I did come across a few
stumbling blocks:

  - Instead of adding an extra flag for 'xdl_opts', would it be better
    to make sure xpparam_t structures are always zero-initialized before
    xdl_diff() is called (see commit message for patch 1 for context)?

  - If this patch series is accepted, should xdl_mark_ignorable() be
    renamed to something like xdl_mark_ignorable_blank() for slightly
    improved code clarity?

  - Would a more thorough explanation of the option help or hurt?

  - Given that hunk emitting rules are the same for the -I option
    proposed in this patch series as for --ignore-blank-lines, is it
    necessary to duplicate the (impressively extensive!)
    --inter-hunk-context tests in t/t4015-diff-whitespace.sh for -I?  I
    decided against doing that for the time being (though I did add some
    basic tests for such scenarios in patch 2, see the "with -U1" test).

  - Should tests be added in a separate commit?  This is what I did as I
    thought it would help with readability, but...

Thanks in advance for taking a look!

Michał Kępień (2):
  diff: add -I<regex> that ignores matching changes
  t: add -I<regex> tests

 Documentation/diff-options.txt |   3 +
 diff.c                         |  16 ++
 diff.h                         |   2 +
 t/t4069-diff-ignore-regex.sh   | 330 +++++++++++++++++++++++++++++++++
 xdiff/xdiff.h                  |   2 +
 xdiff/xdiffi.c                 |  36 ++++
 6 files changed, 389 insertions(+)
 create mode 100755 t/t4069-diff-ignore-regex.sh

-- 
2.28.0


             reply	other threads:[~2020-10-01 12:45 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01 12:06 Michał Kępień [this message]
2020-10-01 12:06 ` [PATCH 1/2] " Michał Kępień
2020-10-01 18:21   ` Junio C Hamano
2020-10-07 19:48     ` Michał Kępień
2020-10-07 20:08       ` Junio C Hamano
2020-10-01 12:06 ` [PATCH 2/2] t: add -I<regex> tests Michał Kępień
2020-10-01 17:02 ` [PATCH 0/2] diff: add -I<regex> that ignores matching changes Junio C Hamano
2020-10-12  9:17 ` [PATCH v2 0/3] " Michał Kępień
2020-10-12  9:17   ` [PATCH v2 1/3] merge-base, xdiff: zero out xpparam_t structures Michał Kępień
2020-10-12 11:14     ` Johannes Schindelin
2020-10-12 17:09       ` Junio C Hamano
2020-10-12 19:52     ` Junio C Hamano
2020-10-13  6:35       ` Michał Kępień
2020-10-12  9:17   ` [PATCH v2 2/3] diff: add -I<regex> that ignores matching changes Michał Kępień
2020-10-12 11:20     ` Johannes Schindelin
2020-10-12 20:00       ` Junio C Hamano
2020-10-12 20:39         ` Johannes Schindelin
2020-10-12 21:43           ` Junio C Hamano
2020-10-13  6:37             ` Michał Kępień
2020-10-13 15:49               ` Junio C Hamano
2020-10-13  6:36       ` Michał Kępień
2020-10-13 12:02         ` Johannes Schindelin
2020-10-13 15:53           ` Junio C Hamano
2020-10-13 18:45           ` Michał Kępień
2020-10-12 18:01     ` Junio C Hamano
2020-10-13  6:38       ` Michał Kępień
2020-10-12 20:04     ` Junio C Hamano
2020-10-13  6:38       ` Michał Kępień
2020-10-12  9:17   ` [PATCH v2 3/3] t: add -I<regex> tests Michał Kępień
2020-10-12 11:49     ` Johannes Schindelin
2020-10-13  6:38       ` Michał Kępień
2020-10-13 12:00         ` Johannes Schindelin
2020-10-13 16:00           ` Junio C Hamano
2020-10-13 19:01           ` Michał Kępień
2020-10-15 11:45             ` Johannes Schindelin
2020-10-15  7:24   ` [PATCH v3 0/2] diff: add -I<regex> that ignores matching changes Michał Kępień
2020-10-15  7:24     ` [PATCH v3 1/2] merge-base, xdiff: zero out xpparam_t structures Michał Kępień
2020-10-15  7:24     ` [PATCH v3 2/2] diff: add -I<regex> that ignores matching changes Michał Kępień
2020-10-16 15:32       ` Phillip Wood
2020-10-16 18:04         ` Junio C Hamano
2020-10-19  9:48           ` Michał Kępień
2020-10-16 18:16       ` Junio C Hamano
2020-10-19  9:55         ` Michał Kępień
2020-10-19 17:29           ` Junio C Hamano
2020-10-16 10:00     ` [PATCH v3 0/2] " Johannes Schindelin
2020-10-20  6:48     ` [PATCH v4 " Michał Kępień
2020-10-20  6:48       ` [PATCH v4 1/2] merge-base, xdiff: zero out xpparam_t structures Michał Kępień
2020-10-20  6:48       ` [PATCH v4 2/2] diff: add -I<regex> that ignores matching changes Michał Kępień
2021-02-05 14:13       ` [PATCH 1/2] diff: add an API for deferred freeing Ævar Arnfjörð Bjarmason
2021-02-10 16:00         ` Johannes Schindelin
2021-02-11  3:00           ` Ævar Arnfjörð Bjarmason
2021-02-11  9:40             ` Johannes Schindelin
2021-02-11 10:21               ` Jeff King
2021-02-11 10:45                 ` [PATCH v2 0/2] " Ævar Arnfjörð Bjarmason
2021-02-11 10:45                 ` [PATCH v2 1/2] " Ævar Arnfjörð Bjarmason
2021-02-11 10:45                 ` [PATCH v2 2/2] diff: plug memory leak from regcomp() on {log,diff} -I Ævar Arnfjörð Bjarmason
2021-02-05 14:13       ` [PATCH " Ævar Arnfjörð Bjarmason

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