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From: "Michał Kępień" <michal@isc.org>
To: git@vger.kernel.org
Subject: [PATCH v3 0/2] diff: add -I<regex> that ignores matching changes
Date: Thu, 15 Oct 2020 09:24:04 +0200	[thread overview]
Message-ID: <20201015072406.4506-1-michal@isc.org> (raw)
In-Reply-To: <20201012091751.19594-1-michal@isc.org>

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/--ignore-matching-lines option in
standalone diff utilities and can be used e.g. to ignore changes which
only affect code comments or 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.

Changes from v2:

  - Add a long option for -I (--ignore-matching-lines) as it is
    commonplace in standalone diff utilities.  Update documentation and
    commit log messages accordingly.

  - Use xmalloc() instead of xcalloc() for allocating regex_t
    structures in diff_opt_ignore_regex().

  - Ensure the memory allocated in diff_opt_ignore_regex() gets
    released.

  - Use "return error(...)" instead of die() in the -I option callback.
    Make the relevant error message localizable.

  - Drastically reduce the number of -I<regex> tests due to excessive
    run time of t/t4069-diff-ignore-regex.sh from v1/v2 on some
    platforms (notably Windows).  Use a tweaked version of a test
    suggested by Johannes Schindelin (thanks!).  Given its reduction in
    size, squash patch 3 (which contained the tests) into patch 2.

  - Replace "see Documentation/diff-options.txt" with "-I<regex>" in the
    comments for the added structure fields, in order to make these
    comments more useful.

Changes from v1:

  - Add a new preliminary cleanup patch which ensures xpparam_t
    structures are always zero-initialized.  (This was a prerequisite
    for the next change below.)

  - Do not add a new 'xdl_opts' flag to check whether -I was used;
    instead, just check whether the array of regular expressions to
    match against is non-NULL.

  - Enable the -I option to be used multiple times.  As a consequence of
    this, regular expressions are now "pre-compiled" in the option's
    callback (and passed around as an array of regex_t structures)
    rather than deep down in xdiff code.  Add test cases exercising use
    of multiple -I options in the same git invocation.  Update
    documentation accordingly.

  - Rename xdl_mark_ignorable() to xdl_mark_ignorable_lines(), to
    indicate that it is logically a "sibling" of
    xdl_mark_ignorable_regex() rather than its "parent".

  - Optimize xdl_mark_ignorable_regex() by making it immediately skip
    changes already marked as ignored by xdl_mark_ignorable_lines().

  - Fix coding style issue in the prototype part of the definition of
    xdl_mark_ignorable_regex().

  - Add "/* see Documentation/diff-options.txt */" comments for the
    fields added to struct diff_options and xpparam_t, mimicking the
    comments used for 'anchors', 'anchors_nr', and 'anchors_alloc'.

  - Revise commit log messages to reflect all of the above.

Michał Kępień (2):
  merge-base, xdiff: zero out xpparam_t structures
  diff: add -I<regex> that ignores matching changes

 Documentation/diff-options.txt |  5 ++++
 builtin/merge-tree.c           |  1 +
 diff.c                         | 28 ++++++++++++++++++++
 diff.h                         |  4 +++
 t/t4013-diff-various.sh        | 33 ++++++++++++++++++++++++
 xdiff/xdiff.h                  |  4 +++
 xdiff/xdiffi.c                 | 47 ++++++++++++++++++++++++++++++++--
 xdiff/xhistogram.c             |  2 ++
 xdiff/xpatience.c              |  2 ++
 9 files changed, 124 insertions(+), 2 deletions(-)

-- 
2.28.0


  parent reply	other threads:[~2020-10-15  7:24 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01 12:06 [PATCH " Michał Kępień
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   ` Michał Kępień [this message]
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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