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Michał Kępień 296d4a94e7 diff: add -I<regex> that ignores matching changes
Add 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.

Use the 'ignore' field of xdchange_t for marking a change as ignored or
not.  Since the same field is used by --ignore-blank-lines, identical
hunk emitting rules apply for --ignore-blank-lines and -I.  These two
options can also be used together in the same git invocation (they are
complementary to each other).

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".

Signed-off-by: Michał Kępień <michal@isc.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-10-20 12:53:26 -07:00

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$ git log -IA -IB -I1 -I2 -p master
commit 59d314ad6f356dd08601a4cd5e530381da3e3c64
Merge: 9a6d494 c7a2ab9
Author: A U Thor <author@example.com>
Date: Mon Jun 26 00:04:00 2006 +0000
Merge branch 'side'
commit c7a2ab9e8eac7b117442a607d5a9b3950ae34d5a
Author: A U Thor <author@example.com>
Date: Mon Jun 26 00:03:00 2006 +0000
Side
diff --git a/file0 b/file0
index 01e79c3..f4615da 100644
--- a/file0
+++ b/file0
@@ -1,3 +1,6 @@
1
2
3
+A
+B
+C
diff --git a/file3 b/file3
new file mode 100644
index 0000000..7289e35
commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
Author: A U Thor <author@example.com>
Date: Mon Jun 26 00:02:00 2006 +0000
Third
diff --git a/dir/sub b/dir/sub
index 8422d40..cead32e 100644
--- a/dir/sub
+++ b/dir/sub
@@ -2,3 +2,5 @@ A
B
C
D
+E
+F
diff --git a/file1 b/file1
new file mode 100644
index 0000000..b1e6722
--- /dev/null
+++ b/file1
@@ -0,0 +1,3 @@
+A
+B
+C
commit 1bde4ae5f36c8d9abe3a0fce0c6aab3c4a12fe44
Author: A U Thor <author@example.com>
Date: Mon Jun 26 00:01:00 2006 +0000
Second
This is the second commit.
diff --git a/dir/sub b/dir/sub
index 35d242b..8422d40 100644
--- a/dir/sub
+++ b/dir/sub
@@ -1,2 +1,4 @@
A
B
+C
+D
diff --git a/file0 b/file0
index 01e79c3..b414108 100644
--- a/file0
+++ b/file0
@@ -1,3 +1,6 @@
1
2
3
+4
+5
+6
diff --git a/file2 b/file2
deleted file mode 100644
index 01e79c3..0000000
--- a/file2
+++ /dev/null
@@ -1,3 +0,0 @@
-1
-2
-3
commit 444ac553ac7612cc88969031b02b3767fb8a353a
Author: A U Thor <author@example.com>
Date: Mon Jun 26 00:00:00 2006 +0000
Initial
$