Merge branch 'jh/dirstat' into maint
* jh/dirstat:
--dirstat: In case of renames, use target filename instead of source filename
Teach --dirstat not to completely ignore rearranged lines within a file
--dirstat-by-file: Make it faster and more correct
--dirstat: Describe non-obvious differences relative to --stat or regular diff
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index c93124b..7e4bd42 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -72,6 +72,10 @@
a cut-off percent (3% by default) are not shown. The cut-off percent
can be set with `--dirstat=<limit>`. Changes in a child directory are not
counted for the parent directory, unless `--cumulative` is used.
++
+Note that the `--dirstat` option computes the changes while ignoring
+the amount of pure code movements within a file. In other words,
+rearranging lines in a file is not counted as much as other changes.
--dirstat-by-file[=<limit>]::
Same as `--dirstat`, but counts changed files instead of lines.
diff --git a/diff.c b/diff.c
index 9fa8410..5376d01 100644
--- a/diff.c
+++ b/diff.c
@@ -1538,8 +1538,36 @@
struct diff_filepair *p = q->queue[i];
const char *name;
unsigned long copied, added, damage;
+ int content_changed;
- name = p->one->path ? p->one->path : p->two->path;
+ name = p->two->path ? p->two->path : p->one->path;
+
+ if (p->one->sha1_valid && p->two->sha1_valid)
+ content_changed = hashcmp(p->one->sha1, p->two->sha1);
+ else
+ content_changed = 1;
+
+ if (!content_changed) {
+ /*
+ * The SHA1 has not changed, so pre-/post-content is
+ * identical. We can therefore skip looking at the
+ * file contents altogether.
+ */
+ damage = 0;
+ goto found_damage;
+ }
+
+ if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE)) {
+ /*
+ * In --dirstat-by-file mode, we don't really need to
+ * look at the actual file contents at all.
+ * The fact that the SHA1 changed is enough for us to
+ * add this file to the list of results
+ * (with each file contributing equal damage).
+ */
+ damage = 1;
+ goto found_damage;
+ }
if (DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
diff_populate_filespec(p->one, 0);
@@ -1563,14 +1591,18 @@
/*
* Original minus copied is the removed material,
* added is the new material. They are both damages
- * made to the preimage. In --dirstat-by-file mode, count
- * damaged files, not damaged lines. This is done by
- * counting only a single damaged line per file.
+ * made to the preimage.
+ * If the resulting damage is zero, we know that
+ * diffcore_count_changes() considers the two entries to
+ * be identical, but since content_changed is true, we
+ * know that there must have been _some_ kind of change,
+ * so we force all entries to have damage > 0.
*/
damage = (p->one->size - copied) + added;
- if (DIFF_OPT_TST(options, DIRSTAT_BY_FILE) && damage > 0)
+ if (!damage)
damage = 1;
+found_damage:
ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc);
dir.files[dir.nr].name = name;
dir.files[dir.nr].changed = damage;
diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh
index 5daa0f2..93a6f20 100755
--- a/t/t4013-diff-various.sh
+++ b/t/t4013-diff-various.sh
@@ -80,18 +80,31 @@
git config log.showroot false &&
git commit --amend &&
+
+ GIT_AUTHOR_DATE="2006-06-26 00:06:00 +0000" &&
+ GIT_COMMITTER_DATE="2006-06-26 00:06:00 +0000" &&
+ export GIT_AUTHOR_DATE GIT_COMMITTER_DATE &&
+ git checkout -b rearrange initial &&
+ for i in B A; do echo $i; done >dir/sub &&
+ git add dir/sub &&
+ git commit -m "Rearranged lines in dir/sub" &&
+ git checkout master &&
+
git show-branch
'
: <<\EOF
! [initial] Initial
* [master] Merge branch 'side'
- ! [side] Side
----
- - [master] Merge branch 'side'
- *+ [side] Side
- * [master^] Second
-+*+ [initial] Initial
+ ! [rearrange] Rearranged lines in dir/sub
+ ! [side] Side
+----
+ + [rearrange] Rearranged lines in dir/sub
+ - [master] Merge branch 'side'
+ * + [side] Side
+ * [master^] Third
+ * [master~2] Second
++*++ [initial] Initial
EOF
V=`git version | sed -e 's/^git version //' -e 's/\./\\./g'`
@@ -287,6 +300,8 @@
diff --no-index dir dir3
diff master master^ side
diff --dirstat master~1 master~2
+diff --dirstat initial rearrange
+diff --dirstat-by-file initial rearrange
EOF
test_expect_success 'log -S requires an argument' '
diff --git a/t/t4013/diff.diff_--dirstat-by-file_initial_rearrange b/t/t4013/diff.diff_--dirstat-by-file_initial_rearrange
new file mode 100644
index 0000000..e48e33f
--- /dev/null
+++ b/t/t4013/diff.diff_--dirstat-by-file_initial_rearrange
@@ -0,0 +1,3 @@
+$ git diff --dirstat-by-file initial rearrange
+ 100.0% dir/
+$
diff --git a/t/t4013/diff.diff_--dirstat_initial_rearrange b/t/t4013/diff.diff_--dirstat_initial_rearrange
new file mode 100644
index 0000000..5fb02c1
--- /dev/null
+++ b/t/t4013/diff.diff_--dirstat_initial_rearrange
@@ -0,0 +1,3 @@
+$ git diff --dirstat initial rearrange
+ 100.0% dir/
+$
diff --git a/t/t4013/diff.format-patch_--stdout_--cover-letter_-n_initial..master^ b/t/t4013/diff.format-patch_--stdout_--cover-letter_-n_initial..master^
index 1f0f9ad..3b4e113 100644
--- a/t/t4013/diff.format-patch_--stdout_--cover-letter_-n_initial..master^
+++ b/t/t4013/diff.format-patch_--stdout_--cover-letter_-n_initial..master^
@@ -1,7 +1,7 @@
$ git format-patch --stdout --cover-letter -n initial..master^
From 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0 Mon Sep 17 00:00:00 2001
From: C O Mitter <committer@example.com>
-Date: Mon, 26 Jun 2006 00:05:00 +0000
+Date: Mon, 26 Jun 2006 00:06:00 +0000
Subject: [DIFFERENT_PREFIX 0/2] *** SUBJECT HERE ***
*** BLURB HERE ***
diff --git a/t/t4013/diff.log_--decorate=full_--all b/t/t4013/diff.log_--decorate=full_--all
index d155e0b..44d4525 100644
--- a/t/t4013/diff.log_--decorate=full_--all
+++ b/t/t4013/diff.log_--decorate=full_--all
@@ -1,4 +1,10 @@
$ git log --decorate=full --all
+commit cd4e72fd96faed3f0ba949dc42967430374e2290 (refs/heads/rearrange)
+Author: A U Thor <author@example.com>
+Date: Mon Jun 26 00:06:00 2006 +0000
+
+ Rearranged lines in dir/sub
+
commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (HEAD, refs/heads/master)
Merge: 9a6d494 c7a2ab9
Author: A U Thor <author@example.com>
diff --git a/t/t4013/diff.log_--decorate_--all b/t/t4013/diff.log_--decorate_--all
index fd7c3e6..27d3eab 100644
--- a/t/t4013/diff.log_--decorate_--all
+++ b/t/t4013/diff.log_--decorate_--all
@@ -1,4 +1,10 @@
$ git log --decorate --all
+commit cd4e72fd96faed3f0ba949dc42967430374e2290 (rearrange)
+Author: A U Thor <author@example.com>
+Date: Mon Jun 26 00:06:00 2006 +0000
+
+ Rearranged lines in dir/sub
+
commit 59d314ad6f356dd08601a4cd5e530381da3e3c64 (HEAD, master)
Merge: 9a6d494 c7a2ab9
Author: A U Thor <author@example.com>
