diff options
| -rw-r--r-- | Documentation/diff-options.txt | 4 | ||||
| -rw-r--r-- | diff.c | 19 | ||||
| -rwxr-xr-x | t/t4013-diff-various.sh | 2 | ||||
| -rw-r--r-- | t/t4013/diff.diff_--dirstat_initial_rearrange | 1 |
4 files changed, 21 insertions, 5 deletions
diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt index 23772d615d..7e4bd425e1 100644 --- a/Documentation/diff-options.txt +++ b/Documentation/diff-options.txt @@ -74,8 +74,8 @@ endif::git-format-patch[] counted for the parent directory, unless `--cumulative` is used. + Note that the `--dirstat` option computes the changes while ignoring -pure code movements within a file. In other words, rearranging lines -in a file is not counted as a change. +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. @@ -1548,6 +1548,16 @@ static void show_dirstat(struct diff_options *options) 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 @@ -1556,7 +1566,7 @@ static void show_dirstat(struct diff_options *options) * add this file to the list of results * (with each file contributing equal damage). */ - damage = content_changed ? 1 : 0; + damage = 1; goto found_damage; } @@ -1583,8 +1593,15 @@ static void show_dirstat(struct diff_options *options) * Original minus copied is the removed material, * added is the new material. They are both damages * 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 (!damage) + damage = 1; found_damage: ALLOC_GROW(dir.files, dir.nr + 1, dir.alloc); diff --git a/t/t4013-diff-various.sh b/t/t4013-diff-various.sh index 6428a905ab..93a6f20871 100755 --- a/t/t4013-diff-various.sh +++ b/t/t4013-diff-various.sh @@ -300,9 +300,7 @@ diff --no-index --name-status -- dir2 dir diff --no-index dir dir3 diff master master^ side diff --dirstat master~1 master~2 -# --dirstat doesn't notice changes that simply rearrange existing lines diff --dirstat initial rearrange -# ...but --dirstat-by-file does notice changes that only rearrange lines diff --dirstat-by-file initial rearrange EOF diff --git a/t/t4013/diff.diff_--dirstat_initial_rearrange b/t/t4013/diff.diff_--dirstat_initial_rearrange index fb2e17dd2e..5fb02c13bc 100644 --- a/t/t4013/diff.diff_--dirstat_initial_rearrange +++ b/t/t4013/diff.diff_--dirstat_initial_rearrange @@ -1,2 +1,3 @@ $ git diff --dirstat initial rearrange + 100.0% dir/ $ |