summaryrefslogtreecommitdiff
path: root/diff.c
diff options
context:
space:
mode:
authorJunio C Hamano <gitster@pobox.com>2007-08-03 20:33:31 (GMT)
committerJunio C Hamano <gitster@pobox.com>2007-08-14 08:55:00 (GMT)
commitfb13227e089f22dc31a3b1624559153821056848 (patch)
treea183d18dca83a2214c6d8cf69f0369f461a83fcb /diff.c
parent180787c48f21c40a047ae3ee5432821d7e033e44 (diff)
downloadgit-fb13227e089f22dc31a3b1624559153821056848.zip
git-fb13227e089f22dc31a3b1624559153821056848.tar.gz
git-fb13227e089f22dc31a3b1624559153821056848.tar.bz2
git-diff: squelch "empty" diffs
After starting to edit a working tree file but later when your edit ends up identical to the original (this can also happen when you ran a wholesale regexp replace with something like "perl -i" that does not actually modify many of the paths), "git diff" between the index and the working tree outputs many "empty" diffs that show "diff --git" headers and nothing else, because these paths are stat-dirty. While it was a way to warn the user that the earlier action of the user made the index ineffective as an optimization mechanism, it was felt too loud for the purpose of warning even to experienced users, and also resulted in confusing people new to git. This replaces the "empty" diffs with a single warning message at the end. Having many such paths hurts performance, and you can run "git-update-index --refresh" to update the lstat(2) information recorded in the index in such a case. "git-status" does so as a side effect, and that is more familiar to the end-user, so we recommend it to them. The change affects only "git diff" that outputs patch text, because that is where the annoyance of too many "empty" diff is most strongly felt, and because the warning message can be safely ignored by downstream tools without getting mistaken as part of the patch. For the low-level "git diff-files" and "git diff-index", the traditional behaviour is retained. Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'diff.c')
-rw-r--r--diff.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/diff.c b/diff.c
index a5fc56b..f884de7 100644
--- a/diff.c
+++ b/diff.c
@@ -3143,11 +3143,63 @@ static void diffcore_apply_filter(const char *filter)
*q = outq;
}
+static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
+{
+ int i;
+ struct diff_queue_struct *q = &diff_queued_diff;
+ struct diff_queue_struct outq;
+ outq.queue = NULL;
+ outq.nr = outq.alloc = 0;
+
+ for (i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+
+ /*
+ * 1. Entries that come from stat info dirtyness
+ * always have both sides (iow, not create/delete),
+ * one side of the object name is unknown, with
+ * the same mode and size. Keep the ones that
+ * do not match these criteria. They have real
+ * differences.
+ *
+ * 2. At this point, the file is known to be modified,
+ * with the same mode and size, and the object
+ * name of one side is unknown. Need to inspect
+ * the identical contents.
+ */
+ if (!DIFF_FILE_VALID(p->one) || /* (1) */
+ !DIFF_FILE_VALID(p->two) ||
+ (p->one->sha1_valid && p->two->sha1_valid) ||
+ (p->one->mode != p->two->mode) ||
+ diff_populate_filespec(p->one, 1) ||
+ diff_populate_filespec(p->two, 1) ||
+ (p->one->size != p->two->size) ||
+
+ diff_populate_filespec(p->one, 0) || /* (2) */
+ diff_populate_filespec(p->two, 0) ||
+ memcmp(p->one->data, p->two->data, p->one->size))
+ diff_q(&outq, p);
+ else {
+ /*
+ * The caller can subtract 1 from skip_stat_unmatch
+ * to determine how many paths were dirty only
+ * due to stat info mismatch.
+ */
+ diffopt->skip_stat_unmatch++;
+ diff_free_filepair(p);
+ }
+ }
+ free(q->queue);
+ *q = outq;
+}
+
void diffcore_std(struct diff_options *options)
{
if (options->quiet)
return;
+ if (options->skip_stat_unmatch && !options->find_copies_harder)
+ diffcore_skip_stat_unmatch(options);
if (options->break_opt != -1)
diffcore_break(options->break_opt);
if (options->detect_rename)