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diffcore-rename: properly honor the difference between -M and -C

We would allow rename detection to do copy detection even when asked
purely for renames.  That confuses users, but more importantly it can
terminally confuse the recursive merge rename logic.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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1 parent 11f944d commit 0940e5f211452ec2520d1b04233acddf0a872c06 @torvalds torvalds committed with gitster Feb 19, 2011
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@@ -278,6 +278,8 @@ static int find_identical_files(struct file_similarity *src,
}
/* Give higher scores to sources that haven't been used already */
score = !source->rename_used;
+ if (source->rename_used && options->detect_rename != DIFF_DETECT_COPY)
+ continue;
score += basename_same(source, target);
if (score > best_score) {
best = p;
@@ -416,6 +418,27 @@ static void record_if_better(struct diff_score m[], struct diff_score *o)
m[worst] = *o;
}
+static int find_renames(struct diff_score *mx, int dst_cnt, int minimum_score, int copies)
+{
+ int count = 0, i;
+
+ for (i = 0; i < dst_cnt * NUM_CANDIDATE_PER_DST; i++) {
+ struct diff_rename_dst *dst;
+
+ if ((mx[i].dst < 0) ||
+ (mx[i].score < minimum_score))
+ break; /* there is no more usable pair. */
+ dst = &rename_dst[mx[i].dst];
+ if (dst->pair)
+ continue; /* already done, either exact or fuzzy. */
+ if (!copies && rename_src[mx[i].src].one->rename_used)
+ continue;
+ record_rename_pair(mx[i].dst, mx[i].src, mx[i].score);
+ count++;
+ }
+ return count;
+}
+
void diffcore_rename(struct diff_options *options)
{
int detect_rename = options->detect_rename;
@@ -538,33 +561,9 @@ void diffcore_rename(struct diff_options *options)
/* cost matrix sorted by most to least similar pair */
qsort(mx, dst_cnt * NUM_CANDIDATE_PER_DST, sizeof(*mx), score_compare);
- for (i = 0; i < dst_cnt * NUM_CANDIDATE_PER_DST; i++) {
- struct diff_rename_dst *dst;
-
- if ((mx[i].dst < 0) ||
- (mx[i].score < minimum_score))
- break; /* there is no more usable pair. */
- dst = &rename_dst[mx[i].dst];
- if (dst->pair)
- continue; /* already done, either exact or fuzzy. */
- if (rename_src[mx[i].src].one->rename_used)
- continue;
- record_rename_pair(mx[i].dst, mx[i].src, mx[i].score);
- rename_count++;
- }
-
- for (i = 0; i < dst_cnt * NUM_CANDIDATE_PER_DST; i++) {
- struct diff_rename_dst *dst;
-
- if ((mx[i].dst < 0) ||
- (mx[i].score < minimum_score))
- break; /* there is no more usable pair. */
- dst = &rename_dst[mx[i].dst];
- if (dst->pair)
- continue; /* already done, either exact or fuzzy. */
- record_rename_pair(mx[i].dst, mx[i].src, mx[i].score);
- rename_count++;
- }
+ rename_count += find_renames(mx, dst_cnt, minimum_score, 0);
+ if (detect_rename == DIFF_DETECT_COPY)
+ rename_count += find_renames(mx, dst_cnt, minimum_score, 1);
free(mx);
cleanup:
@@ -29,7 +29,7 @@ test_expect_success \
# copy-and-edit one, and rename-and-edit the other. We do not say
# anything about rezrov.
-GIT_DIFF_OPTS=--unified=0 git diff-index -M -p $tree >current
+GIT_DIFF_OPTS=--unified=0 git diff-index -C -p $tree >current
cat >expected <<\EOF
diff --git a/COPYING b/COPYING.1
copy from COPYING
@@ -35,7 +35,7 @@ test_expect_success SYMLINKS \
# a new creation.
test_expect_success SYMLINKS 'setup diff output' "
- GIT_DIFF_OPTS=--unified=0 git diff-index -M -p $tree >current &&
+ GIT_DIFF_OPTS=--unified=0 git diff-index -C -p $tree >current &&
cat >expected <<\EOF
diff --git a/bozbar b/bozbar
new file mode 120000
@@ -29,7 +29,7 @@ test_expect_success \
# and COPYING.2 are based on COPYING, and do not say anything about
# rezrov.
-git diff-index -M $tree >current
+git diff-index -C $tree >current
cat >expected <<\EOF
:100644 100644 6ff87c4664981e4397625791c8ea3bbb5f2279a3 0603b3238a076dc6c8022aedc6648fa523a17178 C1234 COPYING COPYING.1
@@ -173,8 +173,8 @@ test_expect_success \
'compare_diff_raw expected current'
test_expect_success \
- 'run diff with -B -M' \
- 'git diff-index -B -M "$tree" >current'
+ 'run diff with -B -C' \
+ 'git diff-index -B -C "$tree" >current'
cat >expected <<\EOF
:100644 100644 f5deac7be59e7eeab8657fd9ae706fd6a57daed2 08bb2fb671deff4c03a4d4a0a1315dff98d5732c C095 file0 file1
@@ -29,7 +29,7 @@ test_expect_success \
# and COPYING.2 are based on COPYING, and do not say anything about
# rezrov.
-git diff-index -z -M $tree >current
+git diff-index -z -C $tree >current
cat >expected <<\EOF
:100644 100644 6ff87c4664981e4397625791c8ea3bbb5f2279a3 0603b3238a076dc6c8022aedc6648fa523a17178 C1234

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