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diff --git a/diffcore-rename.c b/diffcore-rename.c
index 31941bcbbf457fe02097f8c46d25f1f9fc7c4f9f..63ac998bfaf64da807bec0ae0bd57c391fb651fe 100644 (file)
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
struct diff_score {
int src; /* index in rename_src */
int dst; /* index in rename_dst */
- int score;
- int name_score;
+ unsigned short score;
+ short name_score;
};
static int estimate_similarity(struct diff_filespec *src,
* is a possible size - we really should have a flag to
* say whether the size is valid or not!)
*/
- if (!src->cnt_data && diff_populate_filespec(src, 0))
+ if (!src->cnt_data && diff_populate_filespec(src, 1))
return 0;
- if (!dst->cnt_data && diff_populate_filespec(dst, 0))
+ if (!dst->cnt_data && diff_populate_filespec(dst, 1))
return 0;
max_size = ((src->size > dst->size) ? src->size : dst->size);
if (base_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE)
return 0;
+ if (!src->cnt_data && diff_populate_filespec(src, 0))
+ return 0;
+ if (!dst->cnt_data && diff_populate_filespec(dst, 0))
+ return 0;
+
delta_limit = (unsigned long)
(base_size * (MAX_SCORE-minimum_score) / MAX_SCORE);
if (diffcore_count_changes(src, dst,
{
const struct diff_score *a = a_, *b = b_;
+ /* sink the unused ones to the bottom */
+ if (a->dst < 0)
+ return (0 <= b->dst);
+ else if (b->dst < 0)
+ return -1;
+
if (a->score == b->score)
return b->name_score - a->name_score;
int score;
struct diff_filespec *source = p->filespec;
- /* False hash collission? */
+ /* False hash collision? */
if (hashcmp(source->sha1, target->sha1))
continue;
/* Non-regular files? If so, the modes must match! */
return i;
}
+#define NUM_CANDIDATE_PER_DST 4
+static void record_if_better(struct diff_score m[], struct diff_score *o)
+{
+ int i, worst;
+
+ /* find the worst one */
+ worst = 0;
+ for (i = 1; i < NUM_CANDIDATE_PER_DST; i++)
+ if (score_compare(&m[i], &m[worst]) > 0)
+ worst = i;
+
+ /* is it better than the worst one? */
+ if (score_compare(&m[worst], o) > 0)
+ m[worst] = *o;
+}
+
void diffcore_rename(struct diff_options *options)
{
int detect_rename = options->detect_rename;
rename_limit = 32767;
if ((num_create > rename_limit && num_src > rename_limit) ||
(num_create * num_src > rename_limit * rename_limit)) {
- warning("too many files, skipping inexact rename detection");
+ if (options->warn_on_too_large_rename)
+ warning("too many files (created: %d deleted: %d), skipping inexact rename detection", num_create, num_src);
goto cleanup;
}
- mx = xmalloc(sizeof(*mx) * num_create * num_src);
+ mx = xcalloc(num_create * NUM_CANDIDATE_PER_DST, sizeof(*mx));
for (dst_cnt = i = 0; i < rename_dst_nr; i++) {
- int base = dst_cnt * num_src;
struct diff_filespec *two = rename_dst[i].two;
+ struct diff_score *m;
+
if (rename_dst[i].pair)
continue; /* dealt with exact match already. */
+
+ m = &mx[dst_cnt * NUM_CANDIDATE_PER_DST];
+ for (j = 0; j < NUM_CANDIDATE_PER_DST; j++)
+ m[j].dst = -1;
+
for (j = 0; j < rename_src_nr; j++) {
struct diff_filespec *one = rename_src[j].one;
- struct diff_score *m = &mx[base+j];
- m->src = j;
- m->dst = i;
- m->score = estimate_similarity(one, two,
- minimum_score);
- m->name_score = basename_same(one, two);
+ struct diff_score this_src;
+ this_src.score = estimate_similarity(one, two,
+ minimum_score);
+ this_src.name_score = basename_same(one, two);
+ this_src.dst = i;
+ this_src.src = j;
+ record_if_better(m, &this_src);
diff_free_filespec_blob(one);
}
/* We do not need the text anymore */
diff_free_filespec_blob(two);
dst_cnt++;
}
+
/* cost matrix sorted by most to least similar pair */
- qsort(mx, num_create * num_src, sizeof(*mx), score_compare);
- for (i = 0; i < num_create * num_src; i++) {
- struct diff_rename_dst *dst = &rename_dst[mx[i].dst];
- struct diff_filespec *src;
+ 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 (mx[i].score < minimum_score)
- break; /* there is no more usable pair. */
- src = rename_src[mx[i].src].one;
- if (src->rename_used)
+ 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 < num_create * num_src; i++) {
- struct diff_rename_dst *dst = &rename_dst[mx[i].dst];
+
+ 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 (mx[i].score < minimum_score)
- break; /* there is no more usable pair. */
record_rename_pair(mx[i].dst, mx[i].src, mx[i].score);
rename_count++;
}