#include "diff.h"
#include "diffcore.h"
#include "hash.h"
+#include "progress.h"
/* Table of rename/copy destinations */
/* Table of rename/copy src files */
static struct diff_rename_src {
- struct diff_filespec *one;
+ struct diff_filepair *p;
unsigned short score; /* to remember the break score */
} *rename_src;
static int rename_src_nr, rename_src_alloc;
-static struct diff_rename_src *register_rename_src(struct diff_filespec *one,
- unsigned short score)
+static struct diff_rename_src *register_rename_src(struct diff_filepair *p)
{
int first, last;
+ struct diff_filespec *one = p->one;
+ unsigned short score = p->score;
first = 0;
last = rename_src_nr;
while (last > first) {
int next = (last + first) >> 1;
struct diff_rename_src *src = &(rename_src[next]);
- int cmp = strcmp(one->path, src->one->path);
+ int cmp = strcmp(one->path, src->p->one->path);
if (!cmp)
return src;
if (cmp < 0) {
if (first < rename_src_nr)
memmove(rename_src + first + 1, rename_src + first,
(rename_src_nr - first - 1) * sizeof(*rename_src));
- rename_src[first].one = one;
+ rename_src[first].p = p;
rename_src[first].score = score;
return &(rename_src[first]);
}
* and the final score computation below would not have a
* divide-by-zero issue.
*/
- if (base_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE)
+ if (max_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE)
return 0;
if (!src->cnt_data && diff_populate_filespec(src, 0))
if (rename_dst[dst_index].pair)
die("internal error: dst already matched.");
- src = rename_src[src_index].one;
+ src = rename_src[src_index].p->one;
src->rename_used++;
src->count++;
};
static int find_identical_files(struct file_similarity *src,
- struct file_similarity *dst)
+ struct file_similarity *dst,
+ struct diff_options *options)
{
int renames = 0;
}
/* 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;
}
}
-static int find_same_files(void *ptr)
+static int find_same_files(void *ptr, void *data)
{
int ret;
struct file_similarity *p = ptr;
struct file_similarity *src = NULL, *dst = NULL;
+ struct diff_options *options = data;
/* Split the hash list up into sources and destinations */
do {
* If we have both sources *and* destinations, see if
* we can match them up
*/
- ret = (src && dst) ? find_identical_files(src, dst) : 0;
+ ret = (src && dst) ? find_identical_files(src, dst, options) : 0;
/* Free the hashes and return the number of renames found */
free_similarity_list(src);
* and then during the second round we try to match
* cache-dirty entries as well.
*/
-static int find_exact_renames(void)
+static int find_exact_renames(struct diff_options *options)
{
int i;
struct hash_table file_table;
init_hash(&file_table);
for (i = 0; i < rename_src_nr; i++)
- insert_file_table(&file_table, -1, i, rename_src[i].one);
+ insert_file_table(&file_table, -1, i, rename_src[i].p->one);
for (i = 0; i < rename_dst_nr; i++)
insert_file_table(&file_table, 1, i, rename_dst[i].two);
/* Find the renames */
- i = for_each_hash(&file_table, find_same_files);
+ i = for_each_hash(&file_table, find_same_files, options);
/* .. and free the hash data structure */
free_hash(&file_table);
m[worst] = *o;
}
+/*
+ * Returns:
+ * 0 if we are under the limit;
+ * 1 if we need to disable inexact rename detection;
+ * 2 if we would be under the limit if we were given -C instead of -C -C.
+ */
+static int too_many_rename_candidates(int num_create,
+ struct diff_options *options)
+{
+ int rename_limit = options->rename_limit;
+ int num_src = rename_src_nr;
+ int i;
+
+ options->needed_rename_limit = 0;
+
+ /*
+ * This basically does a test for the rename matrix not
+ * growing larger than a "rename_limit" square matrix, ie:
+ *
+ * num_create * num_src > rename_limit * rename_limit
+ *
+ * but handles the potential overflow case specially (and we
+ * assume at least 32-bit integers)
+ */
+ if (rename_limit <= 0 || rename_limit > 32767)
+ rename_limit = 32767;
+ if ((num_create <= rename_limit || num_src <= rename_limit) &&
+ (num_create * num_src <= rename_limit * rename_limit))
+ return 0;
+
+ options->needed_rename_limit =
+ num_src > num_create ? num_src : num_create;
+
+ /* Are we running under -C -C? */
+ if (!DIFF_OPT_TST(options, FIND_COPIES_HARDER))
+ return 1;
+
+ /* Would we bust the limit if we were running under -C? */
+ for (num_src = i = 0; i < rename_src_nr; i++) {
+ if (diff_unmodified_pair(rename_src[i].p))
+ continue;
+ num_src++;
+ }
+ if ((num_create <= rename_limit || num_src <= rename_limit) &&
+ (num_create * num_src <= rename_limit * rename_limit))
+ return 2;
+ return 1;
+}
+
+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].p->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;
int minimum_score = options->rename_score;
- int rename_limit = options->rename_limit;
struct diff_queue_struct *q = &diff_queued_diff;
struct diff_queue_struct outq;
struct diff_score *mx;
- int i, j, rename_count;
- int num_create, num_src, dst_cnt;
+ int i, j, rename_count, skip_unmodified = 0;
+ int num_create, dst_cnt;
+ struct progress *progress = NULL;
if (!minimum_score)
minimum_score = DEFAULT_RENAME_SCORE;
else if (options->single_follow &&
strcmp(options->single_follow, p->two->path))
continue; /* not interested */
+ else if (!DIFF_OPT_TST(options, RENAME_EMPTY) &&
+ is_empty_blob_sha1(p->two->sha1))
+ continue;
else
locate_rename_dst(p->two, 1);
}
- else if (!DIFF_FILE_VALID(p->two)) {
+ else if (!DIFF_OPT_TST(options, RENAME_EMPTY) &&
+ is_empty_blob_sha1(p->one->sha1))
+ continue;
+ else if (!DIFF_PAIR_UNMERGED(p) && !DIFF_FILE_VALID(p->two)) {
/*
* If the source is a broken "delete", and
* they did not really want to get broken,
*/
if (p->broken_pair && !p->score)
p->one->rename_used++;
- register_rename_src(p->one, p->score);
+ register_rename_src(p);
}
else if (detect_rename == DIFF_DETECT_COPY) {
/*
* one, to indicate ourselves as a user.
*/
p->one->rename_used++;
- register_rename_src(p->one, p->score);
+ register_rename_src(p);
}
}
if (rename_dst_nr == 0 || rename_src_nr == 0)
* We really want to cull the candidates list early
* with cheap tests in order to avoid doing deltas.
*/
- rename_count = find_exact_renames();
+ rename_count = find_exact_renames(options);
/* Did we only want exact renames? */
if (minimum_score == MAX_SCORE)
* files still remain as options for rename/copies!)
*/
num_create = (rename_dst_nr - rename_count);
- num_src = rename_src_nr;
/* All done? */
if (!num_create)
goto cleanup;
- /*
- * This basically does a test for the rename matrix not
- * growing larger than a "rename_limit" square matrix, ie:
- *
- * num_create * num_src > rename_limit * rename_limit
- *
- * but handles the potential overflow case specially (and we
- * assume at least 32-bit integers)
- */
- if (rename_limit <= 0 || rename_limit > 32767)
- rename_limit = 32767;
- if ((num_create > rename_limit && num_src > rename_limit) ||
- (num_create * num_src > rename_limit * rename_limit)) {
- if (options->warn_on_too_large_rename)
- warning("too many files (created: %d deleted: %d), skipping inexact rename detection", num_create, num_src);
+ switch (too_many_rename_candidates(num_create, options)) {
+ case 1:
goto cleanup;
+ case 2:
+ options->degraded_cc_to_c = 1;
+ skip_unmodified = 1;
+ break;
+ default:
+ break;
+ }
+
+ if (options->show_rename_progress) {
+ progress = start_progress_delay(
+ "Performing inexact rename detection",
+ rename_dst_nr * rename_src_nr, 50, 1);
}
mx = xcalloc(num_create * NUM_CANDIDATE_PER_DST, sizeof(*mx));
m[j].dst = -1;
for (j = 0; j < rename_src_nr; j++) {
- struct diff_filespec *one = rename_src[j].one;
+ struct diff_filespec *one = rename_src[j].p->one;
struct diff_score this_src;
+
+ if (skip_unmodified &&
+ diff_unmodified_pair(rename_src[j].p))
+ continue;
+
this_src.score = estimate_similarity(one, two,
minimum_score);
this_src.name_score = basename_same(one, two);
diff_free_filespec_blob(two);
}
dst_cnt++;
+ display_progress(progress, (i+1)*rename_src_nr);
}
+ stop_progress(&progress);
/* 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:
/* At this point, we have found some renames and copies and they
* are recorded in rename_dst. The original list is still in *q.
*/
- outq.queue = NULL;
- outq.nr = outq.alloc = 0;
+ DIFF_QUEUE_CLEAR(&outq);
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
struct diff_filepair *pair_to_free = NULL;
- if (!DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
+ if (DIFF_PAIR_UNMERGED(p)) {
+ diff_q(&outq, p);
+ }
+ else if (!DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
/*
* Creation
*