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1 | /* | |
2 | * Copyright (C) 2005 Junio C Hamano | |
3 | */ | |
4 | #include "cache.h" | |
5 | #include "diff.h" | |
6 | #include "diffcore.h" | |
7 | #include "object-store.h" | |
8 | #include "hashmap.h" | |
9 | #include "progress.h" | |
10 | ||
11 | /* Table of rename/copy destinations */ | |
12 | ||
13 | static struct diff_rename_dst { | |
14 | struct diff_filespec *two; | |
15 | struct diff_filepair *pair; | |
16 | } *rename_dst; | |
17 | static int rename_dst_nr, rename_dst_alloc; | |
18 | ||
19 | static int find_rename_dst(struct diff_filespec *two) | |
20 | { | |
21 | int first, last; | |
22 | ||
23 | first = 0; | |
24 | last = rename_dst_nr; | |
25 | while (last > first) { | |
26 | int next = first + ((last - first) >> 1); | |
27 | struct diff_rename_dst *dst = &(rename_dst[next]); | |
28 | int cmp = strcmp(two->path, dst->two->path); | |
29 | if (!cmp) | |
30 | return next; | |
31 | if (cmp < 0) { | |
32 | last = next; | |
33 | continue; | |
34 | } | |
35 | first = next+1; | |
36 | } | |
37 | return -first - 1; | |
38 | } | |
39 | ||
40 | static struct diff_rename_dst *locate_rename_dst(struct diff_filespec *two) | |
41 | { | |
42 | int ofs = find_rename_dst(two); | |
43 | return ofs < 0 ? NULL : &rename_dst[ofs]; | |
44 | } | |
45 | ||
46 | /* | |
47 | * Returns 0 on success, -1 if we found a duplicate. | |
48 | */ | |
49 | static int add_rename_dst(struct diff_filespec *two) | |
50 | { | |
51 | int first = find_rename_dst(two); | |
52 | ||
53 | if (first >= 0) | |
54 | return -1; | |
55 | first = -first - 1; | |
56 | ||
57 | /* insert to make it at "first" */ | |
58 | ALLOC_GROW(rename_dst, rename_dst_nr + 1, rename_dst_alloc); | |
59 | rename_dst_nr++; | |
60 | if (first < rename_dst_nr) | |
61 | MOVE_ARRAY(rename_dst + first + 1, rename_dst + first, | |
62 | rename_dst_nr - first - 1); | |
63 | rename_dst[first].two = alloc_filespec(two->path); | |
64 | fill_filespec(rename_dst[first].two, &two->oid, two->oid_valid, | |
65 | two->mode); | |
66 | rename_dst[first].pair = NULL; | |
67 | return 0; | |
68 | } | |
69 | ||
70 | /* Table of rename/copy src files */ | |
71 | static struct diff_rename_src { | |
72 | struct diff_filepair *p; | |
73 | unsigned short score; /* to remember the break score */ | |
74 | } *rename_src; | |
75 | static int rename_src_nr, rename_src_alloc; | |
76 | ||
77 | static struct diff_rename_src *register_rename_src(struct diff_filepair *p) | |
78 | { | |
79 | int first, last; | |
80 | struct diff_filespec *one = p->one; | |
81 | unsigned short score = p->score; | |
82 | ||
83 | first = 0; | |
84 | last = rename_src_nr; | |
85 | while (last > first) { | |
86 | int next = first + ((last - first) >> 1); | |
87 | struct diff_rename_src *src = &(rename_src[next]); | |
88 | int cmp = strcmp(one->path, src->p->one->path); | |
89 | if (!cmp) | |
90 | return src; | |
91 | if (cmp < 0) { | |
92 | last = next; | |
93 | continue; | |
94 | } | |
95 | first = next+1; | |
96 | } | |
97 | ||
98 | /* insert to make it at "first" */ | |
99 | ALLOC_GROW(rename_src, rename_src_nr + 1, rename_src_alloc); | |
100 | rename_src_nr++; | |
101 | if (first < rename_src_nr) | |
102 | MOVE_ARRAY(rename_src + first + 1, rename_src + first, | |
103 | rename_src_nr - first - 1); | |
104 | rename_src[first].p = p; | |
105 | rename_src[first].score = score; | |
106 | return &(rename_src[first]); | |
107 | } | |
108 | ||
109 | static int basename_same(struct diff_filespec *src, struct diff_filespec *dst) | |
110 | { | |
111 | int src_len = strlen(src->path), dst_len = strlen(dst->path); | |
112 | while (src_len && dst_len) { | |
113 | char c1 = src->path[--src_len]; | |
114 | char c2 = dst->path[--dst_len]; | |
115 | if (c1 != c2) | |
116 | return 0; | |
117 | if (c1 == '/') | |
118 | return 1; | |
119 | } | |
120 | return (!src_len || src->path[src_len - 1] == '/') && | |
121 | (!dst_len || dst->path[dst_len - 1] == '/'); | |
122 | } | |
123 | ||
124 | struct diff_score { | |
125 | int src; /* index in rename_src */ | |
126 | int dst; /* index in rename_dst */ | |
127 | unsigned short score; | |
128 | short name_score; | |
129 | }; | |
130 | ||
131 | static int estimate_similarity(struct repository *r, | |
132 | struct diff_filespec *src, | |
133 | struct diff_filespec *dst, | |
134 | int minimum_score) | |
135 | { | |
136 | /* src points at a file that existed in the original tree (or | |
137 | * optionally a file in the destination tree) and dst points | |
138 | * at a newly created file. They may be quite similar, in which | |
139 | * case we want to say src is renamed to dst or src is copied into | |
140 | * dst, and then some edit has been applied to dst. | |
141 | * | |
142 | * Compare them and return how similar they are, representing | |
143 | * the score as an integer between 0 and MAX_SCORE. | |
144 | * | |
145 | * When there is an exact match, it is considered a better | |
146 | * match than anything else; the destination does not even | |
147 | * call into this function in that case. | |
148 | */ | |
149 | unsigned long max_size, delta_size, base_size, src_copied, literal_added; | |
150 | int score; | |
151 | ||
152 | /* We deal only with regular files. Symlink renames are handled | |
153 | * only when they are exact matches --- in other words, no edits | |
154 | * after renaming. | |
155 | */ | |
156 | if (!S_ISREG(src->mode) || !S_ISREG(dst->mode)) | |
157 | return 0; | |
158 | ||
159 | /* | |
160 | * Need to check that source and destination sizes are | |
161 | * filled in before comparing them. | |
162 | * | |
163 | * If we already have "cnt_data" filled in, we know it's | |
164 | * all good (avoid checking the size for zero, as that | |
165 | * is a possible size - we really should have a flag to | |
166 | * say whether the size is valid or not!) | |
167 | */ | |
168 | if (!src->cnt_data && | |
169 | diff_populate_filespec(r, src, CHECK_SIZE_ONLY)) | |
170 | return 0; | |
171 | if (!dst->cnt_data && | |
172 | diff_populate_filespec(r, dst, CHECK_SIZE_ONLY)) | |
173 | return 0; | |
174 | ||
175 | max_size = ((src->size > dst->size) ? src->size : dst->size); | |
176 | base_size = ((src->size < dst->size) ? src->size : dst->size); | |
177 | delta_size = max_size - base_size; | |
178 | ||
179 | /* We would not consider edits that change the file size so | |
180 | * drastically. delta_size must be smaller than | |
181 | * (MAX_SCORE-minimum_score)/MAX_SCORE * min(src->size, dst->size). | |
182 | * | |
183 | * Note that base_size == 0 case is handled here already | |
184 | * and the final score computation below would not have a | |
185 | * divide-by-zero issue. | |
186 | */ | |
187 | if (max_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE) | |
188 | return 0; | |
189 | ||
190 | if (!src->cnt_data && diff_populate_filespec(r, src, 0)) | |
191 | return 0; | |
192 | if (!dst->cnt_data && diff_populate_filespec(r, dst, 0)) | |
193 | return 0; | |
194 | ||
195 | if (diffcore_count_changes(r, src, dst, | |
196 | &src->cnt_data, &dst->cnt_data, | |
197 | &src_copied, &literal_added)) | |
198 | return 0; | |
199 | ||
200 | /* How similar are they? | |
201 | * what percentage of material in dst are from source? | |
202 | */ | |
203 | if (!dst->size) | |
204 | score = 0; /* should not happen */ | |
205 | else | |
206 | score = (int)(src_copied * MAX_SCORE / max_size); | |
207 | return score; | |
208 | } | |
209 | ||
210 | static void record_rename_pair(int dst_index, int src_index, int score) | |
211 | { | |
212 | struct diff_filespec *src, *dst; | |
213 | struct diff_filepair *dp; | |
214 | ||
215 | if (rename_dst[dst_index].pair) | |
216 | die("internal error: dst already matched."); | |
217 | ||
218 | src = rename_src[src_index].p->one; | |
219 | src->rename_used++; | |
220 | src->count++; | |
221 | ||
222 | dst = rename_dst[dst_index].two; | |
223 | dst->count++; | |
224 | ||
225 | dp = diff_queue(NULL, src, dst); | |
226 | dp->renamed_pair = 1; | |
227 | if (!strcmp(src->path, dst->path)) | |
228 | dp->score = rename_src[src_index].score; | |
229 | else | |
230 | dp->score = score; | |
231 | rename_dst[dst_index].pair = dp; | |
232 | } | |
233 | ||
234 | /* | |
235 | * We sort the rename similarity matrix with the score, in descending | |
236 | * order (the most similar first). | |
237 | */ | |
238 | static int score_compare(const void *a_, const void *b_) | |
239 | { | |
240 | const struct diff_score *a = a_, *b = b_; | |
241 | ||
242 | /* sink the unused ones to the bottom */ | |
243 | if (a->dst < 0) | |
244 | return (0 <= b->dst); | |
245 | else if (b->dst < 0) | |
246 | return -1; | |
247 | ||
248 | if (a->score == b->score) | |
249 | return b->name_score - a->name_score; | |
250 | ||
251 | return b->score - a->score; | |
252 | } | |
253 | ||
254 | struct file_similarity { | |
255 | struct hashmap_entry entry; | |
256 | int index; | |
257 | struct diff_filespec *filespec; | |
258 | }; | |
259 | ||
260 | static unsigned int hash_filespec(struct repository *r, | |
261 | struct diff_filespec *filespec) | |
262 | { | |
263 | if (!filespec->oid_valid) { | |
264 | if (diff_populate_filespec(r, filespec, 0)) | |
265 | return 0; | |
266 | hash_object_file(filespec->data, filespec->size, "blob", | |
267 | &filespec->oid); | |
268 | } | |
269 | return oidhash(&filespec->oid); | |
270 | } | |
271 | ||
272 | static int find_identical_files(struct hashmap *srcs, | |
273 | int dst_index, | |
274 | struct diff_options *options) | |
275 | { | |
276 | int renames = 0; | |
277 | ||
278 | struct diff_filespec *target = rename_dst[dst_index].two; | |
279 | struct file_similarity *p, *best = NULL; | |
280 | int i = 100, best_score = -1; | |
281 | ||
282 | /* | |
283 | * Find the best source match for specified destination. | |
284 | */ | |
285 | p = hashmap_get_from_hash(srcs, | |
286 | hash_filespec(options->repo, target), | |
287 | NULL); | |
288 | for (; p; p = hashmap_get_next(srcs, p)) { | |
289 | int score; | |
290 | struct diff_filespec *source = p->filespec; | |
291 | ||
292 | /* False hash collision? */ | |
293 | if (!oideq(&source->oid, &target->oid)) | |
294 | continue; | |
295 | /* Non-regular files? If so, the modes must match! */ | |
296 | if (!S_ISREG(source->mode) || !S_ISREG(target->mode)) { | |
297 | if (source->mode != target->mode) | |
298 | continue; | |
299 | } | |
300 | /* Give higher scores to sources that haven't been used already */ | |
301 | score = !source->rename_used; | |
302 | if (source->rename_used && options->detect_rename != DIFF_DETECT_COPY) | |
303 | continue; | |
304 | score += basename_same(source, target); | |
305 | if (score > best_score) { | |
306 | best = p; | |
307 | best_score = score; | |
308 | if (score == 2) | |
309 | break; | |
310 | } | |
311 | ||
312 | /* Too many identical alternatives? Pick one */ | |
313 | if (!--i) | |
314 | break; | |
315 | } | |
316 | if (best) { | |
317 | record_rename_pair(dst_index, best->index, MAX_SCORE); | |
318 | renames++; | |
319 | } | |
320 | return renames; | |
321 | } | |
322 | ||
323 | static void insert_file_table(struct repository *r, | |
324 | struct hashmap *table, int index, | |
325 | struct diff_filespec *filespec) | |
326 | { | |
327 | struct file_similarity *entry = xmalloc(sizeof(*entry)); | |
328 | ||
329 | entry->index = index; | |
330 | entry->filespec = filespec; | |
331 | ||
332 | hashmap_entry_init(entry, hash_filespec(r, filespec)); | |
333 | hashmap_add(table, entry); | |
334 | } | |
335 | ||
336 | /* | |
337 | * Find exact renames first. | |
338 | * | |
339 | * The first round matches up the up-to-date entries, | |
340 | * and then during the second round we try to match | |
341 | * cache-dirty entries as well. | |
342 | */ | |
343 | static int find_exact_renames(struct diff_options *options) | |
344 | { | |
345 | int i, renames = 0; | |
346 | struct hashmap file_table; | |
347 | ||
348 | /* Add all sources to the hash table in reverse order, because | |
349 | * later on they will be retrieved in LIFO order. | |
350 | */ | |
351 | hashmap_init(&file_table, NULL, NULL, rename_src_nr); | |
352 | for (i = rename_src_nr-1; i >= 0; i--) | |
353 | insert_file_table(options->repo, | |
354 | &file_table, i, | |
355 | rename_src[i].p->one); | |
356 | ||
357 | /* Walk the destinations and find best source match */ | |
358 | for (i = 0; i < rename_dst_nr; i++) | |
359 | renames += find_identical_files(&file_table, i, options); | |
360 | ||
361 | /* Free the hash data structure and entries */ | |
362 | hashmap_free(&file_table, 1); | |
363 | ||
364 | return renames; | |
365 | } | |
366 | ||
367 | #define NUM_CANDIDATE_PER_DST 4 | |
368 | static void record_if_better(struct diff_score m[], struct diff_score *o) | |
369 | { | |
370 | int i, worst; | |
371 | ||
372 | /* find the worst one */ | |
373 | worst = 0; | |
374 | for (i = 1; i < NUM_CANDIDATE_PER_DST; i++) | |
375 | if (score_compare(&m[i], &m[worst]) > 0) | |
376 | worst = i; | |
377 | ||
378 | /* is it better than the worst one? */ | |
379 | if (score_compare(&m[worst], o) > 0) | |
380 | m[worst] = *o; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Returns: | |
385 | * 0 if we are under the limit; | |
386 | * 1 if we need to disable inexact rename detection; | |
387 | * 2 if we would be under the limit if we were given -C instead of -C -C. | |
388 | */ | |
389 | static int too_many_rename_candidates(int num_create, | |
390 | struct diff_options *options) | |
391 | { | |
392 | int rename_limit = options->rename_limit; | |
393 | int num_src = rename_src_nr; | |
394 | int i; | |
395 | ||
396 | options->needed_rename_limit = 0; | |
397 | ||
398 | /* | |
399 | * This basically does a test for the rename matrix not | |
400 | * growing larger than a "rename_limit" square matrix, ie: | |
401 | * | |
402 | * num_create * num_src > rename_limit * rename_limit | |
403 | */ | |
404 | if (rename_limit <= 0) | |
405 | rename_limit = 32767; | |
406 | if ((num_create <= rename_limit || num_src <= rename_limit) && | |
407 | ((uint64_t)num_create * (uint64_t)num_src | |
408 | <= (uint64_t)rename_limit * (uint64_t)rename_limit)) | |
409 | return 0; | |
410 | ||
411 | options->needed_rename_limit = | |
412 | num_src > num_create ? num_src : num_create; | |
413 | ||
414 | /* Are we running under -C -C? */ | |
415 | if (!options->flags.find_copies_harder) | |
416 | return 1; | |
417 | ||
418 | /* Would we bust the limit if we were running under -C? */ | |
419 | for (num_src = i = 0; i < rename_src_nr; i++) { | |
420 | if (diff_unmodified_pair(rename_src[i].p)) | |
421 | continue; | |
422 | num_src++; | |
423 | } | |
424 | if ((num_create <= rename_limit || num_src <= rename_limit) && | |
425 | ((uint64_t)num_create * (uint64_t)num_src | |
426 | <= (uint64_t)rename_limit * (uint64_t)rename_limit)) | |
427 | return 2; | |
428 | return 1; | |
429 | } | |
430 | ||
431 | static int find_renames(struct diff_score *mx, int dst_cnt, int minimum_score, int copies) | |
432 | { | |
433 | int count = 0, i; | |
434 | ||
435 | for (i = 0; i < dst_cnt * NUM_CANDIDATE_PER_DST; i++) { | |
436 | struct diff_rename_dst *dst; | |
437 | ||
438 | if ((mx[i].dst < 0) || | |
439 | (mx[i].score < minimum_score)) | |
440 | break; /* there is no more usable pair. */ | |
441 | dst = &rename_dst[mx[i].dst]; | |
442 | if (dst->pair) | |
443 | continue; /* already done, either exact or fuzzy. */ | |
444 | if (!copies && rename_src[mx[i].src].p->one->rename_used) | |
445 | continue; | |
446 | record_rename_pair(mx[i].dst, mx[i].src, mx[i].score); | |
447 | count++; | |
448 | } | |
449 | return count; | |
450 | } | |
451 | ||
452 | void diffcore_rename(struct diff_options *options) | |
453 | { | |
454 | int detect_rename = options->detect_rename; | |
455 | int minimum_score = options->rename_score; | |
456 | struct diff_queue_struct *q = &diff_queued_diff; | |
457 | struct diff_queue_struct outq; | |
458 | struct diff_score *mx; | |
459 | int i, j, rename_count, skip_unmodified = 0; | |
460 | int num_create, dst_cnt; | |
461 | struct progress *progress = NULL; | |
462 | ||
463 | if (!minimum_score) | |
464 | minimum_score = DEFAULT_RENAME_SCORE; | |
465 | ||
466 | for (i = 0; i < q->nr; i++) { | |
467 | struct diff_filepair *p = q->queue[i]; | |
468 | if (!DIFF_FILE_VALID(p->one)) { | |
469 | if (!DIFF_FILE_VALID(p->two)) | |
470 | continue; /* unmerged */ | |
471 | else if (options->single_follow && | |
472 | strcmp(options->single_follow, p->two->path)) | |
473 | continue; /* not interested */ | |
474 | else if (!options->flags.rename_empty && | |
475 | is_empty_blob_oid(&p->two->oid)) | |
476 | continue; | |
477 | else if (add_rename_dst(p->two) < 0) { | |
478 | warning("skipping rename detection, detected" | |
479 | " duplicate destination '%s'", | |
480 | p->two->path); | |
481 | goto cleanup; | |
482 | } | |
483 | } | |
484 | else if (!options->flags.rename_empty && | |
485 | is_empty_blob_oid(&p->one->oid)) | |
486 | continue; | |
487 | else if (!DIFF_PAIR_UNMERGED(p) && !DIFF_FILE_VALID(p->two)) { | |
488 | /* | |
489 | * If the source is a broken "delete", and | |
490 | * they did not really want to get broken, | |
491 | * that means the source actually stays. | |
492 | * So we increment the "rename_used" score | |
493 | * by one, to indicate ourselves as a user | |
494 | */ | |
495 | if (p->broken_pair && !p->score) | |
496 | p->one->rename_used++; | |
497 | register_rename_src(p); | |
498 | } | |
499 | else if (detect_rename == DIFF_DETECT_COPY) { | |
500 | /* | |
501 | * Increment the "rename_used" score by | |
502 | * one, to indicate ourselves as a user. | |
503 | */ | |
504 | p->one->rename_used++; | |
505 | register_rename_src(p); | |
506 | } | |
507 | } | |
508 | if (rename_dst_nr == 0 || rename_src_nr == 0) | |
509 | goto cleanup; /* nothing to do */ | |
510 | ||
511 | /* | |
512 | * We really want to cull the candidates list early | |
513 | * with cheap tests in order to avoid doing deltas. | |
514 | */ | |
515 | rename_count = find_exact_renames(options); | |
516 | ||
517 | /* Did we only want exact renames? */ | |
518 | if (minimum_score == MAX_SCORE) | |
519 | goto cleanup; | |
520 | ||
521 | /* | |
522 | * Calculate how many renames are left (but all the source | |
523 | * files still remain as options for rename/copies!) | |
524 | */ | |
525 | num_create = (rename_dst_nr - rename_count); | |
526 | ||
527 | /* All done? */ | |
528 | if (!num_create) | |
529 | goto cleanup; | |
530 | ||
531 | switch (too_many_rename_candidates(num_create, options)) { | |
532 | case 1: | |
533 | goto cleanup; | |
534 | case 2: | |
535 | options->degraded_cc_to_c = 1; | |
536 | skip_unmodified = 1; | |
537 | break; | |
538 | default: | |
539 | break; | |
540 | } | |
541 | ||
542 | if (options->show_rename_progress) { | |
543 | progress = start_delayed_progress( | |
544 | _("Performing inexact rename detection"), | |
545 | (uint64_t)rename_dst_nr * (uint64_t)rename_src_nr); | |
546 | } | |
547 | ||
548 | mx = xcalloc(st_mult(NUM_CANDIDATE_PER_DST, num_create), sizeof(*mx)); | |
549 | for (dst_cnt = i = 0; i < rename_dst_nr; i++) { | |
550 | struct diff_filespec *two = rename_dst[i].two; | |
551 | struct diff_score *m; | |
552 | ||
553 | if (rename_dst[i].pair) | |
554 | continue; /* dealt with exact match already. */ | |
555 | ||
556 | m = &mx[dst_cnt * NUM_CANDIDATE_PER_DST]; | |
557 | for (j = 0; j < NUM_CANDIDATE_PER_DST; j++) | |
558 | m[j].dst = -1; | |
559 | ||
560 | for (j = 0; j < rename_src_nr; j++) { | |
561 | struct diff_filespec *one = rename_src[j].p->one; | |
562 | struct diff_score this_src; | |
563 | ||
564 | if (skip_unmodified && | |
565 | diff_unmodified_pair(rename_src[j].p)) | |
566 | continue; | |
567 | ||
568 | this_src.score = estimate_similarity(options->repo, | |
569 | one, two, | |
570 | minimum_score); | |
571 | this_src.name_score = basename_same(one, two); | |
572 | this_src.dst = i; | |
573 | this_src.src = j; | |
574 | record_if_better(m, &this_src); | |
575 | /* | |
576 | * Once we run estimate_similarity, | |
577 | * We do not need the text anymore. | |
578 | */ | |
579 | diff_free_filespec_blob(one); | |
580 | diff_free_filespec_blob(two); | |
581 | } | |
582 | dst_cnt++; | |
583 | display_progress(progress, (uint64_t)(i+1)*(uint64_t)rename_src_nr); | |
584 | } | |
585 | stop_progress(&progress); | |
586 | ||
587 | /* cost matrix sorted by most to least similar pair */ | |
588 | QSORT(mx, dst_cnt * NUM_CANDIDATE_PER_DST, score_compare); | |
589 | ||
590 | rename_count += find_renames(mx, dst_cnt, minimum_score, 0); | |
591 | if (detect_rename == DIFF_DETECT_COPY) | |
592 | rename_count += find_renames(mx, dst_cnt, minimum_score, 1); | |
593 | free(mx); | |
594 | ||
595 | cleanup: | |
596 | /* At this point, we have found some renames and copies and they | |
597 | * are recorded in rename_dst. The original list is still in *q. | |
598 | */ | |
599 | DIFF_QUEUE_CLEAR(&outq); | |
600 | for (i = 0; i < q->nr; i++) { | |
601 | struct diff_filepair *p = q->queue[i]; | |
602 | struct diff_filepair *pair_to_free = NULL; | |
603 | ||
604 | if (DIFF_PAIR_UNMERGED(p)) { | |
605 | diff_q(&outq, p); | |
606 | } | |
607 | else if (!DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) { | |
608 | /* | |
609 | * Creation | |
610 | * | |
611 | * We would output this create record if it has | |
612 | * not been turned into a rename/copy already. | |
613 | */ | |
614 | struct diff_rename_dst *dst = locate_rename_dst(p->two); | |
615 | if (dst && dst->pair) { | |
616 | diff_q(&outq, dst->pair); | |
617 | pair_to_free = p; | |
618 | } | |
619 | else | |
620 | /* no matching rename/copy source, so | |
621 | * record this as a creation. | |
622 | */ | |
623 | diff_q(&outq, p); | |
624 | } | |
625 | else if (DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two)) { | |
626 | /* | |
627 | * Deletion | |
628 | * | |
629 | * We would output this delete record if: | |
630 | * | |
631 | * (1) this is a broken delete and the counterpart | |
632 | * broken create remains in the output; or | |
633 | * (2) this is not a broken delete, and rename_dst | |
634 | * does not have a rename/copy to move p->one->path | |
635 | * out of existence. | |
636 | * | |
637 | * Otherwise, the counterpart broken create | |
638 | * has been turned into a rename-edit; or | |
639 | * delete did not have a matching create to | |
640 | * begin with. | |
641 | */ | |
642 | if (DIFF_PAIR_BROKEN(p)) { | |
643 | /* broken delete */ | |
644 | struct diff_rename_dst *dst = locate_rename_dst(p->one); | |
645 | if (dst && dst->pair) | |
646 | /* counterpart is now rename/copy */ | |
647 | pair_to_free = p; | |
648 | } | |
649 | else { | |
650 | if (p->one->rename_used) | |
651 | /* this path remains */ | |
652 | pair_to_free = p; | |
653 | } | |
654 | ||
655 | if (pair_to_free) | |
656 | ; | |
657 | else | |
658 | diff_q(&outq, p); | |
659 | } | |
660 | else if (!diff_unmodified_pair(p)) | |
661 | /* all the usual ones need to be kept */ | |
662 | diff_q(&outq, p); | |
663 | else | |
664 | /* no need to keep unmodified pairs */ | |
665 | pair_to_free = p; | |
666 | ||
667 | if (pair_to_free) | |
668 | diff_free_filepair(pair_to_free); | |
669 | } | |
670 | diff_debug_queue("done copying original", &outq); | |
671 | ||
672 | free(q->queue); | |
673 | *q = outq; | |
674 | diff_debug_queue("done collapsing", q); | |
675 | ||
676 | for (i = 0; i < rename_dst_nr; i++) | |
677 | free_filespec(rename_dst[i].two); | |
678 | ||
679 | FREE_AND_NULL(rename_dst); | |
680 | rename_dst_nr = rename_dst_alloc = 0; | |
681 | FREE_AND_NULL(rename_src); | |
682 | rename_src_nr = rename_src_alloc = 0; | |
683 | return; | |
684 | } |