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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 "hashmap.h" | |
8 | #include "progress.h" | |
9 | ||
10 | /* Table of rename/copy destinations */ | |
11 | ||
12 | static struct diff_rename_dst { | |
13 | struct diff_filespec *two; | |
14 | struct diff_filepair *pair; | |
15 | } *rename_dst; | |
16 | static int rename_dst_nr, rename_dst_alloc; | |
17 | ||
18 | static int find_rename_dst(struct diff_filespec *two) | |
19 | { | |
20 | int first, last; | |
21 | ||
22 | first = 0; | |
23 | last = rename_dst_nr; | |
24 | while (last > first) { | |
25 | int next = (last + first) >> 1; | |
26 | struct diff_rename_dst *dst = &(rename_dst[next]); | |
27 | int cmp = strcmp(two->path, dst->two->path); | |
28 | if (!cmp) | |
29 | return next; | |
30 | if (cmp < 0) { | |
31 | last = next; | |
32 | continue; | |
33 | } | |
34 | first = next+1; | |
35 | } | |
36 | return -first - 1; | |
37 | } | |
38 | ||
39 | static struct diff_rename_dst *locate_rename_dst(struct diff_filespec *two) | |
40 | { | |
41 | int ofs = find_rename_dst(two); | |
42 | return ofs < 0 ? NULL : &rename_dst[ofs]; | |
43 | } | |
44 | ||
45 | /* | |
46 | * Returns 0 on success, -1 if we found a duplicate. | |
47 | */ | |
48 | static int add_rename_dst(struct diff_filespec *two) | |
49 | { | |
50 | int first = find_rename_dst(two); | |
51 | ||
52 | if (first >= 0) | |
53 | return -1; | |
54 | first = -first - 1; | |
55 | ||
56 | /* insert to make it at "first" */ | |
57 | ALLOC_GROW(rename_dst, rename_dst_nr + 1, rename_dst_alloc); | |
58 | rename_dst_nr++; | |
59 | if (first < rename_dst_nr) | |
60 | memmove(rename_dst + first + 1, rename_dst + first, | |
61 | (rename_dst_nr - first - 1) * sizeof(*rename_dst)); | |
62 | rename_dst[first].two = alloc_filespec(two->path); | |
63 | fill_filespec(rename_dst[first].two, two->sha1, two->sha1_valid, two->mode); | |
64 | rename_dst[first].pair = NULL; | |
65 | return 0; | |
66 | } | |
67 | ||
68 | /* Table of rename/copy src files */ | |
69 | static struct diff_rename_src { | |
70 | struct diff_filepair *p; | |
71 | unsigned short score; /* to remember the break score */ | |
72 | } *rename_src; | |
73 | static int rename_src_nr, rename_src_alloc; | |
74 | ||
75 | static struct diff_rename_src *register_rename_src(struct diff_filepair *p) | |
76 | { | |
77 | int first, last; | |
78 | struct diff_filespec *one = p->one; | |
79 | unsigned short score = p->score; | |
80 | ||
81 | first = 0; | |
82 | last = rename_src_nr; | |
83 | while (last > first) { | |
84 | int next = (last + first) >> 1; | |
85 | struct diff_rename_src *src = &(rename_src[next]); | |
86 | int cmp = strcmp(one->path, src->p->one->path); | |
87 | if (!cmp) | |
88 | return src; | |
89 | if (cmp < 0) { | |
90 | last = next; | |
91 | continue; | |
92 | } | |
93 | first = next+1; | |
94 | } | |
95 | ||
96 | /* insert to make it at "first" */ | |
97 | ALLOC_GROW(rename_src, rename_src_nr + 1, rename_src_alloc); | |
98 | rename_src_nr++; | |
99 | if (first < rename_src_nr) | |
100 | memmove(rename_src + first + 1, rename_src + first, | |
101 | (rename_src_nr - first - 1) * sizeof(*rename_src)); | |
102 | rename_src[first].p = p; | |
103 | rename_src[first].score = score; | |
104 | return &(rename_src[first]); | |
105 | } | |
106 | ||
107 | static int basename_same(struct diff_filespec *src, struct diff_filespec *dst) | |
108 | { | |
109 | int src_len = strlen(src->path), dst_len = strlen(dst->path); | |
110 | while (src_len && dst_len) { | |
111 | char c1 = src->path[--src_len]; | |
112 | char c2 = dst->path[--dst_len]; | |
113 | if (c1 != c2) | |
114 | return 0; | |
115 | if (c1 == '/') | |
116 | return 1; | |
117 | } | |
118 | return (!src_len || src->path[src_len - 1] == '/') && | |
119 | (!dst_len || dst->path[dst_len - 1] == '/'); | |
120 | } | |
121 | ||
122 | struct diff_score { | |
123 | int src; /* index in rename_src */ | |
124 | int dst; /* index in rename_dst */ | |
125 | unsigned short score; | |
126 | short name_score; | |
127 | }; | |
128 | ||
129 | static int estimate_similarity(struct diff_filespec *src, | |
130 | struct diff_filespec *dst, | |
131 | int minimum_score) | |
132 | { | |
133 | /* src points at a file that existed in the original tree (or | |
134 | * optionally a file in the destination tree) and dst points | |
135 | * at a newly created file. They may be quite similar, in which | |
136 | * case we want to say src is renamed to dst or src is copied into | |
137 | * dst, and then some edit has been applied to dst. | |
138 | * | |
139 | * Compare them and return how similar they are, representing | |
140 | * the score as an integer between 0 and MAX_SCORE. | |
141 | * | |
142 | * When there is an exact match, it is considered a better | |
143 | * match than anything else; the destination does not even | |
144 | * call into this function in that case. | |
145 | */ | |
146 | unsigned long max_size, delta_size, base_size, src_copied, literal_added; | |
147 | unsigned long delta_limit; | |
148 | int score; | |
149 | ||
150 | /* We deal only with regular files. Symlink renames are handled | |
151 | * only when they are exact matches --- in other words, no edits | |
152 | * after renaming. | |
153 | */ | |
154 | if (!S_ISREG(src->mode) || !S_ISREG(dst->mode)) | |
155 | return 0; | |
156 | ||
157 | /* | |
158 | * Need to check that source and destination sizes are | |
159 | * filled in before comparing them. | |
160 | * | |
161 | * If we already have "cnt_data" filled in, we know it's | |
162 | * all good (avoid checking the size for zero, as that | |
163 | * is a possible size - we really should have a flag to | |
164 | * say whether the size is valid or not!) | |
165 | */ | |
166 | if (!src->cnt_data && | |
167 | diff_populate_filespec(src, CHECK_SIZE_ONLY)) | |
168 | return 0; | |
169 | if (!dst->cnt_data && | |
170 | diff_populate_filespec(dst, CHECK_SIZE_ONLY)) | |
171 | return 0; | |
172 | ||
173 | max_size = ((src->size > dst->size) ? src->size : dst->size); | |
174 | base_size = ((src->size < dst->size) ? src->size : dst->size); | |
175 | delta_size = max_size - base_size; | |
176 | ||
177 | /* We would not consider edits that change the file size so | |
178 | * drastically. delta_size must be smaller than | |
179 | * (MAX_SCORE-minimum_score)/MAX_SCORE * min(src->size, dst->size). | |
180 | * | |
181 | * Note that base_size == 0 case is handled here already | |
182 | * and the final score computation below would not have a | |
183 | * divide-by-zero issue. | |
184 | */ | |
185 | if (max_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE) | |
186 | return 0; | |
187 | ||
188 | if (!src->cnt_data && diff_populate_filespec(src, 0)) | |
189 | return 0; | |
190 | if (!dst->cnt_data && diff_populate_filespec(dst, 0)) | |
191 | return 0; | |
192 | ||
193 | delta_limit = (unsigned long) | |
194 | (base_size * (MAX_SCORE-minimum_score) / MAX_SCORE); | |
195 | if (diffcore_count_changes(src, dst, | |
196 | &src->cnt_data, &dst->cnt_data, | |
197 | delta_limit, | |
198 | &src_copied, &literal_added)) | |
199 | return 0; | |
200 | ||
201 | /* How similar are they? | |
202 | * what percentage of material in dst are from source? | |
203 | */ | |
204 | if (!dst->size) | |
205 | score = 0; /* should not happen */ | |
206 | else | |
207 | score = (int)(src_copied * MAX_SCORE / max_size); | |
208 | return score; | |
209 | } | |
210 | ||
211 | static void record_rename_pair(int dst_index, int src_index, int score) | |
212 | { | |
213 | struct diff_filespec *src, *dst; | |
214 | struct diff_filepair *dp; | |
215 | ||
216 | if (rename_dst[dst_index].pair) | |
217 | die("internal error: dst already matched."); | |
218 | ||
219 | src = rename_src[src_index].p->one; | |
220 | src->rename_used++; | |
221 | src->count++; | |
222 | ||
223 | dst = rename_dst[dst_index].two; | |
224 | dst->count++; | |
225 | ||
226 | dp = diff_queue(NULL, src, dst); | |
227 | dp->renamed_pair = 1; | |
228 | if (!strcmp(src->path, dst->path)) | |
229 | dp->score = rename_src[src_index].score; | |
230 | else | |
231 | dp->score = score; | |
232 | rename_dst[dst_index].pair = dp; | |
233 | } | |
234 | ||
235 | /* | |
236 | * We sort the rename similarity matrix with the score, in descending | |
237 | * order (the most similar first). | |
238 | */ | |
239 | static int score_compare(const void *a_, const void *b_) | |
240 | { | |
241 | const struct diff_score *a = a_, *b = b_; | |
242 | ||
243 | /* sink the unused ones to the bottom */ | |
244 | if (a->dst < 0) | |
245 | return (0 <= b->dst); | |
246 | else if (b->dst < 0) | |
247 | return -1; | |
248 | ||
249 | if (a->score == b->score) | |
250 | return b->name_score - a->name_score; | |
251 | ||
252 | return b->score - a->score; | |
253 | } | |
254 | ||
255 | struct file_similarity { | |
256 | struct hashmap_entry entry; | |
257 | int index; | |
258 | struct diff_filespec *filespec; | |
259 | }; | |
260 | ||
261 | static unsigned int hash_filespec(struct diff_filespec *filespec) | |
262 | { | |
263 | if (!filespec->sha1_valid) { | |
264 | if (diff_populate_filespec(filespec, 0)) | |
265 | return 0; | |
266 | hash_sha1_file(filespec->data, filespec->size, "blob", filespec->sha1); | |
267 | } | |
268 | return sha1hash(filespec->sha1); | |
269 | } | |
270 | ||
271 | static int find_identical_files(struct hashmap *srcs, | |
272 | int dst_index, | |
273 | struct diff_options *options) | |
274 | { | |
275 | int renames = 0; | |
276 | ||
277 | struct diff_filespec *target = rename_dst[dst_index].two; | |
278 | struct file_similarity *p, *best = NULL; | |
279 | int i = 100, best_score = -1; | |
280 | ||
281 | /* | |
282 | * Find the best source match for specified destination. | |
283 | */ | |
284 | p = hashmap_get_from_hash(srcs, hash_filespec(target), NULL); | |
285 | for (; p; p = hashmap_get_next(srcs, p)) { | |
286 | int score; | |
287 | struct diff_filespec *source = p->filespec; | |
288 | ||
289 | /* False hash collision? */ | |
290 | if (hashcmp(source->sha1, target->sha1)) | |
291 | continue; | |
292 | /* Non-regular files? If so, the modes must match! */ | |
293 | if (!S_ISREG(source->mode) || !S_ISREG(target->mode)) { | |
294 | if (source->mode != target->mode) | |
295 | continue; | |
296 | } | |
297 | /* Give higher scores to sources that haven't been used already */ | |
298 | score = !source->rename_used; | |
299 | if (source->rename_used && options->detect_rename != DIFF_DETECT_COPY) | |
300 | continue; | |
301 | score += basename_same(source, target); | |
302 | if (score > best_score) { | |
303 | best = p; | |
304 | best_score = score; | |
305 | if (score == 2) | |
306 | break; | |
307 | } | |
308 | ||
309 | /* Too many identical alternatives? Pick one */ | |
310 | if (!--i) | |
311 | break; | |
312 | } | |
313 | if (best) { | |
314 | record_rename_pair(dst_index, best->index, MAX_SCORE); | |
315 | renames++; | |
316 | } | |
317 | return renames; | |
318 | } | |
319 | ||
320 | static void insert_file_table(struct hashmap *table, int index, struct diff_filespec *filespec) | |
321 | { | |
322 | struct file_similarity *entry = xmalloc(sizeof(*entry)); | |
323 | ||
324 | entry->index = index; | |
325 | entry->filespec = filespec; | |
326 | ||
327 | hashmap_entry_init(entry, hash_filespec(filespec)); | |
328 | hashmap_add(table, entry); | |
329 | } | |
330 | ||
331 | /* | |
332 | * Find exact renames first. | |
333 | * | |
334 | * The first round matches up the up-to-date entries, | |
335 | * and then during the second round we try to match | |
336 | * cache-dirty entries as well. | |
337 | */ | |
338 | static int find_exact_renames(struct diff_options *options) | |
339 | { | |
340 | int i, renames = 0; | |
341 | struct hashmap file_table; | |
342 | ||
343 | /* Add all sources to the hash table */ | |
344 | hashmap_init(&file_table, NULL, rename_src_nr); | |
345 | for (i = 0; i < rename_src_nr; i++) | |
346 | insert_file_table(&file_table, i, rename_src[i].p->one); | |
347 | ||
348 | /* Walk the destinations and find best source match */ | |
349 | for (i = 0; i < rename_dst_nr; i++) | |
350 | renames += find_identical_files(&file_table, i, options); | |
351 | ||
352 | /* Free the hash data structure and entries */ | |
353 | hashmap_free(&file_table, 1); | |
354 | ||
355 | return renames; | |
356 | } | |
357 | ||
358 | #define NUM_CANDIDATE_PER_DST 4 | |
359 | static void record_if_better(struct diff_score m[], struct diff_score *o) | |
360 | { | |
361 | int i, worst; | |
362 | ||
363 | /* find the worst one */ | |
364 | worst = 0; | |
365 | for (i = 1; i < NUM_CANDIDATE_PER_DST; i++) | |
366 | if (score_compare(&m[i], &m[worst]) > 0) | |
367 | worst = i; | |
368 | ||
369 | /* is it better than the worst one? */ | |
370 | if (score_compare(&m[worst], o) > 0) | |
371 | m[worst] = *o; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Returns: | |
376 | * 0 if we are under the limit; | |
377 | * 1 if we need to disable inexact rename detection; | |
378 | * 2 if we would be under the limit if we were given -C instead of -C -C. | |
379 | */ | |
380 | static int too_many_rename_candidates(int num_create, | |
381 | struct diff_options *options) | |
382 | { | |
383 | int rename_limit = options->rename_limit; | |
384 | int num_src = rename_src_nr; | |
385 | int i; | |
386 | ||
387 | options->needed_rename_limit = 0; | |
388 | ||
389 | /* | |
390 | * This basically does a test for the rename matrix not | |
391 | * growing larger than a "rename_limit" square matrix, ie: | |
392 | * | |
393 | * num_create * num_src > rename_limit * rename_limit | |
394 | * | |
395 | * but handles the potential overflow case specially (and we | |
396 | * assume at least 32-bit integers) | |
397 | */ | |
398 | if (rename_limit <= 0 || rename_limit > 32767) | |
399 | rename_limit = 32767; | |
400 | if ((num_create <= rename_limit || num_src <= rename_limit) && | |
401 | (num_create * num_src <= rename_limit * rename_limit)) | |
402 | return 0; | |
403 | ||
404 | options->needed_rename_limit = | |
405 | num_src > num_create ? num_src : num_create; | |
406 | ||
407 | /* Are we running under -C -C? */ | |
408 | if (!DIFF_OPT_TST(options, FIND_COPIES_HARDER)) | |
409 | return 1; | |
410 | ||
411 | /* Would we bust the limit if we were running under -C? */ | |
412 | for (num_src = i = 0; i < rename_src_nr; i++) { | |
413 | if (diff_unmodified_pair(rename_src[i].p)) | |
414 | continue; | |
415 | num_src++; | |
416 | } | |
417 | if ((num_create <= rename_limit || num_src <= rename_limit) && | |
418 | (num_create * num_src <= rename_limit * rename_limit)) | |
419 | return 2; | |
420 | return 1; | |
421 | } | |
422 | ||
423 | static int find_renames(struct diff_score *mx, int dst_cnt, int minimum_score, int copies) | |
424 | { | |
425 | int count = 0, i; | |
426 | ||
427 | for (i = 0; i < dst_cnt * NUM_CANDIDATE_PER_DST; i++) { | |
428 | struct diff_rename_dst *dst; | |
429 | ||
430 | if ((mx[i].dst < 0) || | |
431 | (mx[i].score < minimum_score)) | |
432 | break; /* there is no more usable pair. */ | |
433 | dst = &rename_dst[mx[i].dst]; | |
434 | if (dst->pair) | |
435 | continue; /* already done, either exact or fuzzy. */ | |
436 | if (!copies && rename_src[mx[i].src].p->one->rename_used) | |
437 | continue; | |
438 | record_rename_pair(mx[i].dst, mx[i].src, mx[i].score); | |
439 | count++; | |
440 | } | |
441 | return count; | |
442 | } | |
443 | ||
444 | void diffcore_rename(struct diff_options *options) | |
445 | { | |
446 | int detect_rename = options->detect_rename; | |
447 | int minimum_score = options->rename_score; | |
448 | struct diff_queue_struct *q = &diff_queued_diff; | |
449 | struct diff_queue_struct outq; | |
450 | struct diff_score *mx; | |
451 | int i, j, rename_count, skip_unmodified = 0; | |
452 | int num_create, dst_cnt; | |
453 | struct progress *progress = NULL; | |
454 | ||
455 | if (!minimum_score) | |
456 | minimum_score = DEFAULT_RENAME_SCORE; | |
457 | ||
458 | for (i = 0; i < q->nr; i++) { | |
459 | struct diff_filepair *p = q->queue[i]; | |
460 | if (!DIFF_FILE_VALID(p->one)) { | |
461 | if (!DIFF_FILE_VALID(p->two)) | |
462 | continue; /* unmerged */ | |
463 | else if (options->single_follow && | |
464 | strcmp(options->single_follow, p->two->path)) | |
465 | continue; /* not interested */ | |
466 | else if (!DIFF_OPT_TST(options, RENAME_EMPTY) && | |
467 | is_empty_blob_sha1(p->two->sha1)) | |
468 | continue; | |
469 | else if (add_rename_dst(p->two) < 0) { | |
470 | warning("skipping rename detection, detected" | |
471 | " duplicate destination '%s'", | |
472 | p->two->path); | |
473 | goto cleanup; | |
474 | } | |
475 | } | |
476 | else if (!DIFF_OPT_TST(options, RENAME_EMPTY) && | |
477 | is_empty_blob_sha1(p->one->sha1)) | |
478 | continue; | |
479 | else if (!DIFF_PAIR_UNMERGED(p) && !DIFF_FILE_VALID(p->two)) { | |
480 | /* | |
481 | * If the source is a broken "delete", and | |
482 | * they did not really want to get broken, | |
483 | * that means the source actually stays. | |
484 | * So we increment the "rename_used" score | |
485 | * by one, to indicate ourselves as a user | |
486 | */ | |
487 | if (p->broken_pair && !p->score) | |
488 | p->one->rename_used++; | |
489 | register_rename_src(p); | |
490 | } | |
491 | else if (detect_rename == DIFF_DETECT_COPY) { | |
492 | /* | |
493 | * Increment the "rename_used" score by | |
494 | * one, to indicate ourselves as a user. | |
495 | */ | |
496 | p->one->rename_used++; | |
497 | register_rename_src(p); | |
498 | } | |
499 | } | |
500 | if (rename_dst_nr == 0 || rename_src_nr == 0) | |
501 | goto cleanup; /* nothing to do */ | |
502 | ||
503 | /* | |
504 | * We really want to cull the candidates list early | |
505 | * with cheap tests in order to avoid doing deltas. | |
506 | */ | |
507 | rename_count = find_exact_renames(options); | |
508 | ||
509 | /* Did we only want exact renames? */ | |
510 | if (minimum_score == MAX_SCORE) | |
511 | goto cleanup; | |
512 | ||
513 | /* | |
514 | * Calculate how many renames are left (but all the source | |
515 | * files still remain as options for rename/copies!) | |
516 | */ | |
517 | num_create = (rename_dst_nr - rename_count); | |
518 | ||
519 | /* All done? */ | |
520 | if (!num_create) | |
521 | goto cleanup; | |
522 | ||
523 | switch (too_many_rename_candidates(num_create, options)) { | |
524 | case 1: | |
525 | goto cleanup; | |
526 | case 2: | |
527 | options->degraded_cc_to_c = 1; | |
528 | skip_unmodified = 1; | |
529 | break; | |
530 | default: | |
531 | break; | |
532 | } | |
533 | ||
534 | if (options->show_rename_progress) { | |
535 | progress = start_progress_delay( | |
536 | _("Performing inexact rename detection"), | |
537 | rename_dst_nr * rename_src_nr, 50, 1); | |
538 | } | |
539 | ||
540 | mx = xcalloc(num_create * NUM_CANDIDATE_PER_DST, sizeof(*mx)); | |
541 | for (dst_cnt = i = 0; i < rename_dst_nr; i++) { | |
542 | struct diff_filespec *two = rename_dst[i].two; | |
543 | struct diff_score *m; | |
544 | ||
545 | if (rename_dst[i].pair) | |
546 | continue; /* dealt with exact match already. */ | |
547 | ||
548 | m = &mx[dst_cnt * NUM_CANDIDATE_PER_DST]; | |
549 | for (j = 0; j < NUM_CANDIDATE_PER_DST; j++) | |
550 | m[j].dst = -1; | |
551 | ||
552 | for (j = 0; j < rename_src_nr; j++) { | |
553 | struct diff_filespec *one = rename_src[j].p->one; | |
554 | struct diff_score this_src; | |
555 | ||
556 | if (skip_unmodified && | |
557 | diff_unmodified_pair(rename_src[j].p)) | |
558 | continue; | |
559 | ||
560 | this_src.score = estimate_similarity(one, two, | |
561 | minimum_score); | |
562 | this_src.name_score = basename_same(one, two); | |
563 | this_src.dst = i; | |
564 | this_src.src = j; | |
565 | record_if_better(m, &this_src); | |
566 | /* | |
567 | * Once we run estimate_similarity, | |
568 | * We do not need the text anymore. | |
569 | */ | |
570 | diff_free_filespec_blob(one); | |
571 | diff_free_filespec_blob(two); | |
572 | } | |
573 | dst_cnt++; | |
574 | display_progress(progress, (i+1)*rename_src_nr); | |
575 | } | |
576 | stop_progress(&progress); | |
577 | ||
578 | /* cost matrix sorted by most to least similar pair */ | |
579 | qsort(mx, dst_cnt * NUM_CANDIDATE_PER_DST, sizeof(*mx), score_compare); | |
580 | ||
581 | rename_count += find_renames(mx, dst_cnt, minimum_score, 0); | |
582 | if (detect_rename == DIFF_DETECT_COPY) | |
583 | rename_count += find_renames(mx, dst_cnt, minimum_score, 1); | |
584 | free(mx); | |
585 | ||
586 | cleanup: | |
587 | /* At this point, we have found some renames and copies and they | |
588 | * are recorded in rename_dst. The original list is still in *q. | |
589 | */ | |
590 | DIFF_QUEUE_CLEAR(&outq); | |
591 | for (i = 0; i < q->nr; i++) { | |
592 | struct diff_filepair *p = q->queue[i]; | |
593 | struct diff_filepair *pair_to_free = NULL; | |
594 | ||
595 | if (DIFF_PAIR_UNMERGED(p)) { | |
596 | diff_q(&outq, p); | |
597 | } | |
598 | else if (!DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) { | |
599 | /* | |
600 | * Creation | |
601 | * | |
602 | * We would output this create record if it has | |
603 | * not been turned into a rename/copy already. | |
604 | */ | |
605 | struct diff_rename_dst *dst = locate_rename_dst(p->two); | |
606 | if (dst && dst->pair) { | |
607 | diff_q(&outq, dst->pair); | |
608 | pair_to_free = p; | |
609 | } | |
610 | else | |
611 | /* no matching rename/copy source, so | |
612 | * record this as a creation. | |
613 | */ | |
614 | diff_q(&outq, p); | |
615 | } | |
616 | else if (DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two)) { | |
617 | /* | |
618 | * Deletion | |
619 | * | |
620 | * We would output this delete record if: | |
621 | * | |
622 | * (1) this is a broken delete and the counterpart | |
623 | * broken create remains in the output; or | |
624 | * (2) this is not a broken delete, and rename_dst | |
625 | * does not have a rename/copy to move p->one->path | |
626 | * out of existence. | |
627 | * | |
628 | * Otherwise, the counterpart broken create | |
629 | * has been turned into a rename-edit; or | |
630 | * delete did not have a matching create to | |
631 | * begin with. | |
632 | */ | |
633 | if (DIFF_PAIR_BROKEN(p)) { | |
634 | /* broken delete */ | |
635 | struct diff_rename_dst *dst = locate_rename_dst(p->one); | |
636 | if (dst && dst->pair) | |
637 | /* counterpart is now rename/copy */ | |
638 | pair_to_free = p; | |
639 | } | |
640 | else { | |
641 | if (p->one->rename_used) | |
642 | /* this path remains */ | |
643 | pair_to_free = p; | |
644 | } | |
645 | ||
646 | if (pair_to_free) | |
647 | ; | |
648 | else | |
649 | diff_q(&outq, p); | |
650 | } | |
651 | else if (!diff_unmodified_pair(p)) | |
652 | /* all the usual ones need to be kept */ | |
653 | diff_q(&outq, p); | |
654 | else | |
655 | /* no need to keep unmodified pairs */ | |
656 | pair_to_free = p; | |
657 | ||
658 | if (pair_to_free) | |
659 | diff_free_filepair(pair_to_free); | |
660 | } | |
661 | diff_debug_queue("done copying original", &outq); | |
662 | ||
663 | free(q->queue); | |
664 | *q = outq; | |
665 | diff_debug_queue("done collapsing", q); | |
666 | ||
667 | for (i = 0; i < rename_dst_nr; i++) | |
668 | free_filespec(rename_dst[i].two); | |
669 | ||
670 | free(rename_dst); | |
671 | rename_dst = NULL; | |
672 | rename_dst_nr = rename_dst_alloc = 0; | |
673 | free(rename_src); | |
674 | rename_src = NULL; | |
675 | rename_src_nr = rename_src_alloc = 0; | |
676 | return; | |
677 | } |