Fold get_merge_bases_clean() into get_merge_bases()
[git/git.git] / revision.c
1 #include "cache.h"
2 #include "tag.h"
3 #include "blob.h"
4 #include "tree.h"
5 #include "commit.h"
6 #include "diff.h"
7 #include "refs.h"
8 #include "revision.h"
9
10 static char *path_name(struct name_path *path, const char *name)
11 {
12 struct name_path *p;
13 char *n, *m;
14 int nlen = strlen(name);
15 int len = nlen + 1;
16
17 for (p = path; p; p = p->up) {
18 if (p->elem_len)
19 len += p->elem_len + 1;
20 }
21 n = xmalloc(len);
22 m = n + len - (nlen + 1);
23 strcpy(m, name);
24 for (p = path; p; p = p->up) {
25 if (p->elem_len) {
26 m -= p->elem_len + 1;
27 memcpy(m, p->elem, p->elem_len);
28 m[p->elem_len] = '/';
29 }
30 }
31 return n;
32 }
33
34 void add_object(struct object *obj,
35 struct object_array *p,
36 struct name_path *path,
37 const char *name)
38 {
39 add_object_array(obj, path_name(path, name), p);
40 }
41
42 static void mark_blob_uninteresting(struct blob *blob)
43 {
44 if (blob->object.flags & UNINTERESTING)
45 return;
46 blob->object.flags |= UNINTERESTING;
47 }
48
49 void mark_tree_uninteresting(struct tree *tree)
50 {
51 struct tree_desc desc;
52 struct name_entry entry;
53 struct object *obj = &tree->object;
54
55 if (obj->flags & UNINTERESTING)
56 return;
57 obj->flags |= UNINTERESTING;
58 if (!has_sha1_file(obj->sha1))
59 return;
60 if (parse_tree(tree) < 0)
61 die("bad tree %s", sha1_to_hex(obj->sha1));
62
63 desc.buf = tree->buffer;
64 desc.size = tree->size;
65 while (tree_entry(&desc, &entry)) {
66 if (S_ISDIR(entry.mode))
67 mark_tree_uninteresting(lookup_tree(entry.sha1));
68 else
69 mark_blob_uninteresting(lookup_blob(entry.sha1));
70 }
71
72 /*
73 * We don't care about the tree any more
74 * after it has been marked uninteresting.
75 */
76 free(tree->buffer);
77 tree->buffer = NULL;
78 }
79
80 void mark_parents_uninteresting(struct commit *commit)
81 {
82 struct commit_list *parents = commit->parents;
83
84 while (parents) {
85 struct commit *commit = parents->item;
86 if (!(commit->object.flags & UNINTERESTING)) {
87 commit->object.flags |= UNINTERESTING;
88
89 /*
90 * Normally we haven't parsed the parent
91 * yet, so we won't have a parent of a parent
92 * here. However, it may turn out that we've
93 * reached this commit some other way (where it
94 * wasn't uninteresting), in which case we need
95 * to mark its parents recursively too..
96 */
97 if (commit->parents)
98 mark_parents_uninteresting(commit);
99 }
100
101 /*
102 * A missing commit is ok iff its parent is marked
103 * uninteresting.
104 *
105 * We just mark such a thing parsed, so that when
106 * it is popped next time around, we won't be trying
107 * to parse it and get an error.
108 */
109 if (!has_sha1_file(commit->object.sha1))
110 commit->object.parsed = 1;
111 parents = parents->next;
112 }
113 }
114
115 void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
116 {
117 add_object_array(obj, name, &revs->pending);
118 }
119
120 static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
121 {
122 struct object *object;
123
124 object = parse_object(sha1);
125 if (!object)
126 die("bad object %s", name);
127 object->flags |= flags;
128 return object;
129 }
130
131 static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
132 {
133 unsigned long flags = object->flags;
134
135 /*
136 * Tag object? Look what it points to..
137 */
138 while (object->type == TYPE_TAG) {
139 struct tag *tag = (struct tag *) object;
140 if (revs->tag_objects && !(flags & UNINTERESTING))
141 add_pending_object(revs, object, tag->tag);
142 object = parse_object(tag->tagged->sha1);
143 if (!object)
144 die("bad object %s", sha1_to_hex(tag->tagged->sha1));
145 }
146
147 /*
148 * Commit object? Just return it, we'll do all the complex
149 * reachability crud.
150 */
151 if (object->type == TYPE_COMMIT) {
152 struct commit *commit = (struct commit *)object;
153 if (parse_commit(commit) < 0)
154 die("unable to parse commit %s", name);
155 if (flags & UNINTERESTING) {
156 commit->object.flags |= UNINTERESTING;
157 mark_parents_uninteresting(commit);
158 revs->limited = 1;
159 }
160 return commit;
161 }
162
163 /*
164 * Tree object? Either mark it uniniteresting, or add it
165 * to the list of objects to look at later..
166 */
167 if (object->type == TYPE_TREE) {
168 struct tree *tree = (struct tree *)object;
169 if (!revs->tree_objects)
170 return NULL;
171 if (flags & UNINTERESTING) {
172 mark_tree_uninteresting(tree);
173 return NULL;
174 }
175 add_pending_object(revs, object, "");
176 return NULL;
177 }
178
179 /*
180 * Blob object? You know the drill by now..
181 */
182 if (object->type == TYPE_BLOB) {
183 struct blob *blob = (struct blob *)object;
184 if (!revs->blob_objects)
185 return NULL;
186 if (flags & UNINTERESTING) {
187 mark_blob_uninteresting(blob);
188 return NULL;
189 }
190 add_pending_object(revs, object, "");
191 return NULL;
192 }
193 die("%s is unknown object", name);
194 }
195
196 static int everybody_uninteresting(struct commit_list *orig)
197 {
198 struct commit_list *list = orig;
199 while (list) {
200 struct commit *commit = list->item;
201 list = list->next;
202 if (commit->object.flags & UNINTERESTING)
203 continue;
204 return 0;
205 }
206 return 1;
207 }
208
209 static int tree_difference = REV_TREE_SAME;
210
211 static void file_add_remove(struct diff_options *options,
212 int addremove, unsigned mode,
213 const unsigned char *sha1,
214 const char *base, const char *path)
215 {
216 int diff = REV_TREE_DIFFERENT;
217
218 /*
219 * Is it an add of a new file? It means that the old tree
220 * didn't have it at all, so we will turn "REV_TREE_SAME" ->
221 * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
222 * (and if it already was "REV_TREE_NEW", we'll keep it
223 * "REV_TREE_NEW" of course).
224 */
225 if (addremove == '+') {
226 diff = tree_difference;
227 if (diff != REV_TREE_SAME)
228 return;
229 diff = REV_TREE_NEW;
230 }
231 tree_difference = diff;
232 }
233
234 static void file_change(struct diff_options *options,
235 unsigned old_mode, unsigned new_mode,
236 const unsigned char *old_sha1,
237 const unsigned char *new_sha1,
238 const char *base, const char *path)
239 {
240 tree_difference = REV_TREE_DIFFERENT;
241 }
242
243 int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
244 {
245 if (!t1)
246 return REV_TREE_NEW;
247 if (!t2)
248 return REV_TREE_DIFFERENT;
249 tree_difference = REV_TREE_SAME;
250 if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
251 &revs->pruning) < 0)
252 return REV_TREE_DIFFERENT;
253 return tree_difference;
254 }
255
256 int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
257 {
258 int retval;
259 void *tree;
260 struct tree_desc empty, real;
261
262 if (!t1)
263 return 0;
264
265 tree = read_object_with_reference(t1->object.sha1, tree_type, &real.size, NULL);
266 if (!tree)
267 return 0;
268 real.buf = tree;
269
270 empty.buf = "";
271 empty.size = 0;
272
273 tree_difference = 0;
274 retval = diff_tree(&empty, &real, "", &revs->pruning);
275 free(tree);
276
277 return retval >= 0 && !tree_difference;
278 }
279
280 static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
281 {
282 struct commit_list **pp, *parent;
283 int tree_changed = 0;
284
285 if (!commit->tree)
286 return;
287
288 if (!commit->parents) {
289 if (!rev_same_tree_as_empty(revs, commit->tree))
290 commit->object.flags |= TREECHANGE;
291 return;
292 }
293
294 pp = &commit->parents;
295 while ((parent = *pp) != NULL) {
296 struct commit *p = parent->item;
297
298 parse_commit(p);
299 switch (rev_compare_tree(revs, p->tree, commit->tree)) {
300 case REV_TREE_SAME:
301 if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
302 /* Even if a merge with an uninteresting
303 * side branch brought the entire change
304 * we are interested in, we do not want
305 * to lose the other branches of this
306 * merge, so we just keep going.
307 */
308 pp = &parent->next;
309 continue;
310 }
311 parent->next = NULL;
312 commit->parents = parent;
313 return;
314
315 case REV_TREE_NEW:
316 if (revs->remove_empty_trees &&
317 rev_same_tree_as_empty(revs, p->tree)) {
318 /* We are adding all the specified
319 * paths from this parent, so the
320 * history beyond this parent is not
321 * interesting. Remove its parents
322 * (they are grandparents for us).
323 * IOW, we pretend this parent is a
324 * "root" commit.
325 */
326 parse_commit(p);
327 p->parents = NULL;
328 }
329 /* fallthrough */
330 case REV_TREE_DIFFERENT:
331 tree_changed = 1;
332 pp = &parent->next;
333 continue;
334 }
335 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
336 }
337 if (tree_changed)
338 commit->object.flags |= TREECHANGE;
339 }
340
341 static void add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
342 {
343 struct commit_list *parent = commit->parents;
344
345 if (commit->object.flags & ADDED)
346 return;
347 commit->object.flags |= ADDED;
348
349 /*
350 * If the commit is uninteresting, don't try to
351 * prune parents - we want the maximal uninteresting
352 * set.
353 *
354 * Normally we haven't parsed the parent
355 * yet, so we won't have a parent of a parent
356 * here. However, it may turn out that we've
357 * reached this commit some other way (where it
358 * wasn't uninteresting), in which case we need
359 * to mark its parents recursively too..
360 */
361 if (commit->object.flags & UNINTERESTING) {
362 while (parent) {
363 struct commit *p = parent->item;
364 parent = parent->next;
365 parse_commit(p);
366 p->object.flags |= UNINTERESTING;
367 if (p->parents)
368 mark_parents_uninteresting(p);
369 if (p->object.flags & SEEN)
370 continue;
371 p->object.flags |= SEEN;
372 insert_by_date(p, list);
373 }
374 return;
375 }
376
377 /*
378 * Ok, the commit wasn't uninteresting. Try to
379 * simplify the commit history and find the parent
380 * that has no differences in the path set if one exists.
381 */
382 if (revs->prune_fn)
383 revs->prune_fn(revs, commit);
384
385 if (revs->no_walk)
386 return;
387
388 parent = commit->parents;
389 while (parent) {
390 struct commit *p = parent->item;
391
392 parent = parent->next;
393
394 parse_commit(p);
395 if (p->object.flags & SEEN)
396 continue;
397 p->object.flags |= SEEN;
398 insert_by_date(p, list);
399 }
400 }
401
402 static void limit_list(struct rev_info *revs)
403 {
404 struct commit_list *list = revs->commits;
405 struct commit_list *newlist = NULL;
406 struct commit_list **p = &newlist;
407
408 while (list) {
409 struct commit_list *entry = list;
410 struct commit *commit = list->item;
411 struct object *obj = &commit->object;
412
413 list = list->next;
414 free(entry);
415
416 if (revs->max_age != -1 && (commit->date < revs->max_age))
417 obj->flags |= UNINTERESTING;
418 if (revs->unpacked && has_sha1_pack(obj->sha1))
419 obj->flags |= UNINTERESTING;
420 add_parents_to_list(revs, commit, &list);
421 if (obj->flags & UNINTERESTING) {
422 mark_parents_uninteresting(commit);
423 if (everybody_uninteresting(list))
424 break;
425 continue;
426 }
427 if (revs->min_age != -1 && (commit->date > revs->min_age))
428 continue;
429 p = &commit_list_insert(commit, p)->next;
430 }
431 if (revs->boundary) {
432 /* mark the ones that are on the result list first */
433 for (list = newlist; list; list = list->next) {
434 struct commit *commit = list->item;
435 commit->object.flags |= TMP_MARK;
436 }
437 for (list = newlist; list; list = list->next) {
438 struct commit *commit = list->item;
439 struct object *obj = &commit->object;
440 struct commit_list *parent;
441 if (obj->flags & UNINTERESTING)
442 continue;
443 for (parent = commit->parents;
444 parent;
445 parent = parent->next) {
446 struct commit *pcommit = parent->item;
447 if (!(pcommit->object.flags & UNINTERESTING))
448 continue;
449 pcommit->object.flags |= BOUNDARY;
450 if (pcommit->object.flags & TMP_MARK)
451 continue;
452 pcommit->object.flags |= TMP_MARK;
453 p = &commit_list_insert(pcommit, p)->next;
454 }
455 }
456 for (list = newlist; list; list = list->next) {
457 struct commit *commit = list->item;
458 commit->object.flags &= ~TMP_MARK;
459 }
460 }
461 revs->commits = newlist;
462 }
463
464 static int all_flags;
465 static struct rev_info *all_revs;
466
467 static int handle_one_ref(const char *path, const unsigned char *sha1)
468 {
469 struct object *object = get_reference(all_revs, path, sha1, all_flags);
470 add_pending_object(all_revs, object, "");
471 return 0;
472 }
473
474 static void handle_all(struct rev_info *revs, unsigned flags)
475 {
476 all_revs = revs;
477 all_flags = flags;
478 for_each_ref(handle_one_ref);
479 }
480
481 static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
482 {
483 unsigned char sha1[20];
484 struct object *it;
485 struct commit *commit;
486 struct commit_list *parents;
487
488 if (*arg == '^') {
489 flags ^= UNINTERESTING;
490 arg++;
491 }
492 if (get_sha1(arg, sha1))
493 return 0;
494 while (1) {
495 it = get_reference(revs, arg, sha1, 0);
496 if (it->type != TYPE_TAG)
497 break;
498 memcpy(sha1, ((struct tag*)it)->tagged->sha1, 20);
499 }
500 if (it->type != TYPE_COMMIT)
501 return 0;
502 commit = (struct commit *)it;
503 for (parents = commit->parents; parents; parents = parents->next) {
504 it = &parents->item->object;
505 it->flags |= flags;
506 add_pending_object(revs, it, arg);
507 }
508 return 1;
509 }
510
511 void init_revisions(struct rev_info *revs)
512 {
513 memset(revs, 0, sizeof(*revs));
514
515 revs->abbrev = DEFAULT_ABBREV;
516 revs->ignore_merges = 1;
517 revs->simplify_history = 1;
518 revs->pruning.recursive = 1;
519 revs->pruning.add_remove = file_add_remove;
520 revs->pruning.change = file_change;
521 revs->lifo = 1;
522 revs->dense = 1;
523 revs->prefix = setup_git_directory();
524 revs->max_age = -1;
525 revs->min_age = -1;
526 revs->max_count = -1;
527
528 revs->prune_fn = NULL;
529 revs->prune_data = NULL;
530
531 revs->topo_setter = topo_sort_default_setter;
532 revs->topo_getter = topo_sort_default_getter;
533
534 revs->commit_format = CMIT_FMT_DEFAULT;
535
536 diff_setup(&revs->diffopt);
537 }
538
539 static void add_pending_commit_list(struct rev_info *revs,
540 struct commit_list *commit_list,
541 unsigned int flags)
542 {
543 while (commit_list) {
544 struct object *object = &commit_list->item->object;
545 object->flags |= flags;
546 add_pending_object(revs, object, sha1_to_hex(object->sha1));
547 commit_list = commit_list->next;
548 }
549 }
550
551 /*
552 * Parse revision information, filling in the "rev_info" structure,
553 * and removing the used arguments from the argument list.
554 *
555 * Returns the number of arguments left that weren't recognized
556 * (which are also moved to the head of the argument list)
557 */
558 int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
559 {
560 int i, flags, seen_dashdash;
561 const char **unrecognized = argv + 1;
562 int left = 1;
563
564 /* First, search for "--" */
565 seen_dashdash = 0;
566 for (i = 1; i < argc; i++) {
567 const char *arg = argv[i];
568 if (strcmp(arg, "--"))
569 continue;
570 argv[i] = NULL;
571 argc = i;
572 revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
573 seen_dashdash = 1;
574 break;
575 }
576
577 flags = 0;
578 for (i = 1; i < argc; i++) {
579 struct object *object;
580 const char *arg = argv[i];
581 unsigned char sha1[20];
582 char *dotdot;
583 int local_flags;
584
585 if (*arg == '-') {
586 int opts;
587 if (!strncmp(arg, "--max-count=", 12)) {
588 revs->max_count = atoi(arg + 12);
589 continue;
590 }
591 /* accept -<digit>, like traditional "head" */
592 if ((*arg == '-') && isdigit(arg[1])) {
593 revs->max_count = atoi(arg + 1);
594 continue;
595 }
596 if (!strcmp(arg, "-n")) {
597 if (argc <= i + 1)
598 die("-n requires an argument");
599 revs->max_count = atoi(argv[++i]);
600 continue;
601 }
602 if (!strncmp(arg,"-n",2)) {
603 revs->max_count = atoi(arg + 2);
604 continue;
605 }
606 if (!strncmp(arg, "--max-age=", 10)) {
607 revs->max_age = atoi(arg + 10);
608 continue;
609 }
610 if (!strncmp(arg, "--since=", 8)) {
611 revs->max_age = approxidate(arg + 8);
612 continue;
613 }
614 if (!strncmp(arg, "--after=", 8)) {
615 revs->max_age = approxidate(arg + 8);
616 continue;
617 }
618 if (!strncmp(arg, "--min-age=", 10)) {
619 revs->min_age = atoi(arg + 10);
620 continue;
621 }
622 if (!strncmp(arg, "--before=", 9)) {
623 revs->min_age = approxidate(arg + 9);
624 continue;
625 }
626 if (!strncmp(arg, "--until=", 8)) {
627 revs->min_age = approxidate(arg + 8);
628 continue;
629 }
630 if (!strcmp(arg, "--all")) {
631 handle_all(revs, flags);
632 continue;
633 }
634 if (!strcmp(arg, "--not")) {
635 flags ^= UNINTERESTING;
636 continue;
637 }
638 if (!strcmp(arg, "--default")) {
639 if (++i >= argc)
640 die("bad --default argument");
641 def = argv[i];
642 continue;
643 }
644 if (!strcmp(arg, "--topo-order")) {
645 revs->topo_order = 1;
646 continue;
647 }
648 if (!strcmp(arg, "--date-order")) {
649 revs->lifo = 0;
650 revs->topo_order = 1;
651 continue;
652 }
653 if (!strcmp(arg, "--parents")) {
654 revs->parents = 1;
655 continue;
656 }
657 if (!strcmp(arg, "--dense")) {
658 revs->dense = 1;
659 continue;
660 }
661 if (!strcmp(arg, "--sparse")) {
662 revs->dense = 0;
663 continue;
664 }
665 if (!strcmp(arg, "--remove-empty")) {
666 revs->remove_empty_trees = 1;
667 continue;
668 }
669 if (!strcmp(arg, "--no-merges")) {
670 revs->no_merges = 1;
671 continue;
672 }
673 if (!strcmp(arg, "--boundary")) {
674 revs->boundary = 1;
675 continue;
676 }
677 if (!strcmp(arg, "--objects")) {
678 revs->tag_objects = 1;
679 revs->tree_objects = 1;
680 revs->blob_objects = 1;
681 continue;
682 }
683 if (!strcmp(arg, "--objects-edge")) {
684 revs->tag_objects = 1;
685 revs->tree_objects = 1;
686 revs->blob_objects = 1;
687 revs->edge_hint = 1;
688 continue;
689 }
690 if (!strcmp(arg, "--unpacked")) {
691 revs->unpacked = 1;
692 continue;
693 }
694 if (!strcmp(arg, "-r")) {
695 revs->diff = 1;
696 revs->diffopt.recursive = 1;
697 continue;
698 }
699 if (!strcmp(arg, "-t")) {
700 revs->diff = 1;
701 revs->diffopt.recursive = 1;
702 revs->diffopt.tree_in_recursive = 1;
703 continue;
704 }
705 if (!strcmp(arg, "-m")) {
706 revs->ignore_merges = 0;
707 continue;
708 }
709 if (!strcmp(arg, "-c")) {
710 revs->diff = 1;
711 revs->dense_combined_merges = 0;
712 revs->combine_merges = 1;
713 continue;
714 }
715 if (!strcmp(arg, "--cc")) {
716 revs->diff = 1;
717 revs->dense_combined_merges = 1;
718 revs->combine_merges = 1;
719 continue;
720 }
721 if (!strcmp(arg, "-v")) {
722 revs->verbose_header = 1;
723 continue;
724 }
725 if (!strncmp(arg, "--pretty", 8)) {
726 revs->verbose_header = 1;
727 revs->commit_format = get_commit_format(arg+8);
728 continue;
729 }
730 if (!strcmp(arg, "--root")) {
731 revs->show_root_diff = 1;
732 continue;
733 }
734 if (!strcmp(arg, "--no-commit-id")) {
735 revs->no_commit_id = 1;
736 continue;
737 }
738 if (!strcmp(arg, "--always")) {
739 revs->always_show_header = 1;
740 continue;
741 }
742 if (!strcmp(arg, "--no-abbrev")) {
743 revs->abbrev = 0;
744 continue;
745 }
746 if (!strcmp(arg, "--abbrev")) {
747 revs->abbrev = DEFAULT_ABBREV;
748 continue;
749 }
750 if (!strncmp(arg, "--abbrev=", 9)) {
751 revs->abbrev = strtoul(arg + 9, NULL, 10);
752 if (revs->abbrev < MINIMUM_ABBREV)
753 revs->abbrev = MINIMUM_ABBREV;
754 else if (revs->abbrev > 40)
755 revs->abbrev = 40;
756 continue;
757 }
758 if (!strcmp(arg, "--abbrev-commit")) {
759 revs->abbrev_commit = 1;
760 continue;
761 }
762 if (!strcmp(arg, "--full-diff")) {
763 revs->diff = 1;
764 revs->full_diff = 1;
765 continue;
766 }
767 if (!strcmp(arg, "--full-history")) {
768 revs->simplify_history = 0;
769 continue;
770 }
771 opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
772 if (opts > 0) {
773 revs->diff = 1;
774 i += opts - 1;
775 continue;
776 }
777 *unrecognized++ = arg;
778 left++;
779 continue;
780 }
781 dotdot = strstr(arg, "..");
782 if (dotdot) {
783 unsigned char from_sha1[20];
784 const char *next = dotdot + 2;
785 const char *this = arg;
786 int symmetric = *next == '.';
787 unsigned int flags_exclude = flags ^ UNINTERESTING;
788
789 *dotdot = 0;
790 next += symmetric;
791
792 if (!*next)
793 next = "HEAD";
794 if (dotdot == arg)
795 this = "HEAD";
796 if (!get_sha1(this, from_sha1) &&
797 !get_sha1(next, sha1)) {
798 struct commit *a, *b;
799 struct commit_list *exclude;
800
801 a = lookup_commit_reference(from_sha1);
802 b = lookup_commit_reference(sha1);
803 if (!a || !b) {
804 die(symmetric ?
805 "Invalid symmetric difference expression %s...%s" :
806 "Invalid revision range %s..%s",
807 arg, next);
808 }
809
810 if (!seen_dashdash) {
811 *dotdot = '.';
812 verify_non_filename(revs->prefix, arg);
813 }
814
815 if (symmetric) {
816 exclude = get_merge_bases(a, b, 1);
817 add_pending_commit_list(revs, exclude,
818 flags_exclude);
819 a->object.flags |= flags;
820 } else
821 a->object.flags |= flags_exclude;
822 b->object.flags |= flags;
823 add_pending_object(revs, &a->object, this);
824 add_pending_object(revs, &b->object, next);
825 continue;
826 }
827 *dotdot = '.';
828 }
829 dotdot = strstr(arg, "^@");
830 if (dotdot && !dotdot[2]) {
831 *dotdot = 0;
832 if (add_parents_only(revs, arg, flags))
833 continue;
834 *dotdot = '^';
835 }
836 local_flags = 0;
837 if (*arg == '^') {
838 local_flags = UNINTERESTING;
839 arg++;
840 }
841 if (get_sha1(arg, sha1)) {
842 int j;
843
844 if (seen_dashdash || local_flags)
845 die("bad revision '%s'", arg);
846
847 /* If we didn't have a "--":
848 * (1) all filenames must exist;
849 * (2) all rev-args must not be interpretable
850 * as a valid filename.
851 * but the latter we have checked in the main loop.
852 */
853 for (j = i; j < argc; j++)
854 verify_filename(revs->prefix, argv[j]);
855
856 revs->prune_data = get_pathspec(revs->prefix, argv + i);
857 break;
858 }
859 if (!seen_dashdash)
860 verify_non_filename(revs->prefix, arg);
861 object = get_reference(revs, arg, sha1, flags ^ local_flags);
862 add_pending_object(revs, object, arg);
863 }
864 if (def && !revs->pending.nr) {
865 unsigned char sha1[20];
866 struct object *object;
867 if (get_sha1(def, sha1))
868 die("bad default revision '%s'", def);
869 object = get_reference(revs, def, sha1, 0);
870 add_pending_object(revs, object, def);
871 }
872
873 if (revs->topo_order || revs->unpacked)
874 revs->limited = 1;
875
876 if (revs->prune_data) {
877 diff_tree_setup_paths(revs->prune_data, &revs->pruning);
878 revs->prune_fn = try_to_simplify_commit;
879 if (!revs->full_diff)
880 diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
881 }
882 if (revs->combine_merges) {
883 revs->ignore_merges = 0;
884 if (revs->dense_combined_merges &&
885 (revs->diffopt.output_format != DIFF_FORMAT_DIFFSTAT))
886 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
887 }
888 revs->diffopt.abbrev = revs->abbrev;
889 diff_setup_done(&revs->diffopt);
890
891 return left;
892 }
893
894 void prepare_revision_walk(struct rev_info *revs)
895 {
896 int nr = revs->pending.nr;
897 struct object_array_entry *list = revs->pending.objects;
898
899 revs->pending.nr = 0;
900 revs->pending.alloc = 0;
901 revs->pending.objects = NULL;
902 while (--nr >= 0) {
903 struct commit *commit = handle_commit(revs, list->item, list->name);
904 if (commit) {
905 if (!(commit->object.flags & SEEN)) {
906 commit->object.flags |= SEEN;
907 insert_by_date(commit, &revs->commits);
908 }
909 }
910 list++;
911 }
912
913 if (revs->no_walk)
914 return;
915 if (revs->limited)
916 limit_list(revs);
917 if (revs->topo_order)
918 sort_in_topological_order_fn(&revs->commits, revs->lifo,
919 revs->topo_setter,
920 revs->topo_getter);
921 }
922
923 static int rewrite_one(struct rev_info *revs, struct commit **pp)
924 {
925 for (;;) {
926 struct commit *p = *pp;
927 if (!revs->limited)
928 add_parents_to_list(revs, p, &revs->commits);
929 if (p->object.flags & (TREECHANGE | UNINTERESTING))
930 return 0;
931 if (!p->parents)
932 return -1;
933 *pp = p->parents->item;
934 }
935 }
936
937 static void rewrite_parents(struct rev_info *revs, struct commit *commit)
938 {
939 struct commit_list **pp = &commit->parents;
940 while (*pp) {
941 struct commit_list *parent = *pp;
942 if (rewrite_one(revs, &parent->item) < 0) {
943 *pp = parent->next;
944 continue;
945 }
946 pp = &parent->next;
947 }
948 }
949
950 static void mark_boundary_to_show(struct commit *commit)
951 {
952 struct commit_list *p = commit->parents;
953 while (p) {
954 commit = p->item;
955 p = p->next;
956 if (commit->object.flags & BOUNDARY)
957 commit->object.flags |= BOUNDARY_SHOW;
958 }
959 }
960
961 struct commit *get_revision(struct rev_info *revs)
962 {
963 struct commit_list *list = revs->commits;
964
965 if (!list)
966 return NULL;
967
968 /* Check the max_count ... */
969 switch (revs->max_count) {
970 case -1:
971 break;
972 case 0:
973 return NULL;
974 default:
975 revs->max_count--;
976 }
977
978 do {
979 struct commit_list *entry = revs->commits;
980 struct commit *commit = entry->item;
981
982 revs->commits = entry->next;
983 free(entry);
984
985 /*
986 * If we haven't done the list limiting, we need to look at
987 * the parents here. We also need to do the date-based limiting
988 * that we'd otherwise have done in limit_list().
989 */
990 if (!revs->limited) {
991 if ((revs->unpacked &&
992 has_sha1_pack(commit->object.sha1)) ||
993 (revs->max_age != -1 &&
994 (commit->date < revs->max_age)))
995 continue;
996 add_parents_to_list(revs, commit, &revs->commits);
997 }
998 if (commit->object.flags & SHOWN)
999 continue;
1000
1001 /* We want to show boundary commits only when their
1002 * children are shown. When path-limiter is in effect,
1003 * rewrite_parents() drops some commits from getting shown,
1004 * and there is no point showing boundary parents that
1005 * are not shown. After rewrite_parents() rewrites the
1006 * parents of a commit that is shown, we mark the boundary
1007 * parents with BOUNDARY_SHOW.
1008 */
1009 if (commit->object.flags & BOUNDARY_SHOW) {
1010 commit->object.flags |= SHOWN;
1011 return commit;
1012 }
1013 if (commit->object.flags & UNINTERESTING)
1014 continue;
1015 if (revs->min_age != -1 && (commit->date > revs->min_age))
1016 continue;
1017 if (revs->no_merges &&
1018 commit->parents && commit->parents->next)
1019 continue;
1020 if (revs->prune_fn && revs->dense) {
1021 if (!(commit->object.flags & TREECHANGE))
1022 continue;
1023 if (revs->parents)
1024 rewrite_parents(revs, commit);
1025 }
1026 if (revs->boundary)
1027 mark_boundary_to_show(commit);
1028 commit->object.flags |= SHOWN;
1029 return commit;
1030 } while (revs->commits);
1031 return NULL;
1032 }