setup_revisions(): Allow walking history in a submodule
[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 #include "graph.h"
10 #include "grep.h"
11 #include "reflog-walk.h"
12 #include "patch-ids.h"
13 #include "decorate.h"
14 #include "log-tree.h"
15 #include "string-list.h"
16
17 volatile show_early_output_fn_t show_early_output;
18
19 char *path_name(const struct name_path *path, const char *name)
20 {
21 const struct name_path *p;
22 char *n, *m;
23 int nlen = strlen(name);
24 int len = nlen + 1;
25
26 for (p = path; p; p = p->up) {
27 if (p->elem_len)
28 len += p->elem_len + 1;
29 }
30 n = xmalloc(len);
31 m = n + len - (nlen + 1);
32 strcpy(m, name);
33 for (p = path; p; p = p->up) {
34 if (p->elem_len) {
35 m -= p->elem_len + 1;
36 memcpy(m, p->elem, p->elem_len);
37 m[p->elem_len] = '/';
38 }
39 }
40 return n;
41 }
42
43 void add_object(struct object *obj,
44 struct object_array *p,
45 struct name_path *path,
46 const char *name)
47 {
48 add_object_array(obj, path_name(path, name), p);
49 }
50
51 static void mark_blob_uninteresting(struct blob *blob)
52 {
53 if (!blob)
54 return;
55 if (blob->object.flags & UNINTERESTING)
56 return;
57 blob->object.flags |= UNINTERESTING;
58 }
59
60 void mark_tree_uninteresting(struct tree *tree)
61 {
62 struct tree_desc desc;
63 struct name_entry entry;
64 struct object *obj = &tree->object;
65
66 if (!tree)
67 return;
68 if (obj->flags & UNINTERESTING)
69 return;
70 obj->flags |= UNINTERESTING;
71 if (!has_sha1_file(obj->sha1))
72 return;
73 if (parse_tree(tree) < 0)
74 die("bad tree %s", sha1_to_hex(obj->sha1));
75
76 init_tree_desc(&desc, tree->buffer, tree->size);
77 while (tree_entry(&desc, &entry)) {
78 switch (object_type(entry.mode)) {
79 case OBJ_TREE:
80 mark_tree_uninteresting(lookup_tree(entry.sha1));
81 break;
82 case OBJ_BLOB:
83 mark_blob_uninteresting(lookup_blob(entry.sha1));
84 break;
85 default:
86 /* Subproject commit - not in this repository */
87 break;
88 }
89 }
90
91 /*
92 * We don't care about the tree any more
93 * after it has been marked uninteresting.
94 */
95 free(tree->buffer);
96 tree->buffer = NULL;
97 }
98
99 void mark_parents_uninteresting(struct commit *commit)
100 {
101 struct commit_list *parents = commit->parents;
102
103 while (parents) {
104 struct commit *commit = parents->item;
105 if (!(commit->object.flags & UNINTERESTING)) {
106 commit->object.flags |= UNINTERESTING;
107
108 /*
109 * Normally we haven't parsed the parent
110 * yet, so we won't have a parent of a parent
111 * here. However, it may turn out that we've
112 * reached this commit some other way (where it
113 * wasn't uninteresting), in which case we need
114 * to mark its parents recursively too..
115 */
116 if (commit->parents)
117 mark_parents_uninteresting(commit);
118 }
119
120 /*
121 * A missing commit is ok iff its parent is marked
122 * uninteresting.
123 *
124 * We just mark such a thing parsed, so that when
125 * it is popped next time around, we won't be trying
126 * to parse it and get an error.
127 */
128 if (!has_sha1_file(commit->object.sha1))
129 commit->object.parsed = 1;
130 parents = parents->next;
131 }
132 }
133
134 static void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode)
135 {
136 if (revs->no_walk && (obj->flags & UNINTERESTING))
137 revs->no_walk = 0;
138 if (revs->reflog_info && obj->type == OBJ_COMMIT) {
139 struct strbuf buf = STRBUF_INIT;
140 int len = interpret_branch_name(name, &buf);
141 int st;
142
143 if (0 < len && name[len] && buf.len)
144 strbuf_addstr(&buf, name + len);
145 st = add_reflog_for_walk(revs->reflog_info,
146 (struct commit *)obj,
147 buf.buf[0] ? buf.buf: name);
148 strbuf_release(&buf);
149 if (st)
150 return;
151 }
152 add_object_array_with_mode(obj, name, &revs->pending, mode);
153 }
154
155 void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
156 {
157 add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
158 }
159
160 void add_head_to_pending(struct rev_info *revs)
161 {
162 unsigned char sha1[20];
163 struct object *obj;
164 if (get_sha1("HEAD", sha1))
165 return;
166 obj = parse_object(sha1);
167 if (!obj)
168 return;
169 add_pending_object(revs, obj, "HEAD");
170 }
171
172 static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
173 {
174 struct object *object;
175
176 object = parse_object(sha1);
177 if (!object)
178 die("bad object %s", name);
179 object->flags |= flags;
180 return object;
181 }
182
183 static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
184 {
185 unsigned long flags = object->flags;
186
187 /*
188 * Tag object? Look what it points to..
189 */
190 while (object->type == OBJ_TAG) {
191 struct tag *tag = (struct tag *) object;
192 if (revs->tag_objects && !(flags & UNINTERESTING))
193 add_pending_object(revs, object, tag->tag);
194 if (!tag->tagged)
195 die("bad tag");
196 object = parse_object(tag->tagged->sha1);
197 if (!object) {
198 if (flags & UNINTERESTING)
199 return NULL;
200 die("bad object %s", sha1_to_hex(tag->tagged->sha1));
201 }
202 }
203
204 /*
205 * Commit object? Just return it, we'll do all the complex
206 * reachability crud.
207 */
208 if (object->type == OBJ_COMMIT) {
209 struct commit *commit = (struct commit *)object;
210 if (parse_commit(commit) < 0)
211 die("unable to parse commit %s", name);
212 if (flags & UNINTERESTING) {
213 commit->object.flags |= UNINTERESTING;
214 mark_parents_uninteresting(commit);
215 revs->limited = 1;
216 }
217 if (revs->show_source && !commit->util)
218 commit->util = (void *) name;
219 return commit;
220 }
221
222 /*
223 * Tree object? Either mark it uninteresting, or add it
224 * to the list of objects to look at later..
225 */
226 if (object->type == OBJ_TREE) {
227 struct tree *tree = (struct tree *)object;
228 if (!revs->tree_objects)
229 return NULL;
230 if (flags & UNINTERESTING) {
231 mark_tree_uninteresting(tree);
232 return NULL;
233 }
234 add_pending_object(revs, object, "");
235 return NULL;
236 }
237
238 /*
239 * Blob object? You know the drill by now..
240 */
241 if (object->type == OBJ_BLOB) {
242 struct blob *blob = (struct blob *)object;
243 if (!revs->blob_objects)
244 return NULL;
245 if (flags & UNINTERESTING) {
246 mark_blob_uninteresting(blob);
247 return NULL;
248 }
249 add_pending_object(revs, object, "");
250 return NULL;
251 }
252 die("%s is unknown object", name);
253 }
254
255 static int everybody_uninteresting(struct commit_list *orig)
256 {
257 struct commit_list *list = orig;
258 while (list) {
259 struct commit *commit = list->item;
260 list = list->next;
261 if (commit->object.flags & UNINTERESTING)
262 continue;
263 return 0;
264 }
265 return 1;
266 }
267
268 /*
269 * The goal is to get REV_TREE_NEW as the result only if the
270 * diff consists of all '+' (and no other changes), REV_TREE_OLD
271 * if the whole diff is removal of old data, and otherwise
272 * REV_TREE_DIFFERENT (of course if the trees are the same we
273 * want REV_TREE_SAME).
274 * That means that once we get to REV_TREE_DIFFERENT, we do not
275 * have to look any further.
276 */
277 static int tree_difference = REV_TREE_SAME;
278
279 static void file_add_remove(struct diff_options *options,
280 int addremove, unsigned mode,
281 const unsigned char *sha1,
282 const char *fullpath, unsigned dirty_submodule)
283 {
284 int diff = addremove == '+' ? REV_TREE_NEW : REV_TREE_OLD;
285
286 tree_difference |= diff;
287 if (tree_difference == REV_TREE_DIFFERENT)
288 DIFF_OPT_SET(options, HAS_CHANGES);
289 }
290
291 static void file_change(struct diff_options *options,
292 unsigned old_mode, unsigned new_mode,
293 const unsigned char *old_sha1,
294 const unsigned char *new_sha1,
295 const char *fullpath,
296 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
297 {
298 tree_difference = REV_TREE_DIFFERENT;
299 DIFF_OPT_SET(options, HAS_CHANGES);
300 }
301
302 static int rev_compare_tree(struct rev_info *revs, struct commit *parent, struct commit *commit)
303 {
304 struct tree *t1 = parent->tree;
305 struct tree *t2 = commit->tree;
306
307 if (!t1)
308 return REV_TREE_NEW;
309 if (!t2)
310 return REV_TREE_OLD;
311
312 if (revs->simplify_by_decoration) {
313 /*
314 * If we are simplifying by decoration, then the commit
315 * is worth showing if it has a tag pointing at it.
316 */
317 if (lookup_decoration(&name_decoration, &commit->object))
318 return REV_TREE_DIFFERENT;
319 /*
320 * A commit that is not pointed by a tag is uninteresting
321 * if we are not limited by path. This means that you will
322 * see the usual "commits that touch the paths" plus any
323 * tagged commit by specifying both --simplify-by-decoration
324 * and pathspec.
325 */
326 if (!revs->prune_data)
327 return REV_TREE_SAME;
328 }
329
330 tree_difference = REV_TREE_SAME;
331 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
332 if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
333 &revs->pruning) < 0)
334 return REV_TREE_DIFFERENT;
335 return tree_difference;
336 }
337
338 static int rev_same_tree_as_empty(struct rev_info *revs, struct commit *commit)
339 {
340 int retval;
341 void *tree;
342 unsigned long size;
343 struct tree_desc empty, real;
344 struct tree *t1 = commit->tree;
345
346 if (!t1)
347 return 0;
348
349 tree = read_object_with_reference(t1->object.sha1, tree_type, &size, NULL);
350 if (!tree)
351 return 0;
352 init_tree_desc(&real, tree, size);
353 init_tree_desc(&empty, "", 0);
354
355 tree_difference = REV_TREE_SAME;
356 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
357 retval = diff_tree(&empty, &real, "", &revs->pruning);
358 free(tree);
359
360 return retval >= 0 && (tree_difference == REV_TREE_SAME);
361 }
362
363 static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
364 {
365 struct commit_list **pp, *parent;
366 int tree_changed = 0, tree_same = 0;
367
368 /*
369 * If we don't do pruning, everything is interesting
370 */
371 if (!revs->prune)
372 return;
373
374 if (!commit->tree)
375 return;
376
377 if (!commit->parents) {
378 if (rev_same_tree_as_empty(revs, commit))
379 commit->object.flags |= TREESAME;
380 return;
381 }
382
383 /*
384 * Normal non-merge commit? If we don't want to make the
385 * history dense, we consider it always to be a change..
386 */
387 if (!revs->dense && !commit->parents->next)
388 return;
389
390 pp = &commit->parents;
391 while ((parent = *pp) != NULL) {
392 struct commit *p = parent->item;
393
394 if (parse_commit(p) < 0)
395 die("cannot simplify commit %s (because of %s)",
396 sha1_to_hex(commit->object.sha1),
397 sha1_to_hex(p->object.sha1));
398 switch (rev_compare_tree(revs, p, commit)) {
399 case REV_TREE_SAME:
400 tree_same = 1;
401 if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
402 /* Even if a merge with an uninteresting
403 * side branch brought the entire change
404 * we are interested in, we do not want
405 * to lose the other branches of this
406 * merge, so we just keep going.
407 */
408 pp = &parent->next;
409 continue;
410 }
411 parent->next = NULL;
412 commit->parents = parent;
413 commit->object.flags |= TREESAME;
414 return;
415
416 case REV_TREE_NEW:
417 if (revs->remove_empty_trees &&
418 rev_same_tree_as_empty(revs, p)) {
419 /* We are adding all the specified
420 * paths from this parent, so the
421 * history beyond this parent is not
422 * interesting. Remove its parents
423 * (they are grandparents for us).
424 * IOW, we pretend this parent is a
425 * "root" commit.
426 */
427 if (parse_commit(p) < 0)
428 die("cannot simplify commit %s (invalid %s)",
429 sha1_to_hex(commit->object.sha1),
430 sha1_to_hex(p->object.sha1));
431 p->parents = NULL;
432 }
433 /* fallthrough */
434 case REV_TREE_OLD:
435 case REV_TREE_DIFFERENT:
436 tree_changed = 1;
437 pp = &parent->next;
438 continue;
439 }
440 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
441 }
442 if (tree_changed && !tree_same)
443 return;
444 commit->object.flags |= TREESAME;
445 }
446
447 static void insert_by_date_cached(struct commit *p, struct commit_list **head,
448 struct commit_list *cached_base, struct commit_list **cache)
449 {
450 struct commit_list *new_entry;
451
452 if (cached_base && p->date < cached_base->item->date)
453 new_entry = insert_by_date(p, &cached_base->next);
454 else
455 new_entry = insert_by_date(p, head);
456
457 if (cache && (!*cache || p->date < (*cache)->item->date))
458 *cache = new_entry;
459 }
460
461 static int add_parents_to_list(struct rev_info *revs, struct commit *commit,
462 struct commit_list **list, struct commit_list **cache_ptr)
463 {
464 struct commit_list *parent = commit->parents;
465 unsigned left_flag;
466 struct commit_list *cached_base = cache_ptr ? *cache_ptr : NULL;
467
468 if (commit->object.flags & ADDED)
469 return 0;
470 commit->object.flags |= ADDED;
471
472 /*
473 * If the commit is uninteresting, don't try to
474 * prune parents - we want the maximal uninteresting
475 * set.
476 *
477 * Normally we haven't parsed the parent
478 * yet, so we won't have a parent of a parent
479 * here. However, it may turn out that we've
480 * reached this commit some other way (where it
481 * wasn't uninteresting), in which case we need
482 * to mark its parents recursively too..
483 */
484 if (commit->object.flags & UNINTERESTING) {
485 while (parent) {
486 struct commit *p = parent->item;
487 parent = parent->next;
488 if (p)
489 p->object.flags |= UNINTERESTING;
490 if (parse_commit(p) < 0)
491 continue;
492 if (p->parents)
493 mark_parents_uninteresting(p);
494 if (p->object.flags & SEEN)
495 continue;
496 p->object.flags |= SEEN;
497 insert_by_date_cached(p, list, cached_base, cache_ptr);
498 }
499 return 0;
500 }
501
502 /*
503 * Ok, the commit wasn't uninteresting. Try to
504 * simplify the commit history and find the parent
505 * that has no differences in the path set if one exists.
506 */
507 try_to_simplify_commit(revs, commit);
508
509 if (revs->no_walk)
510 return 0;
511
512 left_flag = (commit->object.flags & SYMMETRIC_LEFT);
513
514 for (parent = commit->parents; parent; parent = parent->next) {
515 struct commit *p = parent->item;
516
517 if (parse_commit(p) < 0)
518 return -1;
519 if (revs->show_source && !p->util)
520 p->util = commit->util;
521 p->object.flags |= left_flag;
522 if (!(p->object.flags & SEEN)) {
523 p->object.flags |= SEEN;
524 insert_by_date_cached(p, list, cached_base, cache_ptr);
525 }
526 if (revs->first_parent_only)
527 break;
528 }
529 return 0;
530 }
531
532 static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
533 {
534 struct commit_list *p;
535 int left_count = 0, right_count = 0;
536 int left_first;
537 struct patch_ids ids;
538
539 /* First count the commits on the left and on the right */
540 for (p = list; p; p = p->next) {
541 struct commit *commit = p->item;
542 unsigned flags = commit->object.flags;
543 if (flags & BOUNDARY)
544 ;
545 else if (flags & SYMMETRIC_LEFT)
546 left_count++;
547 else
548 right_count++;
549 }
550
551 if (!left_count || !right_count)
552 return;
553
554 left_first = left_count < right_count;
555 init_patch_ids(&ids);
556 if (revs->diffopt.nr_paths) {
557 ids.diffopts.nr_paths = revs->diffopt.nr_paths;
558 ids.diffopts.paths = revs->diffopt.paths;
559 ids.diffopts.pathlens = revs->diffopt.pathlens;
560 }
561
562 /* Compute patch-ids for one side */
563 for (p = list; p; p = p->next) {
564 struct commit *commit = p->item;
565 unsigned flags = commit->object.flags;
566
567 if (flags & BOUNDARY)
568 continue;
569 /*
570 * If we have fewer left, left_first is set and we omit
571 * commits on the right branch in this loop. If we have
572 * fewer right, we skip the left ones.
573 */
574 if (left_first != !!(flags & SYMMETRIC_LEFT))
575 continue;
576 commit->util = add_commit_patch_id(commit, &ids);
577 }
578
579 /* Check the other side */
580 for (p = list; p; p = p->next) {
581 struct commit *commit = p->item;
582 struct patch_id *id;
583 unsigned flags = commit->object.flags;
584
585 if (flags & BOUNDARY)
586 continue;
587 /*
588 * If we have fewer left, left_first is set and we omit
589 * commits on the left branch in this loop.
590 */
591 if (left_first == !!(flags & SYMMETRIC_LEFT))
592 continue;
593
594 /*
595 * Have we seen the same patch id?
596 */
597 id = has_commit_patch_id(commit, &ids);
598 if (!id)
599 continue;
600 id->seen = 1;
601 commit->object.flags |= SHOWN;
602 }
603
604 /* Now check the original side for seen ones */
605 for (p = list; p; p = p->next) {
606 struct commit *commit = p->item;
607 struct patch_id *ent;
608
609 ent = commit->util;
610 if (!ent)
611 continue;
612 if (ent->seen)
613 commit->object.flags |= SHOWN;
614 commit->util = NULL;
615 }
616
617 free_patch_ids(&ids);
618 }
619
620 /* How many extra uninteresting commits we want to see.. */
621 #define SLOP 5
622
623 static int still_interesting(struct commit_list *src, unsigned long date, int slop)
624 {
625 /*
626 * No source list at all? We're definitely done..
627 */
628 if (!src)
629 return 0;
630
631 /*
632 * Does the destination list contain entries with a date
633 * before the source list? Definitely _not_ done.
634 */
635 if (date < src->item->date)
636 return SLOP;
637
638 /*
639 * Does the source list still have interesting commits in
640 * it? Definitely not done..
641 */
642 if (!everybody_uninteresting(src))
643 return SLOP;
644
645 /* Ok, we're closing in.. */
646 return slop-1;
647 }
648
649 /*
650 * "rev-list --ancestry-path A..B" computes commits that are ancestors
651 * of B but not ancestors of A but further limits the result to those
652 * that are descendants of A. This takes the list of bottom commits and
653 * the result of "A..B" without --ancestry-path, and limits the latter
654 * further to the ones that can reach one of the commits in "bottom".
655 */
656 static void limit_to_ancestry(struct commit_list *bottom, struct commit_list *list)
657 {
658 struct commit_list *p;
659 struct commit_list *rlist = NULL;
660 int made_progress;
661
662 /*
663 * Reverse the list so that it will be likely that we would
664 * process parents before children.
665 */
666 for (p = list; p; p = p->next)
667 commit_list_insert(p->item, &rlist);
668
669 for (p = bottom; p; p = p->next)
670 p->item->object.flags |= TMP_MARK;
671
672 /*
673 * Mark the ones that can reach bottom commits in "list",
674 * in a bottom-up fashion.
675 */
676 do {
677 made_progress = 0;
678 for (p = rlist; p; p = p->next) {
679 struct commit *c = p->item;
680 struct commit_list *parents;
681 if (c->object.flags & (TMP_MARK | UNINTERESTING))
682 continue;
683 for (parents = c->parents;
684 parents;
685 parents = parents->next) {
686 if (!(parents->item->object.flags & TMP_MARK))
687 continue;
688 c->object.flags |= TMP_MARK;
689 made_progress = 1;
690 break;
691 }
692 }
693 } while (made_progress);
694
695 /*
696 * NEEDSWORK: decide if we want to remove parents that are
697 * not marked with TMP_MARK from commit->parents for commits
698 * in the resulting list. We may not want to do that, though.
699 */
700
701 /*
702 * The ones that are not marked with TMP_MARK are uninteresting
703 */
704 for (p = list; p; p = p->next) {
705 struct commit *c = p->item;
706 if (c->object.flags & TMP_MARK)
707 continue;
708 c->object.flags |= UNINTERESTING;
709 }
710
711 /* We are done with the TMP_MARK */
712 for (p = list; p; p = p->next)
713 p->item->object.flags &= ~TMP_MARK;
714 for (p = bottom; p; p = p->next)
715 p->item->object.flags &= ~TMP_MARK;
716 free_commit_list(rlist);
717 }
718
719 /*
720 * Before walking the history, keep the set of "negative" refs the
721 * caller has asked to exclude.
722 *
723 * This is used to compute "rev-list --ancestry-path A..B", as we need
724 * to filter the result of "A..B" further to the ones that can actually
725 * reach A.
726 */
727 static struct commit_list *collect_bottom_commits(struct commit_list *list)
728 {
729 struct commit_list *elem, *bottom = NULL;
730 for (elem = list; elem; elem = elem->next)
731 if (elem->item->object.flags & UNINTERESTING)
732 commit_list_insert(elem->item, &bottom);
733 return bottom;
734 }
735
736 static int limit_list(struct rev_info *revs)
737 {
738 int slop = SLOP;
739 unsigned long date = ~0ul;
740 struct commit_list *list = revs->commits;
741 struct commit_list *newlist = NULL;
742 struct commit_list **p = &newlist;
743 struct commit_list *bottom = NULL;
744
745 if (revs->ancestry_path) {
746 bottom = collect_bottom_commits(list);
747 if (!bottom)
748 die("--ancestry-path given but there are no bottom commits");
749 }
750
751 while (list) {
752 struct commit_list *entry = list;
753 struct commit *commit = list->item;
754 struct object *obj = &commit->object;
755 show_early_output_fn_t show;
756
757 list = list->next;
758 free(entry);
759
760 if (revs->max_age != -1 && (commit->date < revs->max_age))
761 obj->flags |= UNINTERESTING;
762 if (add_parents_to_list(revs, commit, &list, NULL) < 0)
763 return -1;
764 if (obj->flags & UNINTERESTING) {
765 mark_parents_uninteresting(commit);
766 if (revs->show_all)
767 p = &commit_list_insert(commit, p)->next;
768 slop = still_interesting(list, date, slop);
769 if (slop)
770 continue;
771 /* If showing all, add the whole pending list to the end */
772 if (revs->show_all)
773 *p = list;
774 break;
775 }
776 if (revs->min_age != -1 && (commit->date > revs->min_age))
777 continue;
778 date = commit->date;
779 p = &commit_list_insert(commit, p)->next;
780
781 show = show_early_output;
782 if (!show)
783 continue;
784
785 show(revs, newlist);
786 show_early_output = NULL;
787 }
788 if (revs->cherry_pick)
789 cherry_pick_list(newlist, revs);
790
791 if (bottom) {
792 limit_to_ancestry(bottom, newlist);
793 free_commit_list(bottom);
794 }
795
796 revs->commits = newlist;
797 return 0;
798 }
799
800 struct all_refs_cb {
801 int all_flags;
802 int warned_bad_reflog;
803 struct rev_info *all_revs;
804 const char *name_for_errormsg;
805 };
806
807 static int handle_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
808 {
809 struct all_refs_cb *cb = cb_data;
810 struct object *object = get_reference(cb->all_revs, path, sha1,
811 cb->all_flags);
812 add_pending_object(cb->all_revs, object, path);
813 return 0;
814 }
815
816 static void init_all_refs_cb(struct all_refs_cb *cb, struct rev_info *revs,
817 unsigned flags)
818 {
819 cb->all_revs = revs;
820 cb->all_flags = flags;
821 }
822
823 static void handle_refs(const char *submodule, struct rev_info *revs, unsigned flags,
824 int (*for_each)(const char *, each_ref_fn, void *))
825 {
826 struct all_refs_cb cb;
827 init_all_refs_cb(&cb, revs, flags);
828 for_each(submodule, handle_one_ref, &cb);
829 }
830
831 static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
832 {
833 struct all_refs_cb *cb = cb_data;
834 if (!is_null_sha1(sha1)) {
835 struct object *o = parse_object(sha1);
836 if (o) {
837 o->flags |= cb->all_flags;
838 add_pending_object(cb->all_revs, o, "");
839 }
840 else if (!cb->warned_bad_reflog) {
841 warning("reflog of '%s' references pruned commits",
842 cb->name_for_errormsg);
843 cb->warned_bad_reflog = 1;
844 }
845 }
846 }
847
848 static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
849 const char *email, unsigned long timestamp, int tz,
850 const char *message, void *cb_data)
851 {
852 handle_one_reflog_commit(osha1, cb_data);
853 handle_one_reflog_commit(nsha1, cb_data);
854 return 0;
855 }
856
857 static int handle_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
858 {
859 struct all_refs_cb *cb = cb_data;
860 cb->warned_bad_reflog = 0;
861 cb->name_for_errormsg = path;
862 for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
863 return 0;
864 }
865
866 static void handle_reflog(struct rev_info *revs, unsigned flags)
867 {
868 struct all_refs_cb cb;
869 cb.all_revs = revs;
870 cb.all_flags = flags;
871 for_each_reflog(handle_one_reflog, &cb);
872 }
873
874 static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
875 {
876 unsigned char sha1[20];
877 struct object *it;
878 struct commit *commit;
879 struct commit_list *parents;
880
881 if (*arg == '^') {
882 flags ^= UNINTERESTING;
883 arg++;
884 }
885 if (get_sha1(arg, sha1))
886 return 0;
887 while (1) {
888 it = get_reference(revs, arg, sha1, 0);
889 if (it->type != OBJ_TAG)
890 break;
891 if (!((struct tag*)it)->tagged)
892 return 0;
893 hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
894 }
895 if (it->type != OBJ_COMMIT)
896 return 0;
897 commit = (struct commit *)it;
898 for (parents = commit->parents; parents; parents = parents->next) {
899 it = &parents->item->object;
900 it->flags |= flags;
901 add_pending_object(revs, it, arg);
902 }
903 return 1;
904 }
905
906 void init_revisions(struct rev_info *revs, const char *prefix)
907 {
908 memset(revs, 0, sizeof(*revs));
909
910 revs->abbrev = DEFAULT_ABBREV;
911 revs->ignore_merges = 1;
912 revs->simplify_history = 1;
913 DIFF_OPT_SET(&revs->pruning, RECURSIVE);
914 DIFF_OPT_SET(&revs->pruning, QUICK);
915 revs->pruning.add_remove = file_add_remove;
916 revs->pruning.change = file_change;
917 revs->lifo = 1;
918 revs->dense = 1;
919 revs->prefix = prefix;
920 revs->max_age = -1;
921 revs->min_age = -1;
922 revs->skip_count = -1;
923 revs->max_count = -1;
924
925 revs->commit_format = CMIT_FMT_DEFAULT;
926
927 revs->grep_filter.status_only = 1;
928 revs->grep_filter.pattern_tail = &(revs->grep_filter.pattern_list);
929 revs->grep_filter.header_tail = &(revs->grep_filter.header_list);
930 revs->grep_filter.regflags = REG_NEWLINE;
931
932 diff_setup(&revs->diffopt);
933 if (prefix && !revs->diffopt.prefix) {
934 revs->diffopt.prefix = prefix;
935 revs->diffopt.prefix_length = strlen(prefix);
936 }
937 }
938
939 static void add_pending_commit_list(struct rev_info *revs,
940 struct commit_list *commit_list,
941 unsigned int flags)
942 {
943 while (commit_list) {
944 struct object *object = &commit_list->item->object;
945 object->flags |= flags;
946 add_pending_object(revs, object, sha1_to_hex(object->sha1));
947 commit_list = commit_list->next;
948 }
949 }
950
951 static void prepare_show_merge(struct rev_info *revs)
952 {
953 struct commit_list *bases;
954 struct commit *head, *other;
955 unsigned char sha1[20];
956 const char **prune = NULL;
957 int i, prune_num = 1; /* counting terminating NULL */
958
959 if (get_sha1("HEAD", sha1) || !(head = lookup_commit(sha1)))
960 die("--merge without HEAD?");
961 if (get_sha1("MERGE_HEAD", sha1) || !(other = lookup_commit(sha1)))
962 die("--merge without MERGE_HEAD?");
963 add_pending_object(revs, &head->object, "HEAD");
964 add_pending_object(revs, &other->object, "MERGE_HEAD");
965 bases = get_merge_bases(head, other, 1);
966 add_pending_commit_list(revs, bases, UNINTERESTING);
967 free_commit_list(bases);
968 head->object.flags |= SYMMETRIC_LEFT;
969
970 if (!active_nr)
971 read_cache();
972 for (i = 0; i < active_nr; i++) {
973 struct cache_entry *ce = active_cache[i];
974 if (!ce_stage(ce))
975 continue;
976 if (ce_path_match(ce, revs->prune_data)) {
977 prune_num++;
978 prune = xrealloc(prune, sizeof(*prune) * prune_num);
979 prune[prune_num-2] = ce->name;
980 prune[prune_num-1] = NULL;
981 }
982 while ((i+1 < active_nr) &&
983 ce_same_name(ce, active_cache[i+1]))
984 i++;
985 }
986 revs->prune_data = prune;
987 revs->limited = 1;
988 }
989
990 int handle_revision_arg(const char *arg, struct rev_info *revs,
991 int flags,
992 int cant_be_filename)
993 {
994 unsigned mode;
995 char *dotdot;
996 struct object *object;
997 unsigned char sha1[20];
998 int local_flags;
999
1000 dotdot = strstr(arg, "..");
1001 if (dotdot) {
1002 unsigned char from_sha1[20];
1003 const char *next = dotdot + 2;
1004 const char *this = arg;
1005 int symmetric = *next == '.';
1006 unsigned int flags_exclude = flags ^ UNINTERESTING;
1007
1008 *dotdot = 0;
1009 next += symmetric;
1010
1011 if (!*next)
1012 next = "HEAD";
1013 if (dotdot == arg)
1014 this = "HEAD";
1015 if (!get_sha1(this, from_sha1) &&
1016 !get_sha1(next, sha1)) {
1017 struct commit *a, *b;
1018 struct commit_list *exclude;
1019
1020 a = lookup_commit_reference(from_sha1);
1021 b = lookup_commit_reference(sha1);
1022 if (!a || !b) {
1023 die(symmetric ?
1024 "Invalid symmetric difference expression %s...%s" :
1025 "Invalid revision range %s..%s",
1026 arg, next);
1027 }
1028
1029 if (!cant_be_filename) {
1030 *dotdot = '.';
1031 verify_non_filename(revs->prefix, arg);
1032 }
1033
1034 if (symmetric) {
1035 exclude = get_merge_bases(a, b, 1);
1036 add_pending_commit_list(revs, exclude,
1037 flags_exclude);
1038 free_commit_list(exclude);
1039 a->object.flags |= flags | SYMMETRIC_LEFT;
1040 } else
1041 a->object.flags |= flags_exclude;
1042 b->object.flags |= flags;
1043 add_pending_object(revs, &a->object, this);
1044 add_pending_object(revs, &b->object, next);
1045 return 0;
1046 }
1047 *dotdot = '.';
1048 }
1049 dotdot = strstr(arg, "^@");
1050 if (dotdot && !dotdot[2]) {
1051 *dotdot = 0;
1052 if (add_parents_only(revs, arg, flags))
1053 return 0;
1054 *dotdot = '^';
1055 }
1056 dotdot = strstr(arg, "^!");
1057 if (dotdot && !dotdot[2]) {
1058 *dotdot = 0;
1059 if (!add_parents_only(revs, arg, flags ^ UNINTERESTING))
1060 *dotdot = '^';
1061 }
1062
1063 local_flags = 0;
1064 if (*arg == '^') {
1065 local_flags = UNINTERESTING;
1066 arg++;
1067 }
1068 if (get_sha1_with_mode(arg, sha1, &mode))
1069 return -1;
1070 if (!cant_be_filename)
1071 verify_non_filename(revs->prefix, arg);
1072 object = get_reference(revs, arg, sha1, flags ^ local_flags);
1073 add_pending_object_with_mode(revs, object, arg, mode);
1074 return 0;
1075 }
1076
1077 static void read_pathspec_from_stdin(struct rev_info *revs, struct strbuf *sb, const char ***prune_data)
1078 {
1079 const char **prune = *prune_data;
1080 int prune_nr;
1081 int prune_alloc;
1082
1083 /* count existing ones */
1084 if (!prune)
1085 prune_nr = 0;
1086 else
1087 for (prune_nr = 0; prune[prune_nr]; prune_nr++)
1088 ;
1089 prune_alloc = prune_nr; /* not really, but we do not know */
1090
1091 while (strbuf_getwholeline(sb, stdin, '\n') != EOF) {
1092 int len = sb->len;
1093 if (len && sb->buf[len - 1] == '\n')
1094 sb->buf[--len] = '\0';
1095 ALLOC_GROW(prune, prune_nr+1, prune_alloc);
1096 prune[prune_nr++] = xstrdup(sb->buf);
1097 }
1098 if (prune) {
1099 ALLOC_GROW(prune, prune_nr+1, prune_alloc);
1100 prune[prune_nr] = NULL;
1101 }
1102 *prune_data = prune;
1103 }
1104
1105 static void read_revisions_from_stdin(struct rev_info *revs, const char ***prune)
1106 {
1107 struct strbuf sb;
1108 int seen_dashdash = 0;
1109
1110 strbuf_init(&sb, 1000);
1111 while (strbuf_getwholeline(&sb, stdin, '\n') != EOF) {
1112 int len = sb.len;
1113 if (len && sb.buf[len - 1] == '\n')
1114 sb.buf[--len] = '\0';
1115 if (!len)
1116 break;
1117 if (sb.buf[0] == '-') {
1118 if (len == 2 && sb.buf[1] == '-') {
1119 seen_dashdash = 1;
1120 break;
1121 }
1122 die("options not supported in --stdin mode");
1123 }
1124 if (handle_revision_arg(sb.buf, revs, 0, 1))
1125 die("bad revision '%s'", sb.buf);
1126 }
1127 if (seen_dashdash)
1128 read_pathspec_from_stdin(revs, &sb, prune);
1129 strbuf_release(&sb);
1130 }
1131
1132 static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
1133 {
1134 append_grep_pattern(&revs->grep_filter, ptn, "command line", 0, what);
1135 }
1136
1137 static void add_header_grep(struct rev_info *revs, enum grep_header_field field, const char *pattern)
1138 {
1139 append_header_grep_pattern(&revs->grep_filter, field, pattern);
1140 }
1141
1142 static void add_message_grep(struct rev_info *revs, const char *pattern)
1143 {
1144 add_grep(revs, pattern, GREP_PATTERN_BODY);
1145 }
1146
1147 static int handle_revision_opt(struct rev_info *revs, int argc, const char **argv,
1148 int *unkc, const char **unkv)
1149 {
1150 const char *arg = argv[0];
1151
1152 /* pseudo revision arguments */
1153 if (!strcmp(arg, "--all") || !strcmp(arg, "--branches") ||
1154 !strcmp(arg, "--tags") || !strcmp(arg, "--remotes") ||
1155 !strcmp(arg, "--reflog") || !strcmp(arg, "--not") ||
1156 !strcmp(arg, "--no-walk") || !strcmp(arg, "--do-walk") ||
1157 !strcmp(arg, "--bisect"))
1158 {
1159 unkv[(*unkc)++] = arg;
1160 return 1;
1161 }
1162
1163 if (!prefixcmp(arg, "--max-count=")) {
1164 revs->max_count = atoi(arg + 12);
1165 revs->no_walk = 0;
1166 } else if (!prefixcmp(arg, "--skip=")) {
1167 revs->skip_count = atoi(arg + 7);
1168 } else if ((*arg == '-') && isdigit(arg[1])) {
1169 /* accept -<digit>, like traditional "head" */
1170 revs->max_count = atoi(arg + 1);
1171 revs->no_walk = 0;
1172 } else if (!strcmp(arg, "-n")) {
1173 if (argc <= 1)
1174 return error("-n requires an argument");
1175 revs->max_count = atoi(argv[1]);
1176 revs->no_walk = 0;
1177 return 2;
1178 } else if (!prefixcmp(arg, "-n")) {
1179 revs->max_count = atoi(arg + 2);
1180 revs->no_walk = 0;
1181 } else if (!prefixcmp(arg, "--max-age=")) {
1182 revs->max_age = atoi(arg + 10);
1183 } else if (!prefixcmp(arg, "--since=")) {
1184 revs->max_age = approxidate(arg + 8);
1185 } else if (!prefixcmp(arg, "--after=")) {
1186 revs->max_age = approxidate(arg + 8);
1187 } else if (!prefixcmp(arg, "--min-age=")) {
1188 revs->min_age = atoi(arg + 10);
1189 } else if (!prefixcmp(arg, "--before=")) {
1190 revs->min_age = approxidate(arg + 9);
1191 } else if (!prefixcmp(arg, "--until=")) {
1192 revs->min_age = approxidate(arg + 8);
1193 } else if (!strcmp(arg, "--first-parent")) {
1194 revs->first_parent_only = 1;
1195 } else if (!strcmp(arg, "--ancestry-path")) {
1196 revs->ancestry_path = 1;
1197 revs->simplify_history = 0;
1198 revs->limited = 1;
1199 } else if (!strcmp(arg, "-g") || !strcmp(arg, "--walk-reflogs")) {
1200 init_reflog_walk(&revs->reflog_info);
1201 } else if (!strcmp(arg, "--default")) {
1202 if (argc <= 1)
1203 return error("bad --default argument");
1204 revs->def = argv[1];
1205 return 2;
1206 } else if (!strcmp(arg, "--merge")) {
1207 revs->show_merge = 1;
1208 } else if (!strcmp(arg, "--topo-order")) {
1209 revs->lifo = 1;
1210 revs->topo_order = 1;
1211 } else if (!strcmp(arg, "--simplify-merges")) {
1212 revs->simplify_merges = 1;
1213 revs->rewrite_parents = 1;
1214 revs->simplify_history = 0;
1215 revs->limited = 1;
1216 } else if (!strcmp(arg, "--simplify-by-decoration")) {
1217 revs->simplify_merges = 1;
1218 revs->rewrite_parents = 1;
1219 revs->simplify_history = 0;
1220 revs->simplify_by_decoration = 1;
1221 revs->limited = 1;
1222 revs->prune = 1;
1223 load_ref_decorations(DECORATE_SHORT_REFS);
1224 } else if (!strcmp(arg, "--date-order")) {
1225 revs->lifo = 0;
1226 revs->topo_order = 1;
1227 } else if (!prefixcmp(arg, "--early-output")) {
1228 int count = 100;
1229 switch (arg[14]) {
1230 case '=':
1231 count = atoi(arg+15);
1232 /* Fallthrough */
1233 case 0:
1234 revs->topo_order = 1;
1235 revs->early_output = count;
1236 }
1237 } else if (!strcmp(arg, "--parents")) {
1238 revs->rewrite_parents = 1;
1239 revs->print_parents = 1;
1240 } else if (!strcmp(arg, "--dense")) {
1241 revs->dense = 1;
1242 } else if (!strcmp(arg, "--sparse")) {
1243 revs->dense = 0;
1244 } else if (!strcmp(arg, "--show-all")) {
1245 revs->show_all = 1;
1246 } else if (!strcmp(arg, "--remove-empty")) {
1247 revs->remove_empty_trees = 1;
1248 } else if (!strcmp(arg, "--merges")) {
1249 revs->merges_only = 1;
1250 } else if (!strcmp(arg, "--no-merges")) {
1251 revs->no_merges = 1;
1252 } else if (!strcmp(arg, "--boundary")) {
1253 revs->boundary = 1;
1254 } else if (!strcmp(arg, "--left-right")) {
1255 revs->left_right = 1;
1256 } else if (!strcmp(arg, "--count")) {
1257 revs->count = 1;
1258 } else if (!strcmp(arg, "--cherry-pick")) {
1259 revs->cherry_pick = 1;
1260 revs->limited = 1;
1261 } else if (!strcmp(arg, "--objects")) {
1262 revs->tag_objects = 1;
1263 revs->tree_objects = 1;
1264 revs->blob_objects = 1;
1265 } else if (!strcmp(arg, "--objects-edge")) {
1266 revs->tag_objects = 1;
1267 revs->tree_objects = 1;
1268 revs->blob_objects = 1;
1269 revs->edge_hint = 1;
1270 } else if (!strcmp(arg, "--unpacked")) {
1271 revs->unpacked = 1;
1272 } else if (!prefixcmp(arg, "--unpacked=")) {
1273 die("--unpacked=<packfile> no longer supported.");
1274 } else if (!strcmp(arg, "-r")) {
1275 revs->diff = 1;
1276 DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
1277 } else if (!strcmp(arg, "-t")) {
1278 revs->diff = 1;
1279 DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
1280 DIFF_OPT_SET(&revs->diffopt, TREE_IN_RECURSIVE);
1281 } else if (!strcmp(arg, "-m")) {
1282 revs->ignore_merges = 0;
1283 } else if (!strcmp(arg, "-c")) {
1284 revs->diff = 1;
1285 revs->dense_combined_merges = 0;
1286 revs->combine_merges = 1;
1287 } else if (!strcmp(arg, "--cc")) {
1288 revs->diff = 1;
1289 revs->dense_combined_merges = 1;
1290 revs->combine_merges = 1;
1291 } else if (!strcmp(arg, "-v")) {
1292 revs->verbose_header = 1;
1293 } else if (!strcmp(arg, "--pretty")) {
1294 revs->verbose_header = 1;
1295 revs->pretty_given = 1;
1296 get_commit_format(arg+8, revs);
1297 } else if (!prefixcmp(arg, "--pretty=") || !prefixcmp(arg, "--format=")) {
1298 revs->verbose_header = 1;
1299 revs->pretty_given = 1;
1300 get_commit_format(arg+9, revs);
1301 } else if (!strcmp(arg, "--show-notes")) {
1302 revs->show_notes = 1;
1303 revs->show_notes_given = 1;
1304 } else if (!prefixcmp(arg, "--show-notes=")) {
1305 struct strbuf buf = STRBUF_INIT;
1306 revs->show_notes = 1;
1307 revs->show_notes_given = 1;
1308 if (!revs->notes_opt.extra_notes_refs)
1309 revs->notes_opt.extra_notes_refs = xcalloc(1, sizeof(struct string_list));
1310 if (!prefixcmp(arg+13, "refs/"))
1311 /* happy */;
1312 else if (!prefixcmp(arg+13, "notes/"))
1313 strbuf_addstr(&buf, "refs/");
1314 else
1315 strbuf_addstr(&buf, "refs/notes/");
1316 strbuf_addstr(&buf, arg+13);
1317 string_list_append(revs->notes_opt.extra_notes_refs,
1318 strbuf_detach(&buf, NULL));
1319 } else if (!strcmp(arg, "--no-notes")) {
1320 revs->show_notes = 0;
1321 revs->show_notes_given = 1;
1322 } else if (!strcmp(arg, "--standard-notes")) {
1323 revs->show_notes_given = 1;
1324 revs->notes_opt.suppress_default_notes = 0;
1325 } else if (!strcmp(arg, "--no-standard-notes")) {
1326 revs->notes_opt.suppress_default_notes = 1;
1327 } else if (!strcmp(arg, "--oneline")) {
1328 revs->verbose_header = 1;
1329 get_commit_format("oneline", revs);
1330 revs->pretty_given = 1;
1331 revs->abbrev_commit = 1;
1332 } else if (!strcmp(arg, "--graph")) {
1333 revs->topo_order = 1;
1334 revs->rewrite_parents = 1;
1335 revs->graph = graph_init(revs);
1336 } else if (!strcmp(arg, "--root")) {
1337 revs->show_root_diff = 1;
1338 } else if (!strcmp(arg, "--no-commit-id")) {
1339 revs->no_commit_id = 1;
1340 } else if (!strcmp(arg, "--always")) {
1341 revs->always_show_header = 1;
1342 } else if (!strcmp(arg, "--no-abbrev")) {
1343 revs->abbrev = 0;
1344 } else if (!strcmp(arg, "--abbrev")) {
1345 revs->abbrev = DEFAULT_ABBREV;
1346 } else if (!prefixcmp(arg, "--abbrev=")) {
1347 revs->abbrev = strtoul(arg + 9, NULL, 10);
1348 if (revs->abbrev < MINIMUM_ABBREV)
1349 revs->abbrev = MINIMUM_ABBREV;
1350 else if (revs->abbrev > 40)
1351 revs->abbrev = 40;
1352 } else if (!strcmp(arg, "--abbrev-commit")) {
1353 revs->abbrev_commit = 1;
1354 } else if (!strcmp(arg, "--full-diff")) {
1355 revs->diff = 1;
1356 revs->full_diff = 1;
1357 } else if (!strcmp(arg, "--full-history")) {
1358 revs->simplify_history = 0;
1359 } else if (!strcmp(arg, "--relative-date")) {
1360 revs->date_mode = DATE_RELATIVE;
1361 revs->date_mode_explicit = 1;
1362 } else if (!strncmp(arg, "--date=", 7)) {
1363 revs->date_mode = parse_date_format(arg + 7);
1364 revs->date_mode_explicit = 1;
1365 } else if (!strcmp(arg, "--log-size")) {
1366 revs->show_log_size = 1;
1367 }
1368 /*
1369 * Grepping the commit log
1370 */
1371 else if (!prefixcmp(arg, "--author=")) {
1372 add_header_grep(revs, GREP_HEADER_AUTHOR, arg+9);
1373 } else if (!prefixcmp(arg, "--committer=")) {
1374 add_header_grep(revs, GREP_HEADER_COMMITTER, arg+12);
1375 } else if (!prefixcmp(arg, "--grep=")) {
1376 add_message_grep(revs, arg+7);
1377 } else if (!strcmp(arg, "--extended-regexp") || !strcmp(arg, "-E")) {
1378 revs->grep_filter.regflags |= REG_EXTENDED;
1379 } else if (!strcmp(arg, "--regexp-ignore-case") || !strcmp(arg, "-i")) {
1380 revs->grep_filter.regflags |= REG_ICASE;
1381 } else if (!strcmp(arg, "--fixed-strings") || !strcmp(arg, "-F")) {
1382 revs->grep_filter.fixed = 1;
1383 } else if (!strcmp(arg, "--all-match")) {
1384 revs->grep_filter.all_match = 1;
1385 } else if (!prefixcmp(arg, "--encoding=")) {
1386 arg += 11;
1387 if (strcmp(arg, "none"))
1388 git_log_output_encoding = xstrdup(arg);
1389 else
1390 git_log_output_encoding = "";
1391 } else if (!strcmp(arg, "--reverse")) {
1392 revs->reverse ^= 1;
1393 } else if (!strcmp(arg, "--children")) {
1394 revs->children.name = "children";
1395 revs->limited = 1;
1396 } else {
1397 int opts = diff_opt_parse(&revs->diffopt, argv, argc);
1398 if (!opts)
1399 unkv[(*unkc)++] = arg;
1400 return opts;
1401 }
1402
1403 return 1;
1404 }
1405
1406 void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
1407 const struct option *options,
1408 const char * const usagestr[])
1409 {
1410 int n = handle_revision_opt(revs, ctx->argc, ctx->argv,
1411 &ctx->cpidx, ctx->out);
1412 if (n <= 0) {
1413 error("unknown option `%s'", ctx->argv[0]);
1414 usage_with_options(usagestr, options);
1415 }
1416 ctx->argv += n;
1417 ctx->argc -= n;
1418 }
1419
1420 static int for_each_bad_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data)
1421 {
1422 return for_each_ref_in_submodule(submodule, "refs/bisect/bad", fn, cb_data);
1423 }
1424
1425 static int for_each_good_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data)
1426 {
1427 return for_each_ref_in_submodule(submodule, "refs/bisect/good", fn, cb_data);
1428 }
1429
1430 static void append_prune_data(const char ***prune_data, const char **av)
1431 {
1432 const char **prune = *prune_data;
1433 int prune_nr;
1434 int prune_alloc;
1435
1436 if (!prune) {
1437 *prune_data = av;
1438 return;
1439 }
1440
1441 /* count existing ones */
1442 for (prune_nr = 0; prune[prune_nr]; prune_nr++)
1443 ;
1444 prune_alloc = prune_nr; /* not really, but we do not know */
1445
1446 while (*av) {
1447 ALLOC_GROW(prune, prune_nr+1, prune_alloc);
1448 prune[prune_nr++] = *av;
1449 av++;
1450 }
1451 if (prune) {
1452 ALLOC_GROW(prune, prune_nr+1, prune_alloc);
1453 prune[prune_nr] = NULL;
1454 }
1455 *prune_data = prune;
1456 }
1457
1458 /*
1459 * Parse revision information, filling in the "rev_info" structure,
1460 * and removing the used arguments from the argument list.
1461 *
1462 * Returns the number of arguments left that weren't recognized
1463 * (which are also moved to the head of the argument list)
1464 */
1465 int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct setup_revision_opt *opt)
1466 {
1467 int i, flags, left, seen_dashdash, read_from_stdin, got_rev_arg = 0;
1468 const char **prune_data = NULL;
1469 const char *submodule = NULL;
1470
1471 if (opt)
1472 submodule = opt->submodule;
1473
1474 /* First, search for "--" */
1475 seen_dashdash = 0;
1476 for (i = 1; i < argc; i++) {
1477 const char *arg = argv[i];
1478 if (strcmp(arg, "--"))
1479 continue;
1480 argv[i] = NULL;
1481 argc = i;
1482 if (argv[i + 1])
1483 prune_data = argv + i + 1;
1484 seen_dashdash = 1;
1485 break;
1486 }
1487
1488 /* Second, deal with arguments and options */
1489 flags = 0;
1490 read_from_stdin = 0;
1491 for (left = i = 1; i < argc; i++) {
1492 const char *arg = argv[i];
1493 if (*arg == '-') {
1494 int opts;
1495
1496 if (!strcmp(arg, "--all")) {
1497 handle_refs(submodule, revs, flags, for_each_ref_submodule);
1498 handle_refs(submodule, revs, flags, head_ref_submodule);
1499 continue;
1500 }
1501 if (!strcmp(arg, "--branches")) {
1502 handle_refs(submodule, revs, flags, for_each_branch_ref_submodule);
1503 continue;
1504 }
1505 if (!strcmp(arg, "--bisect")) {
1506 handle_refs(submodule, revs, flags, for_each_bad_bisect_ref);
1507 handle_refs(submodule, revs, flags ^ UNINTERESTING, for_each_good_bisect_ref);
1508 revs->bisect = 1;
1509 continue;
1510 }
1511 if (!strcmp(arg, "--tags")) {
1512 handle_refs(submodule, revs, flags, for_each_tag_ref_submodule);
1513 continue;
1514 }
1515 if (!strcmp(arg, "--remotes")) {
1516 handle_refs(submodule, revs, flags, for_each_remote_ref_submodule);
1517 continue;
1518 }
1519 if (!prefixcmp(arg, "--glob=")) {
1520 struct all_refs_cb cb;
1521 init_all_refs_cb(&cb, revs, flags);
1522 for_each_glob_ref(handle_one_ref, arg + 7, &cb);
1523 continue;
1524 }
1525 if (!prefixcmp(arg, "--branches=")) {
1526 struct all_refs_cb cb;
1527 init_all_refs_cb(&cb, revs, flags);
1528 for_each_glob_ref_in(handle_one_ref, arg + 11, "refs/heads/", &cb);
1529 continue;
1530 }
1531 if (!prefixcmp(arg, "--tags=")) {
1532 struct all_refs_cb cb;
1533 init_all_refs_cb(&cb, revs, flags);
1534 for_each_glob_ref_in(handle_one_ref, arg + 7, "refs/tags/", &cb);
1535 continue;
1536 }
1537 if (!prefixcmp(arg, "--remotes=")) {
1538 struct all_refs_cb cb;
1539 init_all_refs_cb(&cb, revs, flags);
1540 for_each_glob_ref_in(handle_one_ref, arg + 10, "refs/remotes/", &cb);
1541 continue;
1542 }
1543 if (!strcmp(arg, "--reflog")) {
1544 handle_reflog(revs, flags);
1545 continue;
1546 }
1547 if (!strcmp(arg, "--not")) {
1548 flags ^= UNINTERESTING;
1549 continue;
1550 }
1551 if (!strcmp(arg, "--no-walk")) {
1552 revs->no_walk = 1;
1553 continue;
1554 }
1555 if (!strcmp(arg, "--do-walk")) {
1556 revs->no_walk = 0;
1557 continue;
1558 }
1559 if (!strcmp(arg, "--stdin")) {
1560 if (revs->disable_stdin) {
1561 argv[left++] = arg;
1562 continue;
1563 }
1564 if (read_from_stdin++)
1565 die("--stdin given twice?");
1566 read_revisions_from_stdin(revs, &prune_data);
1567 continue;
1568 }
1569
1570 opts = handle_revision_opt(revs, argc - i, argv + i, &left, argv);
1571 if (opts > 0) {
1572 i += opts - 1;
1573 continue;
1574 }
1575 if (opts < 0)
1576 exit(128);
1577 continue;
1578 }
1579
1580 if (handle_revision_arg(arg, revs, flags, seen_dashdash)) {
1581 int j;
1582 if (seen_dashdash || *arg == '^')
1583 die("bad revision '%s'", arg);
1584
1585 /* If we didn't have a "--":
1586 * (1) all filenames must exist;
1587 * (2) all rev-args must not be interpretable
1588 * as a valid filename.
1589 * but the latter we have checked in the main loop.
1590 */
1591 for (j = i; j < argc; j++)
1592 verify_filename(revs->prefix, argv[j]);
1593
1594 append_prune_data(&prune_data, argv + i);
1595 break;
1596 }
1597 else
1598 got_rev_arg = 1;
1599 }
1600
1601 if (prune_data)
1602 revs->prune_data = get_pathspec(revs->prefix, prune_data);
1603
1604 if (revs->def == NULL)
1605 revs->def = opt ? opt->def : NULL;
1606 if (opt && opt->tweak)
1607 opt->tweak(revs, opt);
1608 if (revs->show_merge)
1609 prepare_show_merge(revs);
1610 if (revs->def && !revs->pending.nr && !got_rev_arg) {
1611 unsigned char sha1[20];
1612 struct object *object;
1613 unsigned mode;
1614 if (get_sha1_with_mode(revs->def, sha1, &mode))
1615 die("bad default revision '%s'", revs->def);
1616 object = get_reference(revs, revs->def, sha1, 0);
1617 add_pending_object_with_mode(revs, object, revs->def, mode);
1618 }
1619
1620 /* Did the user ask for any diff output? Run the diff! */
1621 if (revs->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT)
1622 revs->diff = 1;
1623
1624 /* Pickaxe, diff-filter and rename following need diffs */
1625 if (revs->diffopt.pickaxe ||
1626 revs->diffopt.filter ||
1627 DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
1628 revs->diff = 1;
1629
1630 if (revs->topo_order)
1631 revs->limited = 1;
1632
1633 if (revs->prune_data) {
1634 diff_tree_setup_paths(revs->prune_data, &revs->pruning);
1635 /* Can't prune commits with rename following: the paths change.. */
1636 if (!DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
1637 revs->prune = 1;
1638 if (!revs->full_diff)
1639 diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
1640 }
1641 if (revs->combine_merges)
1642 revs->ignore_merges = 0;
1643 revs->diffopt.abbrev = revs->abbrev;
1644 if (diff_setup_done(&revs->diffopt) < 0)
1645 die("diff_setup_done failed");
1646
1647 compile_grep_patterns(&revs->grep_filter);
1648
1649 if (revs->reverse && revs->reflog_info)
1650 die("cannot combine --reverse with --walk-reflogs");
1651 if (revs->rewrite_parents && revs->children.name)
1652 die("cannot combine --parents and --children");
1653
1654 /*
1655 * Limitations on the graph functionality
1656 */
1657 if (revs->reverse && revs->graph)
1658 die("cannot combine --reverse with --graph");
1659
1660 if (revs->reflog_info && revs->graph)
1661 die("cannot combine --walk-reflogs with --graph");
1662
1663 return left;
1664 }
1665
1666 static void add_child(struct rev_info *revs, struct commit *parent, struct commit *child)
1667 {
1668 struct commit_list *l = xcalloc(1, sizeof(*l));
1669
1670 l->item = child;
1671 l->next = add_decoration(&revs->children, &parent->object, l);
1672 }
1673
1674 static int remove_duplicate_parents(struct commit *commit)
1675 {
1676 struct commit_list **pp, *p;
1677 int surviving_parents;
1678
1679 /* Examine existing parents while marking ones we have seen... */
1680 pp = &commit->parents;
1681 while ((p = *pp) != NULL) {
1682 struct commit *parent = p->item;
1683 if (parent->object.flags & TMP_MARK) {
1684 *pp = p->next;
1685 continue;
1686 }
1687 parent->object.flags |= TMP_MARK;
1688 pp = &p->next;
1689 }
1690 /* count them while clearing the temporary mark */
1691 surviving_parents = 0;
1692 for (p = commit->parents; p; p = p->next) {
1693 p->item->object.flags &= ~TMP_MARK;
1694 surviving_parents++;
1695 }
1696 return surviving_parents;
1697 }
1698
1699 struct merge_simplify_state {
1700 struct commit *simplified;
1701 };
1702
1703 static struct merge_simplify_state *locate_simplify_state(struct rev_info *revs, struct commit *commit)
1704 {
1705 struct merge_simplify_state *st;
1706
1707 st = lookup_decoration(&revs->merge_simplification, &commit->object);
1708 if (!st) {
1709 st = xcalloc(1, sizeof(*st));
1710 add_decoration(&revs->merge_simplification, &commit->object, st);
1711 }
1712 return st;
1713 }
1714
1715 static struct commit_list **simplify_one(struct rev_info *revs, struct commit *commit, struct commit_list **tail)
1716 {
1717 struct commit_list *p;
1718 struct merge_simplify_state *st, *pst;
1719 int cnt;
1720
1721 st = locate_simplify_state(revs, commit);
1722
1723 /*
1724 * Have we handled this one?
1725 */
1726 if (st->simplified)
1727 return tail;
1728
1729 /*
1730 * An UNINTERESTING commit simplifies to itself, so does a
1731 * root commit. We do not rewrite parents of such commit
1732 * anyway.
1733 */
1734 if ((commit->object.flags & UNINTERESTING) || !commit->parents) {
1735 st->simplified = commit;
1736 return tail;
1737 }
1738
1739 /*
1740 * Do we know what commit all of our parents should be rewritten to?
1741 * Otherwise we are not ready to rewrite this one yet.
1742 */
1743 for (cnt = 0, p = commit->parents; p; p = p->next) {
1744 pst = locate_simplify_state(revs, p->item);
1745 if (!pst->simplified) {
1746 tail = &commit_list_insert(p->item, tail)->next;
1747 cnt++;
1748 }
1749 }
1750 if (cnt) {
1751 tail = &commit_list_insert(commit, tail)->next;
1752 return tail;
1753 }
1754
1755 /*
1756 * Rewrite our list of parents.
1757 */
1758 for (p = commit->parents; p; p = p->next) {
1759 pst = locate_simplify_state(revs, p->item);
1760 p->item = pst->simplified;
1761 }
1762 cnt = remove_duplicate_parents(commit);
1763
1764 /*
1765 * It is possible that we are a merge and one side branch
1766 * does not have any commit that touches the given paths;
1767 * in such a case, the immediate parents will be rewritten
1768 * to different commits.
1769 *
1770 * o----X X: the commit we are looking at;
1771 * / / o: a commit that touches the paths;
1772 * ---o----'
1773 *
1774 * Further reduce the parents by removing redundant parents.
1775 */
1776 if (1 < cnt) {
1777 struct commit_list *h = reduce_heads(commit->parents);
1778 cnt = commit_list_count(h);
1779 free_commit_list(commit->parents);
1780 commit->parents = h;
1781 }
1782
1783 /*
1784 * A commit simplifies to itself if it is a root, if it is
1785 * UNINTERESTING, if it touches the given paths, or if it is a
1786 * merge and its parents simplifies to more than one commits
1787 * (the first two cases are already handled at the beginning of
1788 * this function).
1789 *
1790 * Otherwise, it simplifies to what its sole parent simplifies to.
1791 */
1792 if (!cnt ||
1793 (commit->object.flags & UNINTERESTING) ||
1794 !(commit->object.flags & TREESAME) ||
1795 (1 < cnt))
1796 st->simplified = commit;
1797 else {
1798 pst = locate_simplify_state(revs, commit->parents->item);
1799 st->simplified = pst->simplified;
1800 }
1801 return tail;
1802 }
1803
1804 static void simplify_merges(struct rev_info *revs)
1805 {
1806 struct commit_list *list;
1807 struct commit_list *yet_to_do, **tail;
1808
1809 if (!revs->topo_order)
1810 sort_in_topological_order(&revs->commits, revs->lifo);
1811 if (!revs->prune)
1812 return;
1813
1814 /* feed the list reversed */
1815 yet_to_do = NULL;
1816 for (list = revs->commits; list; list = list->next)
1817 commit_list_insert(list->item, &yet_to_do);
1818 while (yet_to_do) {
1819 list = yet_to_do;
1820 yet_to_do = NULL;
1821 tail = &yet_to_do;
1822 while (list) {
1823 struct commit *commit = list->item;
1824 struct commit_list *next = list->next;
1825 free(list);
1826 list = next;
1827 tail = simplify_one(revs, commit, tail);
1828 }
1829 }
1830
1831 /* clean up the result, removing the simplified ones */
1832 list = revs->commits;
1833 revs->commits = NULL;
1834 tail = &revs->commits;
1835 while (list) {
1836 struct commit *commit = list->item;
1837 struct commit_list *next = list->next;
1838 struct merge_simplify_state *st;
1839 free(list);
1840 list = next;
1841 st = locate_simplify_state(revs, commit);
1842 if (st->simplified == commit)
1843 tail = &commit_list_insert(commit, tail)->next;
1844 }
1845 }
1846
1847 static void set_children(struct rev_info *revs)
1848 {
1849 struct commit_list *l;
1850 for (l = revs->commits; l; l = l->next) {
1851 struct commit *commit = l->item;
1852 struct commit_list *p;
1853
1854 for (p = commit->parents; p; p = p->next)
1855 add_child(revs, p->item, commit);
1856 }
1857 }
1858
1859 int prepare_revision_walk(struct rev_info *revs)
1860 {
1861 int nr = revs->pending.nr;
1862 struct object_array_entry *e, *list;
1863
1864 e = list = revs->pending.objects;
1865 revs->pending.nr = 0;
1866 revs->pending.alloc = 0;
1867 revs->pending.objects = NULL;
1868 while (--nr >= 0) {
1869 struct commit *commit = handle_commit(revs, e->item, e->name);
1870 if (commit) {
1871 if (!(commit->object.flags & SEEN)) {
1872 commit->object.flags |= SEEN;
1873 insert_by_date(commit, &revs->commits);
1874 }
1875 }
1876 e++;
1877 }
1878 free(list);
1879
1880 if (revs->no_walk)
1881 return 0;
1882 if (revs->limited)
1883 if (limit_list(revs) < 0)
1884 return -1;
1885 if (revs->topo_order)
1886 sort_in_topological_order(&revs->commits, revs->lifo);
1887 if (revs->simplify_merges)
1888 simplify_merges(revs);
1889 if (revs->children.name)
1890 set_children(revs);
1891 return 0;
1892 }
1893
1894 enum rewrite_result {
1895 rewrite_one_ok,
1896 rewrite_one_noparents,
1897 rewrite_one_error
1898 };
1899
1900 static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
1901 {
1902 struct commit_list *cache = NULL;
1903
1904 for (;;) {
1905 struct commit *p = *pp;
1906 if (!revs->limited)
1907 if (add_parents_to_list(revs, p, &revs->commits, &cache) < 0)
1908 return rewrite_one_error;
1909 if (p->parents && p->parents->next)
1910 return rewrite_one_ok;
1911 if (p->object.flags & UNINTERESTING)
1912 return rewrite_one_ok;
1913 if (!(p->object.flags & TREESAME))
1914 return rewrite_one_ok;
1915 if (!p->parents)
1916 return rewrite_one_noparents;
1917 *pp = p->parents->item;
1918 }
1919 }
1920
1921 static int rewrite_parents(struct rev_info *revs, struct commit *commit)
1922 {
1923 struct commit_list **pp = &commit->parents;
1924 while (*pp) {
1925 struct commit_list *parent = *pp;
1926 switch (rewrite_one(revs, &parent->item)) {
1927 case rewrite_one_ok:
1928 break;
1929 case rewrite_one_noparents:
1930 *pp = parent->next;
1931 continue;
1932 case rewrite_one_error:
1933 return -1;
1934 }
1935 pp = &parent->next;
1936 }
1937 remove_duplicate_parents(commit);
1938 return 0;
1939 }
1940
1941 static int commit_match(struct commit *commit, struct rev_info *opt)
1942 {
1943 if (!opt->grep_filter.pattern_list && !opt->grep_filter.header_list)
1944 return 1;
1945 return grep_buffer(&opt->grep_filter,
1946 NULL, /* we say nothing, not even filename */
1947 commit->buffer, strlen(commit->buffer));
1948 }
1949
1950 static inline int want_ancestry(struct rev_info *revs)
1951 {
1952 return (revs->rewrite_parents || revs->children.name);
1953 }
1954
1955 enum commit_action get_commit_action(struct rev_info *revs, struct commit *commit)
1956 {
1957 if (commit->object.flags & SHOWN)
1958 return commit_ignore;
1959 if (revs->unpacked && has_sha1_pack(commit->object.sha1))
1960 return commit_ignore;
1961 if (revs->show_all)
1962 return commit_show;
1963 if (commit->object.flags & UNINTERESTING)
1964 return commit_ignore;
1965 if (revs->min_age != -1 && (commit->date > revs->min_age))
1966 return commit_ignore;
1967 if (revs->no_merges && commit->parents && commit->parents->next)
1968 return commit_ignore;
1969 if (revs->merges_only && !(commit->parents && commit->parents->next))
1970 return commit_ignore;
1971 if (!commit_match(commit, revs))
1972 return commit_ignore;
1973 if (revs->prune && revs->dense) {
1974 /* Commit without changes? */
1975 if (commit->object.flags & TREESAME) {
1976 /* drop merges unless we want parenthood */
1977 if (!want_ancestry(revs))
1978 return commit_ignore;
1979 /* non-merge - always ignore it */
1980 if (!commit->parents || !commit->parents->next)
1981 return commit_ignore;
1982 }
1983 }
1984 return commit_show;
1985 }
1986
1987 enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
1988 {
1989 enum commit_action action = get_commit_action(revs, commit);
1990
1991 if (action == commit_show &&
1992 !revs->show_all &&
1993 revs->prune && revs->dense && want_ancestry(revs)) {
1994 if (rewrite_parents(revs, commit) < 0)
1995 return commit_error;
1996 }
1997 return action;
1998 }
1999
2000 static struct commit *get_revision_1(struct rev_info *revs)
2001 {
2002 if (!revs->commits)
2003 return NULL;
2004
2005 do {
2006 struct commit_list *entry = revs->commits;
2007 struct commit *commit = entry->item;
2008
2009 revs->commits = entry->next;
2010 free(entry);
2011
2012 if (revs->reflog_info)
2013 fake_reflog_parent(revs->reflog_info, commit);
2014
2015 /*
2016 * If we haven't done the list limiting, we need to look at
2017 * the parents here. We also need to do the date-based limiting
2018 * that we'd otherwise have done in limit_list().
2019 */
2020 if (!revs->limited) {
2021 if (revs->max_age != -1 &&
2022 (commit->date < revs->max_age))
2023 continue;
2024 if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0)
2025 die("Failed to traverse parents of commit %s",
2026 sha1_to_hex(commit->object.sha1));
2027 }
2028
2029 switch (simplify_commit(revs, commit)) {
2030 case commit_ignore:
2031 continue;
2032 case commit_error:
2033 die("Failed to simplify parents of commit %s",
2034 sha1_to_hex(commit->object.sha1));
2035 default:
2036 return commit;
2037 }
2038 } while (revs->commits);
2039 return NULL;
2040 }
2041
2042 static void gc_boundary(struct object_array *array)
2043 {
2044 unsigned nr = array->nr;
2045 unsigned alloc = array->alloc;
2046 struct object_array_entry *objects = array->objects;
2047
2048 if (alloc <= nr) {
2049 unsigned i, j;
2050 for (i = j = 0; i < nr; i++) {
2051 if (objects[i].item->flags & SHOWN)
2052 continue;
2053 if (i != j)
2054 objects[j] = objects[i];
2055 j++;
2056 }
2057 for (i = j; i < nr; i++)
2058 objects[i].item = NULL;
2059 array->nr = j;
2060 }
2061 }
2062
2063 static void create_boundary_commit_list(struct rev_info *revs)
2064 {
2065 unsigned i;
2066 struct commit *c;
2067 struct object_array *array = &revs->boundary_commits;
2068 struct object_array_entry *objects = array->objects;
2069
2070 /*
2071 * If revs->commits is non-NULL at this point, an error occurred in
2072 * get_revision_1(). Ignore the error and continue printing the
2073 * boundary commits anyway. (This is what the code has always
2074 * done.)
2075 */
2076 if (revs->commits) {
2077 free_commit_list(revs->commits);
2078 revs->commits = NULL;
2079 }
2080
2081 /*
2082 * Put all of the actual boundary commits from revs->boundary_commits
2083 * into revs->commits
2084 */
2085 for (i = 0; i < array->nr; i++) {
2086 c = (struct commit *)(objects[i].item);
2087 if (!c)
2088 continue;
2089 if (!(c->object.flags & CHILD_SHOWN))
2090 continue;
2091 if (c->object.flags & (SHOWN | BOUNDARY))
2092 continue;
2093 c->object.flags |= BOUNDARY;
2094 commit_list_insert(c, &revs->commits);
2095 }
2096
2097 /*
2098 * If revs->topo_order is set, sort the boundary commits
2099 * in topological order
2100 */
2101 sort_in_topological_order(&revs->commits, revs->lifo);
2102 }
2103
2104 static struct commit *get_revision_internal(struct rev_info *revs)
2105 {
2106 struct commit *c = NULL;
2107 struct commit_list *l;
2108
2109 if (revs->boundary == 2) {
2110 /*
2111 * All of the normal commits have already been returned,
2112 * and we are now returning boundary commits.
2113 * create_boundary_commit_list() has populated
2114 * revs->commits with the remaining commits to return.
2115 */
2116 c = pop_commit(&revs->commits);
2117 if (c)
2118 c->object.flags |= SHOWN;
2119 return c;
2120 }
2121
2122 /*
2123 * Now pick up what they want to give us
2124 */
2125 c = get_revision_1(revs);
2126 if (c) {
2127 while (0 < revs->skip_count) {
2128 revs->skip_count--;
2129 c = get_revision_1(revs);
2130 if (!c)
2131 break;
2132 }
2133 }
2134
2135 /*
2136 * Check the max_count.
2137 */
2138 switch (revs->max_count) {
2139 case -1:
2140 break;
2141 case 0:
2142 c = NULL;
2143 break;
2144 default:
2145 revs->max_count--;
2146 }
2147
2148 if (c)
2149 c->object.flags |= SHOWN;
2150
2151 if (!revs->boundary) {
2152 return c;
2153 }
2154
2155 if (!c) {
2156 /*
2157 * get_revision_1() runs out the commits, and
2158 * we are done computing the boundaries.
2159 * switch to boundary commits output mode.
2160 */
2161 revs->boundary = 2;
2162
2163 /*
2164 * Update revs->commits to contain the list of
2165 * boundary commits.
2166 */
2167 create_boundary_commit_list(revs);
2168
2169 return get_revision_internal(revs);
2170 }
2171
2172 /*
2173 * boundary commits are the commits that are parents of the
2174 * ones we got from get_revision_1() but they themselves are
2175 * not returned from get_revision_1(). Before returning
2176 * 'c', we need to mark its parents that they could be boundaries.
2177 */
2178
2179 for (l = c->parents; l; l = l->next) {
2180 struct object *p;
2181 p = &(l->item->object);
2182 if (p->flags & (CHILD_SHOWN | SHOWN))
2183 continue;
2184 p->flags |= CHILD_SHOWN;
2185 gc_boundary(&revs->boundary_commits);
2186 add_object_array(p, NULL, &revs->boundary_commits);
2187 }
2188
2189 return c;
2190 }
2191
2192 struct commit *get_revision(struct rev_info *revs)
2193 {
2194 struct commit *c;
2195 struct commit_list *reversed;
2196
2197 if (revs->reverse) {
2198 reversed = NULL;
2199 while ((c = get_revision_internal(revs))) {
2200 commit_list_insert(c, &reversed);
2201 }
2202 revs->commits = reversed;
2203 revs->reverse = 0;
2204 revs->reverse_output_stage = 1;
2205 }
2206
2207 if (revs->reverse_output_stage)
2208 return pop_commit(&revs->commits);
2209
2210 c = get_revision_internal(revs);
2211 if (c && revs->graph)
2212 graph_update(revs->graph, c);
2213 return c;
2214 }