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GIT 1.5.5.5
[tgit.git] / revision.c
blobffbed3fbf22c22b8862c49bdddd10cab201f86a2
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 "grep.h"
10 #include "reflog-walk.h"
11 #include "patch-ids.h"
12
13 volatile show_early_output_fn_t show_early_output;
14
15 static char *path_name(struct name_path *path, const char *name)
16 {
17 struct name_path *p;
18 char *n, *m;
19 int nlen = strlen(name);
20 int len = nlen + 1;
21
22 for (p = path; p; p = p->up) {
23 if (p->elem_len)
24 len += p->elem_len + 1;
25 }
26 n = xmalloc(len);
27 m = n + len - (nlen + 1);
28 strcpy(m, name);
29 for (p = path; p; p = p->up) {
30 if (p->elem_len) {
31 m -= p->elem_len + 1;
32 memcpy(m, p->elem, p->elem_len);
33 m[p->elem_len] = '/';
34 }
35 }
36 return n;
37 }
38
39 void add_object(struct object *obj,
40 struct object_array *p,
41 struct name_path *path,
42 const char *name)
43 {
44 add_object_array(obj, path_name(path, name), p);
45 }
46
47 static void mark_blob_uninteresting(struct blob *blob)
48 {
49 if (!blob)
50 return;
51 if (blob->object.flags & UNINTERESTING)
52 return;
53 blob->object.flags |= UNINTERESTING;
54 }
55
56 void mark_tree_uninteresting(struct tree *tree)
57 {
58 struct tree_desc desc;
59 struct name_entry entry;
60 struct object *obj = &tree->object;
61
62 if (!tree)
63 return;
64 if (obj->flags & UNINTERESTING)
65 return;
66 obj->flags |= UNINTERESTING;
67 if (!has_sha1_file(obj->sha1))
68 return;
69 if (parse_tree(tree) < 0)
70 die("bad tree %s", sha1_to_hex(obj->sha1));
71
72 init_tree_desc(&desc, tree->buffer, tree->size);
73 while (tree_entry(&desc, &entry)) {
74 switch (object_type(entry.mode)) {
75 case OBJ_TREE:
76 mark_tree_uninteresting(lookup_tree(entry.sha1));
77 break;
78 case OBJ_BLOB:
79 mark_blob_uninteresting(lookup_blob(entry.sha1));
80 break;
81 default:
82 /* Subproject commit - not in this repository */
83 break;
84 }
85 }
86
87 /*
88 * We don't care about the tree any more
89 * after it has been marked uninteresting.
90 */
91 free(tree->buffer);
92 tree->buffer = NULL;
93 }
94
95 void mark_parents_uninteresting(struct commit *commit)
96 {
97 struct commit_list *parents = commit->parents;
98
99 while (parents) {
100 struct commit *commit = parents->item;
101 if (!(commit->object.flags & UNINTERESTING)) {
102 commit->object.flags |= UNINTERESTING;
103
104 /*
105 * Normally we haven't parsed the parent
106 * yet, so we won't have a parent of a parent
107 * here. However, it may turn out that we've
108 * reached this commit some other way (where it
109 * wasn't uninteresting), in which case we need
110 * to mark its parents recursively too..
111 */
112 if (commit->parents)
113 mark_parents_uninteresting(commit);
114 }
115
116 /*
117 * A missing commit is ok iff its parent is marked
118 * uninteresting.
119 *
120 * We just mark such a thing parsed, so that when
121 * it is popped next time around, we won't be trying
122 * to parse it and get an error.
123 */
124 if (!has_sha1_file(commit->object.sha1))
125 commit->object.parsed = 1;
126 parents = parents->next;
127 }
128 }
129
130 static void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode)
131 {
132 if (revs->no_walk && (obj->flags & UNINTERESTING))
133 die("object ranges do not make sense when not walking revisions");
134 if (revs->reflog_info && obj->type == OBJ_COMMIT &&
135 add_reflog_for_walk(revs->reflog_info,
136 (struct commit *)obj, name))
137 return;
138 add_object_array_with_mode(obj, name, &revs->pending, mode);
139 }
140
141 void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
142 {
143 add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
144 }
145
146 void add_head_to_pending(struct rev_info *revs)
147 {
148 unsigned char sha1[20];
149 struct object *obj;
150 if (get_sha1("HEAD", sha1))
151 return;
152 obj = parse_object(sha1);
153 if (!obj)
154 return;
155 add_pending_object(revs, obj, "HEAD");
156 }
157
158 static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
159 {
160 struct object *object;
161
162 object = parse_object(sha1);
163 if (!object)
164 die("bad object %s", name);
165 object->flags |= flags;
166 return object;
167 }
168
169 static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
170 {
171 unsigned long flags = object->flags;
172
173 /*
174 * Tag object? Look what it points to..
175 */
176 while (object->type == OBJ_TAG) {
177 struct tag *tag = (struct tag *) object;
178 if (revs->tag_objects && !(flags & UNINTERESTING))
179 add_pending_object(revs, object, tag->tag);
180 if (!tag->tagged)
181 die("bad tag");
182 object = parse_object(tag->tagged->sha1);
183 if (!object)
184 die("bad object %s", sha1_to_hex(tag->tagged->sha1));
185 }
186
187 /*
188 * Commit object? Just return it, we'll do all the complex
189 * reachability crud.
190 */
191 if (object->type == OBJ_COMMIT) {
192 struct commit *commit = (struct commit *)object;
193 if (parse_commit(commit) < 0)
194 die("unable to parse commit %s", name);
195 if (flags & UNINTERESTING) {
196 commit->object.flags |= UNINTERESTING;
197 mark_parents_uninteresting(commit);
198 revs->limited = 1;
199 }
200 return commit;
201 }
202
203 /*
204 * Tree object? Either mark it uniniteresting, or add it
205 * to the list of objects to look at later..
206 */
207 if (object->type == OBJ_TREE) {
208 struct tree *tree = (struct tree *)object;
209 if (!revs->tree_objects)
210 return NULL;
211 if (flags & UNINTERESTING) {
212 mark_tree_uninteresting(tree);
213 return NULL;
214 }
215 add_pending_object(revs, object, "");
216 return NULL;
217 }
218
219 /*
220 * Blob object? You know the drill by now..
221 */
222 if (object->type == OBJ_BLOB) {
223 struct blob *blob = (struct blob *)object;
224 if (!revs->blob_objects)
225 return NULL;
226 if (flags & UNINTERESTING) {
227 mark_blob_uninteresting(blob);
228 return NULL;
229 }
230 add_pending_object(revs, object, "");
231 return NULL;
232 }
233 die("%s is unknown object", name);
234 }
235
236 static int everybody_uninteresting(struct commit_list *orig)
237 {
238 struct commit_list *list = orig;
239 while (list) {
240 struct commit *commit = list->item;
241 list = list->next;
242 if (commit->object.flags & UNINTERESTING)
243 continue;
244 return 0;
245 }
246 return 1;
247 }
248
249 /*
250 * The goal is to get REV_TREE_NEW as the result only if the
251 * diff consists of all '+' (and no other changes), and
252 * REV_TREE_DIFFERENT otherwise (of course if the trees are
253 * the same we want REV_TREE_SAME). That means that once we
254 * get to REV_TREE_DIFFERENT, we do not have to look any further.
255 */
256 static int tree_difference = REV_TREE_SAME;
257
258 static void file_add_remove(struct diff_options *options,
259 int addremove, unsigned mode,
260 const unsigned char *sha1,
261 const char *base, const char *path)
262 {
263 int diff = REV_TREE_DIFFERENT;
264
265 /*
266 * Is it an add of a new file? It means that the old tree
267 * didn't have it at all, so we will turn "REV_TREE_SAME" ->
268 * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
269 * (and if it already was "REV_TREE_NEW", we'll keep it
270 * "REV_TREE_NEW" of course).
271 */
272 if (addremove == '+') {
273 diff = tree_difference;
274 if (diff != REV_TREE_SAME)
275 return;
276 diff = REV_TREE_NEW;
277 }
278 tree_difference = diff;
279 if (tree_difference == REV_TREE_DIFFERENT)
280 DIFF_OPT_SET(options, HAS_CHANGES);
281 }
282
283 static void file_change(struct diff_options *options,
284 unsigned old_mode, unsigned new_mode,
285 const unsigned char *old_sha1,
286 const unsigned char *new_sha1,
287 const char *base, const char *path)
288 {
289 tree_difference = REV_TREE_DIFFERENT;
290 DIFF_OPT_SET(options, HAS_CHANGES);
291 }
292
293 static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
294 {
295 if (!t1)
296 return REV_TREE_NEW;
297 if (!t2)
298 return REV_TREE_DIFFERENT;
299 tree_difference = REV_TREE_SAME;
300 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
301 if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
302 &revs->pruning) < 0)
303 return REV_TREE_DIFFERENT;
304 return tree_difference;
305 }
306
307 static int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
308 {
309 int retval;
310 void *tree;
311 unsigned long size;
312 struct tree_desc empty, real;
313
314 if (!t1)
315 return 0;
316
317 tree = read_object_with_reference(t1->object.sha1, tree_type, &size, NULL);
318 if (!tree)
319 return 0;
320 init_tree_desc(&real, tree, size);
321 init_tree_desc(&empty, "", 0);
322
323 tree_difference = REV_TREE_SAME;
324 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
325 retval = diff_tree(&empty, &real, "", &revs->pruning);
326 free(tree);
327
328 return retval >= 0 && (tree_difference == REV_TREE_SAME);
329 }
330
331 static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
332 {
333 struct commit_list **pp, *parent;
334 int tree_changed = 0, tree_same = 0;
335
336 /*
337 * If we don't do pruning, everything is interesting
338 */
339 if (!revs->prune)
340 return;
341
342 if (!commit->tree)
343 return;
344
345 if (!commit->parents) {
346 if (rev_same_tree_as_empty(revs, commit->tree))
347 commit->object.flags |= TREESAME;
348 return;
349 }
350
351 /*
352 * Normal non-merge commit? If we don't want to make the
353 * history dense, we consider it always to be a change..
354 */
355 if (!revs->dense && !commit->parents->next)
356 return;
357
358 pp = &commit->parents;
359 while ((parent = *pp) != NULL) {
360 struct commit *p = parent->item;
361
362 if (parse_commit(p) < 0)
363 die("cannot simplify commit %s (because of %s)",
364 sha1_to_hex(commit->object.sha1),
365 sha1_to_hex(p->object.sha1));
366 switch (rev_compare_tree(revs, p->tree, commit->tree)) {
367 case REV_TREE_SAME:
368 tree_same = 1;
369 if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
370 /* Even if a merge with an uninteresting
371 * side branch brought the entire change
372 * we are interested in, we do not want
373 * to lose the other branches of this
374 * merge, so we just keep going.
375 */
376 pp = &parent->next;
377 continue;
378 }
379 parent->next = NULL;
380 commit->parents = parent;
381 commit->object.flags |= TREESAME;
382 return;
383
384 case REV_TREE_NEW:
385 if (revs->remove_empty_trees &&
386 rev_same_tree_as_empty(revs, p->tree)) {
387 /* We are adding all the specified
388 * paths from this parent, so the
389 * history beyond this parent is not
390 * interesting. Remove its parents
391 * (they are grandparents for us).
392 * IOW, we pretend this parent is a
393 * "root" commit.
394 */
395 if (parse_commit(p) < 0)
396 die("cannot simplify commit %s (invalid %s)",
397 sha1_to_hex(commit->object.sha1),
398 sha1_to_hex(p->object.sha1));
399 p->parents = NULL;
400 }
401 /* fallthrough */
402 case REV_TREE_DIFFERENT:
403 tree_changed = 1;
404 pp = &parent->next;
405 continue;
406 }
407 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
408 }
409 if (tree_changed && !tree_same)
410 return;
411 commit->object.flags |= TREESAME;
412 }
413
414 static int add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
415 {
416 struct commit_list *parent = commit->parents;
417 unsigned left_flag;
418 int add, rest;
419
420 if (commit->object.flags & ADDED)
421 return 0;
422 commit->object.flags |= ADDED;
423
424 /*
425 * If the commit is uninteresting, don't try to
426 * prune parents - we want the maximal uninteresting
427 * set.
428 *
429 * Normally we haven't parsed the parent
430 * yet, so we won't have a parent of a parent
431 * here. However, it may turn out that we've
432 * reached this commit some other way (where it
433 * wasn't uninteresting), in which case we need
434 * to mark its parents recursively too..
435 */
436 if (commit->object.flags & UNINTERESTING) {
437 while (parent) {
438 struct commit *p = parent->item;
439 parent = parent->next;
440 if (parse_commit(p) < 0)
441 return -1;
442 p->object.flags |= UNINTERESTING;
443 if (p->parents)
444 mark_parents_uninteresting(p);
445 if (p->object.flags & SEEN)
446 continue;
447 p->object.flags |= SEEN;
448 insert_by_date(p, list);
449 }
450 return 0;
451 }
452
453 /*
454 * Ok, the commit wasn't uninteresting. Try to
455 * simplify the commit history and find the parent
456 * that has no differences in the path set if one exists.
457 */
458 try_to_simplify_commit(revs, commit);
459
460 if (revs->no_walk)
461 return 0;
462
463 left_flag = (commit->object.flags & SYMMETRIC_LEFT);
464
465 rest = !revs->first_parent_only;
466 for (parent = commit->parents, add = 1; parent; add = rest) {
467 struct commit *p = parent->item;
468
469 parent = parent->next;
470 if (parse_commit(p) < 0)
471 return -1;
472 p->object.flags |= left_flag;
473 if (p->object.flags & SEEN)
474 continue;
475 p->object.flags |= SEEN;
476 if (add)
477 insert_by_date(p, list);
478 }
479 return 0;
480 }
481
482 static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
483 {
484 struct commit_list *p;
485 int left_count = 0, right_count = 0;
486 int left_first;
487 struct patch_ids ids;
488
489 /* First count the commits on the left and on the right */
490 for (p = list; p; p = p->next) {
491 struct commit *commit = p->item;
492 unsigned flags = commit->object.flags;
493 if (flags & BOUNDARY)
494 ;
495 else if (flags & SYMMETRIC_LEFT)
496 left_count++;
497 else
498 right_count++;
499 }
500
501 left_first = left_count < right_count;
502 init_patch_ids(&ids);
503 if (revs->diffopt.nr_paths) {
504 ids.diffopts.nr_paths = revs->diffopt.nr_paths;
505 ids.diffopts.paths = revs->diffopt.paths;
506 ids.diffopts.pathlens = revs->diffopt.pathlens;
507 }
508
509 /* Compute patch-ids for one side */
510 for (p = list; p; p = p->next) {
511 struct commit *commit = p->item;
512 unsigned flags = commit->object.flags;
513
514 if (flags & BOUNDARY)
515 continue;
516 /*
517 * If we have fewer left, left_first is set and we omit
518 * commits on the right branch in this loop. If we have
519 * fewer right, we skip the left ones.
520 */
521 if (left_first != !!(flags & SYMMETRIC_LEFT))
522 continue;
523 commit->util = add_commit_patch_id(commit, &ids);
524 }
525
526 /* Check the other side */
527 for (p = list; p; p = p->next) {
528 struct commit *commit = p->item;
529 struct patch_id *id;
530 unsigned flags = commit->object.flags;
531
532 if (flags & BOUNDARY)
533 continue;
534 /*
535 * If we have fewer left, left_first is set and we omit
536 * commits on the left branch in this loop.
537 */
538 if (left_first == !!(flags & SYMMETRIC_LEFT))
539 continue;
540
541 /*
542 * Have we seen the same patch id?
543 */
544 id = has_commit_patch_id(commit, &ids);
545 if (!id)
546 continue;
547 id->seen = 1;
548 commit->object.flags |= SHOWN;
549 }
550
551 /* Now check the original side for seen ones */
552 for (p = list; p; p = p->next) {
553 struct commit *commit = p->item;
554 struct patch_id *ent;
555
556 ent = commit->util;
557 if (!ent)
558 continue;
559 if (ent->seen)
560 commit->object.flags |= SHOWN;
561 commit->util = NULL;
562 }
563
564 free_patch_ids(&ids);
565 }
566
567 /* How many extra uninteresting commits we want to see.. */
568 #define SLOP 5
569
570 static int still_interesting(struct commit_list *src, unsigned long date, int slop)
571 {
572 /*
573 * No source list at all? We're definitely done..
574 */
575 if (!src)
576 return 0;
577
578 /*
579 * Does the destination list contain entries with a date
580 * before the source list? Definitely _not_ done.
581 */
582 if (date < src->item->date)
583 return SLOP;
584
585 /*
586 * Does the source list still have interesting commits in
587 * it? Definitely not done..
588 */
589 if (!everybody_uninteresting(src))
590 return SLOP;
591
592 /* Ok, we're closing in.. */
593 return slop-1;
594 }
595
596 static int limit_list(struct rev_info *revs)
597 {
598 int slop = SLOP;
599 unsigned long date = ~0ul;
600 struct commit_list *list = revs->commits;
601 struct commit_list *newlist = NULL;
602 struct commit_list **p = &newlist;
603
604 while (list) {
605 struct commit_list *entry = list;
606 struct commit *commit = list->item;
607 struct object *obj = &commit->object;
608 show_early_output_fn_t show;
609
610 list = list->next;
611 free(entry);
612
613 if (revs->max_age != -1 && (commit->date < revs->max_age))
614 obj->flags |= UNINTERESTING;
615 if (add_parents_to_list(revs, commit, &list) < 0)
616 return -1;
617 if (obj->flags & UNINTERESTING) {
618 mark_parents_uninteresting(commit);
619 if (revs->show_all)
620 p = &commit_list_insert(commit, p)->next;
621 slop = still_interesting(list, date, slop);
622 if (slop)
623 continue;
624 /* If showing all, add the whole pending list to the end */
625 if (revs->show_all)
626 *p = list;
627 break;
628 }
629 if (revs->min_age != -1 && (commit->date > revs->min_age))
630 continue;
631 date = commit->date;
632 p = &commit_list_insert(commit, p)->next;
633
634 show = show_early_output;
635 if (!show)
636 continue;
637
638 show(revs, newlist);
639 show_early_output = NULL;
640 }
641 if (revs->cherry_pick)
642 cherry_pick_list(newlist, revs);
643
644 revs->commits = newlist;
645 return 0;
646 }
647
648 struct all_refs_cb {
649 int all_flags;
650 int warned_bad_reflog;
651 struct rev_info *all_revs;
652 const char *name_for_errormsg;
653 };
654
655 static int handle_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
656 {
657 struct all_refs_cb *cb = cb_data;
658 struct object *object = get_reference(cb->all_revs, path, sha1,
659 cb->all_flags);
660 add_pending_object(cb->all_revs, object, path);
661 return 0;
662 }
663
664 static void handle_refs(struct rev_info *revs, unsigned flags,
665 int (*for_each)(each_ref_fn, void *))
666 {
667 struct all_refs_cb cb;
668 cb.all_revs = revs;
669 cb.all_flags = flags;
670 for_each(handle_one_ref, &cb);
671 }
672
673 static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
674 {
675 struct all_refs_cb *cb = cb_data;
676 if (!is_null_sha1(sha1)) {
677 struct object *o = parse_object(sha1);
678 if (o) {
679 o->flags |= cb->all_flags;
680 add_pending_object(cb->all_revs, o, "");
681 }
682 else if (!cb->warned_bad_reflog) {
683 warning("reflog of '%s' references pruned commits",
684 cb->name_for_errormsg);
685 cb->warned_bad_reflog = 1;
686 }
687 }
688 }
689
690 static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
691 const char *email, unsigned long timestamp, int tz,
692 const char *message, void *cb_data)
693 {
694 handle_one_reflog_commit(osha1, cb_data);
695 handle_one_reflog_commit(nsha1, cb_data);
696 return 0;
697 }
698
699 static int handle_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
700 {
701 struct all_refs_cb *cb = cb_data;
702 cb->warned_bad_reflog = 0;
703 cb->name_for_errormsg = path;
704 for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
705 return 0;
706 }
707
708 static void handle_reflog(struct rev_info *revs, unsigned flags)
709 {
710 struct all_refs_cb cb;
711 cb.all_revs = revs;
712 cb.all_flags = flags;
713 for_each_reflog(handle_one_reflog, &cb);
714 }
715
716 static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
717 {
718 unsigned char sha1[20];
719 struct object *it;
720 struct commit *commit;
721 struct commit_list *parents;
722
723 if (*arg == '^') {
724 flags ^= UNINTERESTING;
725 arg++;
726 }
727 if (get_sha1(arg, sha1))
728 return 0;
729 while (1) {
730 it = get_reference(revs, arg, sha1, 0);
731 if (it->type != OBJ_TAG)
732 break;
733 if (!((struct tag*)it)->tagged)
734 return 0;
735 hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
736 }
737 if (it->type != OBJ_COMMIT)
738 return 0;
739 commit = (struct commit *)it;
740 for (parents = commit->parents; parents; parents = parents->next) {
741 it = &parents->item->object;
742 it->flags |= flags;
743 add_pending_object(revs, it, arg);
744 }
745 return 1;
746 }
747
748 void init_revisions(struct rev_info *revs, const char *prefix)
749 {
750 memset(revs, 0, sizeof(*revs));
751
752 revs->abbrev = DEFAULT_ABBREV;
753 revs->ignore_merges = 1;
754 revs->simplify_history = 1;
755 DIFF_OPT_SET(&revs->pruning, RECURSIVE);
756 DIFF_OPT_SET(&revs->pruning, QUIET);
757 revs->pruning.add_remove = file_add_remove;
758 revs->pruning.change = file_change;
759 revs->lifo = 1;
760 revs->dense = 1;
761 revs->prefix = prefix;
762 revs->max_age = -1;
763 revs->min_age = -1;
764 revs->skip_count = -1;
765 revs->max_count = -1;
766
767 revs->commit_format = CMIT_FMT_DEFAULT;
768
769 diff_setup(&revs->diffopt);
770 if (prefix && !revs->diffopt.prefix) {
771 revs->diffopt.prefix = prefix;
772 revs->diffopt.prefix_length = strlen(prefix);
773 }
774 }
775
776 static void add_pending_commit_list(struct rev_info *revs,
777 struct commit_list *commit_list,
778 unsigned int flags)
779 {
780 while (commit_list) {
781 struct object *object = &commit_list->item->object;
782 object->flags |= flags;
783 add_pending_object(revs, object, sha1_to_hex(object->sha1));
784 commit_list = commit_list->next;
785 }
786 }
787
788 static void prepare_show_merge(struct rev_info *revs)
789 {
790 struct commit_list *bases;
791 struct commit *head, *other;
792 unsigned char sha1[20];
793 const char **prune = NULL;
794 int i, prune_num = 1; /* counting terminating NULL */
795
796 if (get_sha1("HEAD", sha1) || !(head = lookup_commit(sha1)))
797 die("--merge without HEAD?");
798 if (get_sha1("MERGE_HEAD", sha1) || !(other = lookup_commit(sha1)))
799 die("--merge without MERGE_HEAD?");
800 add_pending_object(revs, &head->object, "HEAD");
801 add_pending_object(revs, &other->object, "MERGE_HEAD");
802 bases = get_merge_bases(head, other, 1);
803 add_pending_commit_list(revs, bases, UNINTERESTING);
804 free_commit_list(bases);
805 head->object.flags |= SYMMETRIC_LEFT;
806
807 if (!active_nr)
808 read_cache();
809 for (i = 0; i < active_nr; i++) {
810 struct cache_entry *ce = active_cache[i];
811 if (!ce_stage(ce))
812 continue;
813 if (ce_path_match(ce, revs->prune_data)) {
814 prune_num++;
815 prune = xrealloc(prune, sizeof(*prune) * prune_num);
816 prune[prune_num-2] = ce->name;
817 prune[prune_num-1] = NULL;
818 }
819 while ((i+1 < active_nr) &&
820 ce_same_name(ce, active_cache[i+1]))
821 i++;
822 }
823 revs->prune_data = prune;
824 revs->limited = 1;
825 }
826
827 int handle_revision_arg(const char *arg, struct rev_info *revs,
828 int flags,
829 int cant_be_filename)
830 {
831 unsigned mode;
832 char *dotdot;
833 struct object *object;
834 unsigned char sha1[20];
835 int local_flags;
836
837 dotdot = strstr(arg, "..");
838 if (dotdot) {
839 unsigned char from_sha1[20];
840 const char *next = dotdot + 2;
841 const char *this = arg;
842 int symmetric = *next == '.';
843 unsigned int flags_exclude = flags ^ UNINTERESTING;
844
845 *dotdot = 0;
846 next += symmetric;
847
848 if (!*next)
849 next = "HEAD";
850 if (dotdot == arg)
851 this = "HEAD";
852 if (!get_sha1(this, from_sha1) &&
853 !get_sha1(next, sha1)) {
854 struct commit *a, *b;
855 struct commit_list *exclude;
856
857 a = lookup_commit_reference(from_sha1);
858 b = lookup_commit_reference(sha1);
859 if (!a || !b) {
860 die(symmetric ?
861 "Invalid symmetric difference expression %s...%s" :
862 "Invalid revision range %s..%s",
863 arg, next);
864 }
865
866 if (!cant_be_filename) {
867 *dotdot = '.';
868 verify_non_filename(revs->prefix, arg);
869 }
870
871 if (symmetric) {
872 exclude = get_merge_bases(a, b, 1);
873 add_pending_commit_list(revs, exclude,
874 flags_exclude);
875 free_commit_list(exclude);
876 a->object.flags |= flags | SYMMETRIC_LEFT;
877 } else
878 a->object.flags |= flags_exclude;
879 b->object.flags |= flags;
880 add_pending_object(revs, &a->object, this);
881 add_pending_object(revs, &b->object, next);
882 return 0;
883 }
884 *dotdot = '.';
885 }
886 dotdot = strstr(arg, "^@");
887 if (dotdot && !dotdot[2]) {
888 *dotdot = 0;
889 if (add_parents_only(revs, arg, flags))
890 return 0;
891 *dotdot = '^';
892 }
893 dotdot = strstr(arg, "^!");
894 if (dotdot && !dotdot[2]) {
895 *dotdot = 0;
896 if (!add_parents_only(revs, arg, flags ^ UNINTERESTING))
897 *dotdot = '^';
898 }
899
900 local_flags = 0;
901 if (*arg == '^') {
902 local_flags = UNINTERESTING;
903 arg++;
904 }
905 if (get_sha1_with_mode(arg, sha1, &mode))
906 return -1;
907 if (!cant_be_filename)
908 verify_non_filename(revs->prefix, arg);
909 object = get_reference(revs, arg, sha1, flags ^ local_flags);
910 add_pending_object_with_mode(revs, object, arg, mode);
911 return 0;
912 }
913
914 static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
915 {
916 if (!revs->grep_filter) {
917 struct grep_opt *opt = xcalloc(1, sizeof(*opt));
918 opt->status_only = 1;
919 opt->pattern_tail = &(opt->pattern_list);
920 opt->regflags = REG_NEWLINE;
921 revs->grep_filter = opt;
922 }
923 append_grep_pattern(revs->grep_filter, ptn,
924 "command line", 0, what);
925 }
926
927 static void add_header_grep(struct rev_info *revs, const char *field, const char *pattern)
928 {
929 char *pat;
930 const char *prefix;
931 int patlen, fldlen;
932
933 fldlen = strlen(field);
934 patlen = strlen(pattern);
935 pat = xmalloc(patlen + fldlen + 10);
936 prefix = ".*";
937 if (*pattern == '^') {
938 prefix = "";
939 pattern++;
940 }
941 sprintf(pat, "^%s %s%s", field, prefix, pattern);
942 add_grep(revs, pat, GREP_PATTERN_HEAD);
943 }
944
945 static void add_message_grep(struct rev_info *revs, const char *pattern)
946 {
947 add_grep(revs, pattern, GREP_PATTERN_BODY);
948 }
949
950 static void add_ignore_packed(struct rev_info *revs, const char *name)
951 {
952 int num = ++revs->num_ignore_packed;
953
954 revs->ignore_packed = xrealloc(revs->ignore_packed,
955 sizeof(const char **) * (num + 1));
956 revs->ignore_packed[num-1] = name;
957 revs->ignore_packed[num] = NULL;
958 }
959
960 /*
961 * Parse revision information, filling in the "rev_info" structure,
962 * and removing the used arguments from the argument list.
963 *
964 * Returns the number of arguments left that weren't recognized
965 * (which are also moved to the head of the argument list)
966 */
967 int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
968 {
969 int i, flags, seen_dashdash, show_merge;
970 const char **unrecognized = argv + 1;
971 int left = 1;
972 int all_match = 0;
973 int regflags = 0;
974 int fixed = 0;
975
976 /* First, search for "--" */
977 seen_dashdash = 0;
978 for (i = 1; i < argc; i++) {
979 const char *arg = argv[i];
980 if (strcmp(arg, "--"))
981 continue;
982 argv[i] = NULL;
983 argc = i;
984 if (argv[i + 1])
985 revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
986 seen_dashdash = 1;
987 break;
988 }
989
990 flags = show_merge = 0;
991 for (i = 1; i < argc; i++) {
992 const char *arg = argv[i];
993 if (*arg == '-') {
994 int opts;
995 if (!prefixcmp(arg, "--max-count=")) {
996 revs->max_count = atoi(arg + 12);
997 continue;
998 }
999 if (!prefixcmp(arg, "--skip=")) {
1000 revs->skip_count = atoi(arg + 7);
1001 continue;
1002 }
1003 /* accept -<digit>, like traditional "head" */
1004 if ((*arg == '-') && isdigit(arg[1])) {
1005 revs->max_count = atoi(arg + 1);
1006 continue;
1007 }
1008 if (!strcmp(arg, "-n")) {
1009 if (argc <= i + 1)
1010 die("-n requires an argument");
1011 revs->max_count = atoi(argv[++i]);
1012 continue;
1013 }
1014 if (!prefixcmp(arg, "-n")) {
1015 revs->max_count = atoi(arg + 2);
1016 continue;
1017 }
1018 if (!prefixcmp(arg, "--max-age=")) {
1019 revs->max_age = atoi(arg + 10);
1020 continue;
1021 }
1022 if (!prefixcmp(arg, "--since=")) {
1023 revs->max_age = approxidate(arg + 8);
1024 continue;
1025 }
1026 if (!prefixcmp(arg, "--after=")) {
1027 revs->max_age = approxidate(arg + 8);
1028 continue;
1029 }
1030 if (!prefixcmp(arg, "--min-age=")) {
1031 revs->min_age = atoi(arg + 10);
1032 continue;
1033 }
1034 if (!prefixcmp(arg, "--before=")) {
1035 revs->min_age = approxidate(arg + 9);
1036 continue;
1037 }
1038 if (!prefixcmp(arg, "--until=")) {
1039 revs->min_age = approxidate(arg + 8);
1040 continue;
1041 }
1042 if (!strcmp(arg, "--all")) {
1043 handle_refs(revs, flags, for_each_ref);
1044 continue;
1045 }
1046 if (!strcmp(arg, "--branches")) {
1047 handle_refs(revs, flags, for_each_branch_ref);
1048 continue;
1049 }
1050 if (!strcmp(arg, "--tags")) {
1051 handle_refs(revs, flags, for_each_tag_ref);
1052 continue;
1053 }
1054 if (!strcmp(arg, "--remotes")) {
1055 handle_refs(revs, flags, for_each_remote_ref);
1056 continue;
1057 }
1058 if (!strcmp(arg, "--first-parent")) {
1059 revs->first_parent_only = 1;
1060 continue;
1061 }
1062 if (!strcmp(arg, "--reflog")) {
1063 handle_reflog(revs, flags);
1064 continue;
1065 }
1066 if (!strcmp(arg, "-g") ||
1067 !strcmp(arg, "--walk-reflogs")) {
1068 init_reflog_walk(&revs->reflog_info);
1069 continue;
1070 }
1071 if (!strcmp(arg, "--not")) {
1072 flags ^= UNINTERESTING;
1073 continue;
1074 }
1075 if (!strcmp(arg, "--default")) {
1076 if (++i >= argc)
1077 die("bad --default argument");
1078 def = argv[i];
1079 continue;
1080 }
1081 if (!strcmp(arg, "--merge")) {
1082 show_merge = 1;
1083 continue;
1084 }
1085 if (!strcmp(arg, "--topo-order")) {
1086 revs->lifo = 1;
1087 revs->topo_order = 1;
1088 continue;
1089 }
1090 if (!strcmp(arg, "--date-order")) {
1091 revs->lifo = 0;
1092 revs->topo_order = 1;
1093 continue;
1094 }
1095 if (!prefixcmp(arg, "--early-output")) {
1096 int count = 100;
1097 switch (arg[14]) {
1098 case '=':
1099 count = atoi(arg+15);
1100 /* Fallthrough */
1101 case 0:
1102 revs->topo_order = 1;
1103 revs->early_output = count;
1104 continue;
1105 }
1106 }
1107 if (!strcmp(arg, "--parents")) {
1108 revs->parents = 1;
1109 continue;
1110 }
1111 if (!strcmp(arg, "--dense")) {
1112 revs->dense = 1;
1113 continue;
1114 }
1115 if (!strcmp(arg, "--sparse")) {
1116 revs->dense = 0;
1117 continue;
1118 }
1119 if (!strcmp(arg, "--show-all")) {
1120 revs->show_all = 1;
1121 continue;
1122 }
1123 if (!strcmp(arg, "--remove-empty")) {
1124 revs->remove_empty_trees = 1;
1125 continue;
1126 }
1127 if (!strcmp(arg, "--no-merges")) {
1128 revs->no_merges = 1;
1129 continue;
1130 }
1131 if (!strcmp(arg, "--boundary")) {
1132 revs->boundary = 1;
1133 continue;
1134 }
1135 if (!strcmp(arg, "--left-right")) {
1136 revs->left_right = 1;
1137 continue;
1138 }
1139 if (!strcmp(arg, "--cherry-pick")) {
1140 revs->cherry_pick = 1;
1141 revs->limited = 1;
1142 continue;
1143 }
1144 if (!strcmp(arg, "--objects")) {
1145 revs->tag_objects = 1;
1146 revs->tree_objects = 1;
1147 revs->blob_objects = 1;
1148 continue;
1149 }
1150 if (!strcmp(arg, "--objects-edge")) {
1151 revs->tag_objects = 1;
1152 revs->tree_objects = 1;
1153 revs->blob_objects = 1;
1154 revs->edge_hint = 1;
1155 continue;
1156 }
1157 if (!strcmp(arg, "--unpacked")) {
1158 revs->unpacked = 1;
1159 free(revs->ignore_packed);
1160 revs->ignore_packed = NULL;
1161 revs->num_ignore_packed = 0;
1162 continue;
1163 }
1164 if (!prefixcmp(arg, "--unpacked=")) {
1165 revs->unpacked = 1;
1166 add_ignore_packed(revs, arg+11);
1167 continue;
1168 }
1169 if (!strcmp(arg, "-r")) {
1170 revs->diff = 1;
1171 DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
1172 continue;
1173 }
1174 if (!strcmp(arg, "-t")) {
1175 revs->diff = 1;
1176 DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
1177 DIFF_OPT_SET(&revs->diffopt, TREE_IN_RECURSIVE);
1178 continue;
1179 }
1180 if (!strcmp(arg, "-m")) {
1181 revs->ignore_merges = 0;
1182 continue;
1183 }
1184 if (!strcmp(arg, "-c")) {
1185 revs->diff = 1;
1186 revs->dense_combined_merges = 0;
1187 revs->combine_merges = 1;
1188 continue;
1189 }
1190 if (!strcmp(arg, "--cc")) {
1191 revs->diff = 1;
1192 revs->dense_combined_merges = 1;
1193 revs->combine_merges = 1;
1194 continue;
1195 }
1196 if (!strcmp(arg, "-v")) {
1197 revs->verbose_header = 1;
1198 continue;
1199 }
1200 if (!prefixcmp(arg, "--pretty")) {
1201 revs->verbose_header = 1;
1202 revs->commit_format = get_commit_format(arg+8);
1203 continue;
1204 }
1205 if (!strcmp(arg, "--root")) {
1206 revs->show_root_diff = 1;
1207 continue;
1208 }
1209 if (!strcmp(arg, "--no-commit-id")) {
1210 revs->no_commit_id = 1;
1211 continue;
1212 }
1213 if (!strcmp(arg, "--always")) {
1214 revs->always_show_header = 1;
1215 continue;
1216 }
1217 if (!strcmp(arg, "--no-abbrev")) {
1218 revs->abbrev = 0;
1219 continue;
1220 }
1221 if (!strcmp(arg, "--abbrev")) {
1222 revs->abbrev = DEFAULT_ABBREV;
1223 continue;
1224 }
1225 if (!prefixcmp(arg, "--abbrev=")) {
1226 revs->abbrev = strtoul(arg + 9, NULL, 10);
1227 if (revs->abbrev < MINIMUM_ABBREV)
1228 revs->abbrev = MINIMUM_ABBREV;
1229 else if (revs->abbrev > 40)
1230 revs->abbrev = 40;
1231 continue;
1232 }
1233 if (!strcmp(arg, "--abbrev-commit")) {
1234 revs->abbrev_commit = 1;
1235 continue;
1236 }
1237 if (!strcmp(arg, "--full-diff")) {
1238 revs->diff = 1;
1239 revs->full_diff = 1;
1240 continue;
1241 }
1242 if (!strcmp(arg, "--full-history")) {
1243 revs->simplify_history = 0;
1244 continue;
1245 }
1246 if (!strcmp(arg, "--relative-date")) {
1247 revs->date_mode = DATE_RELATIVE;
1248 continue;
1249 }
1250 if (!strncmp(arg, "--date=", 7)) {
1251 revs->date_mode = parse_date_format(arg + 7);
1252 continue;
1253 }
1254 if (!strcmp(arg, "--log-size")) {
1255 revs->show_log_size = 1;
1256 continue;
1257 }
1258
1259 /*
1260 * Grepping the commit log
1261 */
1262 if (!prefixcmp(arg, "--author=")) {
1263 add_header_grep(revs, "author", arg+9);
1264 continue;
1265 }
1266 if (!prefixcmp(arg, "--committer=")) {
1267 add_header_grep(revs, "committer", arg+12);
1268 continue;
1269 }
1270 if (!prefixcmp(arg, "--grep=")) {
1271 add_message_grep(revs, arg+7);
1272 continue;
1273 }
1274 if (!strcmp(arg, "--extended-regexp") ||
1275 !strcmp(arg, "-E")) {
1276 regflags |= REG_EXTENDED;
1277 continue;
1278 }
1279 if (!strcmp(arg, "--regexp-ignore-case") ||
1280 !strcmp(arg, "-i")) {
1281 regflags |= REG_ICASE;
1282 continue;
1283 }
1284 if (!strcmp(arg, "--fixed-strings") ||
1285 !strcmp(arg, "-F")) {
1286 fixed = 1;
1287 continue;
1288 }
1289 if (!strcmp(arg, "--all-match")) {
1290 all_match = 1;
1291 continue;
1292 }
1293 if (!prefixcmp(arg, "--encoding=")) {
1294 arg += 11;
1295 if (strcmp(arg, "none"))
1296 git_log_output_encoding = xstrdup(arg);
1297 else
1298 git_log_output_encoding = "";
1299 continue;
1300 }
1301 if (!strcmp(arg, "--reverse")) {
1302 revs->reverse ^= 1;
1303 continue;
1304 }
1305 if (!strcmp(arg, "--no-walk")) {
1306 revs->no_walk = 1;
1307 continue;
1308 }
1309 if (!strcmp(arg, "--do-walk")) {
1310 revs->no_walk = 0;
1311 continue;
1312 }
1313
1314 opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
1315 if (opts > 0) {
1316 i += opts - 1;
1317 continue;
1318 }
1319 *unrecognized++ = arg;
1320 left++;
1321 continue;
1322 }
1323
1324 if (handle_revision_arg(arg, revs, flags, seen_dashdash)) {
1325 int j;
1326 if (seen_dashdash || *arg == '^')
1327 die("bad revision '%s'", arg);
1328
1329 /* If we didn't have a "--":
1330 * (1) all filenames must exist;
1331 * (2) all rev-args must not be interpretable
1332 * as a valid filename.
1333 * but the latter we have checked in the main loop.
1334 */
1335 for (j = i; j < argc; j++)
1336 verify_filename(revs->prefix, argv[j]);
1337
1338 revs->prune_data = get_pathspec(revs->prefix,
1339 argv + i);
1340 break;
1341 }
1342 }
1343
1344 if (revs->grep_filter) {
1345 revs->grep_filter->regflags |= regflags;
1346 revs->grep_filter->fixed = fixed;
1347 }
1348
1349 if (show_merge)
1350 prepare_show_merge(revs);
1351 if (def && !revs->pending.nr) {
1352 unsigned char sha1[20];
1353 struct object *object;
1354 unsigned mode;
1355 if (get_sha1_with_mode(def, sha1, &mode))
1356 die("bad default revision '%s'", def);
1357 object = get_reference(revs, def, sha1, 0);
1358 add_pending_object_with_mode(revs, object, def, mode);
1359 }
1360
1361 /* Did the user ask for any diff output? Run the diff! */
1362 if (revs->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT)
1363 revs->diff = 1;
1364
1365 /* Pickaxe, diff-filter and rename following need diffs */
1366 if (revs->diffopt.pickaxe ||
1367 revs->diffopt.filter ||
1368 DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
1369 revs->diff = 1;
1370
1371 if (revs->topo_order)
1372 revs->limited = 1;
1373
1374 if (revs->prune_data) {
1375 diff_tree_setup_paths(revs->prune_data, &revs->pruning);
1376 /* Can't prune commits with rename following: the paths change.. */
1377 if (!DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
1378 revs->prune = 1;
1379 if (!revs->full_diff)
1380 diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
1381 }
1382 if (revs->combine_merges) {
1383 revs->ignore_merges = 0;
1384 if (revs->dense_combined_merges && !revs->diffopt.output_format)
1385 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
1386 }
1387 revs->diffopt.abbrev = revs->abbrev;
1388 if (diff_setup_done(&revs->diffopt) < 0)
1389 die("diff_setup_done failed");
1390
1391 if (revs->grep_filter) {
1392 revs->grep_filter->all_match = all_match;
1393 compile_grep_patterns(revs->grep_filter);
1394 }
1395
1396 if (revs->reverse && revs->reflog_info)
1397 die("cannot combine --reverse with --walk-reflogs");
1398
1399 return left;
1400 }
1401
1402 int prepare_revision_walk(struct rev_info *revs)
1403 {
1404 int nr = revs->pending.nr;
1405 struct object_array_entry *e, *list;
1406
1407 e = list = revs->pending.objects;
1408 revs->pending.nr = 0;
1409 revs->pending.alloc = 0;
1410 revs->pending.objects = NULL;
1411 while (--nr >= 0) {
1412 struct commit *commit = handle_commit(revs, e->item, e->name);
1413 if (commit) {
1414 if (!(commit->object.flags & SEEN)) {
1415 commit->object.flags |= SEEN;
1416 insert_by_date(commit, &revs->commits);
1417 }
1418 }
1419 e++;
1420 }
1421 free(list);
1422
1423 if (revs->no_walk)
1424 return 0;
1425 if (revs->limited)
1426 if (limit_list(revs) < 0)
1427 return -1;
1428 if (revs->topo_order)
1429 sort_in_topological_order(&revs->commits, revs->lifo);
1430 return 0;
1431 }
1432
1433 enum rewrite_result {
1434 rewrite_one_ok,
1435 rewrite_one_noparents,
1436 rewrite_one_error,
1437 };
1438
1439 static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
1440 {
1441 for (;;) {
1442 struct commit *p = *pp;
1443 if (!revs->limited)
1444 if (add_parents_to_list(revs, p, &revs->commits) < 0)
1445 return rewrite_one_error;
1446 if (p->parents && p->parents->next)
1447 return rewrite_one_ok;
1448 if (p->object.flags & UNINTERESTING)
1449 return rewrite_one_ok;
1450 if (!(p->object.flags & TREESAME))
1451 return rewrite_one_ok;
1452 if (!p->parents)
1453 return rewrite_one_noparents;
1454 *pp = p->parents->item;
1455 }
1456 }
1457
1458 static void remove_duplicate_parents(struct commit *commit)
1459 {
1460 struct commit_list **pp, *p;
1461
1462 /* Examine existing parents while marking ones we have seen... */
1463 pp = &commit->parents;
1464 while ((p = *pp) != NULL) {
1465 struct commit *parent = p->item;
1466 if (parent->object.flags & TMP_MARK) {
1467 *pp = p->next;
1468 continue;
1469 }
1470 parent->object.flags |= TMP_MARK;
1471 pp = &p->next;
1472 }
1473 /* ... and clear the temporary mark */
1474 for (p = commit->parents; p; p = p->next)
1475 p->item->object.flags &= ~TMP_MARK;
1476 }
1477
1478 static int rewrite_parents(struct rev_info *revs, struct commit *commit)
1479 {
1480 struct commit_list **pp = &commit->parents;
1481 while (*pp) {
1482 struct commit_list *parent = *pp;
1483 switch (rewrite_one(revs, &parent->item)) {
1484 case rewrite_one_ok:
1485 break;
1486 case rewrite_one_noparents:
1487 *pp = parent->next;
1488 continue;
1489 case rewrite_one_error:
1490 return -1;
1491 }
1492 pp = &parent->next;
1493 }
1494 remove_duplicate_parents(commit);
1495 return 0;
1496 }
1497
1498 static int commit_match(struct commit *commit, struct rev_info *opt)
1499 {
1500 if (!opt->grep_filter)
1501 return 1;
1502 return grep_buffer(opt->grep_filter,
1503 NULL, /* we say nothing, not even filename */
1504 commit->buffer, strlen(commit->buffer));
1505 }
1506
1507 enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
1508 {
1509 if (commit->object.flags & SHOWN)
1510 return commit_ignore;
1511 if (revs->unpacked && has_sha1_pack(commit->object.sha1, revs->ignore_packed))
1512 return commit_ignore;
1513 if (revs->show_all)
1514 return commit_show;
1515 if (commit->object.flags & UNINTERESTING)
1516 return commit_ignore;
1517 if (revs->min_age != -1 && (commit->date > revs->min_age))
1518 return commit_ignore;
1519 if (revs->no_merges && commit->parents && commit->parents->next)
1520 return commit_ignore;
1521 if (!commit_match(commit, revs))
1522 return commit_ignore;
1523 if (revs->prune && revs->dense) {
1524 /* Commit without changes? */
1525 if (commit->object.flags & TREESAME) {
1526 /* drop merges unless we want parenthood */
1527 if (!revs->parents)
1528 return commit_ignore;
1529 /* non-merge - always ignore it */
1530 if (!commit->parents || !commit->parents->next)
1531 return commit_ignore;
1532 }
1533 if (revs->parents && rewrite_parents(revs, commit) < 0)
1534 return commit_error;
1535 }
1536 return commit_show;
1537 }
1538
1539 static struct commit *get_revision_1(struct rev_info *revs)
1540 {
1541 if (!revs->commits)
1542 return NULL;
1543
1544 do {
1545 struct commit_list *entry = revs->commits;
1546 struct commit *commit = entry->item;
1547
1548 revs->commits = entry->next;
1549 free(entry);
1550
1551 if (revs->reflog_info)
1552 fake_reflog_parent(revs->reflog_info, commit);
1553
1554 /*
1555 * If we haven't done the list limiting, we need to look at
1556 * the parents here. We also need to do the date-based limiting
1557 * that we'd otherwise have done in limit_list().
1558 */
1559 if (!revs->limited) {
1560 if (revs->max_age != -1 &&
1561 (commit->date < revs->max_age))
1562 continue;
1563 if (add_parents_to_list(revs, commit, &revs->commits) < 0)
1564 return NULL;
1565 }
1566
1567 switch (simplify_commit(revs, commit)) {
1568 case commit_ignore:
1569 continue;
1570 case commit_error:
1571 return NULL;
1572 default:
1573 return commit;
1574 }
1575 } while (revs->commits);
1576 return NULL;
1577 }
1578
1579 static void gc_boundary(struct object_array *array)
1580 {
1581 unsigned nr = array->nr;
1582 unsigned alloc = array->alloc;
1583 struct object_array_entry *objects = array->objects;
1584
1585 if (alloc <= nr) {
1586 unsigned i, j;
1587 for (i = j = 0; i < nr; i++) {
1588 if (objects[i].item->flags & SHOWN)
1589 continue;
1590 if (i != j)
1591 objects[j] = objects[i];
1592 j++;
1593 }
1594 for (i = j; i < nr; i++)
1595 objects[i].item = NULL;
1596 array->nr = j;
1597 }
1598 }
1599
1600 struct commit *get_revision(struct rev_info *revs)
1601 {
1602 struct commit *c = NULL;
1603 struct commit_list *l;
1604
1605 if (revs->boundary == 2) {
1606 unsigned i;
1607 struct object_array *array = &revs->boundary_commits;
1608 struct object_array_entry *objects = array->objects;
1609 for (i = 0; i < array->nr; i++) {
1610 c = (struct commit *)(objects[i].item);
1611 if (!c)
1612 continue;
1613 if (!(c->object.flags & CHILD_SHOWN))
1614 continue;
1615 if (!(c->object.flags & SHOWN))
1616 break;
1617 }
1618 if (array->nr <= i)
1619 return NULL;
1620
1621 c->object.flags |= SHOWN | BOUNDARY;
1622 return c;
1623 }
1624
1625 if (revs->reverse) {
1626 int limit = -1;
1627
1628 if (0 <= revs->max_count) {
1629 limit = revs->max_count;
1630 if (0 < revs->skip_count)
1631 limit += revs->skip_count;
1632 }
1633 l = NULL;
1634 while ((c = get_revision_1(revs))) {
1635 commit_list_insert(c, &l);
1636 if ((0 < limit) && !--limit)
1637 break;
1638 }
1639 revs->commits = l;
1640 revs->reverse = 0;
1641 revs->max_count = -1;
1642 c = NULL;
1643 }
1644
1645 /*
1646 * Now pick up what they want to give us
1647 */
1648 c = get_revision_1(revs);
1649 if (c) {
1650 while (0 < revs->skip_count) {
1651 revs->skip_count--;
1652 c = get_revision_1(revs);
1653 if (!c)
1654 break;
1655 }
1656 }
1657
1658 /*
1659 * Check the max_count.
1660 */
1661 switch (revs->max_count) {
1662 case -1:
1663 break;
1664 case 0:
1665 c = NULL;
1666 break;
1667 default:
1668 revs->max_count--;
1669 }
1670
1671 if (c)
1672 c->object.flags |= SHOWN;
1673
1674 if (!revs->boundary) {
1675 return c;
1676 }
1677
1678 if (!c) {
1679 /*
1680 * get_revision_1() runs out the commits, and
1681 * we are done computing the boundaries.
1682 * switch to boundary commits output mode.
1683 */
1684 revs->boundary = 2;
1685 return get_revision(revs);
1686 }
1687
1688 /*
1689 * boundary commits are the commits that are parents of the
1690 * ones we got from get_revision_1() but they themselves are
1691 * not returned from get_revision_1(). Before returning
1692 * 'c', we need to mark its parents that they could be boundaries.
1693 */
1694
1695 for (l = c->parents; l; l = l->next) {
1696 struct object *p;
1697 p = &(l->item->object);
1698 if (p->flags & (CHILD_SHOWN | SHOWN))
1699 continue;
1700 p->flags |= CHILD_SHOWN;
1701 gc_boundary(&revs->boundary_commits);
1702 add_object_array(p, NULL, &revs->boundary_commits);
1703 }
1704
1705 return c;
1706 }