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Add pretty format %aN which gives the author name, respecting .mailmap
[git/gitweb.git] / revision.c
blobfc667552592daa3c894d0df4e97469d1809dbf27
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
14 volatile show_early_output_fn_t show_early_output;
15
16 static char *path_name(struct name_path *path, const char *name)
17 {
18 struct name_path *p;
19 char *n, *m;
20 int nlen = strlen(name);
21 int len = nlen + 1;
22
23 for (p = path; p; p = p->up) {
24 if (p->elem_len)
25 len += p->elem_len + 1;
26 }
27 n = xmalloc(len);
28 m = n + len - (nlen + 1);
29 strcpy(m, name);
30 for (p = path; p; p = p->up) {
31 if (p->elem_len) {
32 m -= p->elem_len + 1;
33 memcpy(m, p->elem, p->elem_len);
34 m[p->elem_len] = '/';
35 }
36 }
37 return n;
38 }
39
40 void add_object(struct object *obj,
41 struct object_array *p,
42 struct name_path *path,
43 const char *name)
44 {
45 add_object_array(obj, path_name(path, name), p);
46 }
47
48 static void mark_blob_uninteresting(struct blob *blob)
49 {
50 if (!blob)
51 return;
52 if (blob->object.flags & UNINTERESTING)
53 return;
54 blob->object.flags |= UNINTERESTING;
55 }
56
57 void mark_tree_uninteresting(struct tree *tree)
58 {
59 struct tree_desc desc;
60 struct name_entry entry;
61 struct object *obj = &tree->object;
62
63 if (!tree)
64 return;
65 if (obj->flags & UNINTERESTING)
66 return;
67 obj->flags |= UNINTERESTING;
68 if (!has_sha1_file(obj->sha1))
69 return;
70 if (parse_tree(tree) < 0)
71 die("bad tree %s", sha1_to_hex(obj->sha1));
72
73 init_tree_desc(&desc, tree->buffer, tree->size);
74 while (tree_entry(&desc, &entry)) {
75 switch (object_type(entry.mode)) {
76 case OBJ_TREE:
77 mark_tree_uninteresting(lookup_tree(entry.sha1));
78 break;
79 case OBJ_BLOB:
80 mark_blob_uninteresting(lookup_blob(entry.sha1));
81 break;
82 default:
83 /* Subproject commit - not in this repository */
84 break;
85 }
86 }
87
88 /*
89 * We don't care about the tree any more
90 * after it has been marked uninteresting.
91 */
92 free(tree->buffer);
93 tree->buffer = NULL;
94 }
95
96 void mark_parents_uninteresting(struct commit *commit)
97 {
98 struct commit_list *parents = commit->parents;
99
100 while (parents) {
101 struct commit *commit = parents->item;
102 if (!(commit->object.flags & UNINTERESTING)) {
103 commit->object.flags |= UNINTERESTING;
104
105 /*
106 * Normally we haven't parsed the parent
107 * yet, so we won't have a parent of a parent
108 * here. However, it may turn out that we've
109 * reached this commit some other way (where it
110 * wasn't uninteresting), in which case we need
111 * to mark its parents recursively too..
112 */
113 if (commit->parents)
114 mark_parents_uninteresting(commit);
115 }
116
117 /*
118 * A missing commit is ok iff its parent is marked
119 * uninteresting.
120 *
121 * We just mark such a thing parsed, so that when
122 * it is popped next time around, we won't be trying
123 * to parse it and get an error.
124 */
125 if (!has_sha1_file(commit->object.sha1))
126 commit->object.parsed = 1;
127 parents = parents->next;
128 }
129 }
130
131 static void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode)
132 {
133 if (revs->no_walk && (obj->flags & UNINTERESTING))
134 die("object ranges do not make sense when not walking revisions");
135 if (revs->reflog_info && obj->type == OBJ_COMMIT &&
136 add_reflog_for_walk(revs->reflog_info,
137 (struct commit *)obj, name))
138 return;
139 add_object_array_with_mode(obj, name, &revs->pending, mode);
140 }
141
142 void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
143 {
144 add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
145 }
146
147 void add_head_to_pending(struct rev_info *revs)
148 {
149 unsigned char sha1[20];
150 struct object *obj;
151 if (get_sha1("HEAD", sha1))
152 return;
153 obj = parse_object(sha1);
154 if (!obj)
155 return;
156 add_pending_object(revs, obj, "HEAD");
157 }
158
159 static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
160 {
161 struct object *object;
162
163 object = parse_object(sha1);
164 if (!object)
165 die("bad object %s", name);
166 object->flags |= flags;
167 return object;
168 }
169
170 static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
171 {
172 unsigned long flags = object->flags;
173
174 /*
175 * Tag object? Look what it points to..
176 */
177 while (object->type == OBJ_TAG) {
178 struct tag *tag = (struct tag *) object;
179 if (revs->tag_objects && !(flags & UNINTERESTING))
180 add_pending_object(revs, object, tag->tag);
181 if (!tag->tagged)
182 die("bad tag");
183 object = parse_object(tag->tagged->sha1);
184 if (!object)
185 die("bad object %s", sha1_to_hex(tag->tagged->sha1));
186 }
187
188 /*
189 * Commit object? Just return it, we'll do all the complex
190 * reachability crud.
191 */
192 if (object->type == OBJ_COMMIT) {
193 struct commit *commit = (struct commit *)object;
194 if (parse_commit(commit) < 0)
195 die("unable to parse commit %s", name);
196 if (flags & UNINTERESTING) {
197 commit->object.flags |= UNINTERESTING;
198 mark_parents_uninteresting(commit);
199 revs->limited = 1;
200 }
201 return commit;
202 }
203
204 /*
205 * Tree object? Either mark it uniniteresting, or add it
206 * to the list of objects to look at later..
207 */
208 if (object->type == OBJ_TREE) {
209 struct tree *tree = (struct tree *)object;
210 if (!revs->tree_objects)
211 return NULL;
212 if (flags & UNINTERESTING) {
213 mark_tree_uninteresting(tree);
214 return NULL;
215 }
216 add_pending_object(revs, object, "");
217 return NULL;
218 }
219
220 /*
221 * Blob object? You know the drill by now..
222 */
223 if (object->type == OBJ_BLOB) {
224 struct blob *blob = (struct blob *)object;
225 if (!revs->blob_objects)
226 return NULL;
227 if (flags & UNINTERESTING) {
228 mark_blob_uninteresting(blob);
229 return NULL;
230 }
231 add_pending_object(revs, object, "");
232 return NULL;
233 }
234 die("%s is unknown object", name);
235 }
236
237 static int everybody_uninteresting(struct commit_list *orig)
238 {
239 struct commit_list *list = orig;
240 while (list) {
241 struct commit *commit = list->item;
242 list = list->next;
243 if (commit->object.flags & UNINTERESTING)
244 continue;
245 return 0;
246 }
247 return 1;
248 }
249
250 /*
251 * The goal is to get REV_TREE_NEW as the result only if the
252 * diff consists of all '+' (and no other changes), and
253 * REV_TREE_DIFFERENT otherwise (of course if the trees are
254 * the same we want REV_TREE_SAME). That means that once we
255 * get to REV_TREE_DIFFERENT, we do not have to look any further.
256 */
257 static int tree_difference = REV_TREE_SAME;
258
259 static void file_add_remove(struct diff_options *options,
260 int addremove, unsigned mode,
261 const unsigned char *sha1,
262 const char *base, const char *path)
263 {
264 int diff = REV_TREE_DIFFERENT;
265
266 /*
267 * Is it an add of a new file? It means that the old tree
268 * didn't have it at all, so we will turn "REV_TREE_SAME" ->
269 * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
270 * (and if it already was "REV_TREE_NEW", we'll keep it
271 * "REV_TREE_NEW" of course).
272 */
273 if (addremove == '+') {
274 diff = tree_difference;
275 if (diff != REV_TREE_SAME)
276 return;
277 diff = REV_TREE_NEW;
278 }
279 tree_difference = diff;
280 if (tree_difference == REV_TREE_DIFFERENT)
281 DIFF_OPT_SET(options, HAS_CHANGES);
282 }
283
284 static void file_change(struct diff_options *options,
285 unsigned old_mode, unsigned new_mode,
286 const unsigned char *old_sha1,
287 const unsigned char *new_sha1,
288 const char *base, const char *path)
289 {
290 tree_difference = REV_TREE_DIFFERENT;
291 DIFF_OPT_SET(options, HAS_CHANGES);
292 }
293
294 static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
295 {
296 if (!t1)
297 return REV_TREE_NEW;
298 if (!t2)
299 return REV_TREE_DIFFERENT;
300 tree_difference = REV_TREE_SAME;
301 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
302 if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
303 &revs->pruning) < 0)
304 return REV_TREE_DIFFERENT;
305 return tree_difference;
306 }
307
308 static int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
309 {
310 int retval;
311 void *tree;
312 unsigned long size;
313 struct tree_desc empty, real;
314
315 if (!t1)
316 return 0;
317
318 tree = read_object_with_reference(t1->object.sha1, tree_type, &size, NULL);
319 if (!tree)
320 return 0;
321 init_tree_desc(&real, tree, size);
322 init_tree_desc(&empty, "", 0);
323
324 tree_difference = REV_TREE_SAME;
325 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
326 retval = diff_tree(&empty, &real, "", &revs->pruning);
327 free(tree);
328
329 return retval >= 0 && (tree_difference == REV_TREE_SAME);
330 }
331
332 static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
333 {
334 struct commit_list **pp, *parent;
335 int tree_changed = 0, tree_same = 0;
336
337 /*
338 * If we don't do pruning, everything is interesting
339 */
340 if (!revs->prune)
341 return;
342
343 if (!commit->tree)
344 return;
345
346 if (!commit->parents) {
347 if (rev_same_tree_as_empty(revs, commit->tree))
348 commit->object.flags |= TREESAME;
349 return;
350 }
351
352 /*
353 * Normal non-merge commit? If we don't want to make the
354 * history dense, we consider it always to be a change..
355 */
356 if (!revs->dense && !commit->parents->next)
357 return;
358
359 pp = &commit->parents;
360 while ((parent = *pp) != NULL) {
361 struct commit *p = parent->item;
362
363 if (parse_commit(p) < 0)
364 die("cannot simplify commit %s (because of %s)",
365 sha1_to_hex(commit->object.sha1),
366 sha1_to_hex(p->object.sha1));
367 switch (rev_compare_tree(revs, p->tree, commit->tree)) {
368 case REV_TREE_SAME:
369 tree_same = 1;
370 if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
371 /* Even if a merge with an uninteresting
372 * side branch brought the entire change
373 * we are interested in, we do not want
374 * to lose the other branches of this
375 * merge, so we just keep going.
376 */
377 pp = &parent->next;
378 continue;
379 }
380 parent->next = NULL;
381 commit->parents = parent;
382 commit->object.flags |= TREESAME;
383 return;
384
385 case REV_TREE_NEW:
386 if (revs->remove_empty_trees &&
387 rev_same_tree_as_empty(revs, p->tree)) {
388 /* We are adding all the specified
389 * paths from this parent, so the
390 * history beyond this parent is not
391 * interesting. Remove its parents
392 * (they are grandparents for us).
393 * IOW, we pretend this parent is a
394 * "root" commit.
395 */
396 if (parse_commit(p) < 0)
397 die("cannot simplify commit %s (invalid %s)",
398 sha1_to_hex(commit->object.sha1),
399 sha1_to_hex(p->object.sha1));
400 p->parents = NULL;
401 }
402 /* fallthrough */
403 case REV_TREE_DIFFERENT:
404 tree_changed = 1;
405 pp = &parent->next;
406 continue;
407 }
408 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
409 }
410 if (tree_changed && !tree_same)
411 return;
412 commit->object.flags |= TREESAME;
413 }
414
415 static int add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
416 {
417 struct commit_list *parent = commit->parents;
418 unsigned left_flag;
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 for (parent = commit->parents; parent; parent = parent->next) {
466 struct commit *p = parent->item;
467
468 if (parse_commit(p) < 0)
469 return -1;
470 p->object.flags |= left_flag;
471 if (!(p->object.flags & SEEN)) {
472 p->object.flags |= SEEN;
473 insert_by_date(p, list);
474 }
475 if(revs->first_parent_only)
476 break;
477 }
478 return 0;
479 }
480
481 static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
482 {
483 struct commit_list *p;
484 int left_count = 0, right_count = 0;
485 int left_first;
486 struct patch_ids ids;
487
488 /* First count the commits on the left and on the right */
489 for (p = list; p; p = p->next) {
490 struct commit *commit = p->item;
491 unsigned flags = commit->object.flags;
492 if (flags & BOUNDARY)
493 ;
494 else if (flags & SYMMETRIC_LEFT)
495 left_count++;
496 else
497 right_count++;
498 }
499
500 left_first = left_count < right_count;
501 init_patch_ids(&ids);
502 if (revs->diffopt.nr_paths) {
503 ids.diffopts.nr_paths = revs->diffopt.nr_paths;
504 ids.diffopts.paths = revs->diffopt.paths;
505 ids.diffopts.pathlens = revs->diffopt.pathlens;
506 }
507
508 /* Compute patch-ids for one side */
509 for (p = list; p; p = p->next) {
510 struct commit *commit = p->item;
511 unsigned flags = commit->object.flags;
512
513 if (flags & BOUNDARY)
514 continue;
515 /*
516 * If we have fewer left, left_first is set and we omit
517 * commits on the right branch in this loop. If we have
518 * fewer right, we skip the left ones.
519 */
520 if (left_first != !!(flags & SYMMETRIC_LEFT))
521 continue;
522 commit->util = add_commit_patch_id(commit, &ids);
523 }
524
525 /* Check the other side */
526 for (p = list; p; p = p->next) {
527 struct commit *commit = p->item;
528 struct patch_id *id;
529 unsigned flags = commit->object.flags;
530
531 if (flags & BOUNDARY)
532 continue;
533 /*
534 * If we have fewer left, left_first is set and we omit
535 * commits on the left branch in this loop.
536 */
537 if (left_first == !!(flags & SYMMETRIC_LEFT))
538 continue;
539
540 /*
541 * Have we seen the same patch id?
542 */
543 id = has_commit_patch_id(commit, &ids);
544 if (!id)
545 continue;
546 id->seen = 1;
547 commit->object.flags |= SHOWN;
548 }
549
550 /* Now check the original side for seen ones */
551 for (p = list; p; p = p->next) {
552 struct commit *commit = p->item;
553 struct patch_id *ent;
554
555 ent = commit->util;
556 if (!ent)
557 continue;
558 if (ent->seen)
559 commit->object.flags |= SHOWN;
560 commit->util = NULL;
561 }
562
563 free_patch_ids(&ids);
564 }
565
566 /* How many extra uninteresting commits we want to see.. */
567 #define SLOP 5
568
569 static int still_interesting(struct commit_list *src, unsigned long date, int slop)
570 {
571 /*
572 * No source list at all? We're definitely done..
573 */
574 if (!src)
575 return 0;
576
577 /*
578 * Does the destination list contain entries with a date
579 * before the source list? Definitely _not_ done.
580 */
581 if (date < src->item->date)
582 return SLOP;
583
584 /*
585 * Does the source list still have interesting commits in
586 * it? Definitely not done..
587 */
588 if (!everybody_uninteresting(src))
589 return SLOP;
590
591 /* Ok, we're closing in.. */
592 return slop-1;
593 }
594
595 static int limit_list(struct rev_info *revs)
596 {
597 int slop = SLOP;
598 unsigned long date = ~0ul;
599 struct commit_list *list = revs->commits;
600 struct commit_list *newlist = NULL;
601 struct commit_list **p = &newlist;
602
603 while (list) {
604 struct commit_list *entry = list;
605 struct commit *commit = list->item;
606 struct object *obj = &commit->object;
607 show_early_output_fn_t show;
608
609 list = list->next;
610 free(entry);
611
612 if (revs->max_age != -1 && (commit->date < revs->max_age))
613 obj->flags |= UNINTERESTING;
614 if (add_parents_to_list(revs, commit, &list) < 0)
615 return -1;
616 if (obj->flags & UNINTERESTING) {
617 mark_parents_uninteresting(commit);
618 if (revs->show_all)
619 p = &commit_list_insert(commit, p)->next;
620 slop = still_interesting(list, date, slop);
621 if (slop)
622 continue;
623 /* If showing all, add the whole pending list to the end */
624 if (revs->show_all)
625 *p = list;
626 break;
627 }
628 if (revs->min_age != -1 && (commit->date > revs->min_age))
629 continue;
630 date = commit->date;
631 p = &commit_list_insert(commit, p)->next;
632
633 show = show_early_output;
634 if (!show)
635 continue;
636
637 show(revs, newlist);
638 show_early_output = NULL;
639 }
640 if (revs->cherry_pick)
641 cherry_pick_list(newlist, revs);
642
643 revs->commits = newlist;
644 return 0;
645 }
646
647 struct all_refs_cb {
648 int all_flags;
649 int warned_bad_reflog;
650 struct rev_info *all_revs;
651 const char *name_for_errormsg;
652 };
653
654 static int handle_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
655 {
656 struct all_refs_cb *cb = cb_data;
657 struct object *object = get_reference(cb->all_revs, path, sha1,
658 cb->all_flags);
659 add_pending_object(cb->all_revs, object, path);
660 return 0;
661 }
662
663 static void handle_refs(struct rev_info *revs, unsigned flags,
664 int (*for_each)(each_ref_fn, void *))
665 {
666 struct all_refs_cb cb;
667 cb.all_revs = revs;
668 cb.all_flags = flags;
669 for_each(handle_one_ref, &cb);
670 }
671
672 static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
673 {
674 struct all_refs_cb *cb = cb_data;
675 if (!is_null_sha1(sha1)) {
676 struct object *o = parse_object(sha1);
677 if (o) {
678 o->flags |= cb->all_flags;
679 add_pending_object(cb->all_revs, o, "");
680 }
681 else if (!cb->warned_bad_reflog) {
682 warning("reflog of '%s' references pruned commits",
683 cb->name_for_errormsg);
684 cb->warned_bad_reflog = 1;
685 }
686 }
687 }
688
689 static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
690 const char *email, unsigned long timestamp, int tz,
691 const char *message, void *cb_data)
692 {
693 handle_one_reflog_commit(osha1, cb_data);
694 handle_one_reflog_commit(nsha1, cb_data);
695 return 0;
696 }
697
698 static int handle_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
699 {
700 struct all_refs_cb *cb = cb_data;
701 cb->warned_bad_reflog = 0;
702 cb->name_for_errormsg = path;
703 for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
704 return 0;
705 }
706
707 static void handle_reflog(struct rev_info *revs, unsigned flags)
708 {
709 struct all_refs_cb cb;
710 cb.all_revs = revs;
711 cb.all_flags = flags;
712 for_each_reflog(handle_one_reflog, &cb);
713 }
714
715 static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
716 {
717 unsigned char sha1[20];
718 struct object *it;
719 struct commit *commit;
720 struct commit_list *parents;
721
722 if (*arg == '^') {
723 flags ^= UNINTERESTING;
724 arg++;
725 }
726 if (get_sha1(arg, sha1))
727 return 0;
728 while (1) {
729 it = get_reference(revs, arg, sha1, 0);
730 if (it->type != OBJ_TAG)
731 break;
732 if (!((struct tag*)it)->tagged)
733 return 0;
734 hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
735 }
736 if (it->type != OBJ_COMMIT)
737 return 0;
738 commit = (struct commit *)it;
739 for (parents = commit->parents; parents; parents = parents->next) {
740 it = &parents->item->object;
741 it->flags |= flags;
742 add_pending_object(revs, it, arg);
743 }
744 return 1;
745 }
746
747 void init_revisions(struct rev_info *revs, const char *prefix)
748 {
749 memset(revs, 0, sizeof(*revs));
750
751 revs->abbrev = DEFAULT_ABBREV;
752 revs->ignore_merges = 1;
753 revs->simplify_history = 1;
754 DIFF_OPT_SET(&revs->pruning, RECURSIVE);
755 DIFF_OPT_SET(&revs->pruning, QUIET);
756 revs->pruning.add_remove = file_add_remove;
757 revs->pruning.change = file_change;
758 revs->lifo = 1;
759 revs->dense = 1;
760 revs->prefix = prefix;
761 revs->max_age = -1;
762 revs->min_age = -1;
763 revs->skip_count = -1;
764 revs->max_count = -1;
765
766 revs->commit_format = CMIT_FMT_DEFAULT;
767
768 diff_setup(&revs->diffopt);
769 if (prefix && !revs->diffopt.prefix) {
770 revs->diffopt.prefix = prefix;
771 revs->diffopt.prefix_length = strlen(prefix);
772 }
773 }
774
775 static void add_pending_commit_list(struct rev_info *revs,
776 struct commit_list *commit_list,
777 unsigned int flags)
778 {
779 while (commit_list) {
780 struct object *object = &commit_list->item->object;
781 object->flags |= flags;
782 add_pending_object(revs, object, sha1_to_hex(object->sha1));
783 commit_list = commit_list->next;
784 }
785 }
786
787 static void prepare_show_merge(struct rev_info *revs)
788 {
789 struct commit_list *bases;
790 struct commit *head, *other;
791 unsigned char sha1[20];
792 const char **prune = NULL;
793 int i, prune_num = 1; /* counting terminating NULL */
794
795 if (get_sha1("HEAD", sha1) || !(head = lookup_commit(sha1)))
796 die("--merge without HEAD?");
797 if (get_sha1("MERGE_HEAD", sha1) || !(other = lookup_commit(sha1)))
798 die("--merge without MERGE_HEAD?");
799 add_pending_object(revs, &head->object, "HEAD");
800 add_pending_object(revs, &other->object, "MERGE_HEAD");
801 bases = get_merge_bases(head, other, 1);
802 add_pending_commit_list(revs, bases, UNINTERESTING);
803 free_commit_list(bases);
804 head->object.flags |= SYMMETRIC_LEFT;
805
806 if (!active_nr)
807 read_cache();
808 for (i = 0; i < active_nr; i++) {
809 struct cache_entry *ce = active_cache[i];
810 if (!ce_stage(ce))
811 continue;
812 if (ce_path_match(ce, revs->prune_data)) {
813 prune_num++;
814 prune = xrealloc(prune, sizeof(*prune) * prune_num);
815 prune[prune_num-2] = ce->name;
816 prune[prune_num-1] = NULL;
817 }
818 while ((i+1 < active_nr) &&
819 ce_same_name(ce, active_cache[i+1]))
820 i++;
821 }
822 revs->prune_data = prune;
823 revs->limited = 1;
824 }
825
826 int handle_revision_arg(const char *arg, struct rev_info *revs,
827 int flags,
828 int cant_be_filename)
829 {
830 unsigned mode;
831 char *dotdot;
832 struct object *object;
833 unsigned char sha1[20];
834 int local_flags;
835
836 dotdot = strstr(arg, "..");
837 if (dotdot) {
838 unsigned char from_sha1[20];
839 const char *next = dotdot + 2;
840 const char *this = arg;
841 int symmetric = *next == '.';
842 unsigned int flags_exclude = flags ^ UNINTERESTING;
843
844 *dotdot = 0;
845 next += symmetric;
846
847 if (!*next)
848 next = "HEAD";
849 if (dotdot == arg)
850 this = "HEAD";
851 if (!get_sha1(this, from_sha1) &&
852 !get_sha1(next, sha1)) {
853 struct commit *a, *b;
854 struct commit_list *exclude;
855
856 a = lookup_commit_reference(from_sha1);
857 b = lookup_commit_reference(sha1);
858 if (!a || !b) {
859 die(symmetric ?
860 "Invalid symmetric difference expression %s...%s" :
861 "Invalid revision range %s..%s",
862 arg, next);
863 }
864
865 if (!cant_be_filename) {
866 *dotdot = '.';
867 verify_non_filename(revs->prefix, arg);
868 }
869
870 if (symmetric) {
871 exclude = get_merge_bases(a, b, 1);
872 add_pending_commit_list(revs, exclude,
873 flags_exclude);
874 free_commit_list(exclude);
875 a->object.flags |= flags | SYMMETRIC_LEFT;
876 } else
877 a->object.flags |= flags_exclude;
878 b->object.flags |= flags;
879 add_pending_object(revs, &a->object, this);
880 add_pending_object(revs, &b->object, next);
881 return 0;
882 }
883 *dotdot = '.';
884 }
885 dotdot = strstr(arg, "^@");
886 if (dotdot && !dotdot[2]) {
887 *dotdot = 0;
888 if (add_parents_only(revs, arg, flags))
889 return 0;
890 *dotdot = '^';
891 }
892 dotdot = strstr(arg, "^!");
893 if (dotdot && !dotdot[2]) {
894 *dotdot = 0;
895 if (!add_parents_only(revs, arg, flags ^ UNINTERESTING))
896 *dotdot = '^';
897 }
898
899 local_flags = 0;
900 if (*arg == '^') {
901 local_flags = UNINTERESTING;
902 arg++;
903 }
904 if (get_sha1_with_mode(arg, sha1, &mode))
905 return -1;
906 if (!cant_be_filename)
907 verify_non_filename(revs->prefix, arg);
908 object = get_reference(revs, arg, sha1, flags ^ local_flags);
909 add_pending_object_with_mode(revs, object, arg, mode);
910 return 0;
911 }
912
913 static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
914 {
915 if (!revs->grep_filter) {
916 struct grep_opt *opt = xcalloc(1, sizeof(*opt));
917 opt->status_only = 1;
918 opt->pattern_tail = &(opt->pattern_list);
919 opt->regflags = REG_NEWLINE;
920 revs->grep_filter = opt;
921 }
922 append_grep_pattern(revs->grep_filter, ptn,
923 "command line", 0, what);
924 }
925
926 static void add_header_grep(struct rev_info *revs, const char *field, const char *pattern)
927 {
928 char *pat;
929 const char *prefix;
930 int patlen, fldlen;
931
932 fldlen = strlen(field);
933 patlen = strlen(pattern);
934 pat = xmalloc(patlen + fldlen + 10);
935 prefix = ".*";
936 if (*pattern == '^') {
937 prefix = "";
938 pattern++;
939 }
940 sprintf(pat, "^%s %s%s", field, prefix, pattern);
941 add_grep(revs, pat, GREP_PATTERN_HEAD);
942 }
943
944 static void add_message_grep(struct rev_info *revs, const char *pattern)
945 {
946 add_grep(revs, pattern, GREP_PATTERN_BODY);
947 }
948
949 static void add_ignore_packed(struct rev_info *revs, const char *name)
950 {
951 int num = ++revs->num_ignore_packed;
952
953 revs->ignore_packed = xrealloc(revs->ignore_packed,
954 sizeof(const char **) * (num + 1));
955 revs->ignore_packed[num-1] = name;
956 revs->ignore_packed[num] = NULL;
957 }
958
959 /*
960 * Parse revision information, filling in the "rev_info" structure,
961 * and removing the used arguments from the argument list.
962 *
963 * Returns the number of arguments left that weren't recognized
964 * (which are also moved to the head of the argument list)
965 */
966 int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
967 {
968 int i, flags, seen_dashdash, show_merge;
969 const char **unrecognized = argv + 1;
970 int left = 1;
971 int all_match = 0;
972 int regflags = 0;
973 int fixed = 0;
974
975 /* First, search for "--" */
976 seen_dashdash = 0;
977 for (i = 1; i < argc; i++) {
978 const char *arg = argv[i];
979 if (strcmp(arg, "--"))
980 continue;
981 argv[i] = NULL;
982 argc = i;
983 if (argv[i + 1])
984 revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
985 seen_dashdash = 1;
986 break;
987 }
988
989 flags = show_merge = 0;
990 for (i = 1; i < argc; i++) {
991 const char *arg = argv[i];
992 if (*arg == '-') {
993 int opts;
994 if (!prefixcmp(arg, "--max-count=")) {
995 revs->max_count = atoi(arg + 12);
996 continue;
997 }
998 if (!prefixcmp(arg, "--skip=")) {
999 revs->skip_count = atoi(arg + 7);
1000 continue;
1001 }
1002 /* accept -<digit>, like traditional "head" */
1003 if ((*arg == '-') && isdigit(arg[1])) {
1004 revs->max_count = atoi(arg + 1);
1005 continue;
1006 }
1007 if (!strcmp(arg, "-n")) {
1008 if (argc <= i + 1)
1009 die("-n requires an argument");
1010 revs->max_count = atoi(argv[++i]);
1011 continue;
1012 }
1013 if (!prefixcmp(arg, "-n")) {
1014 revs->max_count = atoi(arg + 2);
1015 continue;
1016 }
1017 if (!prefixcmp(arg, "--max-age=")) {
1018 revs->max_age = atoi(arg + 10);
1019 continue;
1020 }
1021 if (!prefixcmp(arg, "--since=")) {
1022 revs->max_age = approxidate(arg + 8);
1023 continue;
1024 }
1025 if (!prefixcmp(arg, "--after=")) {
1026 revs->max_age = approxidate(arg + 8);
1027 continue;
1028 }
1029 if (!prefixcmp(arg, "--min-age=")) {
1030 revs->min_age = atoi(arg + 10);
1031 continue;
1032 }
1033 if (!prefixcmp(arg, "--before=")) {
1034 revs->min_age = approxidate(arg + 9);
1035 continue;
1036 }
1037 if (!prefixcmp(arg, "--until=")) {
1038 revs->min_age = approxidate(arg + 8);
1039 continue;
1040 }
1041 if (!strcmp(arg, "--all")) {
1042 handle_refs(revs, flags, for_each_ref);
1043 continue;
1044 }
1045 if (!strcmp(arg, "--branches")) {
1046 handle_refs(revs, flags, for_each_branch_ref);
1047 continue;
1048 }
1049 if (!strcmp(arg, "--tags")) {
1050 handle_refs(revs, flags, for_each_tag_ref);
1051 continue;
1052 }
1053 if (!strcmp(arg, "--remotes")) {
1054 handle_refs(revs, flags, for_each_remote_ref);
1055 continue;
1056 }
1057 if (!strcmp(arg, "--first-parent")) {
1058 revs->first_parent_only = 1;
1059 continue;
1060 }
1061 if (!strcmp(arg, "--reflog")) {
1062 handle_reflog(revs, flags);
1063 continue;
1064 }
1065 if (!strcmp(arg, "-g") ||
1066 !strcmp(arg, "--walk-reflogs")) {
1067 init_reflog_walk(&revs->reflog_info);
1068 continue;
1069 }
1070 if (!strcmp(arg, "--not")) {
1071 flags ^= UNINTERESTING;
1072 continue;
1073 }
1074 if (!strcmp(arg, "--default")) {
1075 if (++i >= argc)
1076 die("bad --default argument");
1077 def = argv[i];
1078 continue;
1079 }
1080 if (!strcmp(arg, "--merge")) {
1081 show_merge = 1;
1082 continue;
1083 }
1084 if (!strcmp(arg, "--topo-order")) {
1085 revs->lifo = 1;
1086 revs->topo_order = 1;
1087 continue;
1088 }
1089 if (!strcmp(arg, "--date-order")) {
1090 revs->lifo = 0;
1091 revs->topo_order = 1;
1092 continue;
1093 }
1094 if (!prefixcmp(arg, "--early-output")) {
1095 int count = 100;
1096 switch (arg[14]) {
1097 case '=':
1098 count = atoi(arg+15);
1099 /* Fallthrough */
1100 case 0:
1101 revs->topo_order = 1;
1102 revs->early_output = count;
1103 continue;
1104 }
1105 }
1106 if (!strcmp(arg, "--parents")) {
1107 revs->rewrite_parents = 1;
1108 revs->print_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 (!strcmp(arg, "--pretty")) {
1201 revs->verbose_header = 1;
1202 get_commit_format(arg+8, revs);
1203 continue;
1204 }
1205 if (!prefixcmp(arg, "--pretty=")) {
1206 revs->verbose_header = 1;
1207 get_commit_format(arg+9, revs);
1208 continue;
1209 }
1210 if (!strcmp(arg, "--graph")) {
1211 revs->topo_order = 1;
1212 revs->rewrite_parents = 1;
1213 revs->graph = graph_init(revs);
1214 continue;
1215 }
1216 if (!strcmp(arg, "--root")) {
1217 revs->show_root_diff = 1;
1218 continue;
1219 }
1220 if (!strcmp(arg, "--no-commit-id")) {
1221 revs->no_commit_id = 1;
1222 continue;
1223 }
1224 if (!strcmp(arg, "--always")) {
1225 revs->always_show_header = 1;
1226 continue;
1227 }
1228 if (!strcmp(arg, "--no-abbrev")) {
1229 revs->abbrev = 0;
1230 continue;
1231 }
1232 if (!strcmp(arg, "--abbrev")) {
1233 revs->abbrev = DEFAULT_ABBREV;
1234 continue;
1235 }
1236 if (!prefixcmp(arg, "--abbrev=")) {
1237 revs->abbrev = strtoul(arg + 9, NULL, 10);
1238 if (revs->abbrev < MINIMUM_ABBREV)
1239 revs->abbrev = MINIMUM_ABBREV;
1240 else if (revs->abbrev > 40)
1241 revs->abbrev = 40;
1242 continue;
1243 }
1244 if (!strcmp(arg, "--abbrev-commit")) {
1245 revs->abbrev_commit = 1;
1246 continue;
1247 }
1248 if (!strcmp(arg, "--full-diff")) {
1249 revs->diff = 1;
1250 revs->full_diff = 1;
1251 continue;
1252 }
1253 if (!strcmp(arg, "--full-history")) {
1254 revs->simplify_history = 0;
1255 continue;
1256 }
1257 if (!strcmp(arg, "--relative-date")) {
1258 revs->date_mode = DATE_RELATIVE;
1259 continue;
1260 }
1261 if (!strncmp(arg, "--date=", 7)) {
1262 revs->date_mode = parse_date_format(arg + 7);
1263 continue;
1264 }
1265 if (!strcmp(arg, "--log-size")) {
1266 revs->show_log_size = 1;
1267 continue;
1268 }
1269
1270 /*
1271 * Grepping the commit log
1272 */
1273 if (!prefixcmp(arg, "--author=")) {
1274 add_header_grep(revs, "author", arg+9);
1275 continue;
1276 }
1277 if (!prefixcmp(arg, "--committer=")) {
1278 add_header_grep(revs, "committer", arg+12);
1279 continue;
1280 }
1281 if (!prefixcmp(arg, "--grep=")) {
1282 add_message_grep(revs, arg+7);
1283 continue;
1284 }
1285 if (!strcmp(arg, "--extended-regexp") ||
1286 !strcmp(arg, "-E")) {
1287 regflags |= REG_EXTENDED;
1288 continue;
1289 }
1290 if (!strcmp(arg, "--regexp-ignore-case") ||
1291 !strcmp(arg, "-i")) {
1292 regflags |= REG_ICASE;
1293 continue;
1294 }
1295 if (!strcmp(arg, "--fixed-strings") ||
1296 !strcmp(arg, "-F")) {
1297 fixed = 1;
1298 continue;
1299 }
1300 if (!strcmp(arg, "--all-match")) {
1301 all_match = 1;
1302 continue;
1303 }
1304 if (!prefixcmp(arg, "--encoding=")) {
1305 arg += 11;
1306 if (strcmp(arg, "none"))
1307 git_log_output_encoding = xstrdup(arg);
1308 else
1309 git_log_output_encoding = "";
1310 continue;
1311 }
1312 if (!strcmp(arg, "--reverse")) {
1313 revs->reverse ^= 1;
1314 continue;
1315 }
1316 if (!strcmp(arg, "--no-walk")) {
1317 revs->no_walk = 1;
1318 continue;
1319 }
1320 if (!strcmp(arg, "--do-walk")) {
1321 revs->no_walk = 0;
1322 continue;
1323 }
1324
1325 opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
1326 if (opts > 0) {
1327 i += opts - 1;
1328 continue;
1329 }
1330 *unrecognized++ = arg;
1331 left++;
1332 continue;
1333 }
1334
1335 if (handle_revision_arg(arg, revs, flags, seen_dashdash)) {
1336 int j;
1337 if (seen_dashdash || *arg == '^')
1338 die("bad revision '%s'", arg);
1339
1340 /* If we didn't have a "--":
1341 * (1) all filenames must exist;
1342 * (2) all rev-args must not be interpretable
1343 * as a valid filename.
1344 * but the latter we have checked in the main loop.
1345 */
1346 for (j = i; j < argc; j++)
1347 verify_filename(revs->prefix, argv[j]);
1348
1349 revs->prune_data = get_pathspec(revs->prefix,
1350 argv + i);
1351 break;
1352 }
1353 }
1354
1355 if (revs->grep_filter) {
1356 revs->grep_filter->regflags |= regflags;
1357 revs->grep_filter->fixed = fixed;
1358 }
1359
1360 if (show_merge)
1361 prepare_show_merge(revs);
1362 if (def && !revs->pending.nr) {
1363 unsigned char sha1[20];
1364 struct object *object;
1365 unsigned mode;
1366 if (get_sha1_with_mode(def, sha1, &mode))
1367 die("bad default revision '%s'", def);
1368 object = get_reference(revs, def, sha1, 0);
1369 add_pending_object_with_mode(revs, object, def, mode);
1370 }
1371
1372 /* Did the user ask for any diff output? Run the diff! */
1373 if (revs->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT)
1374 revs->diff = 1;
1375
1376 /* Pickaxe, diff-filter and rename following need diffs */
1377 if (revs->diffopt.pickaxe ||
1378 revs->diffopt.filter ||
1379 DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
1380 revs->diff = 1;
1381
1382 if (revs->topo_order)
1383 revs->limited = 1;
1384
1385 if (revs->prune_data) {
1386 diff_tree_setup_paths(revs->prune_data, &revs->pruning);
1387 /* Can't prune commits with rename following: the paths change.. */
1388 if (!DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
1389 revs->prune = 1;
1390 if (!revs->full_diff)
1391 diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
1392 }
1393 if (revs->combine_merges) {
1394 revs->ignore_merges = 0;
1395 if (revs->dense_combined_merges && !revs->diffopt.output_format)
1396 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
1397 }
1398 revs->diffopt.abbrev = revs->abbrev;
1399 if (diff_setup_done(&revs->diffopt) < 0)
1400 die("diff_setup_done failed");
1401
1402 if (revs->grep_filter) {
1403 revs->grep_filter->all_match = all_match;
1404 compile_grep_patterns(revs->grep_filter);
1405 }
1406
1407 if (revs->reverse && revs->reflog_info)
1408 die("cannot combine --reverse with --walk-reflogs");
1409
1410 /*
1411 * Limitations on the graph functionality
1412 */
1413 if (revs->reverse && revs->graph)
1414 die("cannot combine --reverse with --graph");
1415
1416 if (revs->reflog_info && revs->graph)
1417 die("cannot combine --walk-reflogs with --graph");
1418
1419 return left;
1420 }
1421
1422 int prepare_revision_walk(struct rev_info *revs)
1423 {
1424 int nr = revs->pending.nr;
1425 struct object_array_entry *e, *list;
1426
1427 e = list = revs->pending.objects;
1428 revs->pending.nr = 0;
1429 revs->pending.alloc = 0;
1430 revs->pending.objects = NULL;
1431 while (--nr >= 0) {
1432 struct commit *commit = handle_commit(revs, e->item, e->name);
1433 if (commit) {
1434 if (!(commit->object.flags & SEEN)) {
1435 commit->object.flags |= SEEN;
1436 insert_by_date(commit, &revs->commits);
1437 }
1438 }
1439 e++;
1440 }
1441 free(list);
1442
1443 if (revs->no_walk)
1444 return 0;
1445 if (revs->limited)
1446 if (limit_list(revs) < 0)
1447 return -1;
1448 if (revs->topo_order)
1449 sort_in_topological_order(&revs->commits, revs->lifo);
1450 return 0;
1451 }
1452
1453 enum rewrite_result {
1454 rewrite_one_ok,
1455 rewrite_one_noparents,
1456 rewrite_one_error,
1457 };
1458
1459 static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
1460 {
1461 for (;;) {
1462 struct commit *p = *pp;
1463 if (!revs->limited)
1464 if (add_parents_to_list(revs, p, &revs->commits) < 0)
1465 return rewrite_one_error;
1466 if (p->parents && p->parents->next)
1467 return rewrite_one_ok;
1468 if (p->object.flags & UNINTERESTING)
1469 return rewrite_one_ok;
1470 if (!(p->object.flags & TREESAME))
1471 return rewrite_one_ok;
1472 if (!p->parents)
1473 return rewrite_one_noparents;
1474 *pp = p->parents->item;
1475 }
1476 }
1477
1478 static void remove_duplicate_parents(struct commit *commit)
1479 {
1480 struct commit_list **pp, *p;
1481
1482 /* Examine existing parents while marking ones we have seen... */
1483 pp = &commit->parents;
1484 while ((p = *pp) != NULL) {
1485 struct commit *parent = p->item;
1486 if (parent->object.flags & TMP_MARK) {
1487 *pp = p->next;
1488 continue;
1489 }
1490 parent->object.flags |= TMP_MARK;
1491 pp = &p->next;
1492 }
1493 /* ... and clear the temporary mark */
1494 for (p = commit->parents; p; p = p->next)
1495 p->item->object.flags &= ~TMP_MARK;
1496 }
1497
1498 static int rewrite_parents(struct rev_info *revs, struct commit *commit)
1499 {
1500 struct commit_list **pp = &commit->parents;
1501 while (*pp) {
1502 struct commit_list *parent = *pp;
1503 switch (rewrite_one(revs, &parent->item)) {
1504 case rewrite_one_ok:
1505 break;
1506 case rewrite_one_noparents:
1507 *pp = parent->next;
1508 continue;
1509 case rewrite_one_error:
1510 return -1;
1511 }
1512 pp = &parent->next;
1513 }
1514 remove_duplicate_parents(commit);
1515 return 0;
1516 }
1517
1518 static int commit_match(struct commit *commit, struct rev_info *opt)
1519 {
1520 if (!opt->grep_filter)
1521 return 1;
1522 return grep_buffer(opt->grep_filter,
1523 NULL, /* we say nothing, not even filename */
1524 commit->buffer, strlen(commit->buffer));
1525 }
1526
1527 enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
1528 {
1529 if (commit->object.flags & SHOWN)
1530 return commit_ignore;
1531 if (revs->unpacked && has_sha1_pack(commit->object.sha1, revs->ignore_packed))
1532 return commit_ignore;
1533 if (revs->show_all)
1534 return commit_show;
1535 if (commit->object.flags & UNINTERESTING)
1536 return commit_ignore;
1537 if (revs->min_age != -1 && (commit->date > revs->min_age))
1538 return commit_ignore;
1539 if (revs->no_merges && commit->parents && commit->parents->next)
1540 return commit_ignore;
1541 if (!commit_match(commit, revs))
1542 return commit_ignore;
1543 if (revs->prune && revs->dense) {
1544 /* Commit without changes? */
1545 if (commit->object.flags & TREESAME) {
1546 /* drop merges unless we want parenthood */
1547 if (!revs->rewrite_parents)
1548 return commit_ignore;
1549 /* non-merge - always ignore it */
1550 if (!commit->parents || !commit->parents->next)
1551 return commit_ignore;
1552 }
1553 if (revs->rewrite_parents && rewrite_parents(revs, commit) < 0)
1554 return commit_error;
1555 }
1556 return commit_show;
1557 }
1558
1559 static struct commit *get_revision_1(struct rev_info *revs)
1560 {
1561 if (!revs->commits)
1562 return NULL;
1563
1564 do {
1565 struct commit_list *entry = revs->commits;
1566 struct commit *commit = entry->item;
1567
1568 revs->commits = entry->next;
1569 free(entry);
1570
1571 if (revs->reflog_info)
1572 fake_reflog_parent(revs->reflog_info, commit);
1573
1574 /*
1575 * If we haven't done the list limiting, we need to look at
1576 * the parents here. We also need to do the date-based limiting
1577 * that we'd otherwise have done in limit_list().
1578 */
1579 if (!revs->limited) {
1580 if (revs->max_age != -1 &&
1581 (commit->date < revs->max_age))
1582 continue;
1583 if (add_parents_to_list(revs, commit, &revs->commits) < 0)
1584 return NULL;
1585 }
1586
1587 switch (simplify_commit(revs, commit)) {
1588 case commit_ignore:
1589 continue;
1590 case commit_error:
1591 return NULL;
1592 default:
1593 return commit;
1594 }
1595 } while (revs->commits);
1596 return NULL;
1597 }
1598
1599 static void gc_boundary(struct object_array *array)
1600 {
1601 unsigned nr = array->nr;
1602 unsigned alloc = array->alloc;
1603 struct object_array_entry *objects = array->objects;
1604
1605 if (alloc <= nr) {
1606 unsigned i, j;
1607 for (i = j = 0; i < nr; i++) {
1608 if (objects[i].item->flags & SHOWN)
1609 continue;
1610 if (i != j)
1611 objects[j] = objects[i];
1612 j++;
1613 }
1614 for (i = j; i < nr; i++)
1615 objects[i].item = NULL;
1616 array->nr = j;
1617 }
1618 }
1619
1620 static void create_boundary_commit_list(struct rev_info *revs)
1621 {
1622 unsigned i;
1623 struct commit *c;
1624 struct object_array *array = &revs->boundary_commits;
1625 struct object_array_entry *objects = array->objects;
1626
1627 /*
1628 * If revs->commits is non-NULL at this point, an error occurred in
1629 * get_revision_1(). Ignore the error and continue printing the
1630 * boundary commits anyway. (This is what the code has always
1631 * done.)
1632 */
1633 if (revs->commits) {
1634 free_commit_list(revs->commits);
1635 revs->commits = NULL;
1636 }
1637
1638 /*
1639 * Put all of the actual boundary commits from revs->boundary_commits
1640 * into revs->commits
1641 */
1642 for (i = 0; i < array->nr; i++) {
1643 c = (struct commit *)(objects[i].item);
1644 if (!c)
1645 continue;
1646 if (!(c->object.flags & CHILD_SHOWN))
1647 continue;
1648 if (c->object.flags & (SHOWN | BOUNDARY))
1649 continue;
1650 c->object.flags |= BOUNDARY;
1651 commit_list_insert(c, &revs->commits);
1652 }
1653
1654 /*
1655 * If revs->topo_order is set, sort the boundary commits
1656 * in topological order
1657 */
1658 sort_in_topological_order(&revs->commits, revs->lifo);
1659 }
1660
1661 static struct commit *get_revision_internal(struct rev_info *revs)
1662 {
1663 struct commit *c = NULL;
1664 struct commit_list *l;
1665
1666 if (revs->boundary == 2) {
1667 /*
1668 * All of the normal commits have already been returned,
1669 * and we are now returning boundary commits.
1670 * create_boundary_commit_list() has populated
1671 * revs->commits with the remaining commits to return.
1672 */
1673 c = pop_commit(&revs->commits);
1674 if (c)
1675 c->object.flags |= SHOWN;
1676 return c;
1677 }
1678
1679 if (revs->reverse) {
1680 int limit = -1;
1681
1682 if (0 <= revs->max_count) {
1683 limit = revs->max_count;
1684 if (0 < revs->skip_count)
1685 limit += revs->skip_count;
1686 }
1687 l = NULL;
1688 while ((c = get_revision_1(revs))) {
1689 commit_list_insert(c, &l);
1690 if ((0 < limit) && !--limit)
1691 break;
1692 }
1693 revs->commits = l;
1694 revs->reverse = 0;
1695 revs->max_count = -1;
1696 c = NULL;
1697 }
1698
1699 /*
1700 * Now pick up what they want to give us
1701 */
1702 c = get_revision_1(revs);
1703 if (c) {
1704 while (0 < revs->skip_count) {
1705 revs->skip_count--;
1706 c = get_revision_1(revs);
1707 if (!c)
1708 break;
1709 }
1710 }
1711
1712 /*
1713 * Check the max_count.
1714 */
1715 switch (revs->max_count) {
1716 case -1:
1717 break;
1718 case 0:
1719 c = NULL;
1720 break;
1721 default:
1722 revs->max_count--;
1723 }
1724
1725 if (c)
1726 c->object.flags |= SHOWN;
1727
1728 if (!revs->boundary) {
1729 return c;
1730 }
1731
1732 if (!c) {
1733 /*
1734 * get_revision_1() runs out the commits, and
1735 * we are done computing the boundaries.
1736 * switch to boundary commits output mode.
1737 */
1738 revs->boundary = 2;
1739
1740 /*
1741 * Update revs->commits to contain the list of
1742 * boundary commits.
1743 */
1744 create_boundary_commit_list(revs);
1745
1746 return get_revision_internal(revs);
1747 }
1748
1749 /*
1750 * boundary commits are the commits that are parents of the
1751 * ones we got from get_revision_1() but they themselves are
1752 * not returned from get_revision_1(). Before returning
1753 * 'c', we need to mark its parents that they could be boundaries.
1754 */
1755
1756 for (l = c->parents; l; l = l->next) {
1757 struct object *p;
1758 p = &(l->item->object);
1759 if (p->flags & (CHILD_SHOWN | SHOWN))
1760 continue;
1761 p->flags |= CHILD_SHOWN;
1762 gc_boundary(&revs->boundary_commits);
1763 add_object_array(p, NULL, &revs->boundary_commits);
1764 }
1765
1766 return c;
1767 }
1768
1769 struct commit *get_revision(struct rev_info *revs)
1770 {
1771 struct commit *c = get_revision_internal(revs);
1772 if (c && revs->graph)
1773 graph_update(revs->graph, c);
1774 return c;
1775 }
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