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