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