1#include "cache.h"
2#include "tag.h"
3#include "blob.h"
4#include "tree.h"
5#include "commit.h"
6#include "diff.h"
7#include "refs.h"
8#include "revision.h"
9#include "grep.h"
10#include "reflog-walk.h"
11#include "patch-ids.h"
12static char *path_name(struct name_path *path, const char *name)
14{
15 struct name_path *p;
16 char *n, *m;
17 int nlen = strlen(name);
18 int len = nlen + 1;
19 for (p = path; p; p = p->up) {
21 if (p->elem_len)
22 len += p->elem_len + 1;
23 }
24 n = xmalloc(len);
25 m = n + len - (nlen + 1);
26 strcpy(m, name);
27 for (p = path; p; p = p->up) {
28 if (p->elem_len) {
29 m -= p->elem_len + 1;
30 memcpy(m, p->elem, p->elem_len);
31 m[p->elem_len] = '/';
32 }
33 }
34 return n;
35}
36void add_object(struct object *obj,
38 struct object_array *p,
39 struct name_path *path,
40 const char *name)
41{
42 add_object_array(obj, path_name(path, name), p);
43}
44static void mark_blob_uninteresting(struct blob *blob)
46{
47 if (blob->object.flags & UNINTERESTING)
48 return;
49 blob->object.flags |= UNINTERESTING;
50}
51void mark_tree_uninteresting(struct tree *tree)
53{
54 struct tree_desc desc;
55 struct name_entry entry;
56 struct object *obj = &tree->object;
57 if (obj->flags & UNINTERESTING)
59 return;
60 obj->flags |= UNINTERESTING;
61 if (!has_sha1_file(obj->sha1))
62 return;
63 if (parse_tree(tree) < 0)
64 die("bad tree %s", sha1_to_hex(obj->sha1));
65 init_tree_desc(&desc, tree->buffer, tree->size);
67 while (tree_entry(&desc, &entry)) {
68 if (S_ISDIR(entry.mode))
69 mark_tree_uninteresting(lookup_tree(entry.sha1));
70 else
71 mark_blob_uninteresting(lookup_blob(entry.sha1));
72 }
73 /*
75 * We don't care about the tree any more
76 * after it has been marked uninteresting.
77 */
78 free(tree->buffer);
79 tree->buffer = NULL;
80}
81void mark_parents_uninteresting(struct commit *commit)
83{
84 struct commit_list *parents = commit->parents;
85 while (parents) {
87 struct commit *commit = parents->item;
88 if (!(commit->object.flags & UNINTERESTING)) {
89 commit->object.flags |= UNINTERESTING;
90 /*
92 * Normally we haven't parsed the parent
93 * yet, so we won't have a parent of a parent
94 * here. However, it may turn out that we've
95 * reached this commit some other way (where it
96 * wasn't uninteresting), in which case we need
97 * to mark its parents recursively too..
98 */
99 if (commit->parents)
100 mark_parents_uninteresting(commit);
101 }
102 /*
104 * A missing commit is ok iff its parent is marked
105 * uninteresting.
106 *
107 * We just mark such a thing parsed, so that when
108 * it is popped next time around, we won't be trying
109 * to parse it and get an error.
110 */
111 if (!has_sha1_file(commit->object.sha1))
112 commit->object.parsed = 1;
113 parents = parents->next;
114 }
115}
116static void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode)
118{
119 if (revs->no_walk && (obj->flags & UNINTERESTING))
120 die("object ranges do not make sense when not walking revisions");
121 if (revs->reflog_info && obj->type == OBJ_COMMIT &&
122 add_reflog_for_walk(revs->reflog_info,
123 (struct commit *)obj, name))
124 return;
125 add_object_array_with_mode(obj, name, &revs->pending, mode);
126}
127void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
129{
130 add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
131}
132static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
134{
135 struct object *object;
136 object = parse_object(sha1);
138 if (!object)
139 die("bad object %s", name);
140 object->flags |= flags;
141 return object;
142}
143static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
145{
146 unsigned long flags = object->flags;
147 /*
149 * Tag object? Look what it points to..
150 */
151 while (object->type == OBJ_TAG) {
152 struct tag *tag = (struct tag *) object;
153 if (revs->tag_objects && !(flags & UNINTERESTING))
154 add_pending_object(revs, object, tag->tag);
155 object = parse_object(tag->tagged->sha1);
156 if (!object)
157 die("bad object %s", sha1_to_hex(tag->tagged->sha1));
158 }
159 /*
161 * Commit object? Just return it, we'll do all the complex
162 * reachability crud.
163 */
164 if (object->type == OBJ_COMMIT) {
165 struct commit *commit = (struct commit *)object;
166 if (parse_commit(commit) < 0)
167 die("unable to parse commit %s", name);
168 if (flags & UNINTERESTING) {
169 commit->object.flags |= UNINTERESTING;
170 mark_parents_uninteresting(commit);
171 revs->limited = 1;
172 }
173 return commit;
174 }
175 /*
177 * Tree object? Either mark it uniniteresting, or add it
178 * to the list of objects to look at later..
179 */
180 if (object->type == OBJ_TREE) {
181 struct tree *tree = (struct tree *)object;
182 if (!revs->tree_objects)
183 return NULL;
184 if (flags & UNINTERESTING) {
185 mark_tree_uninteresting(tree);
186 return NULL;
187 }
188 add_pending_object(revs, object, "");
189 return NULL;
190 }
191 /*
193 * Blob object? You know the drill by now..
194 */
195 if (object->type == OBJ_BLOB) {
196 struct blob *blob = (struct blob *)object;
197 if (!revs->blob_objects)
198 return NULL;
199 if (flags & UNINTERESTING) {
200 mark_blob_uninteresting(blob);
201 return NULL;
202 }
203 add_pending_object(revs, object, "");
204 return NULL;
205 }
206 die("%s is unknown object", name);
207}
208static int everybody_uninteresting(struct commit_list *orig)
210{
211 struct commit_list *list = orig;
212 while (list) {
213 struct commit *commit = list->item;
214 list = list->next;
215 if (commit->object.flags & UNINTERESTING)
216 continue;
217 return 0;
218 }
219 return 1;
220}
221/*
223 * The goal is to get REV_TREE_NEW as the result only if the
224 * diff consists of all '+' (and no other changes), and
225 * REV_TREE_DIFFERENT otherwise (of course if the trees are
226 * the same we want REV_TREE_SAME). That means that once we
227 * get to REV_TREE_DIFFERENT, we do not have to look any further.
228 */
229static int tree_difference = REV_TREE_SAME;
230static void file_add_remove(struct diff_options *options,
232 int addremove, unsigned mode,
233 const unsigned char *sha1,
234 const char *base, const char *path)
235{
236 int diff = REV_TREE_DIFFERENT;
237 /*
239 * Is it an add of a new file? It means that the old tree
240 * didn't have it at all, so we will turn "REV_TREE_SAME" ->
241 * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
242 * (and if it already was "REV_TREE_NEW", we'll keep it
243 * "REV_TREE_NEW" of course).
244 */
245 if (addremove == '+') {
246 diff = tree_difference;
247 if (diff != REV_TREE_SAME)
248 return;
249 diff = REV_TREE_NEW;
250 }
251 tree_difference = diff;
252 if (tree_difference == REV_TREE_DIFFERENT)
253 options->has_changes = 1;
254}
255static void file_change(struct diff_options *options,
257 unsigned old_mode, unsigned new_mode,
258 const unsigned char *old_sha1,
259 const unsigned char *new_sha1,
260 const char *base, const char *path)
261{
262 tree_difference = REV_TREE_DIFFERENT;
263 options->has_changes = 1;
264}
265static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
267{
268 if (!t1)
269 return REV_TREE_NEW;
270 if (!t2)
271 return REV_TREE_DIFFERENT;
272 tree_difference = REV_TREE_SAME;
273 revs->pruning.has_changes = 0;
274 if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
275 &revs->pruning) < 0)
276 return REV_TREE_DIFFERENT;
277 return tree_difference;
278}
279static int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
281{
282 int retval;
283 void *tree;
284 unsigned long size;
285 struct tree_desc empty, real;
286 if (!t1)
288 return 0;
289 tree = read_object_with_reference(t1->object.sha1, tree_type, &size, NULL);
291 if (!tree)
292 return 0;
293 init_tree_desc(&real, tree, size);
294 init_tree_desc(&empty, "", 0);
295 tree_difference = REV_TREE_SAME;
297 revs->pruning.has_changes = 0;
298 retval = diff_tree(&empty, &real, "", &revs->pruning);
299 free(tree);
300 return retval >= 0 && (tree_difference == REV_TREE_SAME);
302}
303static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
305{
306 struct commit_list **pp, *parent;
307 int tree_changed = 0, tree_same = 0;
308 if (!commit->tree)
310 return;
311 if (!commit->parents) {
313 if (!rev_same_tree_as_empty(revs, commit->tree))
314 commit->object.flags |= TREECHANGE;
315 return;
316 }
317 pp = &commit->parents;
319 while ((parent = *pp) != NULL) {
320 struct commit *p = parent->item;
321 if (parse_commit(p) < 0)
323 die("cannot simplify commit %s (because of %s)",
324 sha1_to_hex(commit->object.sha1),
325 sha1_to_hex(p->object.sha1));
326 switch (rev_compare_tree(revs, p->tree, commit->tree)) {
327 case REV_TREE_SAME:
328 tree_same = 1;
329 if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
330 /* Even if a merge with an uninteresting
331 * side branch brought the entire change
332 * we are interested in, we do not want
333 * to lose the other branches of this
334 * merge, so we just keep going.
335 */
336 pp = &parent->next;
337 continue;
338 }
339 parent->next = NULL;
340 commit->parents = parent;
341 return;
342 case REV_TREE_NEW:
344 if (revs->remove_empty_trees &&
345 rev_same_tree_as_empty(revs, p->tree)) {
346 /* We are adding all the specified
347 * paths from this parent, so the
348 * history beyond this parent is not
349 * interesting. Remove its parents
350 * (they are grandparents for us).
351 * IOW, we pretend this parent is a
352 * "root" commit.
353 */
354 if (parse_commit(p) < 0)
355 die("cannot simplify commit %s (invalid %s)",
356 sha1_to_hex(commit->object.sha1),
357 sha1_to_hex(p->object.sha1));
358 p->parents = NULL;
359 }
360 /* fallthrough */
361 case REV_TREE_DIFFERENT:
362 tree_changed = 1;
363 pp = &parent->next;
364 continue;
365 }
366 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
367 }
368 if (tree_changed && !tree_same)
369 commit->object.flags |= TREECHANGE;
370}
371static int add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
373{
374 struct commit_list *parent = commit->parents;
375 unsigned left_flag;
376 int add, rest;
377 if (commit->object.flags & ADDED)
379 return 0;
380 commit->object.flags |= ADDED;
381 /*
383 * If the commit is uninteresting, don't try to
384 * prune parents - we want the maximal uninteresting
385 * set.
386 *
387 * Normally we haven't parsed the parent
388 * yet, so we won't have a parent of a parent
389 * here. However, it may turn out that we've
390 * reached this commit some other way (where it
391 * wasn't uninteresting), in which case we need
392 * to mark its parents recursively too..
393 */
394 if (commit->object.flags & UNINTERESTING) {
395 while (parent) {
396 struct commit *p = parent->item;
397 parent = parent->next;
398 if (parse_commit(p) < 0)
399 return -1;
400 p->object.flags |= UNINTERESTING;
401 if (p->parents)
402 mark_parents_uninteresting(p);
403 if (p->object.flags & SEEN)
404 continue;
405 p->object.flags |= SEEN;
406 insert_by_date(p, list);
407 }
408 return 0;
409 }
410 /*
412 * Ok, the commit wasn't uninteresting. Try to
413 * simplify the commit history and find the parent
414 * that has no differences in the path set if one exists.
415 */
416 if (revs->prune_fn)
417 revs->prune_fn(revs, commit);
418 if (revs->no_walk)
420 return 0;
421 left_flag = (commit->object.flags & SYMMETRIC_LEFT);
423 rest = !revs->first_parent_only;
425 for (parent = commit->parents, add = 1; parent; add = rest) {
426 struct commit *p = parent->item;
427 parent = parent->next;
429 if (parse_commit(p) < 0)
430 return -1;
431 p->object.flags |= left_flag;
432 if (p->object.flags & SEEN)
433 continue;
434 p->object.flags |= SEEN;
435 if (add)
436 insert_by_date(p, list);
437 }
438 return 0;
439}
440static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
442{
443 struct commit_list *p;
444 int left_count = 0, right_count = 0;
445 int left_first;
446 struct patch_ids ids;
447 /* First count the commits on the left and on the right */
449 for (p = list; p; p = p->next) {
450 struct commit *commit = p->item;
451 unsigned flags = commit->object.flags;
452 if (flags & BOUNDARY)
453 ;
454 else if (flags & SYMMETRIC_LEFT)
455 left_count++;
456 else
457 right_count++;
458 }
459 left_first = left_count < right_count;
461 init_patch_ids(&ids);
462 if (revs->diffopt.nr_paths) {
463 ids.diffopts.nr_paths = revs->diffopt.nr_paths;
464 ids.diffopts.paths = revs->diffopt.paths;
465 ids.diffopts.pathlens = revs->diffopt.pathlens;
466 }
467 /* Compute patch-ids for one side */
469 for (p = list; p; p = p->next) {
470 struct commit *commit = p->item;
471 unsigned flags = commit->object.flags;
472 if (flags & BOUNDARY)
474 continue;
475 /*
476 * If we have fewer left, left_first is set and we omit
477 * commits on the right branch in this loop. If we have
478 * fewer right, we skip the left ones.
479 */
480 if (left_first != !!(flags & SYMMETRIC_LEFT))
481 continue;
482 commit->util = add_commit_patch_id(commit, &ids);
483 }
484 /* Check the other side */
486 for (p = list; p; p = p->next) {
487 struct commit *commit = p->item;
488 struct patch_id *id;
489 unsigned flags = commit->object.flags;
490 if (flags & BOUNDARY)
492 continue;
493 /*
494 * If we have fewer left, left_first is set and we omit
495 * commits on the left branch in this loop.
496 */
497 if (left_first == !!(flags & SYMMETRIC_LEFT))
498 continue;
499 /*
501 * Have we seen the same patch id?
502 */
503 id = has_commit_patch_id(commit, &ids);
504 if (!id)
505 continue;
506 id->seen = 1;
507 commit->object.flags |= SHOWN;
508 }
509 /* Now check the original side for seen ones */
511 for (p = list; p; p = p->next) {
512 struct commit *commit = p->item;
513 struct patch_id *ent;
514 ent = commit->util;
516 if (!ent)
517 continue;
518 if (ent->seen)
519 commit->object.flags |= SHOWN;
520 commit->util = NULL;
521 }
522 free_patch_ids(&ids);
524}
525static int limit_list(struct rev_info *revs)
527{
528 struct commit_list *list = revs->commits;
529 struct commit_list *newlist = NULL;
530 struct commit_list **p = &newlist;
531 while (list) {
533 struct commit_list *entry = list;
534 struct commit *commit = list->item;
535 struct object *obj = &commit->object;
536 list = list->next;
538 free(entry);
539 if (revs->max_age != -1 && (commit->date < revs->max_age))
541 obj->flags |= UNINTERESTING;
542 if (add_parents_to_list(revs, commit, &list) < 0)
543 return -1;
544 if (obj->flags & UNINTERESTING) {
545 mark_parents_uninteresting(commit);
546 if (everybody_uninteresting(list))
547 break;
548 continue;
549 }
550 if (revs->min_age != -1 && (commit->date > revs->min_age))
551 continue;
552 p = &commit_list_insert(commit, p)->next;
553 }
554 if (revs->cherry_pick)
555 cherry_pick_list(newlist, revs);
556 revs->commits = newlist;
558 return 0;
559}
560struct all_refs_cb {
562 int all_flags;
563 int warned_bad_reflog;
564 struct rev_info *all_revs;
565 const char *name_for_errormsg;
566};
567static int handle_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
569{
570 struct all_refs_cb *cb = cb_data;
571 struct object *object = get_reference(cb->all_revs, path, sha1,
572 cb->all_flags);
573 add_pending_object(cb->all_revs, object, path);
574 return 0;
575}
576static void handle_all(struct rev_info *revs, unsigned flags)
578{
579 struct all_refs_cb cb;
580 cb.all_revs = revs;
581 cb.all_flags = flags;
582 for_each_ref(handle_one_ref, &cb);
583}
584static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
586{
587 struct all_refs_cb *cb = cb_data;
588 if (!is_null_sha1(sha1)) {
589 struct object *o = parse_object(sha1);
590 if (o) {
591 o->flags |= cb->all_flags;
592 add_pending_object(cb->all_revs, o, "");
593 }
594 else if (!cb->warned_bad_reflog) {
595 warning("reflog of '%s' references pruned commits",
596 cb->name_for_errormsg);
597 cb->warned_bad_reflog = 1;
598 }
599 }
600}
601static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
603 const char *email, unsigned long timestamp, int tz,
604 const char *message, void *cb_data)
605{
606 handle_one_reflog_commit(osha1, cb_data);
607 handle_one_reflog_commit(nsha1, cb_data);
608 return 0;
609}
610static int handle_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
612{
613 struct all_refs_cb *cb = cb_data;
614 cb->warned_bad_reflog = 0;
615 cb->name_for_errormsg = path;
616 for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
617 return 0;
618}
619static void handle_reflog(struct rev_info *revs, unsigned flags)
621{
622 struct all_refs_cb cb;
623 cb.all_revs = revs;
624 cb.all_flags = flags;
625 for_each_reflog(handle_one_reflog, &cb);
626}
627static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
629{
630 unsigned char sha1[20];
631 struct object *it;
632 struct commit *commit;
633 struct commit_list *parents;
634 if (*arg == '^') {
636 flags ^= UNINTERESTING;
637 arg++;
638 }
639 if (get_sha1(arg, sha1))
640 return 0;
641 while (1) {
642 it = get_reference(revs, arg, sha1, 0);
643 if (it->type != OBJ_TAG)
644 break;
645 hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
646 }
647 if (it->type != OBJ_COMMIT)
648 return 0;
649 commit = (struct commit *)it;
650 for (parents = commit->parents; parents; parents = parents->next) {
651 it = &parents->item->object;
652 it->flags |= flags;
653 add_pending_object(revs, it, arg);
654 }
655 return 1;
656}
657void init_revisions(struct rev_info *revs, const char *prefix)
659{
660 memset(revs, 0, sizeof(*revs));
661 revs->abbrev = DEFAULT_ABBREV;
663 revs->ignore_merges = 1;
664 revs->simplify_history = 1;
665 revs->pruning.recursive = 1;
666 revs->pruning.quiet = 1;
667 revs->pruning.add_remove = file_add_remove;
668 revs->pruning.change = file_change;
669 revs->lifo = 1;
670 revs->dense = 1;
671 revs->prefix = prefix;
672 revs->max_age = -1;
673 revs->min_age = -1;
674 revs->skip_count = -1;
675 revs->max_count = -1;
676 revs->prune_fn = NULL;
678 revs->prune_data = NULL;
679 revs->topo_setter = topo_sort_default_setter;
681 revs->topo_getter = topo_sort_default_getter;
682 revs->commit_format = CMIT_FMT_DEFAULT;
684 diff_setup(&revs->diffopt);
686}
687static void add_pending_commit_list(struct rev_info *revs,
689 struct commit_list *commit_list,
690 unsigned int flags)
691{
692 while (commit_list) {
693 struct object *object = &commit_list->item->object;
694 object->flags |= flags;
695 add_pending_object(revs, object, sha1_to_hex(object->sha1));
696 commit_list = commit_list->next;
697 }
698}
699static void prepare_show_merge(struct rev_info *revs)
701{
702 struct commit_list *bases;
703 struct commit *head, *other;
704 unsigned char sha1[20];
705 const char **prune = NULL;
706 int i, prune_num = 1; /* counting terminating NULL */
707 if (get_sha1("HEAD", sha1) || !(head = lookup_commit(sha1)))
709 die("--merge without HEAD?");
710 if (get_sha1("MERGE_HEAD", sha1) || !(other = lookup_commit(sha1)))
711 die("--merge without MERGE_HEAD?");
712 add_pending_object(revs, &head->object, "HEAD");
713 add_pending_object(revs, &other->object, "MERGE_HEAD");
714 bases = get_merge_bases(head, other, 1);
715 while (bases) {
716 struct commit *it = bases->item;
717 struct commit_list *n = bases->next;
718 free(bases);
719 bases = n;
720 it->object.flags |= UNINTERESTING;
721 add_pending_object(revs, &it->object, "(merge-base)");
722 }
723 if (!active_nr)
725 read_cache();
726 for (i = 0; i < active_nr; i++) {
727 struct cache_entry *ce = active_cache[i];
728 if (!ce_stage(ce))
729 continue;
730 if (ce_path_match(ce, revs->prune_data)) {
731 prune_num++;
732 prune = xrealloc(prune, sizeof(*prune) * prune_num);
733 prune[prune_num-2] = ce->name;
734 prune[prune_num-1] = NULL;
735 }
736 while ((i+1 < active_nr) &&
737 ce_same_name(ce, active_cache[i+1]))
738 i++;
739 }
740 revs->prune_data = prune;
741}
742int handle_revision_arg(const char *arg, struct rev_info *revs,
744 int flags,
745 int cant_be_filename)
746{
747 unsigned mode;
748 char *dotdot;
749 struct object *object;
750 unsigned char sha1[20];
751 int local_flags;
752 dotdot = strstr(arg, "..");
754 if (dotdot) {
755 unsigned char from_sha1[20];
756 const char *next = dotdot + 2;
757 const char *this = arg;
758 int symmetric = *next == '.';
759 unsigned int flags_exclude = flags ^ UNINTERESTING;
760 *dotdot = 0;
762 next += symmetric;
763 if (!*next)
765 next = "HEAD";
766 if (dotdot == arg)
767 this = "HEAD";
768 if (!get_sha1(this, from_sha1) &&
769 !get_sha1(next, sha1)) {
770 struct commit *a, *b;
771 struct commit_list *exclude;
772 a = lookup_commit_reference(from_sha1);
774 b = lookup_commit_reference(sha1);
775 if (!a || !b) {
776 die(symmetric ?
777 "Invalid symmetric difference expression %s...%s" :
778 "Invalid revision range %s..%s",
779 arg, next);
780 }
781 if (!cant_be_filename) {
783 *dotdot = '.';
784 verify_non_filename(revs->prefix, arg);
785 }
786 if (symmetric) {
788 exclude = get_merge_bases(a, b, 1);
789 add_pending_commit_list(revs, exclude,
790 flags_exclude);
791 free_commit_list(exclude);
792 a->object.flags |= flags | SYMMETRIC_LEFT;
793 } else
794 a->object.flags |= flags_exclude;
795 b->object.flags |= flags;
796 add_pending_object(revs, &a->object, this);
797 add_pending_object(revs, &b->object, next);
798 return 0;
799 }
800 *dotdot = '.';
801 }
802 dotdot = strstr(arg, "^@");
803 if (dotdot && !dotdot[2]) {
804 *dotdot = 0;
805 if (add_parents_only(revs, arg, flags))
806 return 0;
807 *dotdot = '^';
808 }
809 dotdot = strstr(arg, "^!");
810 if (dotdot && !dotdot[2]) {
811 *dotdot = 0;
812 if (!add_parents_only(revs, arg, flags ^ UNINTERESTING))
813 *dotdot = '^';
814 }
815 local_flags = 0;
817 if (*arg == '^') {
818 local_flags = UNINTERESTING;
819 arg++;
820 }
821 if (get_sha1_with_mode(arg, sha1, &mode))
822 return -1;
823 if (!cant_be_filename)
824 verify_non_filename(revs->prefix, arg);
825 object = get_reference(revs, arg, sha1, flags ^ local_flags);
826 add_pending_object_with_mode(revs, object, arg, mode);
827 return 0;
828}
829static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
831{
832 if (!revs->grep_filter) {
833 struct grep_opt *opt = xcalloc(1, sizeof(*opt));
834 opt->status_only = 1;
835 opt->pattern_tail = &(opt->pattern_list);
836 opt->regflags = REG_NEWLINE;
837 revs->grep_filter = opt;
838 }
839 append_grep_pattern(revs->grep_filter, ptn,
840 "command line", 0, what);
841}
842static void add_header_grep(struct rev_info *revs, const char *field, const char *pattern)
844{
845 char *pat;
846 const char *prefix;
847 int patlen, fldlen;
848 fldlen = strlen(field);
850 patlen = strlen(pattern);
851 pat = xmalloc(patlen + fldlen + 10);
852 prefix = ".*";
853 if (*pattern == '^') {
854 prefix = "";
855 pattern++;
856 }
857 sprintf(pat, "^%s %s%s", field, prefix, pattern);
858 add_grep(revs, pat, GREP_PATTERN_HEAD);
859}
860static void add_message_grep(struct rev_info *revs, const char *pattern)
862{
863 add_grep(revs, pattern, GREP_PATTERN_BODY);
864}
865static void add_ignore_packed(struct rev_info *revs, const char *name)
867{
868 int num = ++revs->num_ignore_packed;
869 revs->ignore_packed = xrealloc(revs->ignore_packed,
871 sizeof(const char **) * (num + 1));
872 revs->ignore_packed[num-1] = name;
873 revs->ignore_packed[num] = NULL;
874}
875/*
877 * Parse revision information, filling in the "rev_info" structure,
878 * and removing the used arguments from the argument list.
879 *
880 * Returns the number of arguments left that weren't recognized
881 * (which are also moved to the head of the argument list)
882 */
883int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
884{
885 int i, flags, seen_dashdash, show_merge;
886 const char **unrecognized = argv + 1;
887 int left = 1;
888 int all_match = 0;
889 int regflags = 0;
890 /* First, search for "--" */
892 seen_dashdash = 0;
893 for (i = 1; i < argc; i++) {
894 const char *arg = argv[i];
895 if (strcmp(arg, "--"))
896 continue;
897 argv[i] = NULL;
898 argc = i;
899 if (argv[i + 1])
900 revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
901 seen_dashdash = 1;
902 break;
903 }
904 flags = show_merge = 0;
906 for (i = 1; i < argc; i++) {
907 const char *arg = argv[i];
908 if (*arg == '-') {
909 int opts;
910 if (!prefixcmp(arg, "--max-count=")) {
911 revs->max_count = atoi(arg + 12);
912 continue;
913 }
914 if (!prefixcmp(arg, "--skip=")) {
915 revs->skip_count = atoi(arg + 7);
916 continue;
917 }
918 /* accept -<digit>, like traditional "head" */
919 if ((*arg == '-') && isdigit(arg[1])) {
920 revs->max_count = atoi(arg + 1);
921 continue;
922 }
923 if (!strcmp(arg, "-n")) {
924 if (argc <= i + 1)
925 die("-n requires an argument");
926 revs->max_count = atoi(argv[++i]);
927 continue;
928 }
929 if (!prefixcmp(arg, "-n")) {
930 revs->max_count = atoi(arg + 2);
931 continue;
932 }
933 if (!prefixcmp(arg, "--max-age=")) {
934 revs->max_age = atoi(arg + 10);
935 continue;
936 }
937 if (!prefixcmp(arg, "--since=")) {
938 revs->max_age = approxidate(arg + 8);
939 continue;
940 }
941 if (!prefixcmp(arg, "--after=")) {
942 revs->max_age = approxidate(arg + 8);
943 continue;
944 }
945 if (!prefixcmp(arg, "--min-age=")) {
946 revs->min_age = atoi(arg + 10);
947 continue;
948 }
949 if (!prefixcmp(arg, "--before=")) {
950 revs->min_age = approxidate(arg + 9);
951 continue;
952 }
953 if (!prefixcmp(arg, "--until=")) {
954 revs->min_age = approxidate(arg + 8);
955 continue;
956 }
957 if (!strcmp(arg, "--all")) {
958 handle_all(revs, flags);
959 continue;
960 }
961 if (!strcmp(arg, "--first-parent")) {
962 revs->first_parent_only = 1;
963 continue;
964 }
965 if (!strcmp(arg, "--reflog")) {
966 handle_reflog(revs, flags);
967 continue;
968 }
969 if (!strcmp(arg, "-g") ||
970 !strcmp(arg, "--walk-reflogs")) {
971 init_reflog_walk(&revs->reflog_info);
972 continue;
973 }
974 if (!strcmp(arg, "--not")) {
975 flags ^= UNINTERESTING;
976 continue;
977 }
978 if (!strcmp(arg, "--default")) {
979 if (++i >= argc)
980 die("bad --default argument");
981 def = argv[i];
982 continue;
983 }
984 if (!strcmp(arg, "--merge")) {
985 show_merge = 1;
986 continue;
987 }
988 if (!strcmp(arg, "--topo-order")) {
989 revs->topo_order = 1;
990 continue;
991 }
992 if (!strcmp(arg, "--date-order")) {
993 revs->lifo = 0;
994 revs->topo_order = 1;
995 continue;
996 }
997 if (!strcmp(arg, "--parents")) {
998 revs->parents = 1;
999 continue;
1000 }
1001 if (!strcmp(arg, "--dense")) {
1002 revs->dense = 1;
1003 continue;
1004 }
1005 if (!strcmp(arg, "--sparse")) {
1006 revs->dense = 0;
1007 continue;
1008 }
1009 if (!strcmp(arg, "--remove-empty")) {
1010 revs->remove_empty_trees = 1;
1011 continue;
1012 }
1013 if (!strcmp(arg, "--no-merges")) {
1014 revs->no_merges = 1;
1015 continue;
1016 }
1017 if (!strcmp(arg, "--boundary")) {
1018 revs->boundary = 1;
1019 continue;
1020 }
1021 if (!strcmp(arg, "--left-right")) {
1022 revs->left_right = 1;
1023 continue;
1024 }
1025 if (!strcmp(arg, "--cherry-pick")) {
1026 revs->cherry_pick = 1;
1027 continue;
1028 }
1029 if (!strcmp(arg, "--objects")) {
1030 revs->tag_objects = 1;
1031 revs->tree_objects = 1;
1032 revs->blob_objects = 1;
1033 continue;
1034 }
1035 if (!strcmp(arg, "--objects-edge")) {
1036 revs->tag_objects = 1;
1037 revs->tree_objects = 1;
1038 revs->blob_objects = 1;
1039 revs->edge_hint = 1;
1040 continue;
1041 }
1042 if (!strcmp(arg, "--unpacked")) {
1043 revs->unpacked = 1;
1044 free(revs->ignore_packed);
1045 revs->ignore_packed = NULL;
1046 revs->num_ignore_packed = 0;
1047 continue;
1048 }
1049 if (!prefixcmp(arg, "--unpacked=")) {
1050 revs->unpacked = 1;
1051 add_ignore_packed(revs, arg+11);
1052 continue;
1053 }
1054 if (!strcmp(arg, "-r")) {
1055 revs->diff = 1;
1056 revs->diffopt.recursive = 1;
1057 continue;
1058 }
1059 if (!strcmp(arg, "-t")) {
1060 revs->diff = 1;
1061 revs->diffopt.recursive = 1;
1062 revs->diffopt.tree_in_recursive = 1;
1063 continue;
1064 }
1065 if (!strcmp(arg, "-m")) {
1066 revs->ignore_merges = 0;
1067 continue;
1068 }
1069 if (!strcmp(arg, "-c")) {
1070 revs->diff = 1;
1071 revs->dense_combined_merges = 0;
1072 revs->combine_merges = 1;
1073 continue;
1074 }
1075 if (!strcmp(arg, "--cc")) {
1076 revs->diff = 1;
1077 revs->dense_combined_merges = 1;
1078 revs->combine_merges = 1;
1079 continue;
1080 }
1081 if (!strcmp(arg, "-v")) {
1082 revs->verbose_header = 1;
1083 continue;
1084 }
1085 if (!prefixcmp(arg, "--pretty")) {
1086 revs->verbose_header = 1;
1087 revs->commit_format = get_commit_format(arg+8);
1088 continue;
1089 }
1090 if (!strcmp(arg, "--root")) {
1091 revs->show_root_diff = 1;
1092 continue;
1093 }
1094 if (!strcmp(arg, "--no-commit-id")) {
1095 revs->no_commit_id = 1;
1096 continue;
1097 }
1098 if (!strcmp(arg, "--always")) {
1099 revs->always_show_header = 1;
1100 continue;
1101 }
1102 if (!strcmp(arg, "--no-abbrev")) {
1103 revs->abbrev = 0;
1104 continue;
1105 }
1106 if (!strcmp(arg, "--abbrev")) {
1107 revs->abbrev = DEFAULT_ABBREV;
1108 continue;
1109 }
1110 if (!prefixcmp(arg, "--abbrev=")) {
1111 revs->abbrev = strtoul(arg + 9, NULL, 10);
1112 if (revs->abbrev < MINIMUM_ABBREV)
1113 revs->abbrev = MINIMUM_ABBREV;
1114 else if (revs->abbrev > 40)
1115 revs->abbrev = 40;
1116 continue;
1117 }
1118 if (!strcmp(arg, "--abbrev-commit")) {
1119 revs->abbrev_commit = 1;
1120 continue;
1121 }
1122 if (!strcmp(arg, "--full-diff")) {
1123 revs->diff = 1;
1124 revs->full_diff = 1;
1125 continue;
1126 }
1127 if (!strcmp(arg, "--full-history")) {
1128 revs->simplify_history = 0;
1129 continue;
1130 }
1131 if (!strcmp(arg, "--relative-date")) {
1132 revs->date_mode = DATE_RELATIVE;
1133 continue;
1134 }
1135 if (!strncmp(arg, "--date=", 7)) {
1136 if (!strcmp(arg + 7, "relative"))
1137 revs->date_mode = DATE_RELATIVE;
1138 else if (!strcmp(arg + 7, "iso8601") ||
1139 !strcmp(arg + 7, "iso"))
1140 revs->date_mode = DATE_ISO8601;
1141 else if (!strcmp(arg + 7, "rfc2822") ||
1142 !strcmp(arg + 7, "rfc"))
1143 revs->date_mode = DATE_RFC2822;
1144 else if (!strcmp(arg + 7, "short"))
1145 revs->date_mode = DATE_SHORT;
1146 else if (!strcmp(arg + 7, "local"))
1147 revs->date_mode = DATE_LOCAL;
1148 else if (!strcmp(arg + 7, "default"))
1149 revs->date_mode = DATE_NORMAL;
1150 else
1151 die("unknown date format %s", arg);
1152 continue;
1153 }
1154 if (!strcmp(arg, "--log-size")) {
1155 revs->show_log_size = 1;
1156 continue;
1157 }
1158 /*
1160 * Grepping the commit log
1161 */
1162 if (!prefixcmp(arg, "--author=")) {
1163 add_header_grep(revs, "author", arg+9);
1164 continue;
1165 }
1166 if (!prefixcmp(arg, "--committer=")) {
1167 add_header_grep(revs, "committer", arg+12);
1168 continue;
1169 }
1170 if (!prefixcmp(arg, "--grep=")) {
1171 add_message_grep(revs, arg+7);
1172 continue;
1173 }
1174 if (!strcmp(arg, "--extended-regexp") ||
1175 !strcmp(arg, "-E")) {
1176 regflags |= REG_EXTENDED;
1177 continue;
1178 }
1179 if (!strcmp(arg, "--regexp-ignore-case") ||
1180 !strcmp(arg, "-i")) {
1181 regflags |= REG_ICASE;
1182 continue;
1183 }
1184 if (!strcmp(arg, "--all-match")) {
1185 all_match = 1;
1186 continue;
1187 }
1188 if (!prefixcmp(arg, "--encoding=")) {
1189 arg += 11;
1190 if (strcmp(arg, "none"))
1191 git_log_output_encoding = xstrdup(arg);
1192 else
1193 git_log_output_encoding = "";
1194 continue;
1195 }
1196 if (!strcmp(arg, "--reverse")) {
1197 revs->reverse ^= 1;
1198 continue;
1199 }
1200 if (!strcmp(arg, "--no-walk")) {
1201 revs->no_walk = 1;
1202 continue;
1203 }
1204 if (!strcmp(arg, "--do-walk")) {
1205 revs->no_walk = 0;
1206 continue;
1207 }
1208 opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
1210 if (opts > 0) {
1211 if (strcmp(argv[i], "-z"))
1212 revs->diff = 1;
1213 i += opts - 1;
1214 continue;
1215 }
1216 *unrecognized++ = arg;
1217 left++;
1218 continue;
1219 }
1220 if (handle_revision_arg(arg, revs, flags, seen_dashdash)) {
1222 int j;
1223 if (seen_dashdash || *arg == '^')
1224 die("bad revision '%s'", arg);
1225 /* If we didn't have a "--":
1227 * (1) all filenames must exist;
1228 * (2) all rev-args must not be interpretable
1229 * as a valid filename.
1230 * but the latter we have checked in the main loop.
1231 */
1232 for (j = i; j < argc; j++)
1233 verify_filename(revs->prefix, argv[j]);
1234 revs->prune_data = get_pathspec(revs->prefix,
1236 argv + i);
1237 break;
1238 }
1239 }
1240 if (revs->grep_filter)
1242 revs->grep_filter->regflags |= regflags;
1243 if (show_merge)
1245 prepare_show_merge(revs);
1246 if (def && !revs->pending.nr) {
1247 unsigned char sha1[20];
1248 struct object *object;
1249 unsigned mode;
1250 if (get_sha1_with_mode(def, sha1, &mode))
1251 die("bad default revision '%s'", def);
1252 object = get_reference(revs, def, sha1, 0);
1253 add_pending_object_with_mode(revs, object, def, mode);
1254 }
1255 if (revs->topo_order)
1257 revs->limited = 1;
1258 if (revs->prune_data) {
1260 diff_tree_setup_paths(revs->prune_data, &revs->pruning);
1261 /* Can't prune commits with rename following: the paths change.. */
1262 if (!revs->diffopt.follow_renames)
1263 revs->prune_fn = try_to_simplify_commit;
1264 if (!revs->full_diff)
1265 diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
1266 }
1267 if (revs->combine_merges) {
1268 revs->ignore_merges = 0;
1269 if (revs->dense_combined_merges && !revs->diffopt.output_format)
1270 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
1271 }
1272 revs->diffopt.abbrev = revs->abbrev;
1273 if (diff_setup_done(&revs->diffopt) < 0)
1274 die("diff_setup_done failed");
1275 if (revs->grep_filter) {
1277 revs->grep_filter->all_match = all_match;
1278 compile_grep_patterns(revs->grep_filter);
1279 }
1280 if (revs->reverse && revs->reflog_info)
1282 die("cannot combine --reverse with --walk-reflogs");
1283 return left;
1285}
1286int prepare_revision_walk(struct rev_info *revs)
1288{
1289 int nr = revs->pending.nr;
1290 struct object_array_entry *e, *list;
1291 e = list = revs->pending.objects;
1293 revs->pending.nr = 0;
1294 revs->pending.alloc = 0;
1295 revs->pending.objects = NULL;
1296 while (--nr >= 0) {
1297 struct commit *commit = handle_commit(revs, e->item, e->name);
1298 if (commit) {
1299 if (!(commit->object.flags & SEEN)) {
1300 commit->object.flags |= SEEN;
1301 insert_by_date(commit, &revs->commits);
1302 }
1303 }
1304 e++;
1305 }
1306 free(list);
1307 if (revs->no_walk)
1309 return 0;
1310 if (revs->limited)
1311 if (limit_list(revs) < 0)
1312 return -1;
1313 if (revs->topo_order)
1314 sort_in_topological_order_fn(&revs->commits, revs->lifo,
1315 revs->topo_setter,
1316 revs->topo_getter);
1317 return 0;
1318}
1319enum rewrite_result {
1321 rewrite_one_ok,
1322 rewrite_one_noparents,
1323 rewrite_one_error,
1324};
1325static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
1327{
1328 for (;;) {
1329 struct commit *p = *pp;
1330 if (!revs->limited)
1331 if (add_parents_to_list(revs, p, &revs->commits) < 0)
1332 return rewrite_one_error;
1333 if (p->parents && p->parents->next)
1334 return rewrite_one_ok;
1335 if (p->object.flags & (TREECHANGE | UNINTERESTING))
1336 return rewrite_one_ok;
1337 if (!p->parents)
1338 return rewrite_one_noparents;
1339 *pp = p->parents->item;
1340 }
1341}
1342static void remove_duplicate_parents(struct commit *commit)
1344{
1345 struct commit_list **pp, *p;
1346 /* Examine existing parents while marking ones we have seen... */
1348 pp = &commit->parents;
1349 while ((p = *pp) != NULL) {
1350 struct commit *parent = p->item;
1351 if (parent->object.flags & TMP_MARK) {
1352 *pp = p->next;
1353 continue;
1354 }
1355 parent->object.flags |= TMP_MARK;
1356 pp = &p->next;
1357 }
1358 /* ... and clear the temporary mark */
1359 for (p = commit->parents; p; p = p->next)
1360 p->item->object.flags &= ~TMP_MARK;
1361}
1362static int rewrite_parents(struct rev_info *revs, struct commit *commit)
1364{
1365 struct commit_list **pp = &commit->parents;
1366 while (*pp) {
1367 struct commit_list *parent = *pp;
1368 switch (rewrite_one(revs, &parent->item)) {
1369 case rewrite_one_ok:
1370 break;
1371 case rewrite_one_noparents:
1372 *pp = parent->next;
1373 continue;
1374 case rewrite_one_error:
1375 return -1;
1376 }
1377 pp = &parent->next;
1378 }
1379 remove_duplicate_parents(commit);
1380 return 0;
1381}
1382static int commit_match(struct commit *commit, struct rev_info *opt)
1384{
1385 if (!opt->grep_filter)
1386 return 1;
1387 return grep_buffer(opt->grep_filter,
1388 NULL, /* we say nothing, not even filename */
1389 commit->buffer, strlen(commit->buffer));
1390}
1391static struct commit *get_revision_1(struct rev_info *revs)
1393{
1394 if (!revs->commits)
1395 return NULL;
1396 do {
1398 struct commit_list *entry = revs->commits;
1399 struct commit *commit = entry->item;
1400 revs->commits = entry->next;
1402 free(entry);
1403 if (revs->reflog_info)
1405 fake_reflog_parent(revs->reflog_info, commit);
1406 /*
1408 * If we haven't done the list limiting, we need to look at
1409 * the parents here. We also need to do the date-based limiting
1410 * that we'd otherwise have done in limit_list().
1411 */
1412 if (!revs->limited) {
1413 if (revs->max_age != -1 &&
1414 (commit->date < revs->max_age))
1415 continue;
1416 if (add_parents_to_list(revs, commit, &revs->commits) < 0)
1417 return NULL;
1418 }
1419 if (commit->object.flags & SHOWN)
1420 continue;
1421 if (revs->unpacked && has_sha1_pack(commit->object.sha1,
1423 revs->ignore_packed))
1424 continue;
1425 if (commit->object.flags & UNINTERESTING)
1427 continue;
1428 if (revs->min_age != -1 && (commit->date > revs->min_age))
1429 continue;
1430 if (revs->no_merges &&
1431 commit->parents && commit->parents->next)
1432 continue;
1433 if (!commit_match(commit, revs))
1434 continue;
1435 if (revs->prune_fn && revs->dense) {
1436 /* Commit without changes? */
1437 if (!(commit->object.flags & TREECHANGE)) {
1438 /* drop merges unless we want parenthood */
1439 if (!revs->parents)
1440 continue;
1441 /* non-merge - always ignore it */
1442 if (!commit->parents || !commit->parents->next)
1443 continue;
1444 }
1445 if (revs->parents && rewrite_parents(revs, commit) < 0)
1446 return NULL;
1447 }
1448 return commit;
1449 } while (revs->commits);
1450 return NULL;
1451}
1452static void gc_boundary(struct object_array *array)
1454{
1455 unsigned nr = array->nr;
1456 unsigned alloc = array->alloc;
1457 struct object_array_entry *objects = array->objects;
1458 if (alloc <= nr) {
1460 unsigned i, j;
1461 for (i = j = 0; i < nr; i++) {
1462 if (objects[i].item->flags & SHOWN)
1463 continue;
1464 if (i != j)
1465 objects[j] = objects[i];
1466 j++;
1467 }
1468 for (i = j; i < nr; i++)
1469 objects[i].item = NULL;
1470 array->nr = j;
1471 }
1472}
1473struct commit *get_revision(struct rev_info *revs)
1475{
1476 struct commit *c = NULL;
1477 struct commit_list *l;
1478 if (revs->boundary == 2) {
1480 unsigned i;
1481 struct object_array *array = &revs->boundary_commits;
1482 struct object_array_entry *objects = array->objects;
1483 for (i = 0; i < array->nr; i++) {
1484 c = (struct commit *)(objects[i].item);
1485 if (!c)
1486 continue;
1487 if (!(c->object.flags & CHILD_SHOWN))
1488 continue;
1489 if (!(c->object.flags & SHOWN))
1490 break;
1491 }
1492 if (array->nr <= i)
1493 return NULL;
1494 c->object.flags |= SHOWN | BOUNDARY;
1496 return c;
1497 }
1498 if (revs->reverse) {
1500 int limit = -1;
1501 if (0 <= revs->max_count) {
1503 limit = revs->max_count;
1504 if (0 < revs->skip_count)
1505 limit += revs->skip_count;
1506 }
1507 l = NULL;
1508 while ((c = get_revision_1(revs))) {
1509 commit_list_insert(c, &l);
1510 if ((0 < limit) && !--limit)
1511 break;
1512 }
1513 revs->commits = l;
1514 revs->reverse = 0;
1515 revs->max_count = -1;
1516 c = NULL;
1517 }
1518 /*
1520 * Now pick up what they want to give us
1521 */
1522 c = get_revision_1(revs);
1523 if (c) {
1524 while (0 < revs->skip_count) {
1525 revs->skip_count--;
1526 c = get_revision_1(revs);
1527 if (!c)
1528 break;
1529 }
1530 }
1531 /*
1533 * Check the max_count.
1534 */
1535 switch (revs->max_count) {
1536 case -1:
1537 break;
1538 case 0:
1539 c = NULL;
1540 break;
1541 default:
1542 revs->max_count--;
1543 }
1544 if (c)
1546 c->object.flags |= SHOWN;
1547 if (!revs->boundary) {
1549 return c;
1550 }
1551 if (!c) {
1553 /*
1554 * get_revision_1() runs out the commits, and
1555 * we are done computing the boundaries.
1556 * switch to boundary commits output mode.
1557 */
1558 revs->boundary = 2;
1559 return get_revision(revs);
1560 }
1561 /*
1563 * boundary commits are the commits that are parents of the
1564 * ones we got from get_revision_1() but they themselves are
1565 * not returned from get_revision_1(). Before returning
1566 * 'c', we need to mark its parents that they could be boundaries.
1567 */
1568 for (l = c->parents; l; l = l->next) {
1570 struct object *p;
1571 p = &(l->item->object);
1572 if (p->flags & (CHILD_SHOWN | SHOWN))
1573 continue;
1574 p->flags |= CHILD_SHOWN;
1575 gc_boundary(&revs->boundary_commits);
1576 add_object_array(p, NULL, &revs->boundary_commits);
1577 }
1578 return c;
1580}