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 add_object_array_with_mode(obj, name, &revs->pending, mode);
122 if (revs->reflog_info && obj->type == OBJ_COMMIT)
123 add_reflog_for_walk(revs->reflog_info,
124 (struct commit *)obj, name);
125}
126void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
128{
129 add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
130}
131static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
133{
134 struct object *object;
135 object = parse_object(sha1);
137 if (!object)
138 die("bad object %s", name);
139 object->flags |= flags;
140 return object;
141}
142static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
144{
145 unsigned long flags = object->flags;
146 /*
148 * Tag object? Look what it points to..
149 */
150 while (object->type == OBJ_TAG) {
151 struct tag *tag = (struct tag *) object;
152 if (revs->tag_objects && !(flags & UNINTERESTING))
153 add_pending_object(revs, object, tag->tag);
154 object = parse_object(tag->tagged->sha1);
155 if (!object)
156 die("bad object %s", sha1_to_hex(tag->tagged->sha1));
157 }
158 /*
160 * Commit object? Just return it, we'll do all the complex
161 * reachability crud.
162 */
163 if (object->type == OBJ_COMMIT) {
164 struct commit *commit = (struct commit *)object;
165 if (parse_commit(commit) < 0)
166 die("unable to parse commit %s", name);
167 if (flags & UNINTERESTING) {
168 commit->object.flags |= UNINTERESTING;
169 mark_parents_uninteresting(commit);
170 revs->limited = 1;
171 }
172 return commit;
173 }
174 /*
176 * Tree object? Either mark it uniniteresting, or add it
177 * to the list of objects to look at later..
178 */
179 if (object->type == OBJ_TREE) {
180 struct tree *tree = (struct tree *)object;
181 if (!revs->tree_objects)
182 return NULL;
183 if (flags & UNINTERESTING) {
184 mark_tree_uninteresting(tree);
185 return NULL;
186 }
187 add_pending_object(revs, object, "");
188 return NULL;
189 }
190 /*
192 * Blob object? You know the drill by now..
193 */
194 if (object->type == OBJ_BLOB) {
195 struct blob *blob = (struct blob *)object;
196 if (!revs->blob_objects)
197 return NULL;
198 if (flags & UNINTERESTING) {
199 mark_blob_uninteresting(blob);
200 return NULL;
201 }
202 add_pending_object(revs, object, "");
203 return NULL;
204 }
205 die("%s is unknown object", name);
206}
207static int everybody_uninteresting(struct commit_list *orig)
209{
210 struct commit_list *list = orig;
211 while (list) {
212 struct commit *commit = list->item;
213 list = list->next;
214 if (commit->object.flags & UNINTERESTING)
215 continue;
216 return 0;
217 }
218 return 1;
219}
220/*
222 * The goal is to get REV_TREE_NEW as the result only if the
223 * diff consists of all '+' (and no other changes), and
224 * REV_TREE_DIFFERENT otherwise (of course if the trees are
225 * the same we want REV_TREE_SAME). That means that once we
226 * get to REV_TREE_DIFFERENT, we do not have to look any further.
227 */
228static int tree_difference = REV_TREE_SAME;
229static void file_add_remove(struct diff_options *options,
231 int addremove, unsigned mode,
232 const unsigned char *sha1,
233 const char *base, const char *path)
234{
235 int diff = REV_TREE_DIFFERENT;
236 /*
238 * Is it an add of a new file? It means that the old tree
239 * didn't have it at all, so we will turn "REV_TREE_SAME" ->
240 * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
241 * (and if it already was "REV_TREE_NEW", we'll keep it
242 * "REV_TREE_NEW" of course).
243 */
244 if (addremove == '+') {
245 diff = tree_difference;
246 if (diff != REV_TREE_SAME)
247 return;
248 diff = REV_TREE_NEW;
249 }
250 tree_difference = diff;
251 if (tree_difference == REV_TREE_DIFFERENT)
252 options->has_changes = 1;
253}
254static void file_change(struct diff_options *options,
256 unsigned old_mode, unsigned new_mode,
257 const unsigned char *old_sha1,
258 const unsigned char *new_sha1,
259 const char *base, const char *path)
260{
261 tree_difference = REV_TREE_DIFFERENT;
262 options->has_changes = 1;
263}
264static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
266{
267 if (!t1)
268 return REV_TREE_NEW;
269 if (!t2)
270 return REV_TREE_DIFFERENT;
271 tree_difference = REV_TREE_SAME;
272 revs->pruning.has_changes = 0;
273 if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
274 &revs->pruning) < 0)
275 return REV_TREE_DIFFERENT;
276 return tree_difference;
277}
278static int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
280{
281 int retval;
282 void *tree;
283 unsigned long size;
284 struct tree_desc empty, real;
285 if (!t1)
287 return 0;
288 tree = read_object_with_reference(t1->object.sha1, tree_type, &size, NULL);
290 if (!tree)
291 return 0;
292 init_tree_desc(&real, tree, size);
293 init_tree_desc(&empty, "", 0);
294 tree_difference = REV_TREE_SAME;
296 revs->pruning.has_changes = 0;
297 retval = diff_tree(&empty, &real, "", &revs->pruning);
298 free(tree);
299 return retval >= 0 && (tree_difference == REV_TREE_SAME);
301}
302static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
304{
305 struct commit_list **pp, *parent;
306 int tree_changed = 0, tree_same = 0;
307 if (!commit->tree)
309 return;
310 if (!commit->parents) {
312 if (!rev_same_tree_as_empty(revs, commit->tree))
313 commit->object.flags |= TREECHANGE;
314 return;
315 }
316 pp = &commit->parents;
318 while ((parent = *pp) != NULL) {
319 struct commit *p = parent->item;
320 if (parse_commit(p) < 0)
322 die("cannot simplify commit %s (because of %s)",
323 sha1_to_hex(commit->object.sha1),
324 sha1_to_hex(p->object.sha1));
325 switch (rev_compare_tree(revs, p->tree, commit->tree)) {
326 case REV_TREE_SAME:
327 tree_same = 1;
328 if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
329 /* Even if a merge with an uninteresting
330 * side branch brought the entire change
331 * we are interested in, we do not want
332 * to lose the other branches of this
333 * merge, so we just keep going.
334 */
335 pp = &parent->next;
336 continue;
337 }
338 parent->next = NULL;
339 commit->parents = parent;
340 return;
341 case REV_TREE_NEW:
343 if (revs->remove_empty_trees &&
344 rev_same_tree_as_empty(revs, p->tree)) {
345 /* We are adding all the specified
346 * paths from this parent, so the
347 * history beyond this parent is not
348 * interesting. Remove its parents
349 * (they are grandparents for us).
350 * IOW, we pretend this parent is a
351 * "root" commit.
352 */
353 if (parse_commit(p) < 0)
354 die("cannot simplify commit %s (invalid %s)",
355 sha1_to_hex(commit->object.sha1),
356 sha1_to_hex(p->object.sha1));
357 p->parents = NULL;
358 }
359 /* fallthrough */
360 case REV_TREE_DIFFERENT:
361 tree_changed = 1;
362 pp = &parent->next;
363 continue;
364 }
365 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
366 }
367 if (tree_changed && !tree_same)
368 commit->object.flags |= TREECHANGE;
369}
370static int add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
372{
373 struct commit_list *parent = commit->parents;
374 unsigned left_flag;
375 int add, rest;
376 if (commit->object.flags & ADDED)
378 return 0;
379 commit->object.flags |= ADDED;
380 /*
382 * If the commit is uninteresting, don't try to
383 * prune parents - we want the maximal uninteresting
384 * set.
385 *
386 * Normally we haven't parsed the parent
387 * yet, so we won't have a parent of a parent
388 * here. However, it may turn out that we've
389 * reached this commit some other way (where it
390 * wasn't uninteresting), in which case we need
391 * to mark its parents recursively too..
392 */
393 if (commit->object.flags & UNINTERESTING) {
394 while (parent) {
395 struct commit *p = parent->item;
396 parent = parent->next;
397 if (parse_commit(p) < 0)
398 return -1;
399 p->object.flags |= UNINTERESTING;
400 if (p->parents)
401 mark_parents_uninteresting(p);
402 if (p->object.flags & SEEN)
403 continue;
404 p->object.flags |= SEEN;
405 insert_by_date(p, list);
406 }
407 return 0;
408 }
409 /*
411 * Ok, the commit wasn't uninteresting. Try to
412 * simplify the commit history and find the parent
413 * that has no differences in the path set if one exists.
414 */
415 if (revs->prune_fn)
416 revs->prune_fn(revs, commit);
417 if (revs->no_walk)
419 return 0;
420 left_flag = (commit->object.flags & SYMMETRIC_LEFT);
422 rest = !revs->first_parent_only;
424 for (parent = commit->parents, add = 1; parent; add = rest) {
425 struct commit *p = parent->item;
426 parent = parent->next;
428 if (parse_commit(p) < 0)
429 return -1;
430 p->object.flags |= left_flag;
431 if (p->object.flags & SEEN)
432 continue;
433 p->object.flags |= SEEN;
434 if (add)
435 insert_by_date(p, list);
436 }
437 return 0;
438}
439static void cherry_pick_list(struct commit_list *list)
441{
442 struct commit_list *p;
443 int left_count = 0, right_count = 0;
444 int left_first;
445 struct patch_ids ids;
446 /* First count the commits on the left and on the right */
448 for (p = list; p; p = p->next) {
449 struct commit *commit = p->item;
450 unsigned flags = commit->object.flags;
451 if (flags & BOUNDARY)
452 ;
453 else if (flags & SYMMETRIC_LEFT)
454 left_count++;
455 else
456 right_count++;
457 }
458 left_first = left_count < right_count;
460 init_patch_ids(&ids);
461 /* Compute patch-ids for one side */
463 for (p = list; p; p = p->next) {
464 struct commit *commit = p->item;
465 unsigned flags = commit->object.flags;
466 if (flags & BOUNDARY)
468 continue;
469 /*
470 * If we have fewer left, left_first is set and we omit
471 * commits on the right branch in this loop. If we have
472 * fewer right, we skip the left ones.
473 */
474 if (left_first != !!(flags & SYMMETRIC_LEFT))
475 continue;
476 commit->util = add_commit_patch_id(commit, &ids);
477 }
478 /* Check the other side */
480 for (p = list; p; p = p->next) {
481 struct commit *commit = p->item;
482 struct patch_id *id;
483 unsigned flags = commit->object.flags;
484 if (flags & BOUNDARY)
486 continue;
487 /*
488 * If we have fewer left, left_first is set and we omit
489 * commits on the left branch in this loop.
490 */
491 if (left_first == !!(flags & SYMMETRIC_LEFT))
492 continue;
493 /*
495 * Have we seen the same patch id?
496 */
497 id = has_commit_patch_id(commit, &ids);
498 if (!id)
499 continue;
500 id->seen = 1;
501 commit->object.flags |= SHOWN;
502 }
503 /* Now check the original side for seen ones */
505 for (p = list; p; p = p->next) {
506 struct commit *commit = p->item;
507 struct patch_id *ent;
508 ent = commit->util;
510 if (!ent)
511 continue;
512 if (ent->seen)
513 commit->object.flags |= SHOWN;
514 commit->util = NULL;
515 }
516 free_patch_ids(&ids);
518}
519static int limit_list(struct rev_info *revs)
521{
522 struct commit_list *list = revs->commits;
523 struct commit_list *newlist = NULL;
524 struct commit_list **p = &newlist;
525 while (list) {
527 struct commit_list *entry = list;
528 struct commit *commit = list->item;
529 struct object *obj = &commit->object;
530 list = list->next;
532 free(entry);
533 if (revs->max_age != -1 && (commit->date < revs->max_age))
535 obj->flags |= UNINTERESTING;
536 if (add_parents_to_list(revs, commit, &list) < 0)
537 return -1;
538 if (obj->flags & UNINTERESTING) {
539 mark_parents_uninteresting(commit);
540 if (everybody_uninteresting(list))
541 break;
542 continue;
543 }
544 if (revs->min_age != -1 && (commit->date > revs->min_age))
545 continue;
546 p = &commit_list_insert(commit, p)->next;
547 }
548 if (revs->cherry_pick)
549 cherry_pick_list(newlist);
550 revs->commits = newlist;
552 return 0;
553}
554struct all_refs_cb {
556 int all_flags;
557 int warned_bad_reflog;
558 struct rev_info *all_revs;
559 const char *name_for_errormsg;
560};
561static int handle_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
563{
564 struct all_refs_cb *cb = cb_data;
565 struct object *object = get_reference(cb->all_revs, path, sha1,
566 cb->all_flags);
567 add_pending_object(cb->all_revs, object, path);
568 return 0;
569}
570static void handle_all(struct rev_info *revs, unsigned flags)
572{
573 struct all_refs_cb cb;
574 cb.all_revs = revs;
575 cb.all_flags = flags;
576 for_each_ref(handle_one_ref, &cb);
577}
578static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
580{
581 struct all_refs_cb *cb = cb_data;
582 if (!is_null_sha1(sha1)) {
583 struct object *o = parse_object(sha1);
584 if (o) {
585 o->flags |= cb->all_flags;
586 add_pending_object(cb->all_revs, o, "");
587 }
588 else if (!cb->warned_bad_reflog) {
589 warning("reflog of '%s' references pruned commits",
590 cb->name_for_errormsg);
591 cb->warned_bad_reflog = 1;
592 }
593 }
594}
595static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
597 const char *email, unsigned long timestamp, int tz,
598 const char *message, void *cb_data)
599{
600 handle_one_reflog_commit(osha1, cb_data);
601 handle_one_reflog_commit(nsha1, cb_data);
602 return 0;
603}
604static int handle_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
606{
607 struct all_refs_cb *cb = cb_data;
608 cb->warned_bad_reflog = 0;
609 cb->name_for_errormsg = path;
610 for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
611 return 0;
612}
613static void handle_reflog(struct rev_info *revs, unsigned flags)
615{
616 struct all_refs_cb cb;
617 cb.all_revs = revs;
618 cb.all_flags = flags;
619 for_each_reflog(handle_one_reflog, &cb);
620}
621static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
623{
624 unsigned char sha1[20];
625 struct object *it;
626 struct commit *commit;
627 struct commit_list *parents;
628 if (*arg == '^') {
630 flags ^= UNINTERESTING;
631 arg++;
632 }
633 if (get_sha1(arg, sha1))
634 return 0;
635 while (1) {
636 it = get_reference(revs, arg, sha1, 0);
637 if (it->type != OBJ_TAG)
638 break;
639 hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
640 }
641 if (it->type != OBJ_COMMIT)
642 return 0;
643 commit = (struct commit *)it;
644 for (parents = commit->parents; parents; parents = parents->next) {
645 it = &parents->item->object;
646 it->flags |= flags;
647 add_pending_object(revs, it, arg);
648 }
649 return 1;
650}
651void init_revisions(struct rev_info *revs, const char *prefix)
653{
654 memset(revs, 0, sizeof(*revs));
655 revs->abbrev = DEFAULT_ABBREV;
657 revs->ignore_merges = 1;
658 revs->simplify_history = 1;
659 revs->pruning.recursive = 1;
660 revs->pruning.quiet = 1;
661 revs->pruning.add_remove = file_add_remove;
662 revs->pruning.change = file_change;
663 revs->lifo = 1;
664 revs->dense = 1;
665 revs->prefix = prefix;
666 revs->max_age = -1;
667 revs->min_age = -1;
668 revs->skip_count = -1;
669 revs->max_count = -1;
670 revs->subject_prefix = "PATCH";
671 revs->prune_fn = NULL;
673 revs->prune_data = NULL;
674 revs->topo_setter = topo_sort_default_setter;
676 revs->topo_getter = topo_sort_default_getter;
677 revs->commit_format = CMIT_FMT_DEFAULT;
679 diff_setup(&revs->diffopt);
681}
682static void add_pending_commit_list(struct rev_info *revs,
684 struct commit_list *commit_list,
685 unsigned int flags)
686{
687 while (commit_list) {
688 struct object *object = &commit_list->item->object;
689 object->flags |= flags;
690 add_pending_object(revs, object, sha1_to_hex(object->sha1));
691 commit_list = commit_list->next;
692 }
693}
694static void prepare_show_merge(struct rev_info *revs)
696{
697 struct commit_list *bases;
698 struct commit *head, *other;
699 unsigned char sha1[20];
700 const char **prune = NULL;
701 int i, prune_num = 1; /* counting terminating NULL */
702 if (get_sha1("HEAD", sha1) || !(head = lookup_commit(sha1)))
704 die("--merge without HEAD?");
705 if (get_sha1("MERGE_HEAD", sha1) || !(other = lookup_commit(sha1)))
706 die("--merge without MERGE_HEAD?");
707 add_pending_object(revs, &head->object, "HEAD");
708 add_pending_object(revs, &other->object, "MERGE_HEAD");
709 bases = get_merge_bases(head, other, 1);
710 while (bases) {
711 struct commit *it = bases->item;
712 struct commit_list *n = bases->next;
713 free(bases);
714 bases = n;
715 it->object.flags |= UNINTERESTING;
716 add_pending_object(revs, &it->object, "(merge-base)");
717 }
718 if (!active_nr)
720 read_cache();
721 for (i = 0; i < active_nr; i++) {
722 struct cache_entry *ce = active_cache[i];
723 if (!ce_stage(ce))
724 continue;
725 if (ce_path_match(ce, revs->prune_data)) {
726 prune_num++;
727 prune = xrealloc(prune, sizeof(*prune) * prune_num);
728 prune[prune_num-2] = ce->name;
729 prune[prune_num-1] = NULL;
730 }
731 while ((i+1 < active_nr) &&
732 ce_same_name(ce, active_cache[i+1]))
733 i++;
734 }
735 revs->prune_data = prune;
736}
737int handle_revision_arg(const char *arg, struct rev_info *revs,
739 int flags,
740 int cant_be_filename)
741{
742 unsigned mode;
743 char *dotdot;
744 struct object *object;
745 unsigned char sha1[20];
746 int local_flags;
747 dotdot = strstr(arg, "..");
749 if (dotdot) {
750 unsigned char from_sha1[20];
751 const char *next = dotdot + 2;
752 const char *this = arg;
753 int symmetric = *next == '.';
754 unsigned int flags_exclude = flags ^ UNINTERESTING;
755 *dotdot = 0;
757 next += symmetric;
758 if (!*next)
760 next = "HEAD";
761 if (dotdot == arg)
762 this = "HEAD";
763 if (!get_sha1(this, from_sha1) &&
764 !get_sha1(next, sha1)) {
765 struct commit *a, *b;
766 struct commit_list *exclude;
767 a = lookup_commit_reference(from_sha1);
769 b = lookup_commit_reference(sha1);
770 if (!a || !b) {
771 die(symmetric ?
772 "Invalid symmetric difference expression %s...%s" :
773 "Invalid revision range %s..%s",
774 arg, next);
775 }
776 if (!cant_be_filename) {
778 *dotdot = '.';
779 verify_non_filename(revs->prefix, arg);
780 }
781 if (symmetric) {
783 exclude = get_merge_bases(a, b, 1);
784 add_pending_commit_list(revs, exclude,
785 flags_exclude);
786 free_commit_list(exclude);
787 a->object.flags |= flags | SYMMETRIC_LEFT;
788 } else
789 a->object.flags |= flags_exclude;
790 b->object.flags |= flags;
791 add_pending_object(revs, &a->object, this);
792 add_pending_object(revs, &b->object, next);
793 return 0;
794 }
795 *dotdot = '.';
796 }
797 dotdot = strstr(arg, "^@");
798 if (dotdot && !dotdot[2]) {
799 *dotdot = 0;
800 if (add_parents_only(revs, arg, flags))
801 return 0;
802 *dotdot = '^';
803 }
804 dotdot = strstr(arg, "^!");
805 if (dotdot && !dotdot[2]) {
806 *dotdot = 0;
807 if (!add_parents_only(revs, arg, flags ^ UNINTERESTING))
808 *dotdot = '^';
809 }
810 local_flags = 0;
812 if (*arg == '^') {
813 local_flags = UNINTERESTING;
814 arg++;
815 }
816 if (get_sha1_with_mode(arg, sha1, &mode))
817 return -1;
818 if (!cant_be_filename)
819 verify_non_filename(revs->prefix, arg);
820 object = get_reference(revs, arg, sha1, flags ^ local_flags);
821 add_pending_object_with_mode(revs, object, arg, mode);
822 return 0;
823}
824static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
826{
827 if (!revs->grep_filter) {
828 struct grep_opt *opt = xcalloc(1, sizeof(*opt));
829 opt->status_only = 1;
830 opt->pattern_tail = &(opt->pattern_list);
831 opt->regflags = REG_NEWLINE;
832 revs->grep_filter = opt;
833 }
834 append_grep_pattern(revs->grep_filter, ptn,
835 "command line", 0, what);
836}
837static void add_header_grep(struct rev_info *revs, const char *field, const char *pattern)
839{
840 char *pat;
841 const char *prefix;
842 int patlen, fldlen;
843 fldlen = strlen(field);
845 patlen = strlen(pattern);
846 pat = xmalloc(patlen + fldlen + 10);
847 prefix = ".*";
848 if (*pattern == '^') {
849 prefix = "";
850 pattern++;
851 }
852 sprintf(pat, "^%s %s%s", field, prefix, pattern);
853 add_grep(revs, pat, GREP_PATTERN_HEAD);
854}
855static void add_message_grep(struct rev_info *revs, const char *pattern)
857{
858 add_grep(revs, pattern, GREP_PATTERN_BODY);
859}
860static void add_ignore_packed(struct rev_info *revs, const char *name)
862{
863 int num = ++revs->num_ignore_packed;
864 revs->ignore_packed = xrealloc(revs->ignore_packed,
866 sizeof(const char **) * (num + 1));
867 revs->ignore_packed[num-1] = name;
868 revs->ignore_packed[num] = NULL;
869}
870/*
872 * Parse revision information, filling in the "rev_info" structure,
873 * and removing the used arguments from the argument list.
874 *
875 * Returns the number of arguments left that weren't recognized
876 * (which are also moved to the head of the argument list)
877 */
878int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
879{
880 int i, flags, seen_dashdash, show_merge;
881 const char **unrecognized = argv + 1;
882 int left = 1;
883 int all_match = 0;
884 int regflags = 0;
885 /* First, search for "--" */
887 seen_dashdash = 0;
888 for (i = 1; i < argc; i++) {
889 const char *arg = argv[i];
890 if (strcmp(arg, "--"))
891 continue;
892 argv[i] = NULL;
893 argc = i;
894 revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
895 seen_dashdash = 1;
896 break;
897 }
898 flags = show_merge = 0;
900 for (i = 1; i < argc; i++) {
901 const char *arg = argv[i];
902 if (*arg == '-') {
903 int opts;
904 if (!prefixcmp(arg, "--max-count=")) {
905 revs->max_count = atoi(arg + 12);
906 continue;
907 }
908 if (!prefixcmp(arg, "--skip=")) {
909 revs->skip_count = atoi(arg + 7);
910 continue;
911 }
912 /* accept -<digit>, like traditional "head" */
913 if ((*arg == '-') && isdigit(arg[1])) {
914 revs->max_count = atoi(arg + 1);
915 continue;
916 }
917 if (!strcmp(arg, "-n")) {
918 if (argc <= i + 1)
919 die("-n requires an argument");
920 revs->max_count = atoi(argv[++i]);
921 continue;
922 }
923 if (!prefixcmp(arg, "-n")) {
924 revs->max_count = atoi(arg + 2);
925 continue;
926 }
927 if (!prefixcmp(arg, "--max-age=")) {
928 revs->max_age = atoi(arg + 10);
929 continue;
930 }
931 if (!prefixcmp(arg, "--since=")) {
932 revs->max_age = approxidate(arg + 8);
933 continue;
934 }
935 if (!prefixcmp(arg, "--after=")) {
936 revs->max_age = approxidate(arg + 8);
937 continue;
938 }
939 if (!prefixcmp(arg, "--min-age=")) {
940 revs->min_age = atoi(arg + 10);
941 continue;
942 }
943 if (!prefixcmp(arg, "--before=")) {
944 revs->min_age = approxidate(arg + 9);
945 continue;
946 }
947 if (!prefixcmp(arg, "--until=")) {
948 revs->min_age = approxidate(arg + 8);
949 continue;
950 }
951 if (!strcmp(arg, "--all")) {
952 handle_all(revs, flags);
953 continue;
954 }
955 if (!strcmp(arg, "--first-parent")) {
956 revs->first_parent_only = 1;
957 continue;
958 }
959 if (!strcmp(arg, "--reflog")) {
960 handle_reflog(revs, flags);
961 continue;
962 }
963 if (!strcmp(arg, "-g") ||
964 !strcmp(arg, "--walk-reflogs")) {
965 init_reflog_walk(&revs->reflog_info);
966 continue;
967 }
968 if (!strcmp(arg, "--not")) {
969 flags ^= UNINTERESTING;
970 continue;
971 }
972 if (!strcmp(arg, "--default")) {
973 if (++i >= argc)
974 die("bad --default argument");
975 def = argv[i];
976 continue;
977 }
978 if (!strcmp(arg, "--merge")) {
979 show_merge = 1;
980 continue;
981 }
982 if (!strcmp(arg, "--topo-order")) {
983 revs->topo_order = 1;
984 continue;
985 }
986 if (!strcmp(arg, "--date-order")) {
987 revs->lifo = 0;
988 revs->topo_order = 1;
989 continue;
990 }
991 if (!strcmp(arg, "--parents")) {
992 revs->parents = 1;
993 continue;
994 }
995 if (!strcmp(arg, "--dense")) {
996 revs->dense = 1;
997 continue;
998 }
999 if (!strcmp(arg, "--sparse")) {
1000 revs->dense = 0;
1001 continue;
1002 }
1003 if (!strcmp(arg, "--remove-empty")) {
1004 revs->remove_empty_trees = 1;
1005 continue;
1006 }
1007 if (!strcmp(arg, "--no-merges")) {
1008 revs->no_merges = 1;
1009 continue;
1010 }
1011 if (!strcmp(arg, "--boundary")) {
1012 revs->boundary = 1;
1013 continue;
1014 }
1015 if (!strcmp(arg, "--left-right")) {
1016 revs->left_right = 1;
1017 continue;
1018 }
1019 if (!strcmp(arg, "--cherry-pick")) {
1020 revs->cherry_pick = 1;
1021 continue;
1022 }
1023 if (!strcmp(arg, "--objects")) {
1024 revs->tag_objects = 1;
1025 revs->tree_objects = 1;
1026 revs->blob_objects = 1;
1027 continue;
1028 }
1029 if (!strcmp(arg, "--objects-edge")) {
1030 revs->tag_objects = 1;
1031 revs->tree_objects = 1;
1032 revs->blob_objects = 1;
1033 revs->edge_hint = 1;
1034 continue;
1035 }
1036 if (!strcmp(arg, "--unpacked")) {
1037 revs->unpacked = 1;
1038 free(revs->ignore_packed);
1039 revs->ignore_packed = NULL;
1040 revs->num_ignore_packed = 0;
1041 continue;
1042 }
1043 if (!prefixcmp(arg, "--unpacked=")) {
1044 revs->unpacked = 1;
1045 add_ignore_packed(revs, arg+11);
1046 continue;
1047 }
1048 if (!strcmp(arg, "-r")) {
1049 revs->diff = 1;
1050 revs->diffopt.recursive = 1;
1051 continue;
1052 }
1053 if (!strcmp(arg, "-t")) {
1054 revs->diff = 1;
1055 revs->diffopt.recursive = 1;
1056 revs->diffopt.tree_in_recursive = 1;
1057 continue;
1058 }
1059 if (!strcmp(arg, "-m")) {
1060 revs->ignore_merges = 0;
1061 continue;
1062 }
1063 if (!strcmp(arg, "-c")) {
1064 revs->diff = 1;
1065 revs->dense_combined_merges = 0;
1066 revs->combine_merges = 1;
1067 continue;
1068 }
1069 if (!strcmp(arg, "--cc")) {
1070 revs->diff = 1;
1071 revs->dense_combined_merges = 1;
1072 revs->combine_merges = 1;
1073 continue;
1074 }
1075 if (!strcmp(arg, "-v")) {
1076 revs->verbose_header = 1;
1077 continue;
1078 }
1079 if (!prefixcmp(arg, "--pretty")) {
1080 revs->verbose_header = 1;
1081 revs->commit_format = get_commit_format(arg+8);
1082 continue;
1083 }
1084 if (!strcmp(arg, "--root")) {
1085 revs->show_root_diff = 1;
1086 continue;
1087 }
1088 if (!strcmp(arg, "--no-commit-id")) {
1089 revs->no_commit_id = 1;
1090 continue;
1091 }
1092 if (!strcmp(arg, "--always")) {
1093 revs->always_show_header = 1;
1094 continue;
1095 }
1096 if (!strcmp(arg, "--no-abbrev")) {
1097 revs->abbrev = 0;
1098 continue;
1099 }
1100 if (!strcmp(arg, "--abbrev")) {
1101 revs->abbrev = DEFAULT_ABBREV;
1102 continue;
1103 }
1104 if (!prefixcmp(arg, "--abbrev=")) {
1105 revs->abbrev = strtoul(arg + 9, NULL, 10);
1106 if (revs->abbrev < MINIMUM_ABBREV)
1107 revs->abbrev = MINIMUM_ABBREV;
1108 else if (revs->abbrev > 40)
1109 revs->abbrev = 40;
1110 continue;
1111 }
1112 if (!strcmp(arg, "--abbrev-commit")) {
1113 revs->abbrev_commit = 1;
1114 continue;
1115 }
1116 if (!strcmp(arg, "--full-diff")) {
1117 revs->diff = 1;
1118 revs->full_diff = 1;
1119 continue;
1120 }
1121 if (!strcmp(arg, "--full-history")) {
1122 revs->simplify_history = 0;
1123 continue;
1124 }
1125 if (!strcmp(arg, "--relative-date")) {
1126 revs->date_mode = DATE_RELATIVE;
1127 continue;
1128 }
1129 if (!strncmp(arg, "--date=", 7)) {
1130 if (!strcmp(arg + 7, "relative"))
1131 revs->date_mode = DATE_RELATIVE;
1132 else if (!strcmp(arg + 7, "local"))
1133 revs->date_mode = DATE_LOCAL;
1134 else if (!strcmp(arg + 7, "default"))
1135 revs->date_mode = DATE_NORMAL;
1136 else
1137 die("unknown date format %s", arg);
1138 continue;
1139 }
1140 /*
1142 * Grepping the commit log
1143 */
1144 if (!prefixcmp(arg, "--author=")) {
1145 add_header_grep(revs, "author", arg+9);
1146 continue;
1147 }
1148 if (!prefixcmp(arg, "--committer=")) {
1149 add_header_grep(revs, "committer", arg+12);
1150 continue;
1151 }
1152 if (!prefixcmp(arg, "--grep=")) {
1153 add_message_grep(revs, arg+7);
1154 continue;
1155 }
1156 if (!prefixcmp(arg, "--extended-regexp")) {
1157 regflags |= REG_EXTENDED;
1158 continue;
1159 }
1160 if (!prefixcmp(arg, "--regexp-ignore-case")) {
1161 regflags |= REG_ICASE;
1162 continue;
1163 }
1164 if (!strcmp(arg, "--all-match")) {
1165 all_match = 1;
1166 continue;
1167 }
1168 if (!prefixcmp(arg, "--encoding=")) {
1169 arg += 11;
1170 if (strcmp(arg, "none"))
1171 git_log_output_encoding = xstrdup(arg);
1172 else
1173 git_log_output_encoding = "";
1174 continue;
1175 }
1176 if (!strcmp(arg, "--reverse")) {
1177 revs->reverse ^= 1;
1178 continue;
1179 }
1180 opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
1182 if (opts > 0) {
1183 if (strcmp(argv[i], "-z"))
1184 revs->diff = 1;
1185 i += opts - 1;
1186 continue;
1187 }
1188 *unrecognized++ = arg;
1189 left++;
1190 continue;
1191 }
1192 if (handle_revision_arg(arg, revs, flags, seen_dashdash)) {
1194 int j;
1195 if (seen_dashdash || *arg == '^')
1196 die("bad revision '%s'", arg);
1197 /* If we didn't have a "--":
1199 * (1) all filenames must exist;
1200 * (2) all rev-args must not be interpretable
1201 * as a valid filename.
1202 * but the latter we have checked in the main loop.
1203 */
1204 for (j = i; j < argc; j++)
1205 verify_filename(revs->prefix, argv[j]);
1206 revs->prune_data = get_pathspec(revs->prefix,
1208 argv + i);
1209 break;
1210 }
1211 }
1212 if (revs->grep_filter)
1214 revs->grep_filter->regflags |= regflags;
1215 if (show_merge)
1217 prepare_show_merge(revs);
1218 if (def && !revs->pending.nr) {
1219 unsigned char sha1[20];
1220 struct object *object;
1221 unsigned mode;
1222 if (get_sha1_with_mode(def, sha1, &mode))
1223 die("bad default revision '%s'", def);
1224 object = get_reference(revs, def, sha1, 0);
1225 add_pending_object_with_mode(revs, object, def, mode);
1226 }
1227 if (revs->topo_order)
1229 revs->limited = 1;
1230 if (revs->prune_data) {
1232 diff_tree_setup_paths(revs->prune_data, &revs->pruning);
1233 revs->prune_fn = try_to_simplify_commit;
1234 if (!revs->full_diff)
1235 diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
1236 }
1237 if (revs->combine_merges) {
1238 revs->ignore_merges = 0;
1239 if (revs->dense_combined_merges && !revs->diffopt.output_format)
1240 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
1241 }
1242 revs->diffopt.abbrev = revs->abbrev;
1243 if (diff_setup_done(&revs->diffopt) < 0)
1244 die("diff_setup_done failed");
1245 if (revs->grep_filter) {
1247 revs->grep_filter->all_match = all_match;
1248 compile_grep_patterns(revs->grep_filter);
1249 }
1250 return left;
1252}
1253int prepare_revision_walk(struct rev_info *revs)
1255{
1256 int nr = revs->pending.nr;
1257 struct object_array_entry *e, *list;
1258 e = list = revs->pending.objects;
1260 revs->pending.nr = 0;
1261 revs->pending.alloc = 0;
1262 revs->pending.objects = NULL;
1263 while (--nr >= 0) {
1264 struct commit *commit = handle_commit(revs, e->item, e->name);
1265 if (commit) {
1266 if (!(commit->object.flags & SEEN)) {
1267 commit->object.flags |= SEEN;
1268 insert_by_date(commit, &revs->commits);
1269 }
1270 }
1271 e++;
1272 }
1273 free(list);
1274 if (revs->no_walk)
1276 return 0;
1277 if (revs->limited)
1278 if (limit_list(revs) < 0)
1279 return -1;
1280 if (revs->topo_order)
1281 sort_in_topological_order_fn(&revs->commits, revs->lifo,
1282 revs->topo_setter,
1283 revs->topo_getter);
1284 return 0;
1285}
1286enum rewrite_result {
1288 rewrite_one_ok,
1289 rewrite_one_noparents,
1290 rewrite_one_error,
1291};
1292static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
1294{
1295 for (;;) {
1296 struct commit *p = *pp;
1297 if (!revs->limited)
1298 if (add_parents_to_list(revs, p, &revs->commits) < 0)
1299 return rewrite_one_error;
1300 if (p->parents && p->parents->next)
1301 return rewrite_one_ok;
1302 if (p->object.flags & (TREECHANGE | UNINTERESTING))
1303 return rewrite_one_ok;
1304 if (!p->parents)
1305 return rewrite_one_noparents;
1306 *pp = p->parents->item;
1307 }
1308}
1309static int rewrite_parents(struct rev_info *revs, struct commit *commit)
1311{
1312 struct commit_list **pp = &commit->parents;
1313 while (*pp) {
1314 struct commit_list *parent = *pp;
1315 switch (rewrite_one(revs, &parent->item)) {
1316 case rewrite_one_ok:
1317 break;
1318 case rewrite_one_noparents:
1319 *pp = parent->next;
1320 continue;
1321 case rewrite_one_error:
1322 return -1;
1323 }
1324 pp = &parent->next;
1325 }
1326 return 0;
1327}
1328static int commit_match(struct commit *commit, struct rev_info *opt)
1330{
1331 if (!opt->grep_filter)
1332 return 1;
1333 return grep_buffer(opt->grep_filter,
1334 NULL, /* we say nothing, not even filename */
1335 commit->buffer, strlen(commit->buffer));
1336}
1337static struct commit *get_revision_1(struct rev_info *revs)
1339{
1340 if (!revs->commits)
1341 return NULL;
1342 do {
1344 struct commit_list *entry = revs->commits;
1345 struct commit *commit = entry->item;
1346 revs->commits = entry->next;
1348 free(entry);
1349 if (revs->reflog_info)
1351 fake_reflog_parent(revs->reflog_info, commit);
1352 /*
1354 * If we haven't done the list limiting, we need to look at
1355 * the parents here. We also need to do the date-based limiting
1356 * that we'd otherwise have done in limit_list().
1357 */
1358 if (!revs->limited) {
1359 if (revs->max_age != -1 &&
1360 (commit->date < revs->max_age))
1361 continue;
1362 if (add_parents_to_list(revs, commit, &revs->commits) < 0)
1363 return NULL;
1364 }
1365 if (commit->object.flags & SHOWN)
1366 continue;
1367 if (revs->unpacked && has_sha1_pack(commit->object.sha1,
1369 revs->ignore_packed))
1370 continue;
1371 if (commit->object.flags & UNINTERESTING)
1373 continue;
1374 if (revs->min_age != -1 && (commit->date > revs->min_age))
1375 continue;
1376 if (revs->no_merges &&
1377 commit->parents && commit->parents->next)
1378 continue;
1379 if (!commit_match(commit, revs))
1380 continue;
1381 if (revs->prune_fn && revs->dense) {
1382 /* Commit without changes? */
1383 if (!(commit->object.flags & TREECHANGE)) {
1384 /* drop merges unless we want parenthood */
1385 if (!revs->parents)
1386 continue;
1387 /* non-merge - always ignore it */
1388 if (!commit->parents || !commit->parents->next)
1389 continue;
1390 }
1391 if (revs->parents && rewrite_parents(revs, commit) < 0)
1392 return NULL;
1393 }
1394 return commit;
1395 } while (revs->commits);
1396 return NULL;
1397}
1398static void gc_boundary(struct object_array *array)
1400{
1401 unsigned nr = array->nr;
1402 unsigned alloc = array->alloc;
1403 struct object_array_entry *objects = array->objects;
1404 if (alloc <= nr) {
1406 unsigned i, j;
1407 for (i = j = 0; i < nr; i++) {
1408 if (objects[i].item->flags & SHOWN)
1409 continue;
1410 if (i != j)
1411 objects[j] = objects[i];
1412 j++;
1413 }
1414 for (i = j; i < nr; i++)
1415 objects[i].item = NULL;
1416 array->nr = j;
1417 }
1418}
1419struct commit *get_revision(struct rev_info *revs)
1421{
1422 struct commit *c = NULL;
1423 struct commit_list *l;
1424 if (revs->boundary == 2) {
1426 unsigned i;
1427 struct object_array *array = &revs->boundary_commits;
1428 struct object_array_entry *objects = array->objects;
1429 for (i = 0; i < array->nr; i++) {
1430 c = (struct commit *)(objects[i].item);
1431 if (!c)
1432 continue;
1433 if (!(c->object.flags & CHILD_SHOWN))
1434 continue;
1435 if (!(c->object.flags & SHOWN))
1436 break;
1437 }
1438 if (array->nr <= i)
1439 return NULL;
1440 c->object.flags |= SHOWN | BOUNDARY;
1442 return c;
1443 }
1444 if (revs->reverse) {
1446 int limit = -1;
1447 if (0 <= revs->max_count) {
1449 limit = revs->max_count;
1450 if (0 < revs->skip_count)
1451 limit += revs->skip_count;
1452 }
1453 l = NULL;
1454 while ((c = get_revision_1(revs))) {
1455 commit_list_insert(c, &l);
1456 if ((0 < limit) && !--limit)
1457 break;
1458 }
1459 revs->commits = l;
1460 revs->reverse = 0;
1461 revs->max_count = -1;
1462 c = NULL;
1463 }
1464 /*
1466 * Now pick up what they want to give us
1467 */
1468 c = get_revision_1(revs);
1469 if (c) {
1470 while (0 < revs->skip_count) {
1471 revs->skip_count--;
1472 c = get_revision_1(revs);
1473 if (!c)
1474 break;
1475 }
1476 }
1477 /*
1479 * Check the max_count.
1480 */
1481 switch (revs->max_count) {
1482 case -1:
1483 break;
1484 case 0:
1485 c = NULL;
1486 break;
1487 default:
1488 revs->max_count--;
1489 }
1490 if (c)
1492 c->object.flags |= SHOWN;
1493 if (!revs->boundary) {
1495 return c;
1496 }
1497 if (!c) {
1499 /*
1500 * get_revision_1() runs out the commits, and
1501 * we are done computing the boundaries.
1502 * switch to boundary commits output mode.
1503 */
1504 revs->boundary = 2;
1505 return get_revision(revs);
1506 }
1507 /*
1509 * boundary commits are the commits that are parents of the
1510 * ones we got from get_revision_1() but they themselves are
1511 * not returned from get_revision_1(). Before returning
1512 * 'c', we need to mark its parents that they could be boundaries.
1513 */
1514 for (l = c->parents; l; l = l->next) {
1516 struct object *p;
1517 p = &(l->item->object);
1518 if (p->flags & (CHILD_SHOWN | SHOWN))
1519 continue;
1520 p->flags |= CHILD_SHOWN;
1521 gc_boundary(&revs->boundary_commits);
1522 add_object_array(p, NULL, &revs->boundary_commits);
1523 }
1524 return c;
1526}