ebd025064c82a3f6190a83e808e8bcf73478dacc
[git/git.git] / revision.c
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
12 static char *path_name(struct name_path *path, const char *name)
13 {
14 struct name_path *p;
15 char *n, *m;
16 int nlen = strlen(name);
17 int len = nlen + 1;
18
19 for (p = path; p; p = p->up) {
20 if (p->elem_len)
21 len += p->elem_len + 1;
22 }
23 n = xmalloc(len);
24 m = n + len - (nlen + 1);
25 strcpy(m, name);
26 for (p = path; p; p = p->up) {
27 if (p->elem_len) {
28 m -= p->elem_len + 1;
29 memcpy(m, p->elem, p->elem_len);
30 m[p->elem_len] = '/';
31 }
32 }
33 return n;
34 }
35
36 void add_object(struct object *obj,
37 struct object_array *p,
38 struct name_path *path,
39 const char *name)
40 {
41 add_object_array(obj, path_name(path, name), p);
42 }
43
44 static void mark_blob_uninteresting(struct blob *blob)
45 {
46 if (blob->object.flags & UNINTERESTING)
47 return;
48 blob->object.flags |= UNINTERESTING;
49 }
50
51 void mark_tree_uninteresting(struct tree *tree)
52 {
53 struct tree_desc desc;
54 struct name_entry entry;
55 struct object *obj = &tree->object;
56
57 if (obj->flags & UNINTERESTING)
58 return;
59 obj->flags |= UNINTERESTING;
60 if (!has_sha1_file(obj->sha1))
61 return;
62 if (parse_tree(tree) < 0)
63 die("bad tree %s", sha1_to_hex(obj->sha1));
64
65 desc.buf = tree->buffer;
66 desc.size = 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
74 /*
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 }
81
82 void mark_parents_uninteresting(struct commit *commit)
83 {
84 struct commit_list *parents = commit->parents;
85
86 while (parents) {
87 struct commit *commit = parents->item;
88 if (!(commit->object.flags & UNINTERESTING)) {
89 commit->object.flags |= UNINTERESTING;
90
91 /*
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
103 /*
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 }
116
117 void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
118 {
119 add_object_array(obj, name, &revs->pending);
120 if (revs->reflog_info && obj->type == OBJ_COMMIT)
121 add_reflog_for_walk(revs->reflog_info,
122 (struct commit *)obj, name);
123 }
124
125 static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
126 {
127 struct object *object;
128
129 object = parse_object(sha1);
130 if (!object)
131 die("bad object %s", name);
132 object->flags |= flags;
133 return object;
134 }
135
136 static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
137 {
138 unsigned long flags = object->flags;
139
140 /*
141 * Tag object? Look what it points to..
142 */
143 while (object->type == OBJ_TAG) {
144 struct tag *tag = (struct tag *) object;
145 if (revs->tag_objects && !(flags & UNINTERESTING))
146 add_pending_object(revs, object, tag->tag);
147 object = parse_object(tag->tagged->sha1);
148 if (!object)
149 die("bad object %s", sha1_to_hex(tag->tagged->sha1));
150 }
151
152 /*
153 * Commit object? Just return it, we'll do all the complex
154 * reachability crud.
155 */
156 if (object->type == OBJ_COMMIT) {
157 struct commit *commit = (struct commit *)object;
158 if (parse_commit(commit) < 0)
159 die("unable to parse commit %s", name);
160 if (flags & UNINTERESTING) {
161 commit->object.flags |= UNINTERESTING;
162 mark_parents_uninteresting(commit);
163 revs->limited = 1;
164 }
165 return commit;
166 }
167
168 /*
169 * Tree object? Either mark it uniniteresting, or add it
170 * to the list of objects to look at later..
171 */
172 if (object->type == OBJ_TREE) {
173 struct tree *tree = (struct tree *)object;
174 if (!revs->tree_objects)
175 return NULL;
176 if (flags & UNINTERESTING) {
177 mark_tree_uninteresting(tree);
178 return NULL;
179 }
180 add_pending_object(revs, object, "");
181 return NULL;
182 }
183
184 /*
185 * Blob object? You know the drill by now..
186 */
187 if (object->type == OBJ_BLOB) {
188 struct blob *blob = (struct blob *)object;
189 if (!revs->blob_objects)
190 return NULL;
191 if (flags & UNINTERESTING) {
192 mark_blob_uninteresting(blob);
193 return NULL;
194 }
195 add_pending_object(revs, object, "");
196 return NULL;
197 }
198 die("%s is unknown object", name);
199 }
200
201 static int everybody_uninteresting(struct commit_list *orig)
202 {
203 struct commit_list *list = orig;
204 while (list) {
205 struct commit *commit = list->item;
206 list = list->next;
207 if (commit->object.flags & UNINTERESTING)
208 continue;
209 return 0;
210 }
211 return 1;
212 }
213
214 static int tree_difference = REV_TREE_SAME;
215
216 static void file_add_remove(struct diff_options *options,
217 int addremove, unsigned mode,
218 const unsigned char *sha1,
219 const char *base, const char *path)
220 {
221 int diff = REV_TREE_DIFFERENT;
222
223 /*
224 * Is it an add of a new file? It means that the old tree
225 * didn't have it at all, so we will turn "REV_TREE_SAME" ->
226 * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
227 * (and if it already was "REV_TREE_NEW", we'll keep it
228 * "REV_TREE_NEW" of course).
229 */
230 if (addremove == '+') {
231 diff = tree_difference;
232 if (diff != REV_TREE_SAME)
233 return;
234 diff = REV_TREE_NEW;
235 }
236 tree_difference = diff;
237 }
238
239 static void file_change(struct diff_options *options,
240 unsigned old_mode, unsigned new_mode,
241 const unsigned char *old_sha1,
242 const unsigned char *new_sha1,
243 const char *base, const char *path)
244 {
245 tree_difference = REV_TREE_DIFFERENT;
246 }
247
248 int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
249 {
250 if (!t1)
251 return REV_TREE_NEW;
252 if (!t2)
253 return REV_TREE_DIFFERENT;
254 tree_difference = REV_TREE_SAME;
255 if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
256 &revs->pruning) < 0)
257 return REV_TREE_DIFFERENT;
258 return tree_difference;
259 }
260
261 int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
262 {
263 int retval;
264 void *tree;
265 struct tree_desc empty, real;
266
267 if (!t1)
268 return 0;
269
270 tree = read_object_with_reference(t1->object.sha1, tree_type, &real.size, NULL);
271 if (!tree)
272 return 0;
273 real.buf = tree;
274
275 empty.buf = "";
276 empty.size = 0;
277
278 tree_difference = 0;
279 retval = diff_tree(&empty, &real, "", &revs->pruning);
280 free(tree);
281
282 return retval >= 0 && !tree_difference;
283 }
284
285 static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
286 {
287 struct commit_list **pp, *parent;
288 int tree_changed = 0, tree_same = 0;
289
290 if (!commit->tree)
291 return;
292
293 if (!commit->parents) {
294 if (!rev_same_tree_as_empty(revs, commit->tree))
295 commit->object.flags |= TREECHANGE;
296 return;
297 }
298
299 pp = &commit->parents;
300 while ((parent = *pp) != NULL) {
301 struct commit *p = parent->item;
302
303 parse_commit(p);
304 switch (rev_compare_tree(revs, p->tree, commit->tree)) {
305 case REV_TREE_SAME:
306 tree_same = 1;
307 if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
308 /* Even if a merge with an uninteresting
309 * side branch brought the entire change
310 * we are interested in, we do not want
311 * to lose the other branches of this
312 * merge, so we just keep going.
313 */
314 pp = &parent->next;
315 continue;
316 }
317 parent->next = NULL;
318 commit->parents = parent;
319 return;
320
321 case REV_TREE_NEW:
322 if (revs->remove_empty_trees &&
323 rev_same_tree_as_empty(revs, p->tree)) {
324 /* We are adding all the specified
325 * paths from this parent, so the
326 * history beyond this parent is not
327 * interesting. Remove its parents
328 * (they are grandparents for us).
329 * IOW, we pretend this parent is a
330 * "root" commit.
331 */
332 parse_commit(p);
333 p->parents = NULL;
334 }
335 /* fallthrough */
336 case REV_TREE_DIFFERENT:
337 tree_changed = 1;
338 pp = &parent->next;
339 continue;
340 }
341 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
342 }
343 if (tree_changed && !tree_same)
344 commit->object.flags |= TREECHANGE;
345 }
346
347 static void add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
348 {
349 struct commit_list *parent = commit->parents;
350 unsigned left_flag;
351
352 if (commit->object.flags & ADDED)
353 return;
354 commit->object.flags |= ADDED;
355
356 /*
357 * If the commit is uninteresting, don't try to
358 * prune parents - we want the maximal uninteresting
359 * set.
360 *
361 * Normally we haven't parsed the parent
362 * yet, so we won't have a parent of a parent
363 * here. However, it may turn out that we've
364 * reached this commit some other way (where it
365 * wasn't uninteresting), in which case we need
366 * to mark its parents recursively too..
367 */
368 if (commit->object.flags & UNINTERESTING) {
369 while (parent) {
370 struct commit *p = parent->item;
371 parent = parent->next;
372 parse_commit(p);
373 p->object.flags |= UNINTERESTING;
374 if (p->parents)
375 mark_parents_uninteresting(p);
376 if (p->object.flags & SEEN)
377 continue;
378 p->object.flags |= SEEN;
379 insert_by_date(p, list);
380 }
381 return;
382 }
383
384 /*
385 * Ok, the commit wasn't uninteresting. Try to
386 * simplify the commit history and find the parent
387 * that has no differences in the path set if one exists.
388 */
389 if (revs->prune_fn)
390 revs->prune_fn(revs, commit);
391
392 if (revs->no_walk)
393 return;
394
395 left_flag = (commit->object.flags & SYMMETRIC_LEFT);
396 parent = commit->parents;
397 while (parent) {
398 struct commit *p = parent->item;
399
400 parent = parent->next;
401
402 parse_commit(p);
403 p->object.flags |= left_flag;
404 if (p->object.flags & SEEN)
405 continue;
406 p->object.flags |= SEEN;
407 insert_by_date(p, list);
408 }
409 }
410
411 static void limit_list(struct rev_info *revs)
412 {
413 struct commit_list *list = revs->commits;
414 struct commit_list *newlist = NULL;
415 struct commit_list **p = &newlist;
416
417 while (list) {
418 struct commit_list *entry = list;
419 struct commit *commit = list->item;
420 struct object *obj = &commit->object;
421
422 list = list->next;
423 free(entry);
424
425 if (revs->max_age != -1 && (commit->date < revs->max_age))
426 obj->flags |= UNINTERESTING;
427 add_parents_to_list(revs, commit, &list);
428 if (obj->flags & UNINTERESTING) {
429 mark_parents_uninteresting(commit);
430 if (everybody_uninteresting(list))
431 break;
432 continue;
433 }
434 if (revs->min_age != -1 && (commit->date > revs->min_age))
435 continue;
436 p = &commit_list_insert(commit, p)->next;
437 }
438 if (revs->boundary) {
439 /* mark the ones that are on the result list first */
440 for (list = newlist; list; list = list->next) {
441 struct commit *commit = list->item;
442 commit->object.flags |= TMP_MARK;
443 }
444 for (list = newlist; list; list = list->next) {
445 struct commit *commit = list->item;
446 struct object *obj = &commit->object;
447 struct commit_list *parent;
448 if (obj->flags & UNINTERESTING)
449 continue;
450 for (parent = commit->parents;
451 parent;
452 parent = parent->next) {
453 struct commit *pcommit = parent->item;
454 if (!(pcommit->object.flags & UNINTERESTING))
455 continue;
456 pcommit->object.flags |= BOUNDARY;
457 if (pcommit->object.flags & TMP_MARK)
458 continue;
459 pcommit->object.flags |= TMP_MARK;
460 p = &commit_list_insert(pcommit, p)->next;
461 }
462 }
463 for (list = newlist; list; list = list->next) {
464 struct commit *commit = list->item;
465 commit->object.flags &= ~TMP_MARK;
466 }
467 }
468 revs->commits = newlist;
469 }
470
471 struct all_refs_cb {
472 int all_flags;
473 int warned_bad_reflog;
474 struct rev_info *all_revs;
475 const char *name_for_errormsg;
476 };
477
478 static int handle_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
479 {
480 struct all_refs_cb *cb = cb_data;
481 struct object *object = get_reference(cb->all_revs, path, sha1,
482 cb->all_flags);
483 add_pending_object(cb->all_revs, object, "");
484 return 0;
485 }
486
487 static void handle_all(struct rev_info *revs, unsigned flags)
488 {
489 struct all_refs_cb cb;
490 cb.all_revs = revs;
491 cb.all_flags = flags;
492 for_each_ref(handle_one_ref, &cb);
493 }
494
495 static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
496 {
497 struct all_refs_cb *cb = cb_data;
498 if (!is_null_sha1(sha1)) {
499 struct object *o = parse_object(sha1);
500 if (o) {
501 o->flags |= cb->all_flags;
502 add_pending_object(cb->all_revs, o, "");
503 }
504 else if (!cb->warned_bad_reflog) {
505 warn("reflog of '%s' references pruned commits",
506 cb->name_for_errormsg);
507 cb->warned_bad_reflog = 1;
508 }
509 }
510 }
511
512 static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
513 const char *email, unsigned long timestamp, int tz,
514 const char *message, void *cb_data)
515 {
516 handle_one_reflog_commit(osha1, cb_data);
517 handle_one_reflog_commit(nsha1, cb_data);
518 return 0;
519 }
520
521 static int handle_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
522 {
523 struct all_refs_cb *cb = cb_data;
524 cb->warned_bad_reflog = 0;
525 cb->name_for_errormsg = path;
526 for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
527 return 0;
528 }
529
530 static void handle_reflog(struct rev_info *revs, unsigned flags)
531 {
532 struct all_refs_cb cb;
533 cb.all_revs = revs;
534 cb.all_flags = flags;
535 for_each_ref(handle_one_reflog, &cb);
536 }
537
538 static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
539 {
540 unsigned char sha1[20];
541 struct object *it;
542 struct commit *commit;
543 struct commit_list *parents;
544
545 if (*arg == '^') {
546 flags ^= UNINTERESTING;
547 arg++;
548 }
549 if (get_sha1(arg, sha1))
550 return 0;
551 while (1) {
552 it = get_reference(revs, arg, sha1, 0);
553 if (it->type != OBJ_TAG)
554 break;
555 hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
556 }
557 if (it->type != OBJ_COMMIT)
558 return 0;
559 commit = (struct commit *)it;
560 for (parents = commit->parents; parents; parents = parents->next) {
561 it = &parents->item->object;
562 it->flags |= flags;
563 add_pending_object(revs, it, arg);
564 }
565 return 1;
566 }
567
568 void init_revisions(struct rev_info *revs, const char *prefix)
569 {
570 memset(revs, 0, sizeof(*revs));
571
572 revs->abbrev = DEFAULT_ABBREV;
573 revs->ignore_merges = 1;
574 revs->simplify_history = 1;
575 revs->pruning.recursive = 1;
576 revs->pruning.add_remove = file_add_remove;
577 revs->pruning.change = file_change;
578 revs->lifo = 1;
579 revs->dense = 1;
580 revs->prefix = prefix;
581 revs->max_age = -1;
582 revs->min_age = -1;
583 revs->skip_count = -1;
584 revs->max_count = -1;
585
586 revs->prune_fn = NULL;
587 revs->prune_data = NULL;
588
589 revs->topo_setter = topo_sort_default_setter;
590 revs->topo_getter = topo_sort_default_getter;
591
592 revs->commit_format = CMIT_FMT_DEFAULT;
593
594 diff_setup(&revs->diffopt);
595 }
596
597 static void add_pending_commit_list(struct rev_info *revs,
598 struct commit_list *commit_list,
599 unsigned int flags)
600 {
601 while (commit_list) {
602 struct object *object = &commit_list->item->object;
603 object->flags |= flags;
604 add_pending_object(revs, object, sha1_to_hex(object->sha1));
605 commit_list = commit_list->next;
606 }
607 }
608
609 static void prepare_show_merge(struct rev_info *revs)
610 {
611 struct commit_list *bases;
612 struct commit *head, *other;
613 unsigned char sha1[20];
614 const char **prune = NULL;
615 int i, prune_num = 1; /* counting terminating NULL */
616
617 if (get_sha1("HEAD", sha1) || !(head = lookup_commit(sha1)))
618 die("--merge without HEAD?");
619 if (get_sha1("MERGE_HEAD", sha1) || !(other = lookup_commit(sha1)))
620 die("--merge without MERGE_HEAD?");
621 add_pending_object(revs, &head->object, "HEAD");
622 add_pending_object(revs, &other->object, "MERGE_HEAD");
623 bases = get_merge_bases(head, other, 1);
624 while (bases) {
625 struct commit *it = bases->item;
626 struct commit_list *n = bases->next;
627 free(bases);
628 bases = n;
629 it->object.flags |= UNINTERESTING;
630 add_pending_object(revs, &it->object, "(merge-base)");
631 }
632
633 if (!active_nr)
634 read_cache();
635 for (i = 0; i < active_nr; i++) {
636 struct cache_entry *ce = active_cache[i];
637 if (!ce_stage(ce))
638 continue;
639 if (ce_path_match(ce, revs->prune_data)) {
640 prune_num++;
641 prune = xrealloc(prune, sizeof(*prune) * prune_num);
642 prune[prune_num-2] = ce->name;
643 prune[prune_num-1] = NULL;
644 }
645 while ((i+1 < active_nr) &&
646 ce_same_name(ce, active_cache[i+1]))
647 i++;
648 }
649 revs->prune_data = prune;
650 }
651
652 int handle_revision_arg(const char *arg, struct rev_info *revs,
653 int flags,
654 int cant_be_filename)
655 {
656 char *dotdot;
657 struct object *object;
658 unsigned char sha1[20];
659 int local_flags;
660
661 dotdot = strstr(arg, "..");
662 if (dotdot) {
663 unsigned char from_sha1[20];
664 const char *next = dotdot + 2;
665 const char *this = arg;
666 int symmetric = *next == '.';
667 unsigned int flags_exclude = flags ^ UNINTERESTING;
668
669 *dotdot = 0;
670 next += symmetric;
671
672 if (!*next)
673 next = "HEAD";
674 if (dotdot == arg)
675 this = "HEAD";
676 if (!get_sha1(this, from_sha1) &&
677 !get_sha1(next, sha1)) {
678 struct commit *a, *b;
679 struct commit_list *exclude;
680
681 a = lookup_commit_reference(from_sha1);
682 b = lookup_commit_reference(sha1);
683 if (!a || !b) {
684 die(symmetric ?
685 "Invalid symmetric difference expression %s...%s" :
686 "Invalid revision range %s..%s",
687 arg, next);
688 }
689
690 if (!cant_be_filename) {
691 *dotdot = '.';
692 verify_non_filename(revs->prefix, arg);
693 }
694
695 if (symmetric) {
696 exclude = get_merge_bases(a, b, 1);
697 add_pending_commit_list(revs, exclude,
698 flags_exclude);
699 free_commit_list(exclude);
700 a->object.flags |= flags | SYMMETRIC_LEFT;
701 } else
702 a->object.flags |= flags_exclude;
703 b->object.flags |= flags;
704 add_pending_object(revs, &a->object, this);
705 add_pending_object(revs, &b->object, next);
706 return 0;
707 }
708 *dotdot = '.';
709 }
710 dotdot = strstr(arg, "^@");
711 if (dotdot && !dotdot[2]) {
712 *dotdot = 0;
713 if (add_parents_only(revs, arg, flags))
714 return 0;
715 *dotdot = '^';
716 }
717 dotdot = strstr(arg, "^!");
718 if (dotdot && !dotdot[2]) {
719 *dotdot = 0;
720 if (!add_parents_only(revs, arg, flags ^ UNINTERESTING))
721 *dotdot = '^';
722 }
723
724 local_flags = 0;
725 if (*arg == '^') {
726 local_flags = UNINTERESTING;
727 arg++;
728 }
729 if (get_sha1(arg, sha1))
730 return -1;
731 if (!cant_be_filename)
732 verify_non_filename(revs->prefix, arg);
733 object = get_reference(revs, arg, sha1, flags ^ local_flags);
734 add_pending_object(revs, object, arg);
735 return 0;
736 }
737
738 static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
739 {
740 if (!revs->grep_filter) {
741 struct grep_opt *opt = xcalloc(1, sizeof(*opt));
742 opt->status_only = 1;
743 opt->pattern_tail = &(opt->pattern_list);
744 opt->regflags = REG_NEWLINE;
745 revs->grep_filter = opt;
746 }
747 append_grep_pattern(revs->grep_filter, ptn,
748 "command line", 0, what);
749 }
750
751 static void add_header_grep(struct rev_info *revs, const char *field, const char *pattern)
752 {
753 char *pat;
754 const char *prefix;
755 int patlen, fldlen;
756
757 fldlen = strlen(field);
758 patlen = strlen(pattern);
759 pat = xmalloc(patlen + fldlen + 10);
760 prefix = ".*";
761 if (*pattern == '^') {
762 prefix = "";
763 pattern++;
764 }
765 sprintf(pat, "^%s %s%s", field, prefix, pattern);
766 add_grep(revs, pat, GREP_PATTERN_HEAD);
767 }
768
769 static void add_message_grep(struct rev_info *revs, const char *pattern)
770 {
771 add_grep(revs, pattern, GREP_PATTERN_BODY);
772 }
773
774 static void add_ignore_packed(struct rev_info *revs, const char *name)
775 {
776 int num = ++revs->num_ignore_packed;
777
778 revs->ignore_packed = xrealloc(revs->ignore_packed,
779 sizeof(const char **) * (num + 1));
780 revs->ignore_packed[num-1] = name;
781 revs->ignore_packed[num] = NULL;
782 }
783
784 /*
785 * Parse revision information, filling in the "rev_info" structure,
786 * and removing the used arguments from the argument list.
787 *
788 * Returns the number of arguments left that weren't recognized
789 * (which are also moved to the head of the argument list)
790 */
791 int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
792 {
793 int i, flags, seen_dashdash, show_merge;
794 const char **unrecognized = argv + 1;
795 int left = 1;
796 int all_match = 0;
797
798 /* First, search for "--" */
799 seen_dashdash = 0;
800 for (i = 1; i < argc; i++) {
801 const char *arg = argv[i];
802 if (strcmp(arg, "--"))
803 continue;
804 argv[i] = NULL;
805 argc = i;
806 revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
807 seen_dashdash = 1;
808 break;
809 }
810
811 flags = show_merge = 0;
812 for (i = 1; i < argc; i++) {
813 const char *arg = argv[i];
814 if (*arg == '-') {
815 int opts;
816 if (!strncmp(arg, "--max-count=", 12)) {
817 revs->max_count = atoi(arg + 12);
818 continue;
819 }
820 if (!strncmp(arg, "--skip=", 7)) {
821 revs->skip_count = atoi(arg + 7);
822 continue;
823 }
824 /* accept -<digit>, like traditional "head" */
825 if ((*arg == '-') && isdigit(arg[1])) {
826 revs->max_count = atoi(arg + 1);
827 continue;
828 }
829 if (!strcmp(arg, "-n")) {
830 if (argc <= i + 1)
831 die("-n requires an argument");
832 revs->max_count = atoi(argv[++i]);
833 continue;
834 }
835 if (!strncmp(arg,"-n",2)) {
836 revs->max_count = atoi(arg + 2);
837 continue;
838 }
839 if (!strncmp(arg, "--max-age=", 10)) {
840 revs->max_age = atoi(arg + 10);
841 continue;
842 }
843 if (!strncmp(arg, "--since=", 8)) {
844 revs->max_age = approxidate(arg + 8);
845 continue;
846 }
847 if (!strncmp(arg, "--after=", 8)) {
848 revs->max_age = approxidate(arg + 8);
849 continue;
850 }
851 if (!strncmp(arg, "--min-age=", 10)) {
852 revs->min_age = atoi(arg + 10);
853 continue;
854 }
855 if (!strncmp(arg, "--before=", 9)) {
856 revs->min_age = approxidate(arg + 9);
857 continue;
858 }
859 if (!strncmp(arg, "--until=", 8)) {
860 revs->min_age = approxidate(arg + 8);
861 continue;
862 }
863 if (!strcmp(arg, "--all")) {
864 handle_all(revs, flags);
865 continue;
866 }
867 if (!strcmp(arg, "--reflog")) {
868 handle_reflog(revs, flags);
869 continue;
870 }
871 if (!strcmp(arg, "--walk-reflogs")) {
872 init_reflog_walk(&revs->reflog_info);
873 continue;
874 }
875 if (!strcmp(arg, "--not")) {
876 flags ^= UNINTERESTING;
877 continue;
878 }
879 if (!strcmp(arg, "--default")) {
880 if (++i >= argc)
881 die("bad --default argument");
882 def = argv[i];
883 continue;
884 }
885 if (!strcmp(arg, "--merge")) {
886 show_merge = 1;
887 continue;
888 }
889 if (!strcmp(arg, "--topo-order")) {
890 revs->topo_order = 1;
891 continue;
892 }
893 if (!strcmp(arg, "--date-order")) {
894 revs->lifo = 0;
895 revs->topo_order = 1;
896 continue;
897 }
898 if (!strcmp(arg, "--parents")) {
899 revs->parents = 1;
900 continue;
901 }
902 if (!strcmp(arg, "--dense")) {
903 revs->dense = 1;
904 continue;
905 }
906 if (!strcmp(arg, "--sparse")) {
907 revs->dense = 0;
908 continue;
909 }
910 if (!strcmp(arg, "--remove-empty")) {
911 revs->remove_empty_trees = 1;
912 continue;
913 }
914 if (!strcmp(arg, "--no-merges")) {
915 revs->no_merges = 1;
916 continue;
917 }
918 if (!strcmp(arg, "--boundary")) {
919 revs->boundary = 1;
920 continue;
921 }
922 if (!strcmp(arg, "--left-right")) {
923 revs->left_right = 1;
924 continue;
925 }
926 if (!strcmp(arg, "--objects")) {
927 revs->tag_objects = 1;
928 revs->tree_objects = 1;
929 revs->blob_objects = 1;
930 continue;
931 }
932 if (!strcmp(arg, "--objects-edge")) {
933 revs->tag_objects = 1;
934 revs->tree_objects = 1;
935 revs->blob_objects = 1;
936 revs->edge_hint = 1;
937 continue;
938 }
939 if (!strcmp(arg, "--unpacked")) {
940 revs->unpacked = 1;
941 free(revs->ignore_packed);
942 revs->ignore_packed = NULL;
943 revs->num_ignore_packed = 0;
944 continue;
945 }
946 if (!strncmp(arg, "--unpacked=", 11)) {
947 revs->unpacked = 1;
948 add_ignore_packed(revs, arg+11);
949 continue;
950 }
951 if (!strcmp(arg, "-r")) {
952 revs->diff = 1;
953 revs->diffopt.recursive = 1;
954 continue;
955 }
956 if (!strcmp(arg, "-t")) {
957 revs->diff = 1;
958 revs->diffopt.recursive = 1;
959 revs->diffopt.tree_in_recursive = 1;
960 continue;
961 }
962 if (!strcmp(arg, "-m")) {
963 revs->ignore_merges = 0;
964 continue;
965 }
966 if (!strcmp(arg, "-c")) {
967 revs->diff = 1;
968 revs->dense_combined_merges = 0;
969 revs->combine_merges = 1;
970 continue;
971 }
972 if (!strcmp(arg, "--cc")) {
973 revs->diff = 1;
974 revs->dense_combined_merges = 1;
975 revs->combine_merges = 1;
976 continue;
977 }
978 if (!strcmp(arg, "-v")) {
979 revs->verbose_header = 1;
980 continue;
981 }
982 if (!strncmp(arg, "--pretty", 8)) {
983 revs->verbose_header = 1;
984 revs->commit_format = get_commit_format(arg+8);
985 continue;
986 }
987 if (!strcmp(arg, "--root")) {
988 revs->show_root_diff = 1;
989 continue;
990 }
991 if (!strcmp(arg, "--no-commit-id")) {
992 revs->no_commit_id = 1;
993 continue;
994 }
995 if (!strcmp(arg, "--always")) {
996 revs->always_show_header = 1;
997 continue;
998 }
999 if (!strcmp(arg, "--no-abbrev")) {
1000 revs->abbrev = 0;
1001 continue;
1002 }
1003 if (!strcmp(arg, "--abbrev")) {
1004 revs->abbrev = DEFAULT_ABBREV;
1005 continue;
1006 }
1007 if (!strncmp(arg, "--abbrev=", 9)) {
1008 revs->abbrev = strtoul(arg + 9, NULL, 10);
1009 if (revs->abbrev < MINIMUM_ABBREV)
1010 revs->abbrev = MINIMUM_ABBREV;
1011 else if (revs->abbrev > 40)
1012 revs->abbrev = 40;
1013 continue;
1014 }
1015 if (!strcmp(arg, "--abbrev-commit")) {
1016 revs->abbrev_commit = 1;
1017 continue;
1018 }
1019 if (!strcmp(arg, "--full-diff")) {
1020 revs->diff = 1;
1021 revs->full_diff = 1;
1022 continue;
1023 }
1024 if (!strcmp(arg, "--full-history")) {
1025 revs->simplify_history = 0;
1026 continue;
1027 }
1028 if (!strcmp(arg, "--relative-date")) {
1029 revs->relative_date = 1;
1030 continue;
1031 }
1032
1033 /*
1034 * Grepping the commit log
1035 */
1036 if (!strncmp(arg, "--author=", 9)) {
1037 add_header_grep(revs, "author", arg+9);
1038 continue;
1039 }
1040 if (!strncmp(arg, "--committer=", 12)) {
1041 add_header_grep(revs, "committer", arg+12);
1042 continue;
1043 }
1044 if (!strncmp(arg, "--grep=", 7)) {
1045 add_message_grep(revs, arg+7);
1046 continue;
1047 }
1048 if (!strcmp(arg, "--all-match")) {
1049 all_match = 1;
1050 continue;
1051 }
1052 if (!strncmp(arg, "--encoding=", 11)) {
1053 arg += 11;
1054 if (strcmp(arg, "none"))
1055 git_log_output_encoding = strdup(arg);
1056 else
1057 git_log_output_encoding = "";
1058 continue;
1059 }
1060
1061 opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
1062 if (opts > 0) {
1063 revs->diff = 1;
1064 i += opts - 1;
1065 continue;
1066 }
1067 *unrecognized++ = arg;
1068 left++;
1069 continue;
1070 }
1071
1072 if (handle_revision_arg(arg, revs, flags, seen_dashdash)) {
1073 int j;
1074 if (seen_dashdash || *arg == '^')
1075 die("bad revision '%s'", arg);
1076
1077 /* If we didn't have a "--":
1078 * (1) all filenames must exist;
1079 * (2) all rev-args must not be interpretable
1080 * as a valid filename.
1081 * but the latter we have checked in the main loop.
1082 */
1083 for (j = i; j < argc; j++)
1084 verify_filename(revs->prefix, argv[j]);
1085
1086 revs->prune_data = get_pathspec(revs->prefix,
1087 argv + i);
1088 break;
1089 }
1090 }
1091
1092 if (show_merge)
1093 prepare_show_merge(revs);
1094 if (def && !revs->pending.nr) {
1095 unsigned char sha1[20];
1096 struct object *object;
1097 if (get_sha1(def, sha1))
1098 die("bad default revision '%s'", def);
1099 object = get_reference(revs, def, sha1, 0);
1100 add_pending_object(revs, object, def);
1101 }
1102
1103 if (revs->topo_order)
1104 revs->limited = 1;
1105
1106 if (revs->prune_data) {
1107 diff_tree_setup_paths(revs->prune_data, &revs->pruning);
1108 revs->prune_fn = try_to_simplify_commit;
1109 if (!revs->full_diff)
1110 diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
1111 }
1112 if (revs->combine_merges) {
1113 revs->ignore_merges = 0;
1114 if (revs->dense_combined_merges && !revs->diffopt.output_format)
1115 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
1116 }
1117 revs->diffopt.abbrev = revs->abbrev;
1118 if (diff_setup_done(&revs->diffopt) < 0)
1119 die("diff_setup_done failed");
1120
1121 if (revs->grep_filter) {
1122 revs->grep_filter->all_match = all_match;
1123 compile_grep_patterns(revs->grep_filter);
1124 }
1125
1126 return left;
1127 }
1128
1129 void prepare_revision_walk(struct rev_info *revs)
1130 {
1131 int nr = revs->pending.nr;
1132 struct object_array_entry *e, *list;
1133
1134 e = list = revs->pending.objects;
1135 revs->pending.nr = 0;
1136 revs->pending.alloc = 0;
1137 revs->pending.objects = NULL;
1138 while (--nr >= 0) {
1139 struct commit *commit = handle_commit(revs, e->item, e->name);
1140 if (commit) {
1141 if (!(commit->object.flags & SEEN)) {
1142 commit->object.flags |= SEEN;
1143 insert_by_date(commit, &revs->commits);
1144 }
1145 }
1146 e++;
1147 }
1148 free(list);
1149
1150 if (revs->no_walk)
1151 return;
1152 if (revs->limited)
1153 limit_list(revs);
1154 if (revs->topo_order)
1155 sort_in_topological_order_fn(&revs->commits, revs->lifo,
1156 revs->topo_setter,
1157 revs->topo_getter);
1158 }
1159
1160 static int rewrite_one(struct rev_info *revs, struct commit **pp)
1161 {
1162 for (;;) {
1163 struct commit *p = *pp;
1164 if (!revs->limited)
1165 add_parents_to_list(revs, p, &revs->commits);
1166 if (p->parents && p->parents->next)
1167 return 0;
1168 if (p->object.flags & (TREECHANGE | UNINTERESTING))
1169 return 0;
1170 if (!p->parents)
1171 return -1;
1172 *pp = p->parents->item;
1173 }
1174 }
1175
1176 static void rewrite_parents(struct rev_info *revs, struct commit *commit)
1177 {
1178 struct commit_list **pp = &commit->parents;
1179 while (*pp) {
1180 struct commit_list *parent = *pp;
1181 if (rewrite_one(revs, &parent->item) < 0) {
1182 *pp = parent->next;
1183 continue;
1184 }
1185 pp = &parent->next;
1186 }
1187 }
1188
1189 static void mark_boundary_to_show(struct commit *commit)
1190 {
1191 struct commit_list *p = commit->parents;
1192 while (p) {
1193 commit = p->item;
1194 p = p->next;
1195 if (commit->object.flags & BOUNDARY)
1196 commit->object.flags |= BOUNDARY_SHOW;
1197 }
1198 }
1199
1200 static int commit_match(struct commit *commit, struct rev_info *opt)
1201 {
1202 if (!opt->grep_filter)
1203 return 1;
1204 return grep_buffer(opt->grep_filter,
1205 NULL, /* we say nothing, not even filename */
1206 commit->buffer, strlen(commit->buffer));
1207 }
1208
1209 static struct commit *get_revision_1(struct rev_info *revs)
1210 {
1211 if (!revs->commits)
1212 return NULL;
1213
1214 do {
1215 struct commit_list *entry = revs->commits;
1216 struct commit *commit = entry->item;
1217
1218 revs->commits = entry->next;
1219 free(entry);
1220
1221 if (revs->reflog_info)
1222 fake_reflog_parent(revs->reflog_info, commit);
1223
1224 /*
1225 * If we haven't done the list limiting, we need to look at
1226 * the parents here. We also need to do the date-based limiting
1227 * that we'd otherwise have done in limit_list().
1228 */
1229 if (!revs->limited) {
1230 if (revs->max_age != -1 &&
1231 (commit->date < revs->max_age))
1232 continue;
1233 add_parents_to_list(revs, commit, &revs->commits);
1234 }
1235 if (commit->object.flags & SHOWN)
1236 continue;
1237
1238 if (revs->unpacked && has_sha1_pack(commit->object.sha1,
1239 revs->ignore_packed))
1240 continue;
1241
1242 /* We want to show boundary commits only when their
1243 * children are shown. When path-limiter is in effect,
1244 * rewrite_parents() drops some commits from getting shown,
1245 * and there is no point showing boundary parents that
1246 * are not shown. After rewrite_parents() rewrites the
1247 * parents of a commit that is shown, we mark the boundary
1248 * parents with BOUNDARY_SHOW.
1249 */
1250 if (commit->object.flags & BOUNDARY_SHOW) {
1251 commit->object.flags |= SHOWN;
1252 return commit;
1253 }
1254 if (commit->object.flags & UNINTERESTING)
1255 continue;
1256 if (revs->min_age != -1 && (commit->date > revs->min_age))
1257 continue;
1258 if (revs->no_merges &&
1259 commit->parents && commit->parents->next)
1260 continue;
1261 if (!commit_match(commit, revs))
1262 continue;
1263 if (revs->prune_fn && revs->dense) {
1264 /* Commit without changes? */
1265 if (!(commit->object.flags & TREECHANGE)) {
1266 /* drop merges unless we want parenthood */
1267 if (!revs->parents)
1268 continue;
1269 /* non-merge - always ignore it */
1270 if (!commit->parents || !commit->parents->next)
1271 continue;
1272 }
1273 if (revs->parents)
1274 rewrite_parents(revs, commit);
1275 }
1276 if (revs->boundary)
1277 mark_boundary_to_show(commit);
1278 commit->object.flags |= SHOWN;
1279 return commit;
1280 } while (revs->commits);
1281 return NULL;
1282 }
1283
1284 struct commit *get_revision(struct rev_info *revs)
1285 {
1286 struct commit *c = NULL;
1287
1288 if (0 < revs->skip_count) {
1289 while ((c = get_revision_1(revs)) != NULL) {
1290 if (revs->skip_count-- <= 0)
1291 break;
1292 }
1293 }
1294
1295 /* Check the max_count ... */
1296 switch (revs->max_count) {
1297 case -1:
1298 break;
1299 case 0:
1300 return NULL;
1301 default:
1302 revs->max_count--;
1303 }
1304 if (c)
1305 return c;
1306 return get_revision_1(revs);
1307 }