Initialize tree descriptors with a helper function rather than by hand.
[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 init_tree_desc(&desc, tree->buffer, tree->size);
66 while (tree_entry(&desc, &entry)) {
67 if (S_ISDIR(entry.mode))
68 mark_tree_uninteresting(lookup_tree(entry.sha1));
69 else
70 mark_blob_uninteresting(lookup_blob(entry.sha1));
71 }
72
73 /*
74 * We don't care about the tree any more
75 * after it has been marked uninteresting.
76 */
77 free(tree->buffer);
78 tree->buffer = NULL;
79 }
80
81 void mark_parents_uninteresting(struct commit *commit)
82 {
83 struct commit_list *parents = commit->parents;
84
85 while (parents) {
86 struct commit *commit = parents->item;
87 if (!(commit->object.flags & UNINTERESTING)) {
88 commit->object.flags |= UNINTERESTING;
89
90 /*
91 * Normally we haven't parsed the parent
92 * yet, so we won't have a parent of a parent
93 * here. However, it may turn out that we've
94 * reached this commit some other way (where it
95 * wasn't uninteresting), in which case we need
96 * to mark its parents recursively too..
97 */
98 if (commit->parents)
99 mark_parents_uninteresting(commit);
100 }
101
102 /*
103 * A missing commit is ok iff its parent is marked
104 * uninteresting.
105 *
106 * We just mark such a thing parsed, so that when
107 * it is popped next time around, we won't be trying
108 * to parse it and get an error.
109 */
110 if (!has_sha1_file(commit->object.sha1))
111 commit->object.parsed = 1;
112 parents = parents->next;
113 }
114 }
115
116 void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
117 {
118 if (revs->no_walk && (obj->flags & UNINTERESTING))
119 die("object ranges do not make sense when not walking revisions");
120 add_object_array(obj, name, &revs->pending);
121 if (revs->reflog_info && obj->type == OBJ_COMMIT)
122 add_reflog_for_walk(revs->reflog_info,
123 (struct commit *)obj, name);
124 }
125
126 static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
127 {
128 struct object *object;
129
130 object = parse_object(sha1);
131 if (!object)
132 die("bad object %s", name);
133 object->flags |= flags;
134 return object;
135 }
136
137 static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
138 {
139 unsigned long flags = object->flags;
140
141 /*
142 * Tag object? Look what it points to..
143 */
144 while (object->type == OBJ_TAG) {
145 struct tag *tag = (struct tag *) object;
146 if (revs->tag_objects && !(flags & UNINTERESTING))
147 add_pending_object(revs, object, tag->tag);
148 object = parse_object(tag->tagged->sha1);
149 if (!object)
150 die("bad object %s", sha1_to_hex(tag->tagged->sha1));
151 }
152
153 /*
154 * Commit object? Just return it, we'll do all the complex
155 * reachability crud.
156 */
157 if (object->type == OBJ_COMMIT) {
158 struct commit *commit = (struct commit *)object;
159 if (parse_commit(commit) < 0)
160 die("unable to parse commit %s", name);
161 if (flags & UNINTERESTING) {
162 commit->object.flags |= UNINTERESTING;
163 mark_parents_uninteresting(commit);
164 revs->limited = 1;
165 }
166 return commit;
167 }
168
169 /*
170 * Tree object? Either mark it uniniteresting, or add it
171 * to the list of objects to look at later..
172 */
173 if (object->type == OBJ_TREE) {
174 struct tree *tree = (struct tree *)object;
175 if (!revs->tree_objects)
176 return NULL;
177 if (flags & UNINTERESTING) {
178 mark_tree_uninteresting(tree);
179 return NULL;
180 }
181 add_pending_object(revs, object, "");
182 return NULL;
183 }
184
185 /*
186 * Blob object? You know the drill by now..
187 */
188 if (object->type == OBJ_BLOB) {
189 struct blob *blob = (struct blob *)object;
190 if (!revs->blob_objects)
191 return NULL;
192 if (flags & UNINTERESTING) {
193 mark_blob_uninteresting(blob);
194 return NULL;
195 }
196 add_pending_object(revs, object, "");
197 return NULL;
198 }
199 die("%s is unknown object", name);
200 }
201
202 static int everybody_uninteresting(struct commit_list *orig)
203 {
204 struct commit_list *list = orig;
205 while (list) {
206 struct commit *commit = list->item;
207 list = list->next;
208 if (commit->object.flags & UNINTERESTING)
209 continue;
210 return 0;
211 }
212 return 1;
213 }
214
215 /*
216 * The goal is to get REV_TREE_NEW as the result only if the
217 * diff consists of all '+' (and no other changes), and
218 * REV_TREE_DIFFERENT otherwise (of course if the trees are
219 * the same we want REV_TREE_SAME). That means that once we
220 * get to REV_TREE_DIFFERENT, we do not have to look any further.
221 */
222 static int tree_difference = REV_TREE_SAME;
223
224 static void file_add_remove(struct diff_options *options,
225 int addremove, unsigned mode,
226 const unsigned char *sha1,
227 const char *base, const char *path)
228 {
229 int diff = REV_TREE_DIFFERENT;
230
231 /*
232 * Is it an add of a new file? It means that the old tree
233 * didn't have it at all, so we will turn "REV_TREE_SAME" ->
234 * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
235 * (and if it already was "REV_TREE_NEW", we'll keep it
236 * "REV_TREE_NEW" of course).
237 */
238 if (addremove == '+') {
239 diff = tree_difference;
240 if (diff != REV_TREE_SAME)
241 return;
242 diff = REV_TREE_NEW;
243 }
244 tree_difference = diff;
245 if (tree_difference == REV_TREE_DIFFERENT)
246 options->has_changes = 1;
247 }
248
249 static void file_change(struct diff_options *options,
250 unsigned old_mode, unsigned new_mode,
251 const unsigned char *old_sha1,
252 const unsigned char *new_sha1,
253 const char *base, const char *path)
254 {
255 tree_difference = REV_TREE_DIFFERENT;
256 options->has_changes = 1;
257 }
258
259 int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
260 {
261 if (!t1)
262 return REV_TREE_NEW;
263 if (!t2)
264 return REV_TREE_DIFFERENT;
265 tree_difference = REV_TREE_SAME;
266 revs->pruning.has_changes = 0;
267 if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
268 &revs->pruning) < 0)
269 return REV_TREE_DIFFERENT;
270 return tree_difference;
271 }
272
273 int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
274 {
275 int retval;
276 void *tree;
277 unsigned long size;
278 struct tree_desc empty, real;
279
280 if (!t1)
281 return 0;
282
283 tree = read_object_with_reference(t1->object.sha1, tree_type, &size, NULL);
284 if (!tree)
285 return 0;
286 init_tree_desc(&real, tree, size);
287 init_tree_desc(&empty, "", 0);
288
289 tree_difference = REV_TREE_SAME;
290 revs->pruning.has_changes = 0;
291 retval = diff_tree(&empty, &real, "", &revs->pruning);
292 free(tree);
293
294 return retval >= 0 && (tree_difference == REV_TREE_SAME);
295 }
296
297 static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
298 {
299 struct commit_list **pp, *parent;
300 int tree_changed = 0, tree_same = 0;
301
302 if (!commit->tree)
303 return;
304
305 if (!commit->parents) {
306 if (!rev_same_tree_as_empty(revs, commit->tree))
307 commit->object.flags |= TREECHANGE;
308 return;
309 }
310
311 pp = &commit->parents;
312 while ((parent = *pp) != NULL) {
313 struct commit *p = parent->item;
314
315 parse_commit(p);
316 switch (rev_compare_tree(revs, p->tree, commit->tree)) {
317 case REV_TREE_SAME:
318 tree_same = 1;
319 if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
320 /* Even if a merge with an uninteresting
321 * side branch brought the entire change
322 * we are interested in, we do not want
323 * to lose the other branches of this
324 * merge, so we just keep going.
325 */
326 pp = &parent->next;
327 continue;
328 }
329 parent->next = NULL;
330 commit->parents = parent;
331 return;
332
333 case REV_TREE_NEW:
334 if (revs->remove_empty_trees &&
335 rev_same_tree_as_empty(revs, p->tree)) {
336 /* We are adding all the specified
337 * paths from this parent, so the
338 * history beyond this parent is not
339 * interesting. Remove its parents
340 * (they are grandparents for us).
341 * IOW, we pretend this parent is a
342 * "root" commit.
343 */
344 parse_commit(p);
345 p->parents = NULL;
346 }
347 /* fallthrough */
348 case REV_TREE_DIFFERENT:
349 tree_changed = 1;
350 pp = &parent->next;
351 continue;
352 }
353 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
354 }
355 if (tree_changed && !tree_same)
356 commit->object.flags |= TREECHANGE;
357 }
358
359 static void add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
360 {
361 struct commit_list *parent = commit->parents;
362 unsigned left_flag;
363
364 if (commit->object.flags & ADDED)
365 return;
366 commit->object.flags |= ADDED;
367
368 /*
369 * If the commit is uninteresting, don't try to
370 * prune parents - we want the maximal uninteresting
371 * set.
372 *
373 * Normally we haven't parsed the parent
374 * yet, so we won't have a parent of a parent
375 * here. However, it may turn out that we've
376 * reached this commit some other way (where it
377 * wasn't uninteresting), in which case we need
378 * to mark its parents recursively too..
379 */
380 if (commit->object.flags & UNINTERESTING) {
381 while (parent) {
382 struct commit *p = parent->item;
383 parent = parent->next;
384 parse_commit(p);
385 p->object.flags |= UNINTERESTING;
386 if (p->parents)
387 mark_parents_uninteresting(p);
388 if (p->object.flags & SEEN)
389 continue;
390 p->object.flags |= SEEN;
391 insert_by_date(p, list);
392 }
393 return;
394 }
395
396 /*
397 * Ok, the commit wasn't uninteresting. Try to
398 * simplify the commit history and find the parent
399 * that has no differences in the path set if one exists.
400 */
401 if (revs->prune_fn)
402 revs->prune_fn(revs, commit);
403
404 if (revs->no_walk)
405 return;
406
407 left_flag = (commit->object.flags & SYMMETRIC_LEFT);
408 parent = commit->parents;
409 while (parent) {
410 struct commit *p = parent->item;
411
412 parent = parent->next;
413
414 parse_commit(p);
415 p->object.flags |= left_flag;
416 if (p->object.flags & SEEN)
417 continue;
418 p->object.flags |= SEEN;
419 insert_by_date(p, list);
420 }
421 }
422
423 static void limit_list(struct rev_info *revs)
424 {
425 struct commit_list *list = revs->commits;
426 struct commit_list *newlist = NULL;
427 struct commit_list **p = &newlist;
428
429 while (list) {
430 struct commit_list *entry = list;
431 struct commit *commit = list->item;
432 struct object *obj = &commit->object;
433
434 list = list->next;
435 free(entry);
436
437 if (revs->max_age != -1 && (commit->date < revs->max_age))
438 obj->flags |= UNINTERESTING;
439 add_parents_to_list(revs, commit, &list);
440 if (obj->flags & UNINTERESTING) {
441 mark_parents_uninteresting(commit);
442 if (everybody_uninteresting(list))
443 break;
444 continue;
445 }
446 if (revs->min_age != -1 && (commit->date > revs->min_age))
447 continue;
448 p = &commit_list_insert(commit, p)->next;
449 }
450 revs->commits = newlist;
451 }
452
453 struct all_refs_cb {
454 int all_flags;
455 int warned_bad_reflog;
456 struct rev_info *all_revs;
457 const char *name_for_errormsg;
458 };
459
460 static int handle_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
461 {
462 struct all_refs_cb *cb = cb_data;
463 struct object *object = get_reference(cb->all_revs, path, sha1,
464 cb->all_flags);
465 add_pending_object(cb->all_revs, object, path);
466 return 0;
467 }
468
469 static void handle_all(struct rev_info *revs, unsigned flags)
470 {
471 struct all_refs_cb cb;
472 cb.all_revs = revs;
473 cb.all_flags = flags;
474 for_each_ref(handle_one_ref, &cb);
475 }
476
477 static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
478 {
479 struct all_refs_cb *cb = cb_data;
480 if (!is_null_sha1(sha1)) {
481 struct object *o = parse_object(sha1);
482 if (o) {
483 o->flags |= cb->all_flags;
484 add_pending_object(cb->all_revs, o, "");
485 }
486 else if (!cb->warned_bad_reflog) {
487 warn("reflog of '%s' references pruned commits",
488 cb->name_for_errormsg);
489 cb->warned_bad_reflog = 1;
490 }
491 }
492 }
493
494 static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
495 const char *email, unsigned long timestamp, int tz,
496 const char *message, void *cb_data)
497 {
498 handle_one_reflog_commit(osha1, cb_data);
499 handle_one_reflog_commit(nsha1, cb_data);
500 return 0;
501 }
502
503 static int handle_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
504 {
505 struct all_refs_cb *cb = cb_data;
506 cb->warned_bad_reflog = 0;
507 cb->name_for_errormsg = path;
508 for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
509 return 0;
510 }
511
512 static void handle_reflog(struct rev_info *revs, unsigned flags)
513 {
514 struct all_refs_cb cb;
515 cb.all_revs = revs;
516 cb.all_flags = flags;
517 for_each_reflog(handle_one_reflog, &cb);
518 }
519
520 static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
521 {
522 unsigned char sha1[20];
523 struct object *it;
524 struct commit *commit;
525 struct commit_list *parents;
526
527 if (*arg == '^') {
528 flags ^= UNINTERESTING;
529 arg++;
530 }
531 if (get_sha1(arg, sha1))
532 return 0;
533 while (1) {
534 it = get_reference(revs, arg, sha1, 0);
535 if (it->type != OBJ_TAG)
536 break;
537 hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
538 }
539 if (it->type != OBJ_COMMIT)
540 return 0;
541 commit = (struct commit *)it;
542 for (parents = commit->parents; parents; parents = parents->next) {
543 it = &parents->item->object;
544 it->flags |= flags;
545 add_pending_object(revs, it, arg);
546 }
547 return 1;
548 }
549
550 void init_revisions(struct rev_info *revs, const char *prefix)
551 {
552 memset(revs, 0, sizeof(*revs));
553
554 revs->abbrev = DEFAULT_ABBREV;
555 revs->ignore_merges = 1;
556 revs->simplify_history = 1;
557 revs->pruning.recursive = 1;
558 revs->pruning.quiet = 1;
559 revs->pruning.add_remove = file_add_remove;
560 revs->pruning.change = file_change;
561 revs->lifo = 1;
562 revs->dense = 1;
563 revs->prefix = prefix;
564 revs->max_age = -1;
565 revs->min_age = -1;
566 revs->skip_count = -1;
567 revs->max_count = -1;
568
569 revs->prune_fn = NULL;
570 revs->prune_data = NULL;
571
572 revs->topo_setter = topo_sort_default_setter;
573 revs->topo_getter = topo_sort_default_getter;
574
575 revs->commit_format = CMIT_FMT_DEFAULT;
576
577 diff_setup(&revs->diffopt);
578 }
579
580 static void add_pending_commit_list(struct rev_info *revs,
581 struct commit_list *commit_list,
582 unsigned int flags)
583 {
584 while (commit_list) {
585 struct object *object = &commit_list->item->object;
586 object->flags |= flags;
587 add_pending_object(revs, object, sha1_to_hex(object->sha1));
588 commit_list = commit_list->next;
589 }
590 }
591
592 static void prepare_show_merge(struct rev_info *revs)
593 {
594 struct commit_list *bases;
595 struct commit *head, *other;
596 unsigned char sha1[20];
597 const char **prune = NULL;
598 int i, prune_num = 1; /* counting terminating NULL */
599
600 if (get_sha1("HEAD", sha1) || !(head = lookup_commit(sha1)))
601 die("--merge without HEAD?");
602 if (get_sha1("MERGE_HEAD", sha1) || !(other = lookup_commit(sha1)))
603 die("--merge without MERGE_HEAD?");
604 add_pending_object(revs, &head->object, "HEAD");
605 add_pending_object(revs, &other->object, "MERGE_HEAD");
606 bases = get_merge_bases(head, other, 1);
607 while (bases) {
608 struct commit *it = bases->item;
609 struct commit_list *n = bases->next;
610 free(bases);
611 bases = n;
612 it->object.flags |= UNINTERESTING;
613 add_pending_object(revs, &it->object, "(merge-base)");
614 }
615
616 if (!active_nr)
617 read_cache();
618 for (i = 0; i < active_nr; i++) {
619 struct cache_entry *ce = active_cache[i];
620 if (!ce_stage(ce))
621 continue;
622 if (ce_path_match(ce, revs->prune_data)) {
623 prune_num++;
624 prune = xrealloc(prune, sizeof(*prune) * prune_num);
625 prune[prune_num-2] = ce->name;
626 prune[prune_num-1] = NULL;
627 }
628 while ((i+1 < active_nr) &&
629 ce_same_name(ce, active_cache[i+1]))
630 i++;
631 }
632 revs->prune_data = prune;
633 }
634
635 int handle_revision_arg(const char *arg, struct rev_info *revs,
636 int flags,
637 int cant_be_filename)
638 {
639 char *dotdot;
640 struct object *object;
641 unsigned char sha1[20];
642 int local_flags;
643
644 dotdot = strstr(arg, "..");
645 if (dotdot) {
646 unsigned char from_sha1[20];
647 const char *next = dotdot + 2;
648 const char *this = arg;
649 int symmetric = *next == '.';
650 unsigned int flags_exclude = flags ^ UNINTERESTING;
651
652 *dotdot = 0;
653 next += symmetric;
654
655 if (!*next)
656 next = "HEAD";
657 if (dotdot == arg)
658 this = "HEAD";
659 if (!get_sha1(this, from_sha1) &&
660 !get_sha1(next, sha1)) {
661 struct commit *a, *b;
662 struct commit_list *exclude;
663
664 a = lookup_commit_reference(from_sha1);
665 b = lookup_commit_reference(sha1);
666 if (!a || !b) {
667 die(symmetric ?
668 "Invalid symmetric difference expression %s...%s" :
669 "Invalid revision range %s..%s",
670 arg, next);
671 }
672
673 if (!cant_be_filename) {
674 *dotdot = '.';
675 verify_non_filename(revs->prefix, arg);
676 }
677
678 if (symmetric) {
679 exclude = get_merge_bases(a, b, 1);
680 add_pending_commit_list(revs, exclude,
681 flags_exclude);
682 free_commit_list(exclude);
683 a->object.flags |= flags | SYMMETRIC_LEFT;
684 } else
685 a->object.flags |= flags_exclude;
686 b->object.flags |= flags;
687 add_pending_object(revs, &a->object, this);
688 add_pending_object(revs, &b->object, next);
689 return 0;
690 }
691 *dotdot = '.';
692 }
693 dotdot = strstr(arg, "^@");
694 if (dotdot && !dotdot[2]) {
695 *dotdot = 0;
696 if (add_parents_only(revs, arg, flags))
697 return 0;
698 *dotdot = '^';
699 }
700 dotdot = strstr(arg, "^!");
701 if (dotdot && !dotdot[2]) {
702 *dotdot = 0;
703 if (!add_parents_only(revs, arg, flags ^ UNINTERESTING))
704 *dotdot = '^';
705 }
706
707 local_flags = 0;
708 if (*arg == '^') {
709 local_flags = UNINTERESTING;
710 arg++;
711 }
712 if (get_sha1(arg, sha1))
713 return -1;
714 if (!cant_be_filename)
715 verify_non_filename(revs->prefix, arg);
716 object = get_reference(revs, arg, sha1, flags ^ local_flags);
717 add_pending_object(revs, object, arg);
718 return 0;
719 }
720
721 static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
722 {
723 if (!revs->grep_filter) {
724 struct grep_opt *opt = xcalloc(1, sizeof(*opt));
725 opt->status_only = 1;
726 opt->pattern_tail = &(opt->pattern_list);
727 opt->regflags = REG_NEWLINE;
728 revs->grep_filter = opt;
729 }
730 append_grep_pattern(revs->grep_filter, ptn,
731 "command line", 0, what);
732 }
733
734 static void add_header_grep(struct rev_info *revs, const char *field, const char *pattern)
735 {
736 char *pat;
737 const char *prefix;
738 int patlen, fldlen;
739
740 fldlen = strlen(field);
741 patlen = strlen(pattern);
742 pat = xmalloc(patlen + fldlen + 10);
743 prefix = ".*";
744 if (*pattern == '^') {
745 prefix = "";
746 pattern++;
747 }
748 sprintf(pat, "^%s %s%s", field, prefix, pattern);
749 add_grep(revs, pat, GREP_PATTERN_HEAD);
750 }
751
752 static void add_message_grep(struct rev_info *revs, const char *pattern)
753 {
754 add_grep(revs, pattern, GREP_PATTERN_BODY);
755 }
756
757 static void add_ignore_packed(struct rev_info *revs, const char *name)
758 {
759 int num = ++revs->num_ignore_packed;
760
761 revs->ignore_packed = xrealloc(revs->ignore_packed,
762 sizeof(const char **) * (num + 1));
763 revs->ignore_packed[num-1] = name;
764 revs->ignore_packed[num] = NULL;
765 }
766
767 /*
768 * Parse revision information, filling in the "rev_info" structure,
769 * and removing the used arguments from the argument list.
770 *
771 * Returns the number of arguments left that weren't recognized
772 * (which are also moved to the head of the argument list)
773 */
774 int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
775 {
776 int i, flags, seen_dashdash, show_merge;
777 const char **unrecognized = argv + 1;
778 int left = 1;
779 int all_match = 0;
780
781 /* First, search for "--" */
782 seen_dashdash = 0;
783 for (i = 1; i < argc; i++) {
784 const char *arg = argv[i];
785 if (strcmp(arg, "--"))
786 continue;
787 argv[i] = NULL;
788 argc = i;
789 revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
790 seen_dashdash = 1;
791 break;
792 }
793
794 flags = show_merge = 0;
795 for (i = 1; i < argc; i++) {
796 const char *arg = argv[i];
797 if (*arg == '-') {
798 int opts;
799 if (!prefixcmp(arg, "--max-count=")) {
800 revs->max_count = atoi(arg + 12);
801 continue;
802 }
803 if (!prefixcmp(arg, "--skip=")) {
804 revs->skip_count = atoi(arg + 7);
805 continue;
806 }
807 /* accept -<digit>, like traditional "head" */
808 if ((*arg == '-') && isdigit(arg[1])) {
809 revs->max_count = atoi(arg + 1);
810 continue;
811 }
812 if (!strcmp(arg, "-n")) {
813 if (argc <= i + 1)
814 die("-n requires an argument");
815 revs->max_count = atoi(argv[++i]);
816 continue;
817 }
818 if (!prefixcmp(arg, "-n")) {
819 revs->max_count = atoi(arg + 2);
820 continue;
821 }
822 if (!prefixcmp(arg, "--max-age=")) {
823 revs->max_age = atoi(arg + 10);
824 continue;
825 }
826 if (!prefixcmp(arg, "--since=")) {
827 revs->max_age = approxidate(arg + 8);
828 continue;
829 }
830 if (!prefixcmp(arg, "--after=")) {
831 revs->max_age = approxidate(arg + 8);
832 continue;
833 }
834 if (!prefixcmp(arg, "--min-age=")) {
835 revs->min_age = atoi(arg + 10);
836 continue;
837 }
838 if (!prefixcmp(arg, "--before=")) {
839 revs->min_age = approxidate(arg + 9);
840 continue;
841 }
842 if (!prefixcmp(arg, "--until=")) {
843 revs->min_age = approxidate(arg + 8);
844 continue;
845 }
846 if (!strcmp(arg, "--all")) {
847 handle_all(revs, flags);
848 continue;
849 }
850 if (!strcmp(arg, "--reflog")) {
851 handle_reflog(revs, flags);
852 continue;
853 }
854 if (!strcmp(arg, "-g") ||
855 !strcmp(arg, "--walk-reflogs")) {
856 init_reflog_walk(&revs->reflog_info);
857 continue;
858 }
859 if (!strcmp(arg, "--not")) {
860 flags ^= UNINTERESTING;
861 continue;
862 }
863 if (!strcmp(arg, "--default")) {
864 if (++i >= argc)
865 die("bad --default argument");
866 def = argv[i];
867 continue;
868 }
869 if (!strcmp(arg, "--merge")) {
870 show_merge = 1;
871 continue;
872 }
873 if (!strcmp(arg, "--topo-order")) {
874 revs->topo_order = 1;
875 continue;
876 }
877 if (!strcmp(arg, "--date-order")) {
878 revs->lifo = 0;
879 revs->topo_order = 1;
880 continue;
881 }
882 if (!strcmp(arg, "--parents")) {
883 revs->parents = 1;
884 continue;
885 }
886 if (!strcmp(arg, "--dense")) {
887 revs->dense = 1;
888 continue;
889 }
890 if (!strcmp(arg, "--sparse")) {
891 revs->dense = 0;
892 continue;
893 }
894 if (!strcmp(arg, "--remove-empty")) {
895 revs->remove_empty_trees = 1;
896 continue;
897 }
898 if (!strcmp(arg, "--no-merges")) {
899 revs->no_merges = 1;
900 continue;
901 }
902 if (!strcmp(arg, "--boundary")) {
903 revs->boundary = 1;
904 continue;
905 }
906 if (!strcmp(arg, "--left-right")) {
907 revs->left_right = 1;
908 continue;
909 }
910 if (!strcmp(arg, "--objects")) {
911 revs->tag_objects = 1;
912 revs->tree_objects = 1;
913 revs->blob_objects = 1;
914 continue;
915 }
916 if (!strcmp(arg, "--objects-edge")) {
917 revs->tag_objects = 1;
918 revs->tree_objects = 1;
919 revs->blob_objects = 1;
920 revs->edge_hint = 1;
921 continue;
922 }
923 if (!strcmp(arg, "--unpacked")) {
924 revs->unpacked = 1;
925 free(revs->ignore_packed);
926 revs->ignore_packed = NULL;
927 revs->num_ignore_packed = 0;
928 continue;
929 }
930 if (!prefixcmp(arg, "--unpacked=")) {
931 revs->unpacked = 1;
932 add_ignore_packed(revs, arg+11);
933 continue;
934 }
935 if (!strcmp(arg, "-r")) {
936 revs->diff = 1;
937 revs->diffopt.recursive = 1;
938 continue;
939 }
940 if (!strcmp(arg, "-t")) {
941 revs->diff = 1;
942 revs->diffopt.recursive = 1;
943 revs->diffopt.tree_in_recursive = 1;
944 continue;
945 }
946 if (!strcmp(arg, "-m")) {
947 revs->ignore_merges = 0;
948 continue;
949 }
950 if (!strcmp(arg, "-c")) {
951 revs->diff = 1;
952 revs->dense_combined_merges = 0;
953 revs->combine_merges = 1;
954 continue;
955 }
956 if (!strcmp(arg, "--cc")) {
957 revs->diff = 1;
958 revs->dense_combined_merges = 1;
959 revs->combine_merges = 1;
960 continue;
961 }
962 if (!strcmp(arg, "-v")) {
963 revs->verbose_header = 1;
964 continue;
965 }
966 if (!prefixcmp(arg, "--pretty")) {
967 revs->verbose_header = 1;
968 revs->commit_format = get_commit_format(arg+8);
969 continue;
970 }
971 if (!strcmp(arg, "--root")) {
972 revs->show_root_diff = 1;
973 continue;
974 }
975 if (!strcmp(arg, "--no-commit-id")) {
976 revs->no_commit_id = 1;
977 continue;
978 }
979 if (!strcmp(arg, "--always")) {
980 revs->always_show_header = 1;
981 continue;
982 }
983 if (!strcmp(arg, "--no-abbrev")) {
984 revs->abbrev = 0;
985 continue;
986 }
987 if (!strcmp(arg, "--abbrev")) {
988 revs->abbrev = DEFAULT_ABBREV;
989 continue;
990 }
991 if (!prefixcmp(arg, "--abbrev=")) {
992 revs->abbrev = strtoul(arg + 9, NULL, 10);
993 if (revs->abbrev < MINIMUM_ABBREV)
994 revs->abbrev = MINIMUM_ABBREV;
995 else if (revs->abbrev > 40)
996 revs->abbrev = 40;
997 continue;
998 }
999 if (!strcmp(arg, "--abbrev-commit")) {
1000 revs->abbrev_commit = 1;
1001 continue;
1002 }
1003 if (!strcmp(arg, "--full-diff")) {
1004 revs->diff = 1;
1005 revs->full_diff = 1;
1006 continue;
1007 }
1008 if (!strcmp(arg, "--full-history")) {
1009 revs->simplify_history = 0;
1010 continue;
1011 }
1012 if (!strcmp(arg, "--relative-date")) {
1013 revs->relative_date = 1;
1014 continue;
1015 }
1016
1017 /*
1018 * Grepping the commit log
1019 */
1020 if (!prefixcmp(arg, "--author=")) {
1021 add_header_grep(revs, "author", arg+9);
1022 continue;
1023 }
1024 if (!prefixcmp(arg, "--committer=")) {
1025 add_header_grep(revs, "committer", arg+12);
1026 continue;
1027 }
1028 if (!prefixcmp(arg, "--grep=")) {
1029 add_message_grep(revs, arg+7);
1030 continue;
1031 }
1032 if (!strcmp(arg, "--all-match")) {
1033 all_match = 1;
1034 continue;
1035 }
1036 if (!prefixcmp(arg, "--encoding=")) {
1037 arg += 11;
1038 if (strcmp(arg, "none"))
1039 git_log_output_encoding = xstrdup(arg);
1040 else
1041 git_log_output_encoding = "";
1042 continue;
1043 }
1044 if (!strcmp(arg, "--reverse")) {
1045 revs->reverse ^= 1;
1046 continue;
1047 }
1048
1049 opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
1050 if (opts > 0) {
1051 revs->diff = 1;
1052 i += opts - 1;
1053 continue;
1054 }
1055 *unrecognized++ = arg;
1056 left++;
1057 continue;
1058 }
1059
1060 if (handle_revision_arg(arg, revs, flags, seen_dashdash)) {
1061 int j;
1062 if (seen_dashdash || *arg == '^')
1063 die("bad revision '%s'", arg);
1064
1065 /* If we didn't have a "--":
1066 * (1) all filenames must exist;
1067 * (2) all rev-args must not be interpretable
1068 * as a valid filename.
1069 * but the latter we have checked in the main loop.
1070 */
1071 for (j = i; j < argc; j++)
1072 verify_filename(revs->prefix, argv[j]);
1073
1074 revs->prune_data = get_pathspec(revs->prefix,
1075 argv + i);
1076 break;
1077 }
1078 }
1079
1080 if (show_merge)
1081 prepare_show_merge(revs);
1082 if (def && !revs->pending.nr) {
1083 unsigned char sha1[20];
1084 struct object *object;
1085 if (get_sha1(def, sha1))
1086 die("bad default revision '%s'", def);
1087 object = get_reference(revs, def, sha1, 0);
1088 add_pending_object(revs, object, def);
1089 }
1090
1091 if (revs->topo_order)
1092 revs->limited = 1;
1093
1094 if (revs->prune_data) {
1095 diff_tree_setup_paths(revs->prune_data, &revs->pruning);
1096 revs->prune_fn = try_to_simplify_commit;
1097 if (!revs->full_diff)
1098 diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
1099 }
1100 if (revs->combine_merges) {
1101 revs->ignore_merges = 0;
1102 if (revs->dense_combined_merges && !revs->diffopt.output_format)
1103 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
1104 }
1105 revs->diffopt.abbrev = revs->abbrev;
1106 if (diff_setup_done(&revs->diffopt) < 0)
1107 die("diff_setup_done failed");
1108
1109 if (revs->grep_filter) {
1110 revs->grep_filter->all_match = all_match;
1111 compile_grep_patterns(revs->grep_filter);
1112 }
1113
1114 return left;
1115 }
1116
1117 void prepare_revision_walk(struct rev_info *revs)
1118 {
1119 int nr = revs->pending.nr;
1120 struct object_array_entry *e, *list;
1121
1122 e = list = revs->pending.objects;
1123 revs->pending.nr = 0;
1124 revs->pending.alloc = 0;
1125 revs->pending.objects = NULL;
1126 while (--nr >= 0) {
1127 struct commit *commit = handle_commit(revs, e->item, e->name);
1128 if (commit) {
1129 if (!(commit->object.flags & SEEN)) {
1130 commit->object.flags |= SEEN;
1131 insert_by_date(commit, &revs->commits);
1132 }
1133 }
1134 e++;
1135 }
1136 free(list);
1137
1138 if (revs->no_walk)
1139 return;
1140 if (revs->limited)
1141 limit_list(revs);
1142 if (revs->topo_order)
1143 sort_in_topological_order_fn(&revs->commits, revs->lifo,
1144 revs->topo_setter,
1145 revs->topo_getter);
1146 }
1147
1148 static int rewrite_one(struct rev_info *revs, struct commit **pp)
1149 {
1150 for (;;) {
1151 struct commit *p = *pp;
1152 if (!revs->limited)
1153 add_parents_to_list(revs, p, &revs->commits);
1154 if (p->parents && p->parents->next)
1155 return 0;
1156 if (p->object.flags & (TREECHANGE | UNINTERESTING))
1157 return 0;
1158 if (!p->parents)
1159 return -1;
1160 *pp = p->parents->item;
1161 }
1162 }
1163
1164 static void rewrite_parents(struct rev_info *revs, struct commit *commit)
1165 {
1166 struct commit_list **pp = &commit->parents;
1167 while (*pp) {
1168 struct commit_list *parent = *pp;
1169 if (rewrite_one(revs, &parent->item) < 0) {
1170 *pp = parent->next;
1171 continue;
1172 }
1173 pp = &parent->next;
1174 }
1175 }
1176
1177 static int commit_match(struct commit *commit, struct rev_info *opt)
1178 {
1179 if (!opt->grep_filter)
1180 return 1;
1181 return grep_buffer(opt->grep_filter,
1182 NULL, /* we say nothing, not even filename */
1183 commit->buffer, strlen(commit->buffer));
1184 }
1185
1186 static struct commit *get_revision_1(struct rev_info *revs)
1187 {
1188 if (!revs->commits)
1189 return NULL;
1190
1191 do {
1192 struct commit_list *entry = revs->commits;
1193 struct commit *commit = entry->item;
1194
1195 revs->commits = entry->next;
1196 free(entry);
1197
1198 if (revs->reflog_info)
1199 fake_reflog_parent(revs->reflog_info, commit);
1200
1201 /*
1202 * If we haven't done the list limiting, we need to look at
1203 * the parents here. We also need to do the date-based limiting
1204 * that we'd otherwise have done in limit_list().
1205 */
1206 if (!revs->limited) {
1207 if (revs->max_age != -1 &&
1208 (commit->date < revs->max_age))
1209 continue;
1210 add_parents_to_list(revs, commit, &revs->commits);
1211 }
1212 if (commit->object.flags & SHOWN)
1213 continue;
1214
1215 if (revs->unpacked && has_sha1_pack(commit->object.sha1,
1216 revs->ignore_packed))
1217 continue;
1218
1219 if (commit->object.flags & UNINTERESTING)
1220 continue;
1221 if (revs->min_age != -1 && (commit->date > revs->min_age))
1222 continue;
1223 if (revs->no_merges &&
1224 commit->parents && commit->parents->next)
1225 continue;
1226 if (!commit_match(commit, revs))
1227 continue;
1228 if (revs->prune_fn && revs->dense) {
1229 /* Commit without changes? */
1230 if (!(commit->object.flags & TREECHANGE)) {
1231 /* drop merges unless we want parenthood */
1232 if (!revs->parents)
1233 continue;
1234 /* non-merge - always ignore it */
1235 if (!commit->parents || !commit->parents->next)
1236 continue;
1237 }
1238 if (revs->parents)
1239 rewrite_parents(revs, commit);
1240 }
1241 return commit;
1242 } while (revs->commits);
1243 return NULL;
1244 }
1245
1246 static void gc_boundary(struct object_array *array)
1247 {
1248 unsigned nr = array->nr;
1249 unsigned alloc = array->alloc;
1250 struct object_array_entry *objects = array->objects;
1251
1252 if (alloc <= nr) {
1253 unsigned i, j;
1254 for (i = j = 0; i < nr; i++) {
1255 if (objects[i].item->flags & SHOWN)
1256 continue;
1257 if (i != j)
1258 objects[j] = objects[i];
1259 j++;
1260 }
1261 for (i = j; i < nr; i++)
1262 objects[i].item = NULL;
1263 array->nr = j;
1264 }
1265 }
1266
1267 struct commit *get_revision(struct rev_info *revs)
1268 {
1269 struct commit *c = NULL;
1270 struct commit_list *l;
1271
1272 if (revs->boundary == 2) {
1273 unsigned i;
1274 struct object_array *array = &revs->boundary_commits;
1275 struct object_array_entry *objects = array->objects;
1276 for (i = 0; i < array->nr; i++) {
1277 c = (struct commit *)(objects[i].item);
1278 if (!c)
1279 continue;
1280 if (!(c->object.flags & CHILD_SHOWN))
1281 continue;
1282 if (!(c->object.flags & SHOWN))
1283 break;
1284 }
1285 if (array->nr <= i)
1286 return NULL;
1287
1288 c->object.flags |= SHOWN | BOUNDARY;
1289 return c;
1290 }
1291
1292 if (revs->reverse) {
1293 int limit = -1;
1294
1295 if (0 <= revs->max_count) {
1296 limit = revs->max_count;
1297 if (0 < revs->skip_count)
1298 limit += revs->skip_count;
1299 }
1300 l = NULL;
1301 while ((c = get_revision_1(revs))) {
1302 commit_list_insert(c, &l);
1303 if ((0 < limit) && !--limit)
1304 break;
1305 }
1306 revs->commits = l;
1307 revs->reverse = 0;
1308 revs->max_count = -1;
1309 c = NULL;
1310 }
1311
1312 /*
1313 * Now pick up what they want to give us
1314 */
1315 c = get_revision_1(revs);
1316 if (c) {
1317 while (0 < revs->skip_count) {
1318 revs->skip_count--;
1319 c = get_revision_1(revs);
1320 if (!c)
1321 break;
1322 }
1323 }
1324
1325 /*
1326 * Check the max_count.
1327 */
1328 switch (revs->max_count) {
1329 case -1:
1330 break;
1331 case 0:
1332 c = NULL;
1333 break;
1334 default:
1335 revs->max_count--;
1336 }
1337
1338 if (c)
1339 c->object.flags |= SHOWN;
1340
1341 if (!revs->boundary) {
1342 return c;
1343 }
1344
1345 if (!c) {
1346 /*
1347 * get_revision_1() runs out the commits, and
1348 * we are done computing the boundaries.
1349 * switch to boundary commits output mode.
1350 */
1351 revs->boundary = 2;
1352 return get_revision(revs);
1353 }
1354
1355 /*
1356 * boundary commits are the commits that are parents of the
1357 * ones we got from get_revision_1() but they themselves are
1358 * not returned from get_revision_1(). Before returning
1359 * 'c', we need to mark its parents that they could be boundaries.
1360 */
1361
1362 for (l = c->parents; l; l = l->next) {
1363 struct object *p;
1364 p = &(l->item->object);
1365 if (p->flags & (CHILD_SHOWN | SHOWN))
1366 continue;
1367 p->flags |= CHILD_SHOWN;
1368 gc_boundary(&revs->boundary_commits);
1369 add_object_array(p, NULL, &revs->boundary_commits);
1370 }
1371
1372 return c;
1373 }