git-apply --whitespace=fix: fix off by one thinko
[git/git.git] / revision.c
CommitLineData
ae563542
LT
1#include "cache.h"
2#include "tag.h"
3#include "blob.h"
4#include "tree.h"
5#include "commit.h"
a4a88b2b 6#include "diff.h"
ae563542
LT
7#include "refs.h"
8#include "revision.h"
8ecae9b0 9#include "grep.h"
8860fd42 10#include "reflog-walk.h"
d7a17cad 11#include "patch-ids.h"
ae563542 12
cdcefbc9
LT
13volatile show_early_output_fn_t show_early_output;
14
ae563542
LT
15static char *path_name(struct name_path *path, const char *name)
16{
17 struct name_path *p;
18 char *n, *m;
19 int nlen = strlen(name);
20 int len = nlen + 1;
21
22 for (p = path; p; p = p->up) {
23 if (p->elem_len)
24 len += p->elem_len + 1;
25 }
26 n = xmalloc(len);
27 m = n + len - (nlen + 1);
28 strcpy(m, name);
29 for (p = path; p; p = p->up) {
30 if (p->elem_len) {
31 m -= p->elem_len + 1;
32 memcpy(m, p->elem, p->elem_len);
33 m[p->elem_len] = '/';
34 }
35 }
36 return n;
37}
38
1f1e895f
LT
39void add_object(struct object *obj,
40 struct object_array *p,
41 struct name_path *path,
42 const char *name)
ae563542 43{
1f1e895f 44 add_object_array(obj, path_name(path, name), p);
ae563542
LT
45}
46
47static void mark_blob_uninteresting(struct blob *blob)
48{
c1ee9013
MK
49 if (!blob)
50 return;
ae563542
LT
51 if (blob->object.flags & UNINTERESTING)
52 return;
53 blob->object.flags |= UNINTERESTING;
54}
55
56void mark_tree_uninteresting(struct tree *tree)
57{
f75e53ed 58 struct tree_desc desc;
4c068a98 59 struct name_entry entry;
ae563542 60 struct object *obj = &tree->object;
ae563542 61
c1ee9013
MK
62 if (!tree)
63 return;
ae563542
LT
64 if (obj->flags & UNINTERESTING)
65 return;
66 obj->flags |= UNINTERESTING;
67 if (!has_sha1_file(obj->sha1))
68 return;
69 if (parse_tree(tree) < 0)
70 die("bad tree %s", sha1_to_hex(obj->sha1));
f75e53ed 71
6fda5e51 72 init_tree_desc(&desc, tree->buffer, tree->size);
4c068a98 73 while (tree_entry(&desc, &entry)) {
4d1012c3
LT
74 switch (object_type(entry.mode)) {
75 case OBJ_TREE:
4c068a98 76 mark_tree_uninteresting(lookup_tree(entry.sha1));
4d1012c3
LT
77 break;
78 case OBJ_BLOB:
4c068a98 79 mark_blob_uninteresting(lookup_blob(entry.sha1));
4d1012c3
LT
80 break;
81 default:
82 /* Subproject commit - not in this repository */
83 break;
84 }
ae563542 85 }
f75e53ed
LT
86
87 /*
88 * We don't care about the tree any more
89 * after it has been marked uninteresting.
90 */
91 free(tree->buffer);
92 tree->buffer = NULL;
ae563542
LT
93}
94
95void mark_parents_uninteresting(struct commit *commit)
96{
97 struct commit_list *parents = commit->parents;
98
99 while (parents) {
100 struct commit *commit = parents->item;
d2c4af73
MU
101 if (!(commit->object.flags & UNINTERESTING)) {
102 commit->object.flags |= UNINTERESTING;
ae563542 103
d2c4af73
MU
104 /*
105 * Normally we haven't parsed the parent
106 * yet, so we won't have a parent of a parent
107 * here. However, it may turn out that we've
108 * reached this commit some other way (where it
109 * wasn't uninteresting), in which case we need
110 * to mark its parents recursively too..
111 */
112 if (commit->parents)
113 mark_parents_uninteresting(commit);
114 }
ae563542
LT
115
116 /*
117 * A missing commit is ok iff its parent is marked
118 * uninteresting.
119 *
120 * We just mark such a thing parsed, so that when
121 * it is popped next time around, we won't be trying
122 * to parse it and get an error.
123 */
124 if (!has_sha1_file(commit->object.sha1))
125 commit->object.parsed = 1;
126 parents = parents->next;
127 }
128}
129
2d93b9fa 130static void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode)
ae563542 131{
aa27e461
LT
132 if (revs->no_walk && (obj->flags & UNINTERESTING))
133 die("object ranges do not make sense when not walking revisions");
7b69b873
JS
134 if (revs->reflog_info && obj->type == OBJ_COMMIT &&
135 add_reflog_for_walk(revs->reflog_info,
136 (struct commit *)obj, name))
137 return;
bb6c2fba 138 add_object_array_with_mode(obj, name, &revs->pending, mode);
ae563542
LT
139}
140
2d93b9fa
JH
141void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
142{
143 add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
144}
145
3384a2df
JH
146void add_head_to_pending(struct rev_info *revs)
147{
148 unsigned char sha1[20];
149 struct object *obj;
150 if (get_sha1("HEAD", sha1))
151 return;
152 obj = parse_object(sha1);
153 if (!obj)
154 return;
155 add_pending_object(revs, obj, "HEAD");
156}
157
cd2bdc53 158static struct object *get_reference(struct rev_info *revs, const char *name, const unsigned char *sha1, unsigned int flags)
ae563542
LT
159{
160 struct object *object;
161
162 object = parse_object(sha1);
163 if (!object)
164 die("bad object %s", name);
cd2bdc53
LT
165 object->flags |= flags;
166 return object;
167}
168
169static struct commit *handle_commit(struct rev_info *revs, struct object *object, const char *name)
170{
171 unsigned long flags = object->flags;
ae563542
LT
172
173 /*
174 * Tag object? Look what it points to..
175 */
1974632c 176 while (object->type == OBJ_TAG) {
ae563542 177 struct tag *tag = (struct tag *) object;
cd2bdc53 178 if (revs->tag_objects && !(flags & UNINTERESTING))
ae563542 179 add_pending_object(revs, object, tag->tag);
9684afd9
MK
180 if (!tag->tagged)
181 die("bad tag");
ae563542
LT
182 object = parse_object(tag->tagged->sha1);
183 if (!object)
184 die("bad object %s", sha1_to_hex(tag->tagged->sha1));
185 }
186
187 /*
188 * Commit object? Just return it, we'll do all the complex
189 * reachability crud.
190 */
1974632c 191 if (object->type == OBJ_COMMIT) {
ae563542 192 struct commit *commit = (struct commit *)object;
ae563542
LT
193 if (parse_commit(commit) < 0)
194 die("unable to parse commit %s", name);
d9a83684 195 if (flags & UNINTERESTING) {
4262c1b0 196 commit->object.flags |= UNINTERESTING;
ae563542 197 mark_parents_uninteresting(commit);
d9a83684
LT
198 revs->limited = 1;
199 }
ae563542
LT
200 return commit;
201 }
202
203 /*
204 * Tree object? Either mark it uniniteresting, or add it
205 * to the list of objects to look at later..
206 */
1974632c 207 if (object->type == OBJ_TREE) {
ae563542
LT
208 struct tree *tree = (struct tree *)object;
209 if (!revs->tree_objects)
210 return NULL;
211 if (flags & UNINTERESTING) {
212 mark_tree_uninteresting(tree);
213 return NULL;
214 }
215 add_pending_object(revs, object, "");
216 return NULL;
217 }
218
219 /*
220 * Blob object? You know the drill by now..
221 */
1974632c 222 if (object->type == OBJ_BLOB) {
ae563542
LT
223 struct blob *blob = (struct blob *)object;
224 if (!revs->blob_objects)
225 return NULL;
226 if (flags & UNINTERESTING) {
227 mark_blob_uninteresting(blob);
228 return NULL;
229 }
230 add_pending_object(revs, object, "");
231 return NULL;
232 }
233 die("%s is unknown object", name);
234}
235
a4a88b2b
LT
236static int everybody_uninteresting(struct commit_list *orig)
237{
238 struct commit_list *list = orig;
239 while (list) {
240 struct commit *commit = list->item;
241 list = list->next;
242 if (commit->object.flags & UNINTERESTING)
243 continue;
244 return 0;
245 }
246 return 1;
247}
248
0a4ba7f8
JH
249/*
250 * The goal is to get REV_TREE_NEW as the result only if the
251 * diff consists of all '+' (and no other changes), and
252 * REV_TREE_DIFFERENT otherwise (of course if the trees are
253 * the same we want REV_TREE_SAME). That means that once we
254 * get to REV_TREE_DIFFERENT, we do not have to look any further.
255 */
8efdc326 256static int tree_difference = REV_TREE_SAME;
a4a88b2b
LT
257
258static void file_add_remove(struct diff_options *options,
259 int addremove, unsigned mode,
260 const unsigned char *sha1,
261 const char *base, const char *path)
262{
8efdc326 263 int diff = REV_TREE_DIFFERENT;
a4a88b2b
LT
264
265 /*
8efdc326
FK
266 * Is it an add of a new file? It means that the old tree
267 * didn't have it at all, so we will turn "REV_TREE_SAME" ->
268 * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
269 * (and if it already was "REV_TREE_NEW", we'll keep it
270 * "REV_TREE_NEW" of course).
a4a88b2b
LT
271 */
272 if (addremove == '+') {
273 diff = tree_difference;
8efdc326 274 if (diff != REV_TREE_SAME)
a4a88b2b 275 return;
8efdc326 276 diff = REV_TREE_NEW;
a4a88b2b
LT
277 }
278 tree_difference = diff;
dd47aa31 279 if (tree_difference == REV_TREE_DIFFERENT)
8f67f8ae 280 DIFF_OPT_SET(options, HAS_CHANGES);
a4a88b2b
LT
281}
282
283static void file_change(struct diff_options *options,
284 unsigned old_mode, unsigned new_mode,
285 const unsigned char *old_sha1,
286 const unsigned char *new_sha1,
287 const char *base, const char *path)
288{
8efdc326 289 tree_difference = REV_TREE_DIFFERENT;
8f67f8ae 290 DIFF_OPT_SET(options, HAS_CHANGES);
a4a88b2b
LT
291}
292
2d93b9fa 293static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
a4a88b2b
LT
294{
295 if (!t1)
8efdc326 296 return REV_TREE_NEW;
a4a88b2b 297 if (!t2)
8efdc326
FK
298 return REV_TREE_DIFFERENT;
299 tree_difference = REV_TREE_SAME;
8f67f8ae 300 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
c4e05b1a 301 if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
cd2bdc53 302 &revs->pruning) < 0)
8efdc326 303 return REV_TREE_DIFFERENT;
a4a88b2b
LT
304 return tree_difference;
305}
306
2d93b9fa 307static int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
a4a88b2b
LT
308{
309 int retval;
310 void *tree;
6fda5e51 311 unsigned long size;
a4a88b2b
LT
312 struct tree_desc empty, real;
313
314 if (!t1)
315 return 0;
316
6fda5e51 317 tree = read_object_with_reference(t1->object.sha1, tree_type, &size, NULL);
a4a88b2b
LT
318 if (!tree)
319 return 0;
6fda5e51
LT
320 init_tree_desc(&real, tree, size);
321 init_tree_desc(&empty, "", 0);
a4a88b2b 322
0a4ba7f8 323 tree_difference = REV_TREE_SAME;
8f67f8ae 324 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
cd2bdc53 325 retval = diff_tree(&empty, &real, "", &revs->pruning);
a4a88b2b
LT
326 free(tree);
327
0a4ba7f8 328 return retval >= 0 && (tree_difference == REV_TREE_SAME);
a4a88b2b
LT
329}
330
331static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
332{
333 struct commit_list **pp, *parent;
6631c736 334 int tree_changed = 0, tree_same = 0;
a4a88b2b 335
53b2c823
LT
336 /*
337 * If we don't do pruning, everything is interesting
338 */
7dc0fe3b 339 if (!revs->prune)
53b2c823 340 return;
53b2c823 341
a4a88b2b
LT
342 if (!commit->tree)
343 return;
344
345 if (!commit->parents) {
7dc0fe3b
LT
346 if (rev_same_tree_as_empty(revs, commit->tree))
347 commit->object.flags |= TREESAME;
a4a88b2b
LT
348 return;
349 }
350
53b2c823
LT
351 /*
352 * Normal non-merge commit? If we don't want to make the
353 * history dense, we consider it always to be a change..
354 */
7dc0fe3b 355 if (!revs->dense && !commit->parents->next)
53b2c823 356 return;
53b2c823 357
a4a88b2b
LT
358 pp = &commit->parents;
359 while ((parent = *pp) != NULL) {
360 struct commit *p = parent->item;
361
cc0e6c5a
AR
362 if (parse_commit(p) < 0)
363 die("cannot simplify commit %s (because of %s)",
364 sha1_to_hex(commit->object.sha1),
365 sha1_to_hex(p->object.sha1));
c4e05b1a 366 switch (rev_compare_tree(revs, p->tree, commit->tree)) {
8efdc326 367 case REV_TREE_SAME:
6631c736 368 tree_same = 1;
9202434c 369 if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
f3219fbb
JH
370 /* Even if a merge with an uninteresting
371 * side branch brought the entire change
372 * we are interested in, we do not want
373 * to lose the other branches of this
374 * merge, so we just keep going.
375 */
376 pp = &parent->next;
377 continue;
378 }
a4a88b2b
LT
379 parent->next = NULL;
380 commit->parents = parent;
7dc0fe3b 381 commit->object.flags |= TREESAME;
a4a88b2b
LT
382 return;
383
8efdc326
FK
384 case REV_TREE_NEW:
385 if (revs->remove_empty_trees &&
c4e05b1a 386 rev_same_tree_as_empty(revs, p->tree)) {
c348f31a
JH
387 /* We are adding all the specified
388 * paths from this parent, so the
389 * history beyond this parent is not
390 * interesting. Remove its parents
391 * (they are grandparents for us).
392 * IOW, we pretend this parent is a
393 * "root" commit.
a41e109c 394 */
cc0e6c5a
AR
395 if (parse_commit(p) < 0)
396 die("cannot simplify commit %s (invalid %s)",
397 sha1_to_hex(commit->object.sha1),
398 sha1_to_hex(p->object.sha1));
c348f31a 399 p->parents = NULL;
a4a88b2b
LT
400 }
401 /* fallthrough */
8efdc326 402 case REV_TREE_DIFFERENT:
f3219fbb 403 tree_changed = 1;
a4a88b2b
LT
404 pp = &parent->next;
405 continue;
406 }
407 die("bad tree compare for commit %s", sha1_to_hex(commit->object.sha1));
408 }
6631c736 409 if (tree_changed && !tree_same)
7dc0fe3b
LT
410 return;
411 commit->object.flags |= TREESAME;
a4a88b2b
LT
412}
413
cc0e6c5a 414static int add_parents_to_list(struct rev_info *revs, struct commit *commit, struct commit_list **list)
a4a88b2b
LT
415{
416 struct commit_list *parent = commit->parents;
577ed5c2 417 unsigned left_flag;
0053e902 418 int add, rest;
a4a88b2b 419
3381c790 420 if (commit->object.flags & ADDED)
cc0e6c5a 421 return 0;
3381c790
LT
422 commit->object.flags |= ADDED;
423
a4a88b2b
LT
424 /*
425 * If the commit is uninteresting, don't try to
426 * prune parents - we want the maximal uninteresting
427 * set.
428 *
429 * Normally we haven't parsed the parent
430 * yet, so we won't have a parent of a parent
431 * here. However, it may turn out that we've
432 * reached this commit some other way (where it
433 * wasn't uninteresting), in which case we need
434 * to mark its parents recursively too..
435 */
436 if (commit->object.flags & UNINTERESTING) {
437 while (parent) {
438 struct commit *p = parent->item;
439 parent = parent->next;
cc0e6c5a
AR
440 if (parse_commit(p) < 0)
441 return -1;
a4a88b2b
LT
442 p->object.flags |= UNINTERESTING;
443 if (p->parents)
444 mark_parents_uninteresting(p);
445 if (p->object.flags & SEEN)
446 continue;
447 p->object.flags |= SEEN;
448 insert_by_date(p, list);
449 }
cc0e6c5a 450 return 0;
a4a88b2b
LT
451 }
452
453 /*
454 * Ok, the commit wasn't uninteresting. Try to
455 * simplify the commit history and find the parent
456 * that has no differences in the path set if one exists.
457 */
53b2c823 458 try_to_simplify_commit(revs, commit);
a4a88b2b 459
ba1d4505 460 if (revs->no_walk)
cc0e6c5a 461 return 0;
ba1d4505 462
577ed5c2 463 left_flag = (commit->object.flags & SYMMETRIC_LEFT);
0053e902
JH
464
465 rest = !revs->first_parent_only;
466 for (parent = commit->parents, add = 1; parent; add = rest) {
a4a88b2b
LT
467 struct commit *p = parent->item;
468
469 parent = parent->next;
cc0e6c5a
AR
470 if (parse_commit(p) < 0)
471 return -1;
577ed5c2 472 p->object.flags |= left_flag;
a4a88b2b
LT
473 if (p->object.flags & SEEN)
474 continue;
475 p->object.flags |= SEEN;
0053e902
JH
476 if (add)
477 insert_by_date(p, list);
a4a88b2b 478 }
cc0e6c5a 479 return 0;
a4a88b2b
LT
480}
481
36d56de6 482static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
d7a17cad
JH
483{
484 struct commit_list *p;
485 int left_count = 0, right_count = 0;
486 int left_first;
487 struct patch_ids ids;
488
489 /* First count the commits on the left and on the right */
490 for (p = list; p; p = p->next) {
491 struct commit *commit = p->item;
492 unsigned flags = commit->object.flags;
493 if (flags & BOUNDARY)
494 ;
495 else if (flags & SYMMETRIC_LEFT)
496 left_count++;
497 else
498 right_count++;
499 }
500
501 left_first = left_count < right_count;
502 init_patch_ids(&ids);
36d56de6
JS
503 if (revs->diffopt.nr_paths) {
504 ids.diffopts.nr_paths = revs->diffopt.nr_paths;
505 ids.diffopts.paths = revs->diffopt.paths;
506 ids.diffopts.pathlens = revs->diffopt.pathlens;
507 }
d7a17cad
JH
508
509 /* Compute patch-ids for one side */
510 for (p = list; p; p = p->next) {
511 struct commit *commit = p->item;
512 unsigned flags = commit->object.flags;
513
514 if (flags & BOUNDARY)
515 continue;
516 /*
517 * If we have fewer left, left_first is set and we omit
518 * commits on the right branch in this loop. If we have
519 * fewer right, we skip the left ones.
520 */
521 if (left_first != !!(flags & SYMMETRIC_LEFT))
522 continue;
523 commit->util = add_commit_patch_id(commit, &ids);
524 }
525
526 /* Check the other side */
527 for (p = list; p; p = p->next) {
528 struct commit *commit = p->item;
529 struct patch_id *id;
530 unsigned flags = commit->object.flags;
531
532 if (flags & BOUNDARY)
533 continue;
534 /*
535 * If we have fewer left, left_first is set and we omit
536 * commits on the left branch in this loop.
537 */
538 if (left_first == !!(flags & SYMMETRIC_LEFT))
539 continue;
540
541 /*
542 * Have we seen the same patch id?
543 */
544 id = has_commit_patch_id(commit, &ids);
545 if (!id)
546 continue;
547 id->seen = 1;
548 commit->object.flags |= SHOWN;
549 }
550
551 /* Now check the original side for seen ones */
552 for (p = list; p; p = p->next) {
553 struct commit *commit = p->item;
554 struct patch_id *ent;
555
556 ent = commit->util;
557 if (!ent)
558 continue;
559 if (ent->seen)
560 commit->object.flags |= SHOWN;
561 commit->util = NULL;
562 }
563
564 free_patch_ids(&ids);
565}
566
3131b713
LT
567static void add_to_list(struct commit_list **p, struct commit *commit, struct commit_list *n)
568{
569 p = &commit_list_insert(commit, p)->next;
570 *p = n;
571}
572
cc0e6c5a 573static int limit_list(struct rev_info *revs)
a4a88b2b
LT
574{
575 struct commit_list *list = revs->commits;
576 struct commit_list *newlist = NULL;
577 struct commit_list **p = &newlist;
578
579 while (list) {
580 struct commit_list *entry = list;
581 struct commit *commit = list->item;
582 struct object *obj = &commit->object;
cdcefbc9 583 show_early_output_fn_t show;
a4a88b2b
LT
584
585 list = list->next;
586 free(entry);
587
588 if (revs->max_age != -1 && (commit->date < revs->max_age))
589 obj->flags |= UNINTERESTING;
cc0e6c5a
AR
590 if (add_parents_to_list(revs, commit, &list) < 0)
591 return -1;
a4a88b2b
LT
592 if (obj->flags & UNINTERESTING) {
593 mark_parents_uninteresting(commit);
3131b713
LT
594 if (everybody_uninteresting(list)) {
595 if (revs->show_all)
596 add_to_list(p, commit, list);
a4a88b2b 597 break;
3131b713
LT
598 }
599 if (!revs->show_all)
600 continue;
a4a88b2b
LT
601 }
602 if (revs->min_age != -1 && (commit->date > revs->min_age))
603 continue;
604 p = &commit_list_insert(commit, p)->next;
cdcefbc9
LT
605
606 show = show_early_output;
607 if (!show)
608 continue;
609
610 show(revs, newlist);
611 show_early_output = NULL;
a4a88b2b 612 }
d7a17cad 613 if (revs->cherry_pick)
36d56de6 614 cherry_pick_list(newlist, revs);
d7a17cad 615
a4a88b2b 616 revs->commits = newlist;
cc0e6c5a 617 return 0;
a4a88b2b
LT
618}
619
63049292
JH
620struct all_refs_cb {
621 int all_flags;
71b03b42 622 int warned_bad_reflog;
63049292
JH
623 struct rev_info *all_revs;
624 const char *name_for_errormsg;
625};
ae563542 626
8da19775 627static int handle_one_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
ae563542 628{
63049292
JH
629 struct all_refs_cb *cb = cb_data;
630 struct object *object = get_reference(cb->all_revs, path, sha1,
631 cb->all_flags);
3d1efd8f 632 add_pending_object(cb->all_revs, object, path);
ae563542
LT
633 return 0;
634}
635
636static void handle_all(struct rev_info *revs, unsigned flags)
637{
63049292
JH
638 struct all_refs_cb cb;
639 cb.all_revs = revs;
640 cb.all_flags = flags;
641 for_each_ref(handle_one_ref, &cb);
642}
643
71b03b42 644static void handle_one_reflog_commit(unsigned char *sha1, void *cb_data)
63049292
JH
645{
646 struct all_refs_cb *cb = cb_data;
71b03b42
SP
647 if (!is_null_sha1(sha1)) {
648 struct object *o = parse_object(sha1);
649 if (o) {
650 o->flags |= cb->all_flags;
651 add_pending_object(cb->all_revs, o, "");
652 }
653 else if (!cb->warned_bad_reflog) {
46efd2d9 654 warning("reflog of '%s' references pruned commits",
71b03b42
SP
655 cb->name_for_errormsg);
656 cb->warned_bad_reflog = 1;
657 }
63049292 658 }
71b03b42
SP
659}
660
883d60fa
JS
661static int handle_one_reflog_ent(unsigned char *osha1, unsigned char *nsha1,
662 const char *email, unsigned long timestamp, int tz,
663 const char *message, void *cb_data)
71b03b42
SP
664{
665 handle_one_reflog_commit(osha1, cb_data);
666 handle_one_reflog_commit(nsha1, cb_data);
63049292
JH
667 return 0;
668}
669
670static int handle_one_reflog(const char *path, const unsigned char *sha1, int flag, void *cb_data)
671{
672 struct all_refs_cb *cb = cb_data;
71b03b42 673 cb->warned_bad_reflog = 0;
63049292
JH
674 cb->name_for_errormsg = path;
675 for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
676 return 0;
677}
678
679static void handle_reflog(struct rev_info *revs, unsigned flags)
680{
681 struct all_refs_cb cb;
682 cb.all_revs = revs;
683 cb.all_flags = flags;
25b51e2c 684 for_each_reflog(handle_one_reflog, &cb);
ae563542
LT
685}
686
ea4a19e1
JH
687static int add_parents_only(struct rev_info *revs, const char *arg, int flags)
688{
689 unsigned char sha1[20];
690 struct object *it;
691 struct commit *commit;
692 struct commit_list *parents;
693
694 if (*arg == '^') {
695 flags ^= UNINTERESTING;
696 arg++;
697 }
698 if (get_sha1(arg, sha1))
699 return 0;
700 while (1) {
701 it = get_reference(revs, arg, sha1, 0);
1974632c 702 if (it->type != OBJ_TAG)
ea4a19e1 703 break;
9684afd9
MK
704 if (!((struct tag*)it)->tagged)
705 return 0;
e702496e 706 hashcpy(sha1, ((struct tag*)it)->tagged->sha1);
ea4a19e1 707 }
1974632c 708 if (it->type != OBJ_COMMIT)
ea4a19e1
JH
709 return 0;
710 commit = (struct commit *)it;
711 for (parents = commit->parents; parents; parents = parents->next) {
712 it = &parents->item->object;
713 it->flags |= flags;
714 add_pending_object(revs, it, arg);
715 }
716 return 1;
717}
718
db6296a5 719void init_revisions(struct rev_info *revs, const char *prefix)
8efdc326
FK
720{
721 memset(revs, 0, sizeof(*revs));
8e8f9987 722
6b9c58f4 723 revs->abbrev = DEFAULT_ABBREV;
8e8f9987 724 revs->ignore_merges = 1;
9202434c 725 revs->simplify_history = 1;
8f67f8ae
PH
726 DIFF_OPT_SET(&revs->pruning, RECURSIVE);
727 DIFF_OPT_SET(&revs->pruning, QUIET);
cd2bdc53
LT
728 revs->pruning.add_remove = file_add_remove;
729 revs->pruning.change = file_change;
8efdc326
FK
730 revs->lifo = 1;
731 revs->dense = 1;
db6296a5 732 revs->prefix = prefix;
8efdc326
FK
733 revs->max_age = -1;
734 revs->min_age = -1;
d5db6c9e 735 revs->skip_count = -1;
8efdc326
FK
736 revs->max_count = -1;
737
cd2bdc53
LT
738 revs->commit_format = CMIT_FMT_DEFAULT;
739
740 diff_setup(&revs->diffopt);
8efdc326
FK
741}
742
0d2c9d67
RS
743static void add_pending_commit_list(struct rev_info *revs,
744 struct commit_list *commit_list,
745 unsigned int flags)
746{
747 while (commit_list) {
748 struct object *object = &commit_list->item->object;
749 object->flags |= flags;
750 add_pending_object(revs, object, sha1_to_hex(object->sha1));
751 commit_list = commit_list->next;
752 }
753}
754
ae3e5e1e
JH
755static void prepare_show_merge(struct rev_info *revs)
756{
757 struct commit_list *bases;
758 struct commit *head, *other;
759 unsigned char sha1[20];
760 const char **prune = NULL;
761 int i, prune_num = 1; /* counting terminating NULL */
762
763 if (get_sha1("HEAD", sha1) || !(head = lookup_commit(sha1)))
764 die("--merge without HEAD?");
765 if (get_sha1("MERGE_HEAD", sha1) || !(other = lookup_commit(sha1)))
766 die("--merge without MERGE_HEAD?");
767 add_pending_object(revs, &head->object, "HEAD");
768 add_pending_object(revs, &other->object, "MERGE_HEAD");
769 bases = get_merge_bases(head, other, 1);
770 while (bases) {
771 struct commit *it = bases->item;
772 struct commit_list *n = bases->next;
773 free(bases);
774 bases = n;
775 it->object.flags |= UNINTERESTING;
776 add_pending_object(revs, &it->object, "(merge-base)");
777 }
778
779 if (!active_nr)
780 read_cache();
781 for (i = 0; i < active_nr; i++) {
782 struct cache_entry *ce = active_cache[i];
783 if (!ce_stage(ce))
784 continue;
785 if (ce_path_match(ce, revs->prune_data)) {
786 prune_num++;
787 prune = xrealloc(prune, sizeof(*prune) * prune_num);
788 prune[prune_num-2] = ce->name;
789 prune[prune_num-1] = NULL;
790 }
791 while ((i+1 < active_nr) &&
792 ce_same_name(ce, active_cache[i+1]))
793 i++;
794 }
795 revs->prune_data = prune;
796}
797
5d6f0935
JH
798int handle_revision_arg(const char *arg, struct rev_info *revs,
799 int flags,
800 int cant_be_filename)
801{
bb6c2fba 802 unsigned mode;
5d6f0935
JH
803 char *dotdot;
804 struct object *object;
805 unsigned char sha1[20];
806 int local_flags;
807
808 dotdot = strstr(arg, "..");
809 if (dotdot) {
810 unsigned char from_sha1[20];
811 const char *next = dotdot + 2;
812 const char *this = arg;
813 int symmetric = *next == '.';
814 unsigned int flags_exclude = flags ^ UNINTERESTING;
815
816 *dotdot = 0;
817 next += symmetric;
818
819 if (!*next)
820 next = "HEAD";
821 if (dotdot == arg)
822 this = "HEAD";
823 if (!get_sha1(this, from_sha1) &&
824 !get_sha1(next, sha1)) {
825 struct commit *a, *b;
826 struct commit_list *exclude;
827
828 a = lookup_commit_reference(from_sha1);
829 b = lookup_commit_reference(sha1);
830 if (!a || !b) {
831 die(symmetric ?
832 "Invalid symmetric difference expression %s...%s" :
833 "Invalid revision range %s..%s",
834 arg, next);
835 }
836
837 if (!cant_be_filename) {
838 *dotdot = '.';
839 verify_non_filename(revs->prefix, arg);
840 }
841
842 if (symmetric) {
843 exclude = get_merge_bases(a, b, 1);
844 add_pending_commit_list(revs, exclude,
845 flags_exclude);
846 free_commit_list(exclude);
577ed5c2 847 a->object.flags |= flags | SYMMETRIC_LEFT;
5d6f0935
JH
848 } else
849 a->object.flags |= flags_exclude;
850 b->object.flags |= flags;
851 add_pending_object(revs, &a->object, this);
852 add_pending_object(revs, &b->object, next);
853 return 0;
854 }
855 *dotdot = '.';
856 }
857 dotdot = strstr(arg, "^@");
858 if (dotdot && !dotdot[2]) {
859 *dotdot = 0;
860 if (add_parents_only(revs, arg, flags))
861 return 0;
862 *dotdot = '^';
863 }
62476c8e
JH
864 dotdot = strstr(arg, "^!");
865 if (dotdot && !dotdot[2]) {
866 *dotdot = 0;
867 if (!add_parents_only(revs, arg, flags ^ UNINTERESTING))
868 *dotdot = '^';
869 }
870
5d6f0935
JH
871 local_flags = 0;
872 if (*arg == '^') {
873 local_flags = UNINTERESTING;
874 arg++;
875 }
bb6c2fba 876 if (get_sha1_with_mode(arg, sha1, &mode))
5d6f0935
JH
877 return -1;
878 if (!cant_be_filename)
879 verify_non_filename(revs->prefix, arg);
880 object = get_reference(revs, arg, sha1, flags ^ local_flags);
bb6c2fba 881 add_pending_object_with_mode(revs, object, arg, mode);
5d6f0935
JH
882 return 0;
883}
884
2d10c555 885static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
bd95fcd3 886{
2d10c555 887 if (!revs->grep_filter) {
bd95fcd3
JH
888 struct grep_opt *opt = xcalloc(1, sizeof(*opt));
889 opt->status_only = 1;
890 opt->pattern_tail = &(opt->pattern_list);
891 opt->regflags = REG_NEWLINE;
2d10c555 892 revs->grep_filter = opt;
bd95fcd3 893 }
2d10c555
JH
894 append_grep_pattern(revs->grep_filter, ptn,
895 "command line", 0, what);
896}
897
898static void add_header_grep(struct rev_info *revs, const char *field, const char *pattern)
899{
900 char *pat;
901 const char *prefix;
902 int patlen, fldlen;
bd95fcd3
JH
903
904 fldlen = strlen(field);
905 patlen = strlen(pattern);
a2ed6ae4
LT
906 pat = xmalloc(patlen + fldlen + 10);
907 prefix = ".*";
908 if (*pattern == '^') {
909 prefix = "";
910 pattern++;
911 }
912 sprintf(pat, "^%s %s%s", field, prefix, pattern);
2d10c555 913 add_grep(revs, pat, GREP_PATTERN_HEAD);
bd95fcd3
JH
914}
915
916static void add_message_grep(struct rev_info *revs, const char *pattern)
917{
2d10c555 918 add_grep(revs, pattern, GREP_PATTERN_BODY);
bd95fcd3
JH
919}
920
106d710b
JH
921static void add_ignore_packed(struct rev_info *revs, const char *name)
922{
923 int num = ++revs->num_ignore_packed;
924
925 revs->ignore_packed = xrealloc(revs->ignore_packed,
926 sizeof(const char **) * (num + 1));
927 revs->ignore_packed[num-1] = name;
928 revs->ignore_packed[num] = NULL;
929}
930
ae563542
LT
931/*
932 * Parse revision information, filling in the "rev_info" structure,
933 * and removing the used arguments from the argument list.
934 *
765ac8ec
LT
935 * Returns the number of arguments left that weren't recognized
936 * (which are also moved to the head of the argument list)
ae563542 937 */
a4a88b2b 938int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
ae563542 939{
ae3e5e1e 940 int i, flags, seen_dashdash, show_merge;
765ac8ec 941 const char **unrecognized = argv + 1;
ae563542 942 int left = 1;
70d0afba 943 int all_match = 0;
93d496a5 944 int regflags = 0;
ae563542 945
ae563542
LT
946 /* First, search for "--" */
947 seen_dashdash = 0;
948 for (i = 1; i < argc; i++) {
949 const char *arg = argv[i];
950 if (strcmp(arg, "--"))
951 continue;
952 argv[i] = NULL;
953 argc = i;
a65f2005
JH
954 if (argv[i + 1])
955 revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
ae563542
LT
956 seen_dashdash = 1;
957 break;
958 }
959
ae3e5e1e 960 flags = show_merge = 0;
ae563542 961 for (i = 1; i < argc; i++) {
ae563542 962 const char *arg = argv[i];
ae563542 963 if (*arg == '-') {
cd2bdc53 964 int opts;
cc44c765 965 if (!prefixcmp(arg, "--max-count=")) {
ae563542
LT
966 revs->max_count = atoi(arg + 12);
967 continue;
968 }
cc44c765 969 if (!prefixcmp(arg, "--skip=")) {
d5db6c9e
JH
970 revs->skip_count = atoi(arg + 7);
971 continue;
972 }
de5f2bf3 973 /* accept -<digit>, like traditional "head" */
64bc6e3d
JH
974 if ((*arg == '-') && isdigit(arg[1])) {
975 revs->max_count = atoi(arg + 1);
976 continue;
977 }
978 if (!strcmp(arg, "-n")) {
979 if (argc <= i + 1)
980 die("-n requires an argument");
981 revs->max_count = atoi(argv[++i]);
982 continue;
983 }
1968d77d 984 if (!prefixcmp(arg, "-n")) {
64bc6e3d
JH
985 revs->max_count = atoi(arg + 2);
986 continue;
987 }
cc44c765 988 if (!prefixcmp(arg, "--max-age=")) {
ae563542 989 revs->max_age = atoi(arg + 10);
ae563542
LT
990 continue;
991 }
cc44c765 992 if (!prefixcmp(arg, "--since=")) {
fd751667 993 revs->max_age = approxidate(arg + 8);
fd751667
JH
994 continue;
995 }
cc44c765 996 if (!prefixcmp(arg, "--after=")) {
fd751667 997 revs->max_age = approxidate(arg + 8);
53069686
JH
998 continue;
999 }
cc44c765 1000 if (!prefixcmp(arg, "--min-age=")) {
53069686 1001 revs->min_age = atoi(arg + 10);
fd751667
JH
1002 continue;
1003 }
cc44c765 1004 if (!prefixcmp(arg, "--before=")) {
fd751667 1005 revs->min_age = approxidate(arg + 9);
fd751667
JH
1006 continue;
1007 }
cc44c765 1008 if (!prefixcmp(arg, "--until=")) {
fd751667 1009 revs->min_age = approxidate(arg + 8);
fd751667
JH
1010 continue;
1011 }
ae563542
LT
1012 if (!strcmp(arg, "--all")) {
1013 handle_all(revs, flags);
1014 continue;
1015 }
0053e902
JH
1016 if (!strcmp(arg, "--first-parent")) {
1017 revs->first_parent_only = 1;
1018 continue;
1019 }
63049292
JH
1020 if (!strcmp(arg, "--reflog")) {
1021 handle_reflog(revs, flags);
1022 continue;
1023 }
084ae0a7
JS
1024 if (!strcmp(arg, "-g") ||
1025 !strcmp(arg, "--walk-reflogs")) {
8860fd42
JS
1026 init_reflog_walk(&revs->reflog_info);
1027 continue;
1028 }
ae563542
LT
1029 if (!strcmp(arg, "--not")) {
1030 flags ^= UNINTERESTING;
1031 continue;
1032 }
1033 if (!strcmp(arg, "--default")) {
1034 if (++i >= argc)
1035 die("bad --default argument");
1036 def = argv[i];
1037 continue;
1038 }
ae3e5e1e
JH
1039 if (!strcmp(arg, "--merge")) {
1040 show_merge = 1;
1041 continue;
1042 }
ae563542
LT
1043 if (!strcmp(arg, "--topo-order")) {
1044 revs->topo_order = 1;
1045 continue;
1046 }
1047 if (!strcmp(arg, "--date-order")) {
1048 revs->lifo = 0;
1049 revs->topo_order = 1;
1050 continue;
1051 }
cdcefbc9
LT
1052 if (!prefixcmp(arg, "--early-output")) {
1053 int count = 100;
1054 switch (arg[14]) {
1055 case '=':
1056 count = atoi(arg+15);
1057 /* Fallthrough */
1058 case 0:
1059 revs->topo_order = 1;
1060 revs->early_output = count;
1061 continue;
1062 }
1063 }
7b0c9966
LT
1064 if (!strcmp(arg, "--parents")) {
1065 revs->parents = 1;
1066 continue;
1067 }
ae563542
LT
1068 if (!strcmp(arg, "--dense")) {
1069 revs->dense = 1;
1070 continue;
1071 }
1072 if (!strcmp(arg, "--sparse")) {
1073 revs->dense = 0;
1074 continue;
1075 }
3131b713
LT
1076 if (!strcmp(arg, "--show-all")) {
1077 revs->show_all = 1;
1078 continue;
1079 }
ae563542
LT
1080 if (!strcmp(arg, "--remove-empty")) {
1081 revs->remove_empty_trees = 1;
1082 continue;
1083 }
5cdeae71 1084 if (!strcmp(arg, "--no-merges")) {
765ac8ec
LT
1085 revs->no_merges = 1;
1086 continue;
1087 }
384e99a4
JH
1088 if (!strcmp(arg, "--boundary")) {
1089 revs->boundary = 1;
1090 continue;
1091 }
8dce8235
JH
1092 if (!strcmp(arg, "--left-right")) {
1093 revs->left_right = 1;
74bd9029
JH
1094 continue;
1095 }
d7a17cad
JH
1096 if (!strcmp(arg, "--cherry-pick")) {
1097 revs->cherry_pick = 1;
023756f4 1098 revs->limited = 1;
d7a17cad
JH
1099 continue;
1100 }
ae563542
LT
1101 if (!strcmp(arg, "--objects")) {
1102 revs->tag_objects = 1;
1103 revs->tree_objects = 1;
1104 revs->blob_objects = 1;
1105 continue;
1106 }
1107 if (!strcmp(arg, "--objects-edge")) {
1108 revs->tag_objects = 1;
1109 revs->tree_objects = 1;
1110 revs->blob_objects = 1;
1111 revs->edge_hint = 1;
1112 continue;
1113 }
d9a83684
LT
1114 if (!strcmp(arg, "--unpacked")) {
1115 revs->unpacked = 1;
106d710b
JH
1116 free(revs->ignore_packed);
1117 revs->ignore_packed = NULL;
1118 revs->num_ignore_packed = 0;
1119 continue;
1120 }
cc44c765 1121 if (!prefixcmp(arg, "--unpacked=")) {
106d710b
JH
1122 revs->unpacked = 1;
1123 add_ignore_packed(revs, arg+11);
d9a83684
LT
1124 continue;
1125 }
cd2bdc53
LT
1126 if (!strcmp(arg, "-r")) {
1127 revs->diff = 1;
8f67f8ae 1128 DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
cd2bdc53
LT
1129 continue;
1130 }
1131 if (!strcmp(arg, "-t")) {
1132 revs->diff = 1;
8f67f8ae
PH
1133 DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
1134 DIFF_OPT_SET(&revs->diffopt, TREE_IN_RECURSIVE);
cd2bdc53
LT
1135 continue;
1136 }
1137 if (!strcmp(arg, "-m")) {
1138 revs->ignore_merges = 0;
1139 continue;
1140 }
1141 if (!strcmp(arg, "-c")) {
1142 revs->diff = 1;
0fe7c1de 1143 revs->dense_combined_merges = 0;
cd2bdc53
LT
1144 revs->combine_merges = 1;
1145 continue;
1146 }
1147 if (!strcmp(arg, "--cc")) {
1148 revs->diff = 1;
1149 revs->dense_combined_merges = 1;
1150 revs->combine_merges = 1;
1151 continue;
1152 }
1153 if (!strcmp(arg, "-v")) {
1154 revs->verbose_header = 1;
cd2bdc53
LT
1155 continue;
1156 }
cc44c765 1157 if (!prefixcmp(arg, "--pretty")) {
cd2bdc53 1158 revs->verbose_header = 1;
cd2bdc53
LT
1159 revs->commit_format = get_commit_format(arg+8);
1160 continue;
1161 }
1162 if (!strcmp(arg, "--root")) {
1163 revs->show_root_diff = 1;
1164 continue;
1165 }
1166 if (!strcmp(arg, "--no-commit-id")) {
1167 revs->no_commit_id = 1;
1168 continue;
1169 }
1170 if (!strcmp(arg, "--always")) {
1171 revs->always_show_header = 1;
1172 continue;
1173 }
1174 if (!strcmp(arg, "--no-abbrev")) {
1175 revs->abbrev = 0;
1176 continue;
1177 }
1178 if (!strcmp(arg, "--abbrev")) {
1179 revs->abbrev = DEFAULT_ABBREV;
1180 continue;
1181 }
cc44c765 1182 if (!prefixcmp(arg, "--abbrev=")) {
508d9e37
LT
1183 revs->abbrev = strtoul(arg + 9, NULL, 10);
1184 if (revs->abbrev < MINIMUM_ABBREV)
1185 revs->abbrev = MINIMUM_ABBREV;
1186 else if (revs->abbrev > 40)
1187 revs->abbrev = 40;
1188 continue;
1189 }
cd2bdc53
LT
1190 if (!strcmp(arg, "--abbrev-commit")) {
1191 revs->abbrev_commit = 1;
1192 continue;
1193 }
1194 if (!strcmp(arg, "--full-diff")) {
1195 revs->diff = 1;
1196 revs->full_diff = 1;
1197 continue;
1198 }
9202434c
LT
1199 if (!strcmp(arg, "--full-history")) {
1200 revs->simplify_history = 0;
1201 continue;
1202 }
3dfb9278 1203 if (!strcmp(arg, "--relative-date")) {
a7b02ccf
JH
1204 revs->date_mode = DATE_RELATIVE;
1205 continue;
1206 }
1207 if (!strncmp(arg, "--date=", 7)) {
856665f8 1208 revs->date_mode = parse_date_format(arg + 7);
3dfb9278
JF
1209 continue;
1210 }
9fa3465d
MC
1211 if (!strcmp(arg, "--log-size")) {
1212 revs->show_log_size = 1;
1213 continue;
1214 }
2d10c555
JH
1215
1216 /*
1217 * Grepping the commit log
1218 */
cc44c765 1219 if (!prefixcmp(arg, "--author=")) {
bd95fcd3
JH
1220 add_header_grep(revs, "author", arg+9);
1221 continue;
1222 }
cc44c765 1223 if (!prefixcmp(arg, "--committer=")) {
bd95fcd3
JH
1224 add_header_grep(revs, "committer", arg+12);
1225 continue;
1226 }
cc44c765 1227 if (!prefixcmp(arg, "--grep=")) {
bd95fcd3
JH
1228 add_message_grep(revs, arg+7);
1229 continue;
1230 }
e5633cbb
JH
1231 if (!strcmp(arg, "--extended-regexp") ||
1232 !strcmp(arg, "-E")) {
93d496a5
PB
1233 regflags |= REG_EXTENDED;
1234 continue;
1235 }
e5633cbb
JH
1236 if (!strcmp(arg, "--regexp-ignore-case") ||
1237 !strcmp(arg, "-i")) {
93d496a5
PB
1238 regflags |= REG_ICASE;
1239 continue;
1240 }
70d0afba
JH
1241 if (!strcmp(arg, "--all-match")) {
1242 all_match = 1;
1243 continue;
1244 }
cc44c765 1245 if (!prefixcmp(arg, "--encoding=")) {
7cbcf4d5
JH
1246 arg += 11;
1247 if (strcmp(arg, "none"))
567fb65e 1248 git_log_output_encoding = xstrdup(arg);
7cbcf4d5
JH
1249 else
1250 git_log_output_encoding = "";
1251 continue;
1252 }
9c5e66e9
JS
1253 if (!strcmp(arg, "--reverse")) {
1254 revs->reverse ^= 1;
1255 continue;
1256 }
8e64006e
JS
1257 if (!strcmp(arg, "--no-walk")) {
1258 revs->no_walk = 1;
1259 continue;
1260 }
1261 if (!strcmp(arg, "--do-walk")) {
1262 revs->no_walk = 0;
1263 continue;
1264 }
2d10c555 1265
cd2bdc53
LT
1266 opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
1267 if (opts > 0) {
cd2bdc53
LT
1268 i += opts - 1;
1269 continue;
1270 }
ae563542
LT
1271 *unrecognized++ = arg;
1272 left++;
1273 continue;
1274 }
ae563542 1275
5d6f0935
JH
1276 if (handle_revision_arg(arg, revs, flags, seen_dashdash)) {
1277 int j;
1278 if (seen_dashdash || *arg == '^')
ae563542
LT
1279 die("bad revision '%s'", arg);
1280
ea92f41f
JH
1281 /* If we didn't have a "--":
1282 * (1) all filenames must exist;
1283 * (2) all rev-args must not be interpretable
1284 * as a valid filename.
1285 * but the latter we have checked in the main loop.
1286 */
e23d0b4a
LT
1287 for (j = i; j < argc; j++)
1288 verify_filename(revs->prefix, argv[j]);
1289
5d6f0935
JH
1290 revs->prune_data = get_pathspec(revs->prefix,
1291 argv + i);
ae563542
LT
1292 break;
1293 }
ae563542 1294 }
5d6f0935 1295
93d496a5
PB
1296 if (revs->grep_filter)
1297 revs->grep_filter->regflags |= regflags;
1298
ae3e5e1e
JH
1299 if (show_merge)
1300 prepare_show_merge(revs);
1f1e895f 1301 if (def && !revs->pending.nr) {
ae563542 1302 unsigned char sha1[20];
cd2bdc53 1303 struct object *object;
bb6c2fba
MK
1304 unsigned mode;
1305 if (get_sha1_with_mode(def, sha1, &mode))
ae563542 1306 die("bad default revision '%s'", def);
cd2bdc53 1307 object = get_reference(revs, def, sha1, 0);
bb6c2fba 1308 add_pending_object_with_mode(revs, object, def, mode);
ae563542 1309 }
8efdc326 1310
b7bb760d
LT
1311 /* Did the user ask for any diff output? Run the diff! */
1312 if (revs->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT)
1313 revs->diff = 1;
1314
0faf2da7
AL
1315 /* Pickaxe, diff-filter and rename following need diffs */
1316 if (revs->diffopt.pickaxe ||
1317 revs->diffopt.filter ||
1318 DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
b7bb760d
LT
1319 revs->diff = 1;
1320
9dad9d2e 1321 if (revs->topo_order)
53069686
JH
1322 revs->limited = 1;
1323
8efdc326 1324 if (revs->prune_data) {
cd2bdc53 1325 diff_tree_setup_paths(revs->prune_data, &revs->pruning);
750f7b66 1326 /* Can't prune commits with rename following: the paths change.. */
8f67f8ae 1327 if (!DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
53b2c823 1328 revs->prune = 1;
cd2bdc53
LT
1329 if (!revs->full_diff)
1330 diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
8efdc326 1331 }
cd2bdc53
LT
1332 if (revs->combine_merges) {
1333 revs->ignore_merges = 0;
0e677e1a 1334 if (revs->dense_combined_merges && !revs->diffopt.output_format)
cd2bdc53
LT
1335 revs->diffopt.output_format = DIFF_FORMAT_PATCH;
1336 }
cd2bdc53 1337 revs->diffopt.abbrev = revs->abbrev;
72ee96c0
JH
1338 if (diff_setup_done(&revs->diffopt) < 0)
1339 die("diff_setup_done failed");
8efdc326 1340
70d0afba
JH
1341 if (revs->grep_filter) {
1342 revs->grep_filter->all_match = all_match;
2d10c555 1343 compile_grep_patterns(revs->grep_filter);
70d0afba 1344 }
bd95fcd3 1345
d56651c0
SP
1346 if (revs->reverse && revs->reflog_info)
1347 die("cannot combine --reverse with --walk-reflogs");
1348
ae563542
LT
1349 return left;
1350}
a4a88b2b 1351
cc0e6c5a 1352int prepare_revision_walk(struct rev_info *revs)
a4a88b2b 1353{
1f1e895f 1354 int nr = revs->pending.nr;
94d23673 1355 struct object_array_entry *e, *list;
cd2bdc53 1356
94d23673 1357 e = list = revs->pending.objects;
1f1e895f
LT
1358 revs->pending.nr = 0;
1359 revs->pending.alloc = 0;
1360 revs->pending.objects = NULL;
1361 while (--nr >= 0) {
94d23673 1362 struct commit *commit = handle_commit(revs, e->item, e->name);
cd2bdc53
LT
1363 if (commit) {
1364 if (!(commit->object.flags & SEEN)) {
1365 commit->object.flags |= SEEN;
1366 insert_by_date(commit, &revs->commits);
1367 }
1368 }
94d23673 1369 e++;
cd2bdc53 1370 }
94d23673 1371 free(list);
cd2bdc53 1372
ba1d4505 1373 if (revs->no_walk)
cc0e6c5a 1374 return 0;
a4a88b2b 1375 if (revs->limited)
cc0e6c5a
AR
1376 if (limit_list(revs) < 0)
1377 return -1;
a4a88b2b 1378 if (revs->topo_order)
23c17d4a 1379 sort_in_topological_order(&revs->commits, revs->lifo);
cc0e6c5a 1380 return 0;
a4a88b2b
LT
1381}
1382
cc0e6c5a
AR
1383enum rewrite_result {
1384 rewrite_one_ok,
1385 rewrite_one_noparents,
1386 rewrite_one_error,
1387};
1388
1389static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
765ac8ec
LT
1390{
1391 for (;;) {
1392 struct commit *p = *pp;
3381c790 1393 if (!revs->limited)
cc0e6c5a
AR
1394 if (add_parents_to_list(revs, p, &revs->commits) < 0)
1395 return rewrite_one_error;
6631c736 1396 if (p->parents && p->parents->next)
cc0e6c5a 1397 return rewrite_one_ok;
7dc0fe3b
LT
1398 if (p->object.flags & UNINTERESTING)
1399 return rewrite_one_ok;
1400 if (!(p->object.flags & TREESAME))
cc0e6c5a 1401 return rewrite_one_ok;
765ac8ec 1402 if (!p->parents)
cc0e6c5a 1403 return rewrite_one_noparents;
765ac8ec
LT
1404 *pp = p->parents->item;
1405 }
1406}
1407
11d65967
JH
1408static void remove_duplicate_parents(struct commit *commit)
1409{
e1abc69b 1410 struct commit_list **pp, *p;
11d65967
JH
1411
1412 /* Examine existing parents while marking ones we have seen... */
e1abc69b
LT
1413 pp = &commit->parents;
1414 while ((p = *pp) != NULL) {
11d65967 1415 struct commit *parent = p->item;
e1abc69b
LT
1416 if (parent->object.flags & TMP_MARK) {
1417 *pp = p->next;
11d65967 1418 continue;
e1abc69b 1419 }
11d65967 1420 parent->object.flags |= TMP_MARK;
11d65967
JH
1421 pp = &p->next;
1422 }
1423 /* ... and clear the temporary mark */
1424 for (p = commit->parents; p; p = p->next)
1425 p->item->object.flags &= ~TMP_MARK;
1426}
1427
cc0e6c5a 1428static int rewrite_parents(struct rev_info *revs, struct commit *commit)
765ac8ec
LT
1429{
1430 struct commit_list **pp = &commit->parents;
1431 while (*pp) {
1432 struct commit_list *parent = *pp;
cc0e6c5a
AR
1433 switch (rewrite_one(revs, &parent->item)) {
1434 case rewrite_one_ok:
1435 break;
1436 case rewrite_one_noparents:
765ac8ec
LT
1437 *pp = parent->next;
1438 continue;
cc0e6c5a
AR
1439 case rewrite_one_error:
1440 return -1;
765ac8ec
LT
1441 }
1442 pp = &parent->next;
1443 }
11d65967 1444 remove_duplicate_parents(commit);
cc0e6c5a 1445 return 0;
765ac8ec
LT
1446}
1447
8ecae9b0
JH
1448static int commit_match(struct commit *commit, struct rev_info *opt)
1449{
2d10c555 1450 if (!opt->grep_filter)
8ecae9b0 1451 return 1;
2d10c555
JH
1452 return grep_buffer(opt->grep_filter,
1453 NULL, /* we say nothing, not even filename */
1454 commit->buffer, strlen(commit->buffer));
8ecae9b0
JH
1455}
1456
252a7c02
LT
1457enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
1458{
1459 if (commit->object.flags & SHOWN)
1460 return commit_ignore;
1461 if (revs->unpacked && has_sha1_pack(commit->object.sha1, revs->ignore_packed))
1462 return commit_ignore;
3131b713
LT
1463 if (revs->show_all)
1464 return commit_show;
252a7c02
LT
1465 if (commit->object.flags & UNINTERESTING)
1466 return commit_ignore;
1467 if (revs->min_age != -1 && (commit->date > revs->min_age))
1468 return commit_ignore;
1469 if (revs->no_merges && commit->parents && commit->parents->next)
1470 return commit_ignore;
1471 if (!commit_match(commit, revs))
1472 return commit_ignore;
53b2c823 1473 if (revs->prune && revs->dense) {
252a7c02 1474 /* Commit without changes? */
7dc0fe3b 1475 if (commit->object.flags & TREESAME) {
252a7c02
LT
1476 /* drop merges unless we want parenthood */
1477 if (!revs->parents)
1478 return commit_ignore;
1479 /* non-merge - always ignore it */
1480 if (!commit->parents || !commit->parents->next)
1481 return commit_ignore;
1482 }
1483 if (revs->parents && rewrite_parents(revs, commit) < 0)
1484 return commit_error;
1485 }
1486 return commit_show;
1487}
1488
d5db6c9e 1489static struct commit *get_revision_1(struct rev_info *revs)
a4a88b2b 1490{
d5db6c9e 1491 if (!revs->commits)
a4a88b2b 1492 return NULL;
a4a88b2b 1493
765ac8ec 1494 do {
cb115748
LT
1495 struct commit_list *entry = revs->commits;
1496 struct commit *commit = entry->item;
ea5ed3ab 1497
cb115748
LT
1498 revs->commits = entry->next;
1499 free(entry);
2a0925be 1500
8860fd42
JS
1501 if (revs->reflog_info)
1502 fake_reflog_parent(revs->reflog_info, commit);
1503
2a0925be
LT
1504 /*
1505 * If we haven't done the list limiting, we need to look at
be7db6e5
LT
1506 * the parents here. We also need to do the date-based limiting
1507 * that we'd otherwise have done in limit_list().
2a0925be 1508 */
be7db6e5 1509 if (!revs->limited) {
744f4985 1510 if (revs->max_age != -1 &&
86ab4906
JH
1511 (commit->date < revs->max_age))
1512 continue;
cc0e6c5a
AR
1513 if (add_parents_to_list(revs, commit, &revs->commits) < 0)
1514 return NULL;
be7db6e5 1515 }
744f4985 1516
252a7c02
LT
1517 switch (simplify_commit(revs, commit)) {
1518 case commit_ignore:
8ecae9b0 1519 continue;
252a7c02
LT
1520 case commit_error:
1521 return NULL;
1522 default:
1523 return commit;
384e99a4 1524 }
765ac8ec
LT
1525 } while (revs->commits);
1526 return NULL;
1527}
d5db6c9e 1528
86ab4906
JH
1529static void gc_boundary(struct object_array *array)
1530{
1531 unsigned nr = array->nr;
1532 unsigned alloc = array->alloc;
1533 struct object_array_entry *objects = array->objects;
1534
1535 if (alloc <= nr) {
1536 unsigned i, j;
1537 for (i = j = 0; i < nr; i++) {
1538 if (objects[i].item->flags & SHOWN)
1539 continue;
1540 if (i != j)
1541 objects[j] = objects[i];
1542 j++;
1543 }
892ae6bf 1544 for (i = j; i < nr; i++)
86ab4906
JH
1545 objects[i].item = NULL;
1546 array->nr = j;
1547 }
1548}
1549
d5db6c9e
JH
1550struct commit *get_revision(struct rev_info *revs)
1551{
1552 struct commit *c = NULL;
86ab4906
JH
1553 struct commit_list *l;
1554
1555 if (revs->boundary == 2) {
1556 unsigned i;
1557 struct object_array *array = &revs->boundary_commits;
1558 struct object_array_entry *objects = array->objects;
1559 for (i = 0; i < array->nr; i++) {
1560 c = (struct commit *)(objects[i].item);
1561 if (!c)
1562 continue;
1563 if (!(c->object.flags & CHILD_SHOWN))
1564 continue;
1565 if (!(c->object.flags & SHOWN))
1566 break;
9c5e66e9 1567 }
86ab4906 1568 if (array->nr <= i)
9c5e66e9 1569 return NULL;
86ab4906
JH
1570
1571 c->object.flags |= SHOWN | BOUNDARY;
9c5e66e9
JS
1572 return c;
1573 }
1574
86ab4906 1575 if (revs->reverse) {
c33d8593
JH
1576 int limit = -1;
1577
1578 if (0 <= revs->max_count) {
1579 limit = revs->max_count;
1580 if (0 < revs->skip_count)
1581 limit += revs->skip_count;
1582 }
86ab4906 1583 l = NULL;
c33d8593 1584 while ((c = get_revision_1(revs))) {
86ab4906 1585 commit_list_insert(c, &l);
c33d8593
JH
1586 if ((0 < limit) && !--limit)
1587 break;
1588 }
86ab4906
JH
1589 revs->commits = l;
1590 revs->reverse = 0;
c33d8593 1591 revs->max_count = -1;
2b064697 1592 c = NULL;
d5db6c9e
JH
1593 }
1594
86ab4906
JH
1595 /*
1596 * Now pick up what they want to give us
1597 */
8839ac94
JH
1598 c = get_revision_1(revs);
1599 if (c) {
1600 while (0 < revs->skip_count) {
1601 revs->skip_count--;
1602 c = get_revision_1(revs);
1603 if (!c)
1604 break;
1605 }
86ab4906
JH
1606 }
1607
1608 /*
1609 * Check the max_count.
1610 */
d5db6c9e
JH
1611 switch (revs->max_count) {
1612 case -1:
1613 break;
1614 case 0:
86ab4906
JH
1615 c = NULL;
1616 break;
d5db6c9e
JH
1617 default:
1618 revs->max_count--;
1619 }
86ab4906 1620
c33d8593
JH
1621 if (c)
1622 c->object.flags |= SHOWN;
1623
1624 if (!revs->boundary) {
d5db6c9e 1625 return c;
c33d8593 1626 }
86ab4906
JH
1627
1628 if (!c) {
1629 /*
1630 * get_revision_1() runs out the commits, and
1631 * we are done computing the boundaries.
1632 * switch to boundary commits output mode.
1633 */
1634 revs->boundary = 2;
1635 return get_revision(revs);
1636 }
1637
1638 /*
1639 * boundary commits are the commits that are parents of the
1640 * ones we got from get_revision_1() but they themselves are
1641 * not returned from get_revision_1(). Before returning
1642 * 'c', we need to mark its parents that they could be boundaries.
1643 */
1644
1645 for (l = c->parents; l; l = l->next) {
1646 struct object *p;
1647 p = &(l->item->object);
c33d8593 1648 if (p->flags & (CHILD_SHOWN | SHOWN))
86ab4906
JH
1649 continue;
1650 p->flags |= CHILD_SHOWN;
1651 gc_boundary(&revs->boundary_commits);
1652 add_object_array(p, NULL, &revs->boundary_commits);
1653 }
1654
1655 return c;
d5db6c9e 1656}