reflog-walk: stop using fake parents
[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"
7fefda5c 9#include "graph.h"
8ecae9b0 10#include "grep.h"
8860fd42 11#include "reflog-walk.h"
d7a17cad 12#include "patch-ids.h"
f35f5603 13#include "decorate.h"
78892e32 14#include "log-tree.h"
894a9d33 15#include "string-list.h"
12da1d1f 16#include "line-log.h"
d72fbe81 17#include "mailmap.h"
53d00b39 18#include "commit-slab.h"
429bb40a 19#include "dir.h"
4fe10219 20#include "cache-tree.h"
cb46d630 21#include "bisect.h"
ae563542 22
cdcefbc9
LT
23volatile show_early_output_fn_t show_early_output;
24
cb46d630
AD
25static const char *term_bad;
26static const char *term_good;
27
de1e67d0 28void show_object_with_name(FILE *out, struct object *obj, const char *name)
ae563542 29{
de1e67d0 30 const char *p;
91f17516 31
f2fd0760 32 fprintf(out, "%s ", oid_to_hex(&obj->oid));
f9fb9d0e
JK
33 for (p = name; *p && *p != '\n'; p++)
34 fputc(*p, out);
beba25ab 35 fputc('\n', out);
91f17516
JH
36}
37
ae563542
LT
38static void mark_blob_uninteresting(struct blob *blob)
39{
c1ee9013
MK
40 if (!blob)
41 return;
ae563542
LT
42 if (blob->object.flags & UNINTERESTING)
43 return;
44 blob->object.flags |= UNINTERESTING;
45}
46
2ac5e447 47static void mark_tree_contents_uninteresting(struct tree *tree)
ae563542 48{
f75e53ed 49 struct tree_desc desc;
4c068a98 50 struct name_entry entry;
ae563542 51 struct object *obj = &tree->object;
ae563542 52
f2fd0760 53 if (!has_object_file(&obj->oid))
ae563542
LT
54 return;
55 if (parse_tree(tree) < 0)
f2fd0760 56 die("bad tree %s", oid_to_hex(&obj->oid));
f75e53ed 57
6fda5e51 58 init_tree_desc(&desc, tree->buffer, tree->size);
4c068a98 59 while (tree_entry(&desc, &entry)) {
4d1012c3
LT
60 switch (object_type(entry.mode)) {
61 case OBJ_TREE:
740ee055 62 mark_tree_uninteresting(lookup_tree(entry.oid));
4d1012c3
LT
63 break;
64 case OBJ_BLOB:
3aca1fc6 65 mark_blob_uninteresting(lookup_blob(entry.oid));
4d1012c3
LT
66 break;
67 default:
68 /* Subproject commit - not in this repository */
69 break;
70 }
ae563542 71 }
f75e53ed
LT
72
73 /*
74 * We don't care about the tree any more
75 * after it has been marked uninteresting.
76 */
6e454b9a 77 free_tree_buffer(tree);
ae563542
LT
78}
79
2ac5e447
JH
80void mark_tree_uninteresting(struct tree *tree)
81{
a2678df3 82 struct object *obj;
2ac5e447
JH
83
84 if (!tree)
85 return;
a2678df3
SN
86
87 obj = &tree->object;
2ac5e447
JH
88 if (obj->flags & UNINTERESTING)
89 return;
90 obj->flags |= UNINTERESTING;
91 mark_tree_contents_uninteresting(tree);
ae563542
LT
92}
93
94void mark_parents_uninteresting(struct commit *commit)
95{
941ba8db
NTND
96 struct commit_list *parents = NULL, *l;
97
98 for (l = commit->parents; l; l = l->next)
99 commit_list_insert(l->item, &parents);
ae563542
LT
100
101 while (parents) {
e510ab89 102 struct commit *commit = pop_commit(&parents);
941ba8db
NTND
103
104 while (commit) {
105 /*
106 * A missing commit is ok iff its parent is marked
107 * uninteresting.
108 *
109 * We just mark such a thing parsed, so that when
110 * it is popped next time around, we won't be trying
111 * to parse it and get an error.
112 */
f2fd0760 113 if (!has_object_file(&commit->object.oid))
941ba8db
NTND
114 commit->object.parsed = 1;
115
116 if (commit->object.flags & UNINTERESTING)
117 break;
118
d2c4af73 119 commit->object.flags |= UNINTERESTING;
ae563542 120
d2c4af73
MU
121 /*
122 * Normally we haven't parsed the parent
123 * yet, so we won't have a parent of a parent
124 * here. However, it may turn out that we've
125 * reached this commit some other way (where it
126 * wasn't uninteresting), in which case we need
127 * to mark its parents recursively too..
128 */
941ba8db
NTND
129 if (!commit->parents)
130 break;
ae563542 131
941ba8db
NTND
132 for (l = commit->parents->next; l; l = l->next)
133 commit_list_insert(l->item, &parents);
134 commit = commit->parents->item;
135 }
ae563542
LT
136 }
137}
138
20739490 139static void add_pending_object_with_path(struct rev_info *revs,
ff5f5f26 140 struct object *obj,
20739490
JK
141 const char *name, unsigned mode,
142 const char *path)
ae563542 143{
cc243c3c
JH
144 if (!obj)
145 return;
aa27e461 146 if (revs->no_walk && (obj->flags & UNINTERESTING))
f222abde 147 revs->no_walk = 0;
105e4733
JH
148 if (revs->reflog_info && obj->type == OBJ_COMMIT) {
149 struct strbuf buf = STRBUF_INIT;
0e9f62da 150 int len = interpret_branch_name(name, 0, &buf, 0);
105e4733
JH
151
152 if (0 < len && name[len] && buf.len)
153 strbuf_addstr(&buf, name + len);
d08565bf
JK
154 add_reflog_for_walk(revs->reflog_info,
155 (struct commit *)obj,
156 buf.buf[0] ? buf.buf: name);
105e4733 157 strbuf_release(&buf);
d08565bf 158 return; /* do not add the commit itself */
105e4733 159 }
20739490
JK
160 add_object_array_with_path(obj, name, &revs->pending, mode, path);
161}
162
163static void add_pending_object_with_mode(struct rev_info *revs,
164 struct object *obj,
165 const char *name, unsigned mode)
166{
167 add_pending_object_with_path(revs, obj, name, mode, NULL);
ae563542
LT
168}
169
ff5f5f26
MH
170void add_pending_object(struct rev_info *revs,
171 struct object *obj, const char *name)
2d93b9fa
JH
172{
173 add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
174}
175
3384a2df
JH
176void add_head_to_pending(struct rev_info *revs)
177{
654b9a90 178 struct object_id oid;
3384a2df 179 struct object *obj;
654b9a90 180 if (get_oid("HEAD", &oid))
3384a2df 181 return;
c251c83d 182 obj = parse_object(&oid);
3384a2df
JH
183 if (!obj)
184 return;
185 add_pending_object(revs, obj, "HEAD");
186}
187
ff5f5f26 188static struct object *get_reference(struct rev_info *revs, const char *name,
654b9a90 189 const struct object_id *oid,
ff5f5f26 190 unsigned int flags)
ae563542
LT
191{
192 struct object *object;
193
c251c83d 194 object = parse_object(oid);
cc243c3c
JH
195 if (!object) {
196 if (revs->ignore_missing)
197 return object;
ae563542 198 die("bad object %s", name);
cc243c3c 199 }
cd2bdc53
LT
200 object->flags |= flags;
201 return object;
202}
203
a58a1b01 204void add_pending_oid(struct rev_info *revs, const char *name,
205 const struct object_id *oid, unsigned int flags)
26c3177e 206{
654b9a90 207 struct object *object = get_reference(revs, name, oid, flags);
26c3177e
RS
208 add_pending_object(revs, object, name);
209}
210
ff5f5f26 211static struct commit *handle_commit(struct rev_info *revs,
20739490 212 struct object_array_entry *entry)
cd2bdc53 213{
20739490
JK
214 struct object *object = entry->item;
215 const char *name = entry->name;
216 const char *path = entry->path;
217 unsigned int mode = entry->mode;
cd2bdc53 218 unsigned long flags = object->flags;
ae563542
LT
219
220 /*
221 * Tag object? Look what it points to..
222 */
1974632c 223 while (object->type == OBJ_TAG) {
ae563542 224 struct tag *tag = (struct tag *) object;
cd2bdc53 225 if (revs->tag_objects && !(flags & UNINTERESTING))
ae563542 226 add_pending_object(revs, object, tag->tag);
9684afd9
MK
227 if (!tag->tagged)
228 die("bad tag");
c251c83d 229 object = parse_object(&tag->tagged->oid);
aeeae1b7 230 if (!object) {
a3ba6bf1 231 if (revs->ignore_missing_links || (flags & UNINTERESTING))
aeeae1b7 232 return NULL;
f2fd0760 233 die("bad object %s", oid_to_hex(&tag->tagged->oid));
aeeae1b7 234 }
a7435286 235 object->flags |= flags;
20739490
JK
236 /*
237 * We'll handle the tagged object by looping or dropping
238 * through to the non-tag handlers below. Do not
728350b7 239 * propagate path data from the tag's pending entry.
20739490 240 */
20739490
JK
241 path = NULL;
242 mode = 0;
ae563542
LT
243 }
244
245 /*
246 * Commit object? Just return it, we'll do all the complex
247 * reachability crud.
248 */
1974632c 249 if (object->type == OBJ_COMMIT) {
ae563542 250 struct commit *commit = (struct commit *)object;
ae563542
LT
251 if (parse_commit(commit) < 0)
252 die("unable to parse commit %s", name);
d9a83684 253 if (flags & UNINTERESTING) {
ae563542 254 mark_parents_uninteresting(commit);
d9a83684
LT
255 revs->limited = 1;
256 }
0f3a290b 257 if (revs->show_source && !commit->util)
1da1e07c 258 commit->util = xstrdup(name);
ae563542
LT
259 return commit;
260 }
261
262 /*
3ea3c215 263 * Tree object? Either mark it uninteresting, or add it
ae563542
LT
264 * to the list of objects to look at later..
265 */
1974632c 266 if (object->type == OBJ_TREE) {
ae563542
LT
267 struct tree *tree = (struct tree *)object;
268 if (!revs->tree_objects)
269 return NULL;
270 if (flags & UNINTERESTING) {
2ac5e447 271 mark_tree_contents_uninteresting(tree);
ae563542
LT
272 return NULL;
273 }
20739490 274 add_pending_object_with_path(revs, object, name, mode, path);
ae563542
LT
275 return NULL;
276 }
277
278 /*
279 * Blob object? You know the drill by now..
280 */
1974632c 281 if (object->type == OBJ_BLOB) {
ae563542
LT
282 if (!revs->blob_objects)
283 return NULL;
a7435286 284 if (flags & UNINTERESTING)
ae563542 285 return NULL;
20739490 286 add_pending_object_with_path(revs, object, name, mode, path);
ae563542
LT
287 return NULL;
288 }
289 die("%s is unknown object", name);
290}
291
b6e8a3b5
JK
292static int everybody_uninteresting(struct commit_list *orig,
293 struct commit **interesting_cache)
a4a88b2b
LT
294{
295 struct commit_list *list = orig;
b6e8a3b5
JK
296
297 if (*interesting_cache) {
298 struct commit *commit = *interesting_cache;
299 if (!(commit->object.flags & UNINTERESTING))
300 return 0;
301 }
302
a4a88b2b
LT
303 while (list) {
304 struct commit *commit = list->item;
305 list = list->next;
306 if (commit->object.flags & UNINTERESTING)
307 continue;
ae40ebda
SB
308
309 *interesting_cache = commit;
a4a88b2b
LT
310 return 0;
311 }
312 return 1;
313}
314
4d826608
KB
315/*
316 * A definition of "relevant" commit that we can use to simplify limited graphs
317 * by eliminating side branches.
318 *
319 * A "relevant" commit is one that is !UNINTERESTING (ie we are including it
320 * in our list), or that is a specified BOTTOM commit. Then after computing
321 * a limited list, during processing we can generally ignore boundary merges
322 * coming from outside the graph, (ie from irrelevant parents), and treat
323 * those merges as if they were single-parent. TREESAME is defined to consider
324 * only relevant parents, if any. If we are TREESAME to our on-graph parents,
325 * we don't care if we were !TREESAME to non-graph parents.
326 *
327 * Treating bottom commits as relevant ensures that a limited graph's
328 * connection to the actual bottom commit is not viewed as a side branch, but
329 * treated as part of the graph. For example:
330 *
331 * ....Z...A---X---o---o---B
332 * . /
333 * W---Y
334 *
335 * When computing "A..B", the A-X connection is at least as important as
336 * Y-X, despite A being flagged UNINTERESTING.
337 *
338 * And when computing --ancestry-path "A..B", the A-X connection is more
339 * important than Y-X, despite both A and Y being flagged UNINTERESTING.
340 */
341static inline int relevant_commit(struct commit *commit)
342{
343 return (commit->object.flags & (UNINTERESTING | BOTTOM)) != UNINTERESTING;
344}
345
346/*
347 * Return a single relevant commit from a parent list. If we are a TREESAME
348 * commit, and this selects one of our parents, then we can safely simplify to
349 * that parent.
350 */
351static struct commit *one_relevant_parent(const struct rev_info *revs,
352 struct commit_list *orig)
353{
354 struct commit_list *list = orig;
355 struct commit *relevant = NULL;
356
357 if (!orig)
358 return NULL;
359
360 /*
361 * For 1-parent commits, or if first-parent-only, then return that
362 * first parent (even if not "relevant" by the above definition).
363 * TREESAME will have been set purely on that parent.
364 */
365 if (revs->first_parent_only || !orig->next)
366 return orig->item;
367
368 /*
369 * For multi-parent commits, identify a sole relevant parent, if any.
370 * If we have only one relevant parent, then TREESAME will be set purely
371 * with regard to that parent, and we can simplify accordingly.
372 *
373 * If we have more than one relevant parent, or no relevant parents
374 * (and multiple irrelevant ones), then we can't select a parent here
375 * and return NULL.
376 */
377 while (list) {
378 struct commit *commit = list->item;
379 list = list->next;
380 if (relevant_commit(commit)) {
381 if (relevant)
382 return NULL;
383 relevant = commit;
384 }
385 }
386 return relevant;
387}
388
0a4ba7f8
JH
389/*
390 * The goal is to get REV_TREE_NEW as the result only if the
ceff8e7a
LT
391 * diff consists of all '+' (and no other changes), REV_TREE_OLD
392 * if the whole diff is removal of old data, and otherwise
393 * REV_TREE_DIFFERENT (of course if the trees are the same we
394 * want REV_TREE_SAME).
395 * That means that once we get to REV_TREE_DIFFERENT, we do not
396 * have to look any further.
0a4ba7f8 397 */
8efdc326 398static int tree_difference = REV_TREE_SAME;
a4a88b2b
LT
399
400static void file_add_remove(struct diff_options *options,
401 int addremove, unsigned mode,
c26022ea
BW
402 const struct object_id *oid,
403 int oid_valid,
e3d42c47 404 const char *fullpath, unsigned dirty_submodule)
a4a88b2b 405{
ceff8e7a 406 int diff = addremove == '+' ? REV_TREE_NEW : REV_TREE_OLD;
a4a88b2b 407
ceff8e7a 408 tree_difference |= diff;
dd47aa31 409 if (tree_difference == REV_TREE_DIFFERENT)
8f67f8ae 410 DIFF_OPT_SET(options, HAS_CHANGES);
a4a88b2b
LT
411}
412
413static void file_change(struct diff_options *options,
414 unsigned old_mode, unsigned new_mode,
94a0097a
BW
415 const struct object_id *old_oid,
416 const struct object_id *new_oid,
417 int old_oid_valid, int new_oid_valid,
e3d42c47
JL
418 const char *fullpath,
419 unsigned old_dirty_submodule, unsigned new_dirty_submodule)
a4a88b2b 420{
8efdc326 421 tree_difference = REV_TREE_DIFFERENT;
8f67f8ae 422 DIFF_OPT_SET(options, HAS_CHANGES);
a4a88b2b
LT
423}
424
ff5f5f26
MH
425static int rev_compare_tree(struct rev_info *revs,
426 struct commit *parent, struct commit *commit)
a4a88b2b 427{
3a5e8608
LT
428 struct tree *t1 = parent->tree;
429 struct tree *t2 = commit->tree;
430
a4a88b2b 431 if (!t1)
8efdc326 432 return REV_TREE_NEW;
ceff8e7a
LT
433 if (!t2)
434 return REV_TREE_OLD;
78892e32
LT
435
436 if (revs->simplify_by_decoration) {
437 /*
438 * If we are simplifying by decoration, then the commit
439 * is worth showing if it has a tag pointing at it.
440 */
2608c249 441 if (get_name_decoration(&commit->object))
78892e32
LT
442 return REV_TREE_DIFFERENT;
443 /*
444 * A commit that is not pointed by a tag is uninteresting
445 * if we are not limited by path. This means that you will
446 * see the usual "commits that touch the paths" plus any
447 * tagged commit by specifying both --simplify-by-decoration
448 * and pathspec.
449 */
afe069d1 450 if (!revs->prune_data.nr)
78892e32
LT
451 return REV_TREE_SAME;
452 }
ceff8e7a 453
8efdc326 454 tree_difference = REV_TREE_SAME;
8f67f8ae 455 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
66f414f8 456 if (diff_tree_oid(&t1->object.oid, &t2->object.oid, "",
cd2bdc53 457 &revs->pruning) < 0)
8efdc326 458 return REV_TREE_DIFFERENT;
a4a88b2b
LT
459 return tree_difference;
460}
461
3a5e8608 462static int rev_same_tree_as_empty(struct rev_info *revs, struct commit *commit)
a4a88b2b
LT
463{
464 int retval;
3a5e8608 465 struct tree *t1 = commit->tree;
a4a88b2b
LT
466
467 if (!t1)
468 return 0;
469
0a4ba7f8 470 tree_difference = REV_TREE_SAME;
8f67f8ae 471 DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
66f414f8 472 retval = diff_tree_oid(NULL, &t1->object.oid, "", &revs->pruning);
a4a88b2b 473
0a4ba7f8 474 return retval >= 0 && (tree_difference == REV_TREE_SAME);
a4a88b2b
LT
475}
476
d0af663e
KB
477struct treesame_state {
478 unsigned int nparents;
479 unsigned char treesame[FLEX_ARRAY];
480};
481
482static struct treesame_state *initialise_treesame(struct rev_info *revs, struct commit *commit)
483{
484 unsigned n = commit_list_count(commit->parents);
50a6c8ef 485 struct treesame_state *st = xcalloc(1, st_add(sizeof(*st), n));
d0af663e
KB
486 st->nparents = n;
487 add_decoration(&revs->treesame, &commit->object, st);
488 return st;
489}
490
491/*
492 * Must be called immediately after removing the nth_parent from a commit's
493 * parent list, if we are maintaining the per-parent treesame[] decoration.
494 * This does not recalculate the master TREESAME flag - update_treesame()
495 * should be called to update it after a sequence of treesame[] modifications
496 * that may have affected it.
497 */
498static int compact_treesame(struct rev_info *revs, struct commit *commit, unsigned nth_parent)
499{
500 struct treesame_state *st;
501 int old_same;
502
503 if (!commit->parents) {
504 /*
505 * Have just removed the only parent from a non-merge.
506 * Different handling, as we lack decoration.
507 */
508 if (nth_parent != 0)
509 die("compact_treesame %u", nth_parent);
510 old_same = !!(commit->object.flags & TREESAME);
511 if (rev_same_tree_as_empty(revs, commit))
512 commit->object.flags |= TREESAME;
513 else
514 commit->object.flags &= ~TREESAME;
515 return old_same;
516 }
517
518 st = lookup_decoration(&revs->treesame, &commit->object);
519 if (!st || nth_parent >= st->nparents)
520 die("compact_treesame %u", nth_parent);
521
522 old_same = st->treesame[nth_parent];
523 memmove(st->treesame + nth_parent,
524 st->treesame + nth_parent + 1,
525 st->nparents - nth_parent - 1);
526
527 /*
528 * If we've just become a non-merge commit, update TREESAME
529 * immediately, and remove the no-longer-needed decoration.
530 * If still a merge, defer update until update_treesame().
531 */
532 if (--st->nparents == 1) {
533 if (commit->parents->next)
534 die("compact_treesame parents mismatch");
535 if (st->treesame[0] && revs->dense)
536 commit->object.flags |= TREESAME;
537 else
538 commit->object.flags &= ~TREESAME;
539 free(add_decoration(&revs->treesame, &commit->object, NULL));
540 }
541
542 return old_same;
543}
544
545static unsigned update_treesame(struct rev_info *revs, struct commit *commit)
546{
547 if (commit->parents && commit->parents->next) {
548 unsigned n;
549 struct treesame_state *st;
4d826608
KB
550 struct commit_list *p;
551 unsigned relevant_parents;
552 unsigned relevant_change, irrelevant_change;
d0af663e
KB
553
554 st = lookup_decoration(&revs->treesame, &commit->object);
555 if (!st)
f2fd0760 556 die("update_treesame %s", oid_to_hex(&commit->object.oid));
4d826608
KB
557 relevant_parents = 0;
558 relevant_change = irrelevant_change = 0;
559 for (p = commit->parents, n = 0; p; n++, p = p->next) {
560 if (relevant_commit(p->item)) {
561 relevant_change |= !st->treesame[n];
562 relevant_parents++;
563 } else
564 irrelevant_change |= !st->treesame[n];
d0af663e 565 }
4d826608
KB
566 if (relevant_parents ? relevant_change : irrelevant_change)
567 commit->object.flags &= ~TREESAME;
568 else
569 commit->object.flags |= TREESAME;
d0af663e
KB
570 }
571
572 return commit->object.flags & TREESAME;
573}
574
4d826608
KB
575static inline int limiting_can_increase_treesame(const struct rev_info *revs)
576{
577 /*
578 * TREESAME is irrelevant unless prune && dense;
579 * if simplify_history is set, we can't have a mixture of TREESAME and
580 * !TREESAME INTERESTING parents (and we don't have treesame[]
581 * decoration anyway);
582 * if first_parent_only is set, then the TREESAME flag is locked
583 * against the first parent (and again we lack treesame[] decoration).
584 */
585 return revs->prune && revs->dense &&
586 !revs->simplify_history &&
587 !revs->first_parent_only;
588}
589
a4a88b2b
LT
590static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
591{
592 struct commit_list **pp, *parent;
d0af663e 593 struct treesame_state *ts = NULL;
4d826608
KB
594 int relevant_change = 0, irrelevant_change = 0;
595 int relevant_parents, nth_parent;
a4a88b2b 596
53b2c823
LT
597 /*
598 * If we don't do pruning, everything is interesting
599 */
7dc0fe3b 600 if (!revs->prune)
53b2c823 601 return;
53b2c823 602
a4a88b2b
LT
603 if (!commit->tree)
604 return;
605
606 if (!commit->parents) {
3a5e8608 607 if (rev_same_tree_as_empty(revs, commit))
7dc0fe3b 608 commit->object.flags |= TREESAME;
a4a88b2b
LT
609 return;
610 }
611
53b2c823
LT
612 /*
613 * Normal non-merge commit? If we don't want to make the
614 * history dense, we consider it always to be a change..
615 */
7dc0fe3b 616 if (!revs->dense && !commit->parents->next)
53b2c823 617 return;
53b2c823 618
4d826608 619 for (pp = &commit->parents, nth_parent = 0, relevant_parents = 0;
d0af663e
KB
620 (parent = *pp) != NULL;
621 pp = &parent->next, nth_parent++) {
a4a88b2b 622 struct commit *p = parent->item;
4d826608
KB
623 if (relevant_commit(p))
624 relevant_parents++;
a4a88b2b 625
d0af663e
KB
626 if (nth_parent == 1) {
627 /*
628 * This our second loop iteration - so we now know
629 * we're dealing with a merge.
630 *
631 * Do not compare with later parents when we care only about
632 * the first parent chain, in order to avoid derailing the
633 * traversal to follow a side branch that brought everything
634 * in the path we are limited to by the pathspec.
635 */
636 if (revs->first_parent_only)
637 break;
638 /*
639 * If this will remain a potentially-simplifiable
640 * merge, remember per-parent treesame if needed.
641 * Initialise the array with the comparison from our
642 * first iteration.
643 */
644 if (revs->treesame.name &&
645 !revs->simplify_history &&
646 !(commit->object.flags & UNINTERESTING)) {
647 ts = initialise_treesame(revs, commit);
4d826608 648 if (!(irrelevant_change || relevant_change))
d0af663e
KB
649 ts->treesame[0] = 1;
650 }
651 }
cc0e6c5a
AR
652 if (parse_commit(p) < 0)
653 die("cannot simplify commit %s (because of %s)",
f2fd0760 654 oid_to_hex(&commit->object.oid),
655 oid_to_hex(&p->object.oid));
3a5e8608 656 switch (rev_compare_tree(revs, p, commit)) {
8efdc326 657 case REV_TREE_SAME:
141efdba 658 if (!revs->simplify_history || !relevant_commit(p)) {
f3219fbb
JH
659 /* Even if a merge with an uninteresting
660 * side branch brought the entire change
661 * we are interested in, we do not want
662 * to lose the other branches of this
663 * merge, so we just keep going.
664 */
d0af663e
KB
665 if (ts)
666 ts->treesame[nth_parent] = 1;
f3219fbb
JH
667 continue;
668 }
a4a88b2b
LT
669 parent->next = NULL;
670 commit->parents = parent;
7dc0fe3b 671 commit->object.flags |= TREESAME;
a4a88b2b
LT
672 return;
673
8efdc326
FK
674 case REV_TREE_NEW:
675 if (revs->remove_empty_trees &&
3a5e8608 676 rev_same_tree_as_empty(revs, p)) {
c348f31a
JH
677 /* We are adding all the specified
678 * paths from this parent, so the
679 * history beyond this parent is not
680 * interesting. Remove its parents
681 * (they are grandparents for us).
682 * IOW, we pretend this parent is a
683 * "root" commit.
a41e109c 684 */
cc0e6c5a
AR
685 if (parse_commit(p) < 0)
686 die("cannot simplify commit %s (invalid %s)",
f2fd0760 687 oid_to_hex(&commit->object.oid),
688 oid_to_hex(&p->object.oid));
c348f31a 689 p->parents = NULL;
a4a88b2b
LT
690 }
691 /* fallthrough */
ceff8e7a 692 case REV_TREE_OLD:
8efdc326 693 case REV_TREE_DIFFERENT:
4d826608
KB
694 if (relevant_commit(p))
695 relevant_change = 1;
696 else
697 irrelevant_change = 1;
a4a88b2b
LT
698 continue;
699 }
f2fd0760 700 die("bad tree compare for commit %s", oid_to_hex(&commit->object.oid));
a4a88b2b 701 }
4d826608
KB
702
703 /*
704 * TREESAME is straightforward for single-parent commits. For merge
705 * commits, it is most useful to define it so that "irrelevant"
706 * parents cannot make us !TREESAME - if we have any relevant
707 * parents, then we only consider TREESAMEness with respect to them,
708 * allowing irrelevant merges from uninteresting branches to be
709 * simplified away. Only if we have only irrelevant parents do we
710 * base TREESAME on them. Note that this logic is replicated in
711 * update_treesame, which should be kept in sync.
712 */
713 if (relevant_parents ? !relevant_change : !irrelevant_change)
714 commit->object.flags |= TREESAME;
a4a88b2b
LT
715}
716
47e44ed1 717static void commit_list_insert_by_date_cached(struct commit *p, struct commit_list **head,
fce87ae5
AG
718 struct commit_list *cached_base, struct commit_list **cache)
719{
720 struct commit_list *new_entry;
721
722 if (cached_base && p->date < cached_base->item->date)
47e44ed1 723 new_entry = commit_list_insert_by_date(p, &cached_base->next);
fce87ae5 724 else
47e44ed1 725 new_entry = commit_list_insert_by_date(p, head);
fce87ae5
AG
726
727 if (cache && (!*cache || p->date < (*cache)->item->date))
728 *cache = new_entry;
729}
730
731static int add_parents_to_list(struct rev_info *revs, struct commit *commit,
732 struct commit_list **list, struct commit_list **cache_ptr)
a4a88b2b
LT
733{
734 struct commit_list *parent = commit->parents;
577ed5c2 735 unsigned left_flag;
fce87ae5 736 struct commit_list *cached_base = cache_ptr ? *cache_ptr : NULL;
a4a88b2b 737
3381c790 738 if (commit->object.flags & ADDED)
cc0e6c5a 739 return 0;
3381c790
LT
740 commit->object.flags |= ADDED;
741
a330de31
VM
742 if (revs->include_check &&
743 !revs->include_check(commit, revs->include_check_data))
744 return 0;
745
a4a88b2b
LT
746 /*
747 * If the commit is uninteresting, don't try to
748 * prune parents - we want the maximal uninteresting
749 * set.
750 *
751 * Normally we haven't parsed the parent
752 * yet, so we won't have a parent of a parent
753 * here. However, it may turn out that we've
754 * reached this commit some other way (where it
755 * wasn't uninteresting), in which case we need
756 * to mark its parents recursively too..
757 */
758 if (commit->object.flags & UNINTERESTING) {
759 while (parent) {
760 struct commit *p = parent->item;
761 parent = parent->next;
aeeae1b7
JH
762 if (p)
763 p->object.flags |= UNINTERESTING;
ce4e7b2a 764 if (parse_commit_gently(p, 1) < 0)
aeeae1b7 765 continue;
a4a88b2b
LT
766 if (p->parents)
767 mark_parents_uninteresting(p);
768 if (p->object.flags & SEEN)
769 continue;
770 p->object.flags |= SEEN;
47e44ed1 771 commit_list_insert_by_date_cached(p, list, cached_base, cache_ptr);
a4a88b2b 772 }
cc0e6c5a 773 return 0;
a4a88b2b
LT
774 }
775
776 /*
777 * Ok, the commit wasn't uninteresting. Try to
778 * simplify the commit history and find the parent
779 * that has no differences in the path set if one exists.
780 */
53b2c823 781 try_to_simplify_commit(revs, commit);
a4a88b2b 782
ba1d4505 783 if (revs->no_walk)
cc0e6c5a 784 return 0;
ba1d4505 785
577ed5c2 786 left_flag = (commit->object.flags & SYMMETRIC_LEFT);
0053e902 787
d9c292e8 788 for (parent = commit->parents; parent; parent = parent->next) {
a4a88b2b
LT
789 struct commit *p = parent->item;
790
daf7d867 791 if (parse_commit_gently(p, revs->ignore_missing_links) < 0)
cc0e6c5a 792 return -1;
0f3a290b
LT
793 if (revs->show_source && !p->util)
794 p->util = commit->util;
577ed5c2 795 p->object.flags |= left_flag;
ad1012eb
LH
796 if (!(p->object.flags & SEEN)) {
797 p->object.flags |= SEEN;
47e44ed1 798 commit_list_insert_by_date_cached(p, list, cached_base, cache_ptr);
ad1012eb 799 }
60d30b02 800 if (revs->first_parent_only)
d9c292e8 801 break;
a4a88b2b 802 }
cc0e6c5a 803 return 0;
a4a88b2b
LT
804}
805
36d56de6 806static void cherry_pick_list(struct commit_list *list, struct rev_info *revs)
d7a17cad
JH
807{
808 struct commit_list *p;
809 int left_count = 0, right_count = 0;
810 int left_first;
811 struct patch_ids ids;
adbbb31e 812 unsigned cherry_flag;
d7a17cad
JH
813
814 /* First count the commits on the left and on the right */
815 for (p = list; p; p = p->next) {
816 struct commit *commit = p->item;
817 unsigned flags = commit->object.flags;
818 if (flags & BOUNDARY)
819 ;
820 else if (flags & SYMMETRIC_LEFT)
821 left_count++;
822 else
823 right_count++;
824 }
825
36c07975
TR
826 if (!left_count || !right_count)
827 return;
828
d7a17cad
JH
829 left_first = left_count < right_count;
830 init_patch_ids(&ids);
66f13625 831 ids.diffopts.pathspec = revs->diffopt.pathspec;
d7a17cad
JH
832
833 /* Compute patch-ids for one side */
834 for (p = list; p; p = p->next) {
835 struct commit *commit = p->item;
836 unsigned flags = commit->object.flags;
837
838 if (flags & BOUNDARY)
839 continue;
840 /*
841 * If we have fewer left, left_first is set and we omit
842 * commits on the right branch in this loop. If we have
843 * fewer right, we skip the left ones.
844 */
845 if (left_first != !!(flags & SYMMETRIC_LEFT))
846 continue;
683f17ec 847 add_commit_patch_id(commit, &ids);
d7a17cad
JH
848 }
849
adbbb31e
MG
850 /* either cherry_mark or cherry_pick are true */
851 cherry_flag = revs->cherry_mark ? PATCHSAME : SHOWN;
852
d7a17cad
JH
853 /* Check the other side */
854 for (p = list; p; p = p->next) {
855 struct commit *commit = p->item;
856 struct patch_id *id;
857 unsigned flags = commit->object.flags;
858
859 if (flags & BOUNDARY)
860 continue;
861 /*
862 * If we have fewer left, left_first is set and we omit
863 * commits on the left branch in this loop.
864 */
865 if (left_first == !!(flags & SYMMETRIC_LEFT))
866 continue;
867
868 /*
869 * Have we seen the same patch id?
870 */
871 id = has_commit_patch_id(commit, &ids);
872 if (!id)
873 continue;
d7a17cad 874
683f17ec
KW
875 commit->object.flags |= cherry_flag;
876 id->commit->object.flags |= cherry_flag;
d7a17cad
JH
877 }
878
879 free_patch_ids(&ids);
880}
881
7d004199
LT
882/* How many extra uninteresting commits we want to see.. */
883#define SLOP 5
884
dddbad72 885static int still_interesting(struct commit_list *src, timestamp_t date, int slop,
b6e8a3b5 886 struct commit **interesting_cache)
3131b713 887{
7d004199
LT
888 /*
889 * No source list at all? We're definitely done..
890 */
891 if (!src)
892 return 0;
893
894 /*
895 * Does the destination list contain entries with a date
896 * before the source list? Definitely _not_ done.
897 */
c19d1b4e 898 if (date <= src->item->date)
7d004199
LT
899 return SLOP;
900
901 /*
902 * Does the source list still have interesting commits in
903 * it? Definitely not done..
904 */
b6e8a3b5 905 if (!everybody_uninteresting(src, interesting_cache))
7d004199
LT
906 return SLOP;
907
908 /* Ok, we're closing in.. */
909 return slop-1;
3131b713
LT
910}
911
ebdc94f3
JH
912/*
913 * "rev-list --ancestry-path A..B" computes commits that are ancestors
914 * of B but not ancestors of A but further limits the result to those
915 * that are descendants of A. This takes the list of bottom commits and
916 * the result of "A..B" without --ancestry-path, and limits the latter
917 * further to the ones that can reach one of the commits in "bottom".
918 */
919static void limit_to_ancestry(struct commit_list *bottom, struct commit_list *list)
920{
921 struct commit_list *p;
922 struct commit_list *rlist = NULL;
923 int made_progress;
924
925 /*
926 * Reverse the list so that it will be likely that we would
927 * process parents before children.
928 */
929 for (p = list; p; p = p->next)
930 commit_list_insert(p->item, &rlist);
931
932 for (p = bottom; p; p = p->next)
933 p->item->object.flags |= TMP_MARK;
934
935 /*
936 * Mark the ones that can reach bottom commits in "list",
937 * in a bottom-up fashion.
938 */
939 do {
940 made_progress = 0;
941 for (p = rlist; p; p = p->next) {
942 struct commit *c = p->item;
943 struct commit_list *parents;
944 if (c->object.flags & (TMP_MARK | UNINTERESTING))
945 continue;
946 for (parents = c->parents;
947 parents;
948 parents = parents->next) {
949 if (!(parents->item->object.flags & TMP_MARK))
950 continue;
951 c->object.flags |= TMP_MARK;
952 made_progress = 1;
953 break;
954 }
955 }
956 } while (made_progress);
957
958 /*
959 * NEEDSWORK: decide if we want to remove parents that are
960 * not marked with TMP_MARK from commit->parents for commits
961 * in the resulting list. We may not want to do that, though.
962 */
963
964 /*
965 * The ones that are not marked with TMP_MARK are uninteresting
966 */
967 for (p = list; p; p = p->next) {
968 struct commit *c = p->item;
969 if (c->object.flags & TMP_MARK)
970 continue;
971 c->object.flags |= UNINTERESTING;
972 }
973
974 /* We are done with the TMP_MARK */
975 for (p = list; p; p = p->next)
976 p->item->object.flags &= ~TMP_MARK;
977 for (p = bottom; p; p = p->next)
978 p->item->object.flags &= ~TMP_MARK;
979 free_commit_list(rlist);
980}
981
982/*
983 * Before walking the history, keep the set of "negative" refs the
984 * caller has asked to exclude.
985 *
986 * This is used to compute "rev-list --ancestry-path A..B", as we need
987 * to filter the result of "A..B" further to the ones that can actually
988 * reach A.
989 */
7f34a46f 990static struct commit_list *collect_bottom_commits(struct commit_list *list)
ebdc94f3 991{
7f34a46f
KB
992 struct commit_list *elem, *bottom = NULL;
993 for (elem = list; elem; elem = elem->next)
994 if (elem->item->object.flags & BOTTOM)
995 commit_list_insert(elem->item, &bottom);
ebdc94f3
JH
996 return bottom;
997}
998
60adf7d7
MG
999/* Assumes either left_only or right_only is set */
1000static void limit_left_right(struct commit_list *list, struct rev_info *revs)
1001{
1002 struct commit_list *p;
1003
1004 for (p = list; p; p = p->next) {
1005 struct commit *commit = p->item;
1006
1007 if (revs->right_only) {
1008 if (commit->object.flags & SYMMETRIC_LEFT)
1009 commit->object.flags |= SHOWN;
1010 } else /* revs->left_only is set */
1011 if (!(commit->object.flags & SYMMETRIC_LEFT))
1012 commit->object.flags |= SHOWN;
1013 }
1014}
1015
cc0e6c5a 1016static int limit_list(struct rev_info *revs)
a4a88b2b 1017{
7d004199 1018 int slop = SLOP;
dddbad72 1019 timestamp_t date = TIME_MAX;
a4a88b2b
LT
1020 struct commit_list *list = revs->commits;
1021 struct commit_list *newlist = NULL;
1022 struct commit_list **p = &newlist;
ebdc94f3 1023 struct commit_list *bottom = NULL;
b6e8a3b5 1024 struct commit *interesting_cache = NULL;
ebdc94f3
JH
1025
1026 if (revs->ancestry_path) {
7f34a46f 1027 bottom = collect_bottom_commits(list);
ebdc94f3 1028 if (!bottom)
97b03c35 1029 die("--ancestry-path given but there are no bottom commits");
ebdc94f3 1030 }
a4a88b2b
LT
1031
1032 while (list) {
e510ab89 1033 struct commit *commit = pop_commit(&list);
a4a88b2b 1034 struct object *obj = &commit->object;
cdcefbc9 1035 show_early_output_fn_t show;
a4a88b2b 1036
b6e8a3b5
JK
1037 if (commit == interesting_cache)
1038 interesting_cache = NULL;
1039
a4a88b2b
LT
1040 if (revs->max_age != -1 && (commit->date < revs->max_age))
1041 obj->flags |= UNINTERESTING;
fce87ae5 1042 if (add_parents_to_list(revs, commit, &list, NULL) < 0)
cc0e6c5a 1043 return -1;
a4a88b2b
LT
1044 if (obj->flags & UNINTERESTING) {
1045 mark_parents_uninteresting(commit);
7d004199
LT
1046 if (revs->show_all)
1047 p = &commit_list_insert(commit, p)->next;
b6e8a3b5 1048 slop = still_interesting(list, date, slop, &interesting_cache);
7d004199 1049 if (slop)
3131b713 1050 continue;
7d004199
LT
1051 /* If showing all, add the whole pending list to the end */
1052 if (revs->show_all)
1053 *p = list;
1054 break;
a4a88b2b
LT
1055 }
1056 if (revs->min_age != -1 && (commit->date > revs->min_age))
1057 continue;
7d004199 1058 date = commit->date;
a4a88b2b 1059 p = &commit_list_insert(commit, p)->next;
cdcefbc9
LT
1060
1061 show = show_early_output;
1062 if (!show)
1063 continue;
1064
1065 show(revs, newlist);
1066 show_early_output = NULL;
a4a88b2b 1067 }
adbbb31e 1068 if (revs->cherry_pick || revs->cherry_mark)
36d56de6 1069 cherry_pick_list(newlist, revs);
d7a17cad 1070
60adf7d7
MG
1071 if (revs->left_only || revs->right_only)
1072 limit_left_right(newlist, revs);
1073
ebdc94f3
JH
1074 if (bottom) {
1075 limit_to_ancestry(bottom, newlist);
1076 free_commit_list(bottom);
1077 }
1078
4d826608
KB
1079 /*
1080 * Check if any commits have become TREESAME by some of their parents
1081 * becoming UNINTERESTING.
1082 */
1083 if (limiting_can_increase_treesame(revs))
1084 for (list = newlist; list; list = list->next) {
1085 struct commit *c = list->item;
1086 if (c->object.flags & (UNINTERESTING | TREESAME))
1087 continue;
1088 update_treesame(revs, c);
1089 }
1090
a4a88b2b 1091 revs->commits = newlist;
cc0e6c5a 1092 return 0;
a4a88b2b
LT
1093}
1094
df835d3a
MH
1095/*
1096 * Add an entry to refs->cmdline with the specified information.
1097 * *name is copied.
1098 */
281eee47
JH
1099static void add_rev_cmdline(struct rev_info *revs,
1100 struct object *item,
1101 const char *name,
1102 int whence,
1103 unsigned flags)
1104{
1105 struct rev_cmdline_info *info = &revs->cmdline;
1106 int nr = info->nr;
1107
1108 ALLOC_GROW(info->rev, nr + 1, info->alloc);
1109 info->rev[nr].item = item;
df835d3a 1110 info->rev[nr].name = xstrdup(name);
281eee47
JH
1111 info->rev[nr].whence = whence;
1112 info->rev[nr].flags = flags;
1113 info->nr++;
1114}
1115
a765499a
KB
1116static void add_rev_cmdline_list(struct rev_info *revs,
1117 struct commit_list *commit_list,
1118 int whence,
1119 unsigned flags)
1120{
1121 while (commit_list) {
1122 struct object *object = &commit_list->item->object;
f2fd0760 1123 add_rev_cmdline(revs, object, oid_to_hex(&object->oid),
a765499a
KB
1124 whence, flags);
1125 commit_list = commit_list->next;
1126 }
1127}
1128
63049292
JH
1129struct all_refs_cb {
1130 int all_flags;
71b03b42 1131 int warned_bad_reflog;
63049292
JH
1132 struct rev_info *all_revs;
1133 const char *name_for_errormsg;
1134};
ae563542 1135
ff32d342 1136int ref_excluded(struct string_list *ref_excludes, const char *path)
e7b432c5
JH
1137{
1138 struct string_list_item *item;
1139
ff32d342 1140 if (!ref_excludes)
e7b432c5 1141 return 0;
ff32d342 1142 for_each_string_list_item(item, ref_excludes) {
eb07894f 1143 if (!wildmatch(item->string, path, 0, NULL))
e7b432c5
JH
1144 return 1;
1145 }
1146 return 0;
1147}
1148
a217dcbd
MH
1149static int handle_one_ref(const char *path, const struct object_id *oid,
1150 int flag, void *cb_data)
ae563542 1151{
63049292 1152 struct all_refs_cb *cb = cb_data;
e7b432c5
JH
1153 struct object *object;
1154
ff32d342 1155 if (ref_excluded(cb->all_revs->ref_excludes, path))
e7b432c5
JH
1156 return 0;
1157
654b9a90 1158 object = get_reference(cb->all_revs, path, oid, cb->all_flags);
281eee47 1159 add_rev_cmdline(cb->all_revs, object, path, REV_CMD_REF, cb->all_flags);
a58a1b01 1160 add_pending_oid(cb->all_revs, path, oid, cb->all_flags);
ae563542
LT
1161 return 0;
1162}
1163
d08bae7e
IL
1164static void init_all_refs_cb(struct all_refs_cb *cb, struct rev_info *revs,
1165 unsigned flags)
1166{
1167 cb->all_revs = revs;
1168 cb->all_flags = flags;
1169}
1170
ff32d342 1171void clear_ref_exclusion(struct string_list **ref_excludes_p)
e7b432c5 1172{
ff32d342
JH
1173 if (*ref_excludes_p) {
1174 string_list_clear(*ref_excludes_p, 0);
1175 free(*ref_excludes_p);
e7b432c5 1176 }
ff32d342 1177 *ref_excludes_p = NULL;
e7b432c5
JH
1178}
1179
ff32d342 1180void add_ref_exclusion(struct string_list **ref_excludes_p, const char *exclude)
e7b432c5 1181{
ff32d342
JH
1182 if (!*ref_excludes_p) {
1183 *ref_excludes_p = xcalloc(1, sizeof(**ref_excludes_p));
1184 (*ref_excludes_p)->strdup_strings = 1;
e7b432c5 1185 }
ff32d342 1186 string_list_append(*ref_excludes_p, exclude);
e7b432c5
JH
1187}
1188
9ef6aeb0
HV
1189static void handle_refs(const char *submodule, struct rev_info *revs, unsigned flags,
1190 int (*for_each)(const char *, each_ref_fn, void *))
ae563542 1191{
63049292 1192 struct all_refs_cb cb;
d08bae7e 1193 init_all_refs_cb(&cb, revs, flags);
a217dcbd 1194 for_each(submodule, handle_one_ref, &cb);
63049292
JH
1195}
1196
9461d272 1197static void handle_one_reflog_commit(struct object_id *oid, void *cb_data)
63049292
JH
1198{
1199 struct all_refs_cb *cb = cb_data;
9461d272 1200 if (!is_null_oid(oid)) {
c251c83d 1201 struct object *o = parse_object(oid);
71b03b42
SP
1202 if (o) {
1203 o->flags |= cb->all_flags;
281eee47 1204 /* ??? CMDLINEFLAGS ??? */
71b03b42
SP
1205 add_pending_object(cb->all_revs, o, "");
1206 }
1207 else if (!cb->warned_bad_reflog) {
46efd2d9 1208 warning("reflog of '%s' references pruned commits",
71b03b42
SP
1209 cb->name_for_errormsg);
1210 cb->warned_bad_reflog = 1;
1211 }
63049292 1212 }
71b03b42
SP
1213}
1214
9461d272 1215static int handle_one_reflog_ent(struct object_id *ooid, struct object_id *noid,
dddbad72 1216 const char *email, timestamp_t timestamp, int tz,
883d60fa 1217 const char *message, void *cb_data)
71b03b42 1218{
9461d272 1219 handle_one_reflog_commit(ooid, cb_data);
1220 handle_one_reflog_commit(noid, cb_data);
63049292
JH
1221 return 0;
1222}
1223
a89caf4b
MH
1224static int handle_one_reflog(const char *path, const struct object_id *oid,
1225 int flag, void *cb_data)
63049292
JH
1226{
1227 struct all_refs_cb *cb = cb_data;
71b03b42 1228 cb->warned_bad_reflog = 0;
63049292
JH
1229 cb->name_for_errormsg = path;
1230 for_each_reflog_ent(path, handle_one_reflog_ent, cb_data);
1231 return 0;
1232}
1233
718ccc97 1234void add_reflogs_to_pending(struct rev_info *revs, unsigned flags)
63049292
JH
1235{
1236 struct all_refs_cb cb;
2b2a5be3 1237
63049292
JH
1238 cb.all_revs = revs;
1239 cb.all_flags = flags;
a89caf4b 1240 for_each_reflog(handle_one_reflog, &cb);
ae563542
LT
1241}
1242
4fe10219
JK
1243static void add_cache_tree(struct cache_tree *it, struct rev_info *revs,
1244 struct strbuf *path)
1245{
1246 size_t baselen = path->len;
1247 int i;
1248
1249 if (it->entry_count >= 0) {
740ee055 1250 struct tree *tree = lookup_tree(&it->oid);
4fe10219
JK
1251 add_pending_object_with_path(revs, &tree->object, "",
1252 040000, path->buf);
1253 }
1254
1255 for (i = 0; i < it->subtree_nr; i++) {
1256 struct cache_tree_sub *sub = it->down[i];
1257 strbuf_addf(path, "%s%s", baselen ? "/" : "", sub->name);
1258 add_cache_tree(sub->cache_tree, revs, path);
1259 strbuf_setlen(path, baselen);
1260 }
1261
1262}
1263
1264void add_index_objects_to_pending(struct rev_info *revs, unsigned flags)
1265{
1266 int i;
1267
1268 read_cache();
1269 for (i = 0; i < active_nr; i++) {
1270 struct cache_entry *ce = active_cache[i];
1271 struct blob *blob;
1272
1273 if (S_ISGITLINK(ce->ce_mode))
1274 continue;
1275
3aca1fc6 1276 blob = lookup_blob(&ce->oid);
4fe10219
JK
1277 if (!blob)
1278 die("unable to add index blob to traversal");
1279 add_pending_object_with_path(revs, &blob->object, "",
1280 ce->ce_mode, ce->name);
1281 }
1282
1283 if (active_cache_tree) {
1284 struct strbuf path = STRBUF_INIT;
1285 add_cache_tree(active_cache_tree, revs, &path);
1286 strbuf_release(&path);
1287 }
1288}
1289
8779351d
VN
1290static int add_parents_only(struct rev_info *revs, const char *arg_, int flags,
1291 int exclude_parent)
ea4a19e1 1292{
654b9a90 1293 struct object_id oid;
ea4a19e1
JH
1294 struct object *it;
1295 struct commit *commit;
1296 struct commit_list *parents;
8779351d 1297 int parent_number;
281eee47 1298 const char *arg = arg_;
ea4a19e1
JH
1299
1300 if (*arg == '^') {
7f34a46f 1301 flags ^= UNINTERESTING | BOTTOM;
ea4a19e1
JH
1302 arg++;
1303 }
654b9a90 1304 if (get_sha1_committish(arg, oid.hash))
ea4a19e1
JH
1305 return 0;
1306 while (1) {
654b9a90 1307 it = get_reference(revs, arg, &oid, 0);
cc243c3c
JH
1308 if (!it && revs->ignore_missing)
1309 return 0;
1974632c 1310 if (it->type != OBJ_TAG)
ea4a19e1 1311 break;
9684afd9
MK
1312 if (!((struct tag*)it)->tagged)
1313 return 0;
654b9a90 1314 oidcpy(&oid, &((struct tag*)it)->tagged->oid);
ea4a19e1 1315 }
1974632c 1316 if (it->type != OBJ_COMMIT)
ea4a19e1
JH
1317 return 0;
1318 commit = (struct commit *)it;
8779351d
VN
1319 if (exclude_parent &&
1320 exclude_parent > commit_list_count(commit->parents))
1321 return 0;
1322 for (parents = commit->parents, parent_number = 1;
1323 parents;
1324 parents = parents->next, parent_number++) {
1325 if (exclude_parent && parent_number != exclude_parent)
1326 continue;
1327
ea4a19e1
JH
1328 it = &parents->item->object;
1329 it->flags |= flags;
281eee47 1330 add_rev_cmdline(revs, it, arg_, REV_CMD_PARENTS_ONLY, flags);
ea4a19e1
JH
1331 add_pending_object(revs, it, arg);
1332 }
1333 return 1;
1334}
1335
db6296a5 1336void init_revisions(struct rev_info *revs, const char *prefix)
8efdc326
FK
1337{
1338 memset(revs, 0, sizeof(*revs));
8e8f9987 1339
6b9c58f4 1340 revs->abbrev = DEFAULT_ABBREV;
8e8f9987 1341 revs->ignore_merges = 1;
9202434c 1342 revs->simplify_history = 1;
8f67f8ae 1343 DIFF_OPT_SET(&revs->pruning, RECURSIVE);
90b19941 1344 DIFF_OPT_SET(&revs->pruning, QUICK);
cd2bdc53
LT
1345 revs->pruning.add_remove = file_add_remove;
1346 revs->pruning.change = file_change;
08f704f2 1347 revs->sort_order = REV_SORT_IN_GRAPH_ORDER;
8efdc326 1348 revs->dense = 1;
db6296a5 1349 revs->prefix = prefix;
8efdc326
FK
1350 revs->max_age = -1;
1351 revs->min_age = -1;
d5db6c9e 1352 revs->skip_count = -1;
8efdc326 1353 revs->max_count = -1;
ad5aeede 1354 revs->max_parents = -1;
0893eec8 1355 revs->expand_tabs_in_log = -1;
8efdc326 1356
cd2bdc53 1357 revs->commit_format = CMIT_FMT_DEFAULT;
fe37a9c5 1358 revs->expand_tabs_in_log_default = 8;
cd2bdc53 1359
918d4e1c
JH
1360 init_grep_defaults();
1361 grep_init(&revs->grep_filter, prefix);
0843acfd 1362 revs->grep_filter.status_only = 1;
0843acfd
JK
1363 revs->grep_filter.regflags = REG_NEWLINE;
1364
cd2bdc53 1365 diff_setup(&revs->diffopt);
c0cb4a06 1366 if (prefix && !revs->diffopt.prefix) {
cd676a51
JH
1367 revs->diffopt.prefix = prefix;
1368 revs->diffopt.prefix_length = strlen(prefix);
1369 }
3a03cf6b
JK
1370
1371 revs->notes_opt.use_default_notes = -1;
8efdc326
FK
1372}
1373
0d2c9d67
RS
1374static void add_pending_commit_list(struct rev_info *revs,
1375 struct commit_list *commit_list,
1376 unsigned int flags)
1377{
1378 while (commit_list) {
1379 struct object *object = &commit_list->item->object;
1380 object->flags |= flags;
f2fd0760 1381 add_pending_object(revs, object, oid_to_hex(&object->oid));
0d2c9d67
RS
1382 commit_list = commit_list->next;
1383 }
1384}
1385
ae3e5e1e
JH
1386static void prepare_show_merge(struct rev_info *revs)
1387{
1388 struct commit_list *bases;
1389 struct commit *head, *other;
68ab61dd 1390 struct object_id oid;
ae3e5e1e
JH
1391 const char **prune = NULL;
1392 int i, prune_num = 1; /* counting terminating NULL */
1393
68ab61dd 1394 if (get_oid("HEAD", &oid))
ae3e5e1e 1395 die("--merge without HEAD?");
bc83266a 1396 head = lookup_commit_or_die(&oid, "HEAD");
68ab61dd 1397 if (get_oid("MERGE_HEAD", &oid))
ae3e5e1e 1398 die("--merge without MERGE_HEAD?");
bc83266a 1399 other = lookup_commit_or_die(&oid, "MERGE_HEAD");
ae3e5e1e
JH
1400 add_pending_object(revs, &head->object, "HEAD");
1401 add_pending_object(revs, &other->object, "MERGE_HEAD");
2ce406cc 1402 bases = get_merge_bases(head, other);
7f34a46f
KB
1403 add_rev_cmdline_list(revs, bases, REV_CMD_MERGE_BASE, UNINTERESTING | BOTTOM);
1404 add_pending_commit_list(revs, bases, UNINTERESTING | BOTTOM);
e82447b1
JH
1405 free_commit_list(bases);
1406 head->object.flags |= SYMMETRIC_LEFT;
ae3e5e1e
JH
1407
1408 if (!active_nr)
1409 read_cache();
1410 for (i = 0; i < active_nr; i++) {
9c5e6c80 1411 const struct cache_entry *ce = active_cache[i];
ae3e5e1e
JH
1412 if (!ce_stage(ce))
1413 continue;
429bb40a 1414 if (ce_path_match(ce, &revs->prune_data, NULL)) {
ae3e5e1e 1415 prune_num++;
2756ca43 1416 REALLOC_ARRAY(prune, prune_num);
ae3e5e1e
JH
1417 prune[prune_num-2] = ce->name;
1418 prune[prune_num-1] = NULL;
1419 }
1420 while ((i+1 < active_nr) &&
1421 ce_same_name(ce, active_cache[i+1]))
1422 i++;
1423 }
ed6e8038 1424 clear_pathspec(&revs->prune_data);
4a2d5ae2 1425 parse_pathspec(&revs->prune_data, PATHSPEC_ALL_MAGIC & ~PATHSPEC_LITERAL,
c6f1b920 1426 PATHSPEC_PREFER_FULL | PATHSPEC_LITERAL_PATH, "", prune);
e82447b1 1427 revs->limited = 1;
ae3e5e1e
JH
1428}
1429
62faad5a
JK
1430static int dotdot_missing(const char *arg, char *dotdot,
1431 struct rev_info *revs, int symmetric)
1432{
1433 if (revs->ignore_missing)
1434 return 0;
1435 /* de-munge so we report the full argument */
1436 *dotdot = '.';
1437 die(symmetric
1438 ? "Invalid symmetric difference expression %s"
1439 : "Invalid revision range %s", arg);
1440}
1441
1442static int handle_dotdot_1(const char *arg, char *dotdot,
1443 struct rev_info *revs, int flags,
18f1ad76
JK
1444 int cant_be_filename,
1445 struct object_context *a_oc,
1446 struct object_context *b_oc)
62faad5a
JK
1447{
1448 const char *a_name, *b_name;
1449 struct object_id a_oid, b_oid;
1450 struct object *a_obj, *b_obj;
1451 unsigned int a_flags, b_flags;
1452 int symmetric = 0;
1453 unsigned int flags_exclude = flags ^ (UNINTERESTING | BOTTOM);
18f1ad76 1454 unsigned int oc_flags = GET_SHA1_COMMITTISH | GET_SHA1_RECORD_PATH;
62faad5a
JK
1455
1456 a_name = arg;
1457 if (!*a_name)
1458 a_name = "HEAD";
1459
1460 b_name = dotdot + 2;
1461 if (*b_name == '.') {
1462 symmetric = 1;
1463 b_name++;
1464 }
1465 if (!*b_name)
1466 b_name = "HEAD";
1467
18f1ad76
JK
1468 if (get_sha1_with_context(a_name, oc_flags, a_oid.hash, a_oc) ||
1469 get_sha1_with_context(b_name, oc_flags, b_oid.hash, b_oc))
62faad5a
JK
1470 return -1;
1471
1472 if (!cant_be_filename) {
1473 *dotdot = '.';
1474 verify_non_filename(revs->prefix, arg);
1475 *dotdot = '\0';
1476 }
1477
7ef0d047
JH
1478 a_obj = parse_object(&a_oid);
1479 b_obj = parse_object(&b_oid);
62faad5a
JK
1480 if (!a_obj || !b_obj)
1481 return dotdot_missing(arg, dotdot, revs, symmetric);
1482
1483 if (!symmetric) {
1484 /* just A..B */
1485 b_flags = flags;
1486 a_flags = flags_exclude;
1487 } else {
1488 /* A...B -- find merge bases between the two */
1489 struct commit *a, *b;
1490 struct commit_list *exclude;
1491
7ef0d047
JH
1492 a = lookup_commit_reference(&a_obj->oid);
1493 b = lookup_commit_reference(&b_obj->oid);
62faad5a
JK
1494 if (!a || !b)
1495 return dotdot_missing(arg, dotdot, revs, symmetric);
1496
1497 exclude = get_merge_bases(a, b);
1498 add_rev_cmdline_list(revs, exclude, REV_CMD_MERGE_BASE,
1499 flags_exclude);
1500 add_pending_commit_list(revs, exclude, flags_exclude);
1501 free_commit_list(exclude);
1502
1503 b_flags = flags;
1504 a_flags = flags | SYMMETRIC_LEFT;
1505 }
1506
1507 a_obj->flags |= a_flags;
1508 b_obj->flags |= b_flags;
1509 add_rev_cmdline(revs, a_obj, a_name, REV_CMD_LEFT, a_flags);
1510 add_rev_cmdline(revs, b_obj, b_name, REV_CMD_RIGHT, b_flags);
18f1ad76
JK
1511 add_pending_object_with_path(revs, a_obj, a_name, a_oc->mode, a_oc->path);
1512 add_pending_object_with_path(revs, b_obj, b_name, b_oc->mode, b_oc->path);
62faad5a
JK
1513 return 0;
1514}
1515
1516static int handle_dotdot(const char *arg,
1517 struct rev_info *revs, int flags,
1518 int cant_be_filename)
1519{
18f1ad76 1520 struct object_context a_oc, b_oc;
62faad5a
JK
1521 char *dotdot = strstr(arg, "..");
1522 int ret;
1523
1524 if (!dotdot)
1525 return -1;
1526
18f1ad76
JK
1527 memset(&a_oc, 0, sizeof(a_oc));
1528 memset(&b_oc, 0, sizeof(b_oc));
1529
62faad5a 1530 *dotdot = '\0';
18f1ad76
JK
1531 ret = handle_dotdot_1(arg, dotdot, revs, flags, cant_be_filename,
1532 &a_oc, &b_oc);
62faad5a
JK
1533 *dotdot = '.';
1534
18f1ad76
JK
1535 free(a_oc.path);
1536 free(b_oc.path);
1537
62faad5a
JK
1538 return ret;
1539}
1540
8e676e8b 1541int handle_revision_arg(const char *arg_, struct rev_info *revs, int flags, unsigned revarg_opt)
5d6f0935 1542{
249c8f4a 1543 struct object_context oc;
f632dedd 1544 char *mark;
5d6f0935 1545 struct object *object;
654b9a90 1546 struct object_id oid;
5d6f0935 1547 int local_flags;
281eee47 1548 const char *arg = arg_;
8e676e8b 1549 int cant_be_filename = revarg_opt & REVARG_CANNOT_BE_FILENAME;
18f1ad76 1550 unsigned get_sha1_flags = GET_SHA1_RECORD_PATH;
5d6f0935 1551
7f34a46f
KB
1552 flags = flags & UNINTERESTING ? flags | BOTTOM : flags & ~BOTTOM;
1553
d89797fe
JK
1554 if (!cant_be_filename && !strcmp(arg, "..")) {
1555 /*
1556 * Just ".."? That is not a range but the
1557 * pathspec for the parent directory.
1558 */
1559 return -1;
5d6f0935 1560 }
8779351d 1561
62faad5a
JK
1562 if (!handle_dotdot(arg, revs, flags, revarg_opt))
1563 return 0;
8779351d 1564
f632dedd
JK
1565 mark = strstr(arg, "^@");
1566 if (mark && !mark[2]) {
1567 *mark = 0;
8779351d 1568 if (add_parents_only(revs, arg, flags, 0))
5d6f0935 1569 return 0;
f632dedd 1570 *mark = '^';
5d6f0935 1571 }
f632dedd
JK
1572 mark = strstr(arg, "^!");
1573 if (mark && !mark[2]) {
1574 *mark = 0;
8779351d 1575 if (!add_parents_only(revs, arg, flags ^ (UNINTERESTING | BOTTOM), 0))
f632dedd 1576 *mark = '^';
8779351d 1577 }
f632dedd
JK
1578 mark = strstr(arg, "^-");
1579 if (mark) {
8779351d
VN
1580 int exclude_parent = 1;
1581
f632dedd 1582 if (mark[2]) {
8779351d 1583 char *end;
f632dedd 1584 exclude_parent = strtoul(mark + 2, &end, 10);
8779351d
VN
1585 if (*end != '\0' || !exclude_parent)
1586 return -1;
1587 }
1588
f632dedd 1589 *mark = 0;
8779351d 1590 if (!add_parents_only(revs, arg, flags ^ (UNINTERESTING | BOTTOM), exclude_parent))
f632dedd 1591 *mark = '^';
62476c8e
JH
1592 }
1593
5d6f0935
JH
1594 local_flags = 0;
1595 if (*arg == '^') {
7f34a46f 1596 local_flags = UNINTERESTING | BOTTOM;
5d6f0935
JH
1597 arg++;
1598 }
d5f6b1d7
JH
1599
1600 if (revarg_opt & REVARG_COMMITTISH)
18f1ad76 1601 get_sha1_flags |= GET_SHA1_COMMITTISH;
d5f6b1d7 1602
654b9a90 1603 if (get_sha1_with_context(arg, get_sha1_flags, oid.hash, &oc))
cc243c3c 1604 return revs->ignore_missing ? 0 : -1;
5d6f0935
JH
1605 if (!cant_be_filename)
1606 verify_non_filename(revs->prefix, arg);
654b9a90 1607 object = get_reference(revs, arg, &oid, flags ^ local_flags);
281eee47 1608 add_rev_cmdline(revs, object, arg_, REV_CMD_REV, flags ^ local_flags);
18f1ad76
JK
1609 add_pending_object_with_path(revs, object, arg, oc.mode, oc.path);
1610 free(oc.path);
5d6f0935
JH
1611 return 0;
1612}
1613
4da5af31
JH
1614struct cmdline_pathspec {
1615 int alloc;
1616 int nr;
1617 const char **path;
1618};
1fc561d1 1619
4da5af31
JH
1620static void append_prune_data(struct cmdline_pathspec *prune, const char **av)
1621{
1622 while (*av) {
9e57ac55 1623 ALLOC_GROW(prune->path, prune->nr + 1, prune->alloc);
4da5af31
JH
1624 prune->path[prune->nr++] = *(av++);
1625 }
1626}
60da8b15 1627
4da5af31
JH
1628static void read_pathspec_from_stdin(struct rev_info *revs, struct strbuf *sb,
1629 struct cmdline_pathspec *prune)
1630{
6e8d46f9 1631 while (strbuf_getline(sb, stdin) != EOF) {
9e57ac55 1632 ALLOC_GROW(prune->path, prune->nr + 1, prune->alloc);
4da5af31 1633 prune->path[prune->nr++] = xstrdup(sb->buf);
60da8b15 1634 }
60da8b15
JH
1635}
1636
4da5af31
JH
1637static void read_revisions_from_stdin(struct rev_info *revs,
1638 struct cmdline_pathspec *prune)
1fc561d1 1639{
63d564b3 1640 struct strbuf sb;
60da8b15 1641 int seen_dashdash = 0;
4c30d504
JK
1642 int save_warning;
1643
1644 save_warning = warn_on_object_refname_ambiguity;
1645 warn_on_object_refname_ambiguity = 0;
1fc561d1 1646
63d564b3 1647 strbuf_init(&sb, 1000);
6e8d46f9 1648 while (strbuf_getline(&sb, stdin) != EOF) {
63d564b3 1649 int len = sb.len;
1fc561d1
AB
1650 if (!len)
1651 break;
60da8b15
JH
1652 if (sb.buf[0] == '-') {
1653 if (len == 2 && sb.buf[1] == '-') {
1654 seen_dashdash = 1;
1655 break;
1656 }
1fc561d1 1657 die("options not supported in --stdin mode");
60da8b15 1658 }
31faeb20 1659 if (handle_revision_arg(sb.buf, revs, 0,
70d26c6e 1660 REVARG_CANNOT_BE_FILENAME))
63d564b3 1661 die("bad revision '%s'", sb.buf);
1fc561d1 1662 }
60da8b15
JH
1663 if (seen_dashdash)
1664 read_pathspec_from_stdin(revs, &sb, prune);
4c30d504 1665
63d564b3 1666 strbuf_release(&sb);
4c30d504 1667 warn_on_object_refname_ambiguity = save_warning;
1fc561d1
AB
1668}
1669
2d10c555 1670static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
bd95fcd3 1671{
0843acfd 1672 append_grep_pattern(&revs->grep_filter, ptn, "command line", 0, what);
2d10c555
JH
1673}
1674
a4d7d2c6 1675static void add_header_grep(struct rev_info *revs, enum grep_header_field field, const char *pattern)
2d10c555 1676{
a4d7d2c6 1677 append_header_grep_pattern(&revs->grep_filter, field, pattern);
bd95fcd3
JH
1678}
1679
1680static void add_message_grep(struct rev_info *revs, const char *pattern)
1681{
2d10c555 1682 add_grep(revs, pattern, GREP_PATTERN_BODY);
bd95fcd3
JH
1683}
1684
6b61ec05
PH
1685static int handle_revision_opt(struct rev_info *revs, int argc, const char **argv,
1686 int *unkc, const char **unkv)
02e54220
PH
1687{
1688 const char *arg = argv[0];
7d7b86f7
MM
1689 const char *optarg;
1690 int argcount;
02e54220
PH
1691
1692 /* pseudo revision arguments */
1693 if (!strcmp(arg, "--all") || !strcmp(arg, "--branches") ||
1694 !strcmp(arg, "--tags") || !strcmp(arg, "--remotes") ||
1695 !strcmp(arg, "--reflog") || !strcmp(arg, "--not") ||
ad3f9a71 1696 !strcmp(arg, "--no-walk") || !strcmp(arg, "--do-walk") ||
59556548 1697 !strcmp(arg, "--bisect") || starts_with(arg, "--glob=") ||
4fe10219 1698 !strcmp(arg, "--indexed-objects") ||
07768e03 1699 starts_with(arg, "--exclude=") ||
59556548
CC
1700 starts_with(arg, "--branches=") || starts_with(arg, "--tags=") ||
1701 starts_with(arg, "--remotes=") || starts_with(arg, "--no-walk="))
02e54220
PH
1702 {
1703 unkv[(*unkc)++] = arg;
0fe8c138 1704 return 1;
02e54220
PH
1705 }
1706
7d7b86f7
MM
1707 if ((argcount = parse_long_opt("max-count", argv, &optarg))) {
1708 revs->max_count = atoi(optarg);
5853caec 1709 revs->no_walk = 0;
7d7b86f7
MM
1710 return argcount;
1711 } else if ((argcount = parse_long_opt("skip", argv, &optarg))) {
1712 revs->skip_count = atoi(optarg);
1713 return argcount;
02e54220 1714 } else if ((*arg == '-') && isdigit(arg[1])) {
e3fa568c
JH
1715 /* accept -<digit>, like traditional "head" */
1716 if (strtol_i(arg + 1, 10, &revs->max_count) < 0 ||
1717 revs->max_count < 0)
1718 die("'%s': not a non-negative integer", arg + 1);
5853caec 1719 revs->no_walk = 0;
02e54220
PH
1720 } else if (!strcmp(arg, "-n")) {
1721 if (argc <= 1)
1722 return error("-n requires an argument");
1723 revs->max_count = atoi(argv[1]);
5853caec 1724 revs->no_walk = 0;
02e54220 1725 return 2;
479b3d97
SG
1726 } else if (skip_prefix(arg, "-n", &optarg)) {
1727 revs->max_count = atoi(optarg);
5853caec 1728 revs->no_walk = 0;
7d7b86f7
MM
1729 } else if ((argcount = parse_long_opt("max-age", argv, &optarg))) {
1730 revs->max_age = atoi(optarg);
1731 return argcount;
1732 } else if ((argcount = parse_long_opt("since", argv, &optarg))) {
1733 revs->max_age = approxidate(optarg);
1734 return argcount;
1735 } else if ((argcount = parse_long_opt("after", argv, &optarg))) {
1736 revs->max_age = approxidate(optarg);
1737 return argcount;
1738 } else if ((argcount = parse_long_opt("min-age", argv, &optarg))) {
1739 revs->min_age = atoi(optarg);
1740 return argcount;
1741 } else if ((argcount = parse_long_opt("before", argv, &optarg))) {
1742 revs->min_age = approxidate(optarg);
1743 return argcount;
1744 } else if ((argcount = parse_long_opt("until", argv, &optarg))) {
1745 revs->min_age = approxidate(optarg);
1746 return argcount;
02e54220
PH
1747 } else if (!strcmp(arg, "--first-parent")) {
1748 revs->first_parent_only = 1;
ebdc94f3
JH
1749 } else if (!strcmp(arg, "--ancestry-path")) {
1750 revs->ancestry_path = 1;
cb7529e1 1751 revs->simplify_history = 0;
ebdc94f3 1752 revs->limited = 1;
02e54220
PH
1753 } else if (!strcmp(arg, "-g") || !strcmp(arg, "--walk-reflogs")) {
1754 init_reflog_walk(&revs->reflog_info);
1755 } else if (!strcmp(arg, "--default")) {
1756 if (argc <= 1)
1757 return error("bad --default argument");
1758 revs->def = argv[1];
1759 return 2;
1760 } else if (!strcmp(arg, "--merge")) {
1761 revs->show_merge = 1;
1762 } else if (!strcmp(arg, "--topo-order")) {
08f704f2 1763 revs->sort_order = REV_SORT_IN_GRAPH_ORDER;
02e54220 1764 revs->topo_order = 1;
6546b593
JH
1765 } else if (!strcmp(arg, "--simplify-merges")) {
1766 revs->simplify_merges = 1;
a52f0071 1767 revs->topo_order = 1;
6546b593
JH
1768 revs->rewrite_parents = 1;
1769 revs->simplify_history = 0;
1770 revs->limited = 1;
78892e32
LT
1771 } else if (!strcmp(arg, "--simplify-by-decoration")) {
1772 revs->simplify_merges = 1;
a52f0071 1773 revs->topo_order = 1;
78892e32
LT
1774 revs->rewrite_parents = 1;
1775 revs->simplify_history = 0;
1776 revs->simplify_by_decoration = 1;
1777 revs->limited = 1;
1778 revs->prune = 1;
33e7018c 1779 load_ref_decorations(DECORATE_SHORT_REFS);
02e54220 1780 } else if (!strcmp(arg, "--date-order")) {
08f704f2 1781 revs->sort_order = REV_SORT_BY_COMMIT_DATE;
02e54220 1782 revs->topo_order = 1;
81c6b38b
JH
1783 } else if (!strcmp(arg, "--author-date-order")) {
1784 revs->sort_order = REV_SORT_BY_AUTHOR_DATE;
02e54220 1785 revs->topo_order = 1;
dffc651e
SG
1786 } else if (!strcmp(arg, "--early-output")) {
1787 revs->early_output = 100;
1788 revs->topo_order = 1;
1789 } else if (skip_prefix(arg, "--early-output=", &optarg)) {
1790 if (strtoul_ui(optarg, 10, &revs->early_output) < 0)
1791 die("'%s': not a non-negative integer", optarg);
1792 revs->topo_order = 1;
02e54220
PH
1793 } else if (!strcmp(arg, "--parents")) {
1794 revs->rewrite_parents = 1;
1795 revs->print_parents = 1;
1796 } else if (!strcmp(arg, "--dense")) {
1797 revs->dense = 1;
1798 } else if (!strcmp(arg, "--sparse")) {
1799 revs->dense = 0;
1800 } else if (!strcmp(arg, "--show-all")) {
1801 revs->show_all = 1;
1802 } else if (!strcmp(arg, "--remove-empty")) {
1803 revs->remove_empty_trees = 1;
b8e8db28 1804 } else if (!strcmp(arg, "--merges")) {
ad5aeede 1805 revs->min_parents = 2;
02e54220 1806 } else if (!strcmp(arg, "--no-merges")) {
ad5aeede 1807 revs->max_parents = 1;
479b3d97
SG
1808 } else if (skip_prefix(arg, "--min-parents=", &optarg)) {
1809 revs->min_parents = atoi(optarg);
9ada7aee 1810 } else if (!strcmp(arg, "--no-min-parents")) {
ad5aeede 1811 revs->min_parents = 0;
479b3d97
SG
1812 } else if (skip_prefix(arg, "--max-parents=", &optarg)) {
1813 revs->max_parents = atoi(optarg);
9ada7aee 1814 } else if (!strcmp(arg, "--no-max-parents")) {
ad5aeede 1815 revs->max_parents = -1;
02e54220
PH
1816 } else if (!strcmp(arg, "--boundary")) {
1817 revs->boundary = 1;
1818 } else if (!strcmp(arg, "--left-right")) {
1819 revs->left_right = 1;
60adf7d7 1820 } else if (!strcmp(arg, "--left-only")) {
24852d91 1821 if (revs->right_only)
94f605ec
MG
1822 die("--left-only is incompatible with --right-only"
1823 " or --cherry");
60adf7d7
MG
1824 revs->left_only = 1;
1825 } else if (!strcmp(arg, "--right-only")) {
24852d91
JH
1826 if (revs->left_only)
1827 die("--right-only is incompatible with --left-only");
60adf7d7 1828 revs->right_only = 1;
94f605ec
MG
1829 } else if (!strcmp(arg, "--cherry")) {
1830 if (revs->left_only)
1831 die("--cherry is incompatible with --left-only");
1832 revs->cherry_mark = 1;
1833 revs->right_only = 1;
ad5aeede 1834 revs->max_parents = 1;
94f605ec 1835 revs->limited = 1;
f69c5018
TR
1836 } else if (!strcmp(arg, "--count")) {
1837 revs->count = 1;
adbbb31e
MG
1838 } else if (!strcmp(arg, "--cherry-mark")) {
1839 if (revs->cherry_pick)
1840 die("--cherry-mark is incompatible with --cherry-pick");
1841 revs->cherry_mark = 1;
1842 revs->limited = 1; /* needs limit_list() */
02e54220 1843 } else if (!strcmp(arg, "--cherry-pick")) {
adbbb31e
MG
1844 if (revs->cherry_mark)
1845 die("--cherry-pick is incompatible with --cherry-mark");
02e54220
PH
1846 revs->cherry_pick = 1;
1847 revs->limited = 1;
1848 } else if (!strcmp(arg, "--objects")) {
1849 revs->tag_objects = 1;
1850 revs->tree_objects = 1;
1851 revs->blob_objects = 1;
1852 } else if (!strcmp(arg, "--objects-edge")) {
1853 revs->tag_objects = 1;
1854 revs->tree_objects = 1;
1855 revs->blob_objects = 1;
1856 revs->edge_hint = 1;
1684c1b2 1857 } else if (!strcmp(arg, "--objects-edge-aggressive")) {
1858 revs->tag_objects = 1;
1859 revs->tree_objects = 1;
1860 revs->blob_objects = 1;
1861 revs->edge_hint = 1;
1862 revs->edge_hint_aggressive = 1;
5a48d240
JH
1863 } else if (!strcmp(arg, "--verify-objects")) {
1864 revs->tag_objects = 1;
1865 revs->tree_objects = 1;
1866 revs->blob_objects = 1;
1867 revs->verify_objects = 1;
02e54220
PH
1868 } else if (!strcmp(arg, "--unpacked")) {
1869 revs->unpacked = 1;
59556548 1870 } else if (starts_with(arg, "--unpacked=")) {
03a9683d 1871 die("--unpacked=<packfile> no longer supported.");
02e54220
PH
1872 } else if (!strcmp(arg, "-r")) {
1873 revs->diff = 1;
1874 DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
1875 } else if (!strcmp(arg, "-t")) {
1876 revs->diff = 1;
1877 DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
1878 DIFF_OPT_SET(&revs->diffopt, TREE_IN_RECURSIVE);
1879 } else if (!strcmp(arg, "-m")) {
1880 revs->ignore_merges = 0;
1881 } else if (!strcmp(arg, "-c")) {
1882 revs->diff = 1;
1883 revs->dense_combined_merges = 0;
1884 revs->combine_merges = 1;
1885 } else if (!strcmp(arg, "--cc")) {
1886 revs->diff = 1;
1887 revs->dense_combined_merges = 1;
1888 revs->combine_merges = 1;
1889 } else if (!strcmp(arg, "-v")) {
1890 revs->verbose_header = 1;
1891 } else if (!strcmp(arg, "--pretty")) {
1892 revs->verbose_header = 1;
66b2ed09 1893 revs->pretty_given = 1;
ae18165f 1894 get_commit_format(NULL, revs);
479b3d97
SG
1895 } else if (skip_prefix(arg, "--pretty=", &optarg) ||
1896 skip_prefix(arg, "--format=", &optarg)) {
7d7b86f7
MM
1897 /*
1898 * Detached form ("--pretty X" as opposed to "--pretty=X")
1899 * not allowed, since the argument is optional.
1900 */
02e54220 1901 revs->verbose_header = 1;
66b2ed09 1902 revs->pretty_given = 1;
479b3d97 1903 get_commit_format(optarg, revs);
7cc13c71 1904 } else if (!strcmp(arg, "--expand-tabs")) {
fe37a9c5 1905 revs->expand_tabs_in_log = 8;
0893eec8
JH
1906 } else if (!strcmp(arg, "--no-expand-tabs")) {
1907 revs->expand_tabs_in_log = 0;
fe37a9c5
JH
1908 } else if (skip_prefix(arg, "--expand-tabs=", &arg)) {
1909 int val;
1910 if (strtol_i(arg, 10, &val) < 0 || val < 0)
1911 die("'%s': not a non-negative integer", arg);
1912 revs->expand_tabs_in_log = val;
7249e912 1913 } else if (!strcmp(arg, "--show-notes") || !strcmp(arg, "--notes")) {
66b2ed09
JH
1914 revs->show_notes = 1;
1915 revs->show_notes_given = 1;
3a03cf6b 1916 revs->notes_opt.use_default_notes = 1;
0c37f1fc
JH
1917 } else if (!strcmp(arg, "--show-signature")) {
1918 revs->show_signature = 1;
aa379999
MJ
1919 } else if (!strcmp(arg, "--no-show-signature")) {
1920 revs->show_signature = 0;
479b3d97
SG
1921 } else if (!strcmp(arg, "--show-linear-break")) {
1922 revs->break_bar = " ..........";
1b32dece
NTND
1923 revs->track_linear = 1;
1924 revs->track_first_time = 1;
479b3d97
SG
1925 } else if (skip_prefix(arg, "--show-linear-break=", &optarg)) {
1926 revs->break_bar = xstrdup(optarg);
1b32dece
NTND
1927 revs->track_linear = 1;
1928 revs->track_first_time = 1;
479b3d97
SG
1929 } else if (skip_prefix(arg, "--show-notes=", &optarg) ||
1930 skip_prefix(arg, "--notes=", &optarg)) {
894a9d33
TR
1931 struct strbuf buf = STRBUF_INIT;
1932 revs->show_notes = 1;
1933 revs->show_notes_given = 1;
479b3d97
SG
1934 if (starts_with(arg, "--show-notes=") &&
1935 revs->notes_opt.use_default_notes < 0)
1936 revs->notes_opt.use_default_notes = 1;
1937 strbuf_addstr(&buf, optarg);
c063f0a9 1938 expand_notes_ref(&buf);
304cc11c 1939 string_list_append(&revs->notes_opt.extra_notes_refs,
1d2f80fa 1940 strbuf_detach(&buf, NULL));
66b2ed09
JH
1941 } else if (!strcmp(arg, "--no-notes")) {
1942 revs->show_notes = 0;
1943 revs->show_notes_given = 1;
92e0d425
JK
1944 revs->notes_opt.use_default_notes = -1;
1945 /* we have been strdup'ing ourselves, so trick
1946 * string_list into free()ing strings */
1947 revs->notes_opt.extra_notes_refs.strdup_strings = 1;
1948 string_list_clear(&revs->notes_opt.extra_notes_refs, 0);
1949 revs->notes_opt.extra_notes_refs.strdup_strings = 0;
894a9d33
TR
1950 } else if (!strcmp(arg, "--standard-notes")) {
1951 revs->show_notes_given = 1;
3a03cf6b 1952 revs->notes_opt.use_default_notes = 1;
894a9d33 1953 } else if (!strcmp(arg, "--no-standard-notes")) {
3a03cf6b 1954 revs->notes_opt.use_default_notes = 0;
de84accc
NS
1955 } else if (!strcmp(arg, "--oneline")) {
1956 revs->verbose_header = 1;
1957 get_commit_format("oneline", revs);
7dccadf3 1958 revs->pretty_given = 1;
de84accc 1959 revs->abbrev_commit = 1;
02e54220
PH
1960 } else if (!strcmp(arg, "--graph")) {
1961 revs->topo_order = 1;
1962 revs->rewrite_parents = 1;
1963 revs->graph = graph_init(revs);
1964 } else if (!strcmp(arg, "--root")) {
1965 revs->show_root_diff = 1;
1966 } else if (!strcmp(arg, "--no-commit-id")) {
1967 revs->no_commit_id = 1;
1968 } else if (!strcmp(arg, "--always")) {
1969 revs->always_show_header = 1;
1970 } else if (!strcmp(arg, "--no-abbrev")) {
1971 revs->abbrev = 0;
1972 } else if (!strcmp(arg, "--abbrev")) {
1973 revs->abbrev = DEFAULT_ABBREV;
479b3d97
SG
1974 } else if (skip_prefix(arg, "--abbrev=", &optarg)) {
1975 revs->abbrev = strtoul(optarg, NULL, 10);
02e54220
PH
1976 if (revs->abbrev < MINIMUM_ABBREV)
1977 revs->abbrev = MINIMUM_ABBREV;
1978 else if (revs->abbrev > 40)
1979 revs->abbrev = 40;
1980 } else if (!strcmp(arg, "--abbrev-commit")) {
1981 revs->abbrev_commit = 1;
0c47695a
JS
1982 revs->abbrev_commit_given = 1;
1983 } else if (!strcmp(arg, "--no-abbrev-commit")) {
1984 revs->abbrev_commit = 0;
02e54220
PH
1985 } else if (!strcmp(arg, "--full-diff")) {
1986 revs->diff = 1;
1987 revs->full_diff = 1;
1988 } else if (!strcmp(arg, "--full-history")) {
1989 revs->simplify_history = 0;
1990 } else if (!strcmp(arg, "--relative-date")) {
a5481a6c 1991 revs->date_mode.type = DATE_RELATIVE;
f4ea32f0 1992 revs->date_mode_explicit = 1;
7d7b86f7 1993 } else if ((argcount = parse_long_opt("date", argv, &optarg))) {
a5481a6c 1994 parse_date_format(optarg, &revs->date_mode);
f4ea32f0 1995 revs->date_mode_explicit = 1;
7d7b86f7 1996 return argcount;
02e54220
PH
1997 } else if (!strcmp(arg, "--log-size")) {
1998 revs->show_log_size = 1;
1999 }
2000 /*
2001 * Grepping the commit log
2002 */
7d7b86f7
MM
2003 else if ((argcount = parse_long_opt("author", argv, &optarg))) {
2004 add_header_grep(revs, GREP_HEADER_AUTHOR, optarg);
2005 return argcount;
2006 } else if ((argcount = parse_long_opt("committer", argv, &optarg))) {
2007 add_header_grep(revs, GREP_HEADER_COMMITTER, optarg);
2008 return argcount;
72fd13f7
NTND
2009 } else if ((argcount = parse_long_opt("grep-reflog", argv, &optarg))) {
2010 add_header_grep(revs, GREP_HEADER_REFLOG, optarg);
2011 return argcount;
7d7b86f7
MM
2012 } else if ((argcount = parse_long_opt("grep", argv, &optarg))) {
2013 add_message_grep(revs, optarg);
2014 return argcount;
17bf35a3
JH
2015 } else if (!strcmp(arg, "--grep-debug")) {
2016 revs->grep_filter.debug = 1;
727b6fc3 2017 } else if (!strcmp(arg, "--basic-regexp")) {
8465541e 2018 revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_BRE;
02e54220 2019 } else if (!strcmp(arg, "--extended-regexp") || !strcmp(arg, "-E")) {
8465541e 2020 revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_ERE;
02e54220 2021 } else if (!strcmp(arg, "--regexp-ignore-case") || !strcmp(arg, "-i")) {
9e3cbc59 2022 revs->grep_filter.ignore_case = 1;
0843acfd 2023 revs->grep_filter.regflags |= REG_ICASE;
accccde4 2024 DIFF_OPT_SET(&revs->diffopt, PICKAXE_IGNORE_CASE);
02e54220 2025 } else if (!strcmp(arg, "--fixed-strings") || !strcmp(arg, "-F")) {
8465541e 2026 revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_FIXED;
7531a2dd 2027 } else if (!strcmp(arg, "--perl-regexp") || !strcmp(arg, "-P")) {
8465541e 2028 revs->grep_filter.pattern_type_option = GREP_PATTERN_TYPE_PCRE;
02e54220 2029 } else if (!strcmp(arg, "--all-match")) {
0843acfd 2030 revs->grep_filter.all_match = 1;
22dfa8a2
CJ
2031 } else if (!strcmp(arg, "--invert-grep")) {
2032 revs->invert_grep = 1;
7d7b86f7
MM
2033 } else if ((argcount = parse_long_opt("encoding", argv, &optarg))) {
2034 if (strcmp(optarg, "none"))
2035 git_log_output_encoding = xstrdup(optarg);
02e54220
PH
2036 else
2037 git_log_output_encoding = "";
7d7b86f7 2038 return argcount;
02e54220
PH
2039 } else if (!strcmp(arg, "--reverse")) {
2040 revs->reverse ^= 1;
2041 } else if (!strcmp(arg, "--children")) {
2042 revs->children.name = "children";
2043 revs->limited = 1;
cc243c3c
JH
2044 } else if (!strcmp(arg, "--ignore-missing")) {
2045 revs->ignore_missing = 1;
02e54220 2046 } else {
a97262c6 2047 int opts = diff_opt_parse(&revs->diffopt, argv, argc, revs->prefix);
02e54220
PH
2048 if (!opts)
2049 unkv[(*unkc)++] = arg;
2050 return opts;
2051 }
1b32dece
NTND
2052 if (revs->graph && revs->track_linear)
2053 die("--show-linear-break and --graph are incompatible");
02e54220
PH
2054
2055 return 1;
2056}
2057
6b61ec05
PH
2058void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
2059 const struct option *options,
2060 const char * const usagestr[])
2061{
2062 int n = handle_revision_opt(revs, ctx->argc, ctx->argv,
2063 &ctx->cpidx, ctx->out);
2064 if (n <= 0) {
2065 error("unknown option `%s'", ctx->argv[0]);
2066 usage_with_options(usagestr, options);
2067 }
2068 ctx->argv += n;
2069 ctx->argc -= n;
2070}
2071
cb46d630
AD
2072static int for_each_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data, const char *term) {
2073 struct strbuf bisect_refs = STRBUF_INIT;
2074 int status;
2075 strbuf_addf(&bisect_refs, "refs/bisect/%s", term);
03df567f 2076 status = for_each_fullref_in_submodule(submodule, bisect_refs.buf, fn, cb_data, 0);
cb46d630
AD
2077 strbuf_release(&bisect_refs);
2078 return status;
2079}
2080
9ef6aeb0 2081static int for_each_bad_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data)
ad3f9a71 2082{
cb46d630 2083 return for_each_bisect_ref(submodule, fn, cb_data, term_bad);
ad3f9a71
LT
2084}
2085
9ef6aeb0 2086static int for_each_good_bisect_ref(const char *submodule, each_ref_fn fn, void *cb_data)
ad3f9a71 2087{
cb46d630 2088 return for_each_bisect_ref(submodule, fn, cb_data, term_good);
ad3f9a71
LT
2089}
2090
f6aca0dc
JN
2091static int handle_revision_pseudo_opt(const char *submodule,
2092 struct rev_info *revs,
2093 int argc, const char **argv, int *flags)
2094{
2095 const char *arg = argv[0];
2096 const char *optarg;
2097 int argcount;
2098
0fc63ec4
JN
2099 /*
2100 * NOTE!
2101 *
2102 * Commands like "git shortlog" will not accept the options below
2103 * unless parse_revision_opt queues them (as opposed to erroring
2104 * out).
2105 *
2106 * When implementing your new pseudo-option, remember to
2107 * register it in the list at the top of handle_revision_opt.
2108 */
f6aca0dc
JN
2109 if (!strcmp(arg, "--all")) {
2110 handle_refs(submodule, revs, *flags, for_each_ref_submodule);
2111 handle_refs(submodule, revs, *flags, head_ref_submodule);
ff32d342 2112 clear_ref_exclusion(&revs->ref_excludes);
f6aca0dc
JN
2113 } else if (!strcmp(arg, "--branches")) {
2114 handle_refs(submodule, revs, *flags, for_each_branch_ref_submodule);
ff32d342 2115 clear_ref_exclusion(&revs->ref_excludes);
f6aca0dc 2116 } else if (!strcmp(arg, "--bisect")) {
cb46d630 2117 read_bisect_terms(&term_bad, &term_good);
f6aca0dc 2118 handle_refs(submodule, revs, *flags, for_each_bad_bisect_ref);
7f34a46f 2119 handle_refs(submodule, revs, *flags ^ (UNINTERESTING | BOTTOM), for_each_good_bisect_ref);
f6aca0dc
JN
2120 revs->bisect = 1;
2121 } else if (!strcmp(arg, "--tags")) {
2122 handle_refs(submodule, revs, *flags, for_each_tag_ref_submodule);
ff32d342 2123 clear_ref_exclusion(&revs->ref_excludes);
f6aca0dc
JN
2124 } else if (!strcmp(arg, "--remotes")) {
2125 handle_refs(submodule, revs, *flags, for_each_remote_ref_submodule);
ff32d342 2126 clear_ref_exclusion(&revs->ref_excludes);
f6aca0dc
JN
2127 } else if ((argcount = parse_long_opt("glob", argv, &optarg))) {
2128 struct all_refs_cb cb;
2129 init_all_refs_cb(&cb, revs, *flags);
a217dcbd 2130 for_each_glob_ref(handle_one_ref, optarg, &cb);
ff32d342 2131 clear_ref_exclusion(&revs->ref_excludes);
e7b432c5
JH
2132 return argcount;
2133 } else if ((argcount = parse_long_opt("exclude", argv, &optarg))) {
ff32d342 2134 add_ref_exclusion(&revs->ref_excludes, optarg);
f6aca0dc 2135 return argcount;
8b1d9136 2136 } else if (skip_prefix(arg, "--branches=", &optarg)) {
f6aca0dc
JN
2137 struct all_refs_cb cb;
2138 init_all_refs_cb(&cb, revs, *flags);
8b1d9136 2139 for_each_glob_ref_in(handle_one_ref, optarg, "refs/heads/", &cb);
ff32d342 2140 clear_ref_exclusion(&revs->ref_excludes);
8b1d9136 2141 } else if (skip_prefix(arg, "--tags=", &optarg)) {
f6aca0dc
JN
2142 struct all_refs_cb cb;
2143 init_all_refs_cb(&cb, revs, *flags);
8b1d9136 2144 for_each_glob_ref_in(handle_one_ref, optarg, "refs/tags/", &cb);
ff32d342 2145 clear_ref_exclusion(&revs->ref_excludes);
8b1d9136 2146 } else if (skip_prefix(arg, "--remotes=", &optarg)) {
f6aca0dc
JN
2147 struct all_refs_cb cb;
2148 init_all_refs_cb(&cb, revs, *flags);
8b1d9136 2149 for_each_glob_ref_in(handle_one_ref, optarg, "refs/remotes/", &cb);
ff32d342 2150 clear_ref_exclusion(&revs->ref_excludes);
f6aca0dc 2151 } else if (!strcmp(arg, "--reflog")) {
718ccc97 2152 add_reflogs_to_pending(revs, *flags);
4fe10219
JK
2153 } else if (!strcmp(arg, "--indexed-objects")) {
2154 add_index_objects_to_pending(revs, *flags);
f6aca0dc 2155 } else if (!strcmp(arg, "--not")) {
7f34a46f 2156 *flags ^= UNINTERESTING | BOTTOM;
f6aca0dc 2157 } else if (!strcmp(arg, "--no-walk")) {
ca92e59e 2158 revs->no_walk = REVISION_WALK_NO_WALK_SORTED;
8b1d9136 2159 } else if (skip_prefix(arg, "--no-walk=", &optarg)) {
ca92e59e
MZ
2160 /*
2161 * Detached form ("--no-walk X" as opposed to "--no-walk=X")
2162 * not allowed, since the argument is optional.
2163 */
8b1d9136 2164 if (!strcmp(optarg, "sorted"))
ca92e59e 2165 revs->no_walk = REVISION_WALK_NO_WALK_SORTED;
8b1d9136 2166 else if (!strcmp(optarg, "unsorted"))
ca92e59e
MZ
2167 revs->no_walk = REVISION_WALK_NO_WALK_UNSORTED;
2168 else
2169 return error("invalid argument to --no-walk");
f6aca0dc
JN
2170 } else if (!strcmp(arg, "--do-walk")) {
2171 revs->no_walk = 0;
2172 } else {
2173 return 0;
2174 }
2175
2176 return 1;
2177}
2178
ce113604
JK
2179static void NORETURN diagnose_missing_default(const char *def)
2180{
2181 unsigned char sha1[20];
2182 int flags;
2183 const char *refname;
2184
2185 refname = resolve_ref_unsafe(def, 0, sha1, &flags);
2186 if (!refname || !(flags & REF_ISSYMREF) || (flags & REF_ISBROKEN))
2187 die(_("your current branch appears to be broken"));
2188
2189 skip_prefix(refname, "refs/heads/", &refname);
2190 die(_("your current branch '%s' does not have any commits yet"),
2191 refname);
2192}
2193
ae563542
LT
2194/*
2195 * Parse revision information, filling in the "rev_info" structure,
2196 * and removing the used arguments from the argument list.
2197 *
765ac8ec
LT
2198 * Returns the number of arguments left that weren't recognized
2199 * (which are also moved to the head of the argument list)
ae563542 2200 */
32962c9b 2201int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct setup_revision_opt *opt)
ae563542 2202{
8e676e8b 2203 int i, flags, left, seen_dashdash, read_from_stdin, got_rev_arg = 0, revarg_opt;
4da5af31 2204 struct cmdline_pathspec prune_data;
9ef6aeb0
HV
2205 const char *submodule = NULL;
2206
4da5af31 2207 memset(&prune_data, 0, sizeof(prune_data));
9ef6aeb0
HV
2208 if (opt)
2209 submodule = opt->submodule;
ae563542 2210
ae563542 2211 /* First, search for "--" */
6d5b93f2 2212 if (opt && opt->assume_dashdash) {
ae563542 2213 seen_dashdash = 1;
6d5b93f2
CB
2214 } else {
2215 seen_dashdash = 0;
2216 for (i = 1; i < argc; i++) {
2217 const char *arg = argv[i];
2218 if (strcmp(arg, "--"))
2219 continue;
2220 argv[i] = NULL;
2221 argc = i;
2222 if (argv[i + 1])
2223 append_prune_data(&prune_data, argv + i + 1);
2224 seen_dashdash = 1;
2225 break;
2226 }
ae563542
LT
2227 }
2228
02e54220
PH
2229 /* Second, deal with arguments and options */
2230 flags = 0;
d5f6b1d7
JH
2231 revarg_opt = opt ? opt->revarg_opt : 0;
2232 if (seen_dashdash)
2233 revarg_opt |= REVARG_CANNOT_BE_FILENAME;
8b3dce56 2234 read_from_stdin = 0;
02e54220 2235 for (left = i = 1; i < argc; i++) {
ae563542 2236 const char *arg = argv[i];
ae563542 2237 if (*arg == '-') {
cd2bdc53 2238 int opts;
02e54220 2239
f6aca0dc
JN
2240 opts = handle_revision_pseudo_opt(submodule,
2241 revs, argc - i, argv + i,
2242 &flags);
2243 if (opts > 0) {
2244 i += opts - 1;
8e64006e
JS
2245 continue;
2246 }
f6aca0dc 2247
8b3dce56
JH
2248 if (!strcmp(arg, "--stdin")) {
2249 if (revs->disable_stdin) {
2250 argv[left++] = arg;
2251 continue;
2252 }
2253 if (read_from_stdin++)
2254 die("--stdin given twice?");
60da8b15 2255 read_revisions_from_stdin(revs, &prune_data);
8b3dce56
JH
2256 continue;
2257 }
2d10c555 2258
02e54220 2259 opts = handle_revision_opt(revs, argc - i, argv + i, &left, argv);
cd2bdc53 2260 if (opts > 0) {
cd2bdc53
LT
2261 i += opts - 1;
2262 continue;
2263 }
02e54220
PH
2264 if (opts < 0)
2265 exit(128);
ae563542
LT
2266 continue;
2267 }
ae563542 2268
8e676e8b
JH
2269
2270 if (handle_revision_arg(arg, revs, flags, revarg_opt)) {
5d6f0935
JH
2271 int j;
2272 if (seen_dashdash || *arg == '^')
ae563542
LT
2273 die("bad revision '%s'", arg);
2274
ea92f41f
JH
2275 /* If we didn't have a "--":
2276 * (1) all filenames must exist;
2277 * (2) all rev-args must not be interpretable
2278 * as a valid filename.
2279 * but the latter we have checked in the main loop.
2280 */
e23d0b4a 2281 for (j = i; j < argc; j++)
023e37c3 2282 verify_filename(revs->prefix, argv[j], j == i);
e23d0b4a 2283
60da8b15 2284 append_prune_data(&prune_data, argv + i);
ae563542
LT
2285 break;
2286 }
8fcaca3f
DO
2287 else
2288 got_rev_arg = 1;
ae563542 2289 }
5d6f0935 2290
4da5af31 2291 if (prune_data.nr) {
93e7d672
JH
2292 /*
2293 * If we need to introduce the magic "a lone ':' means no
2294 * pathspec whatsoever", here is the place to do so.
2295 *
2296 * if (prune_data.nr == 1 && !strcmp(prune_data[0], ":")) {
2297 * prune_data.nr = 0;
2298 * prune_data.alloc = 0;
2299 * free(prune_data.path);
2300 * prune_data.path = NULL;
2301 * } else {
2302 * terminate prune_data.alloc with NULL and
2303 * call init_pathspec() to set revs->prune_data here.
2304 * }
2305 */
9e57ac55 2306 ALLOC_GROW(prune_data.path, prune_data.nr + 1, prune_data.alloc);
4da5af31 2307 prune_data.path[prune_data.nr++] = NULL;
0fdc2ae5
NTND
2308 parse_pathspec(&revs->prune_data, 0, 0,
2309 revs->prefix, prune_data.path);
4da5af31 2310 }
5486ef0e 2311
02e54220 2312 if (revs->def == NULL)
32962c9b 2313 revs->def = opt ? opt->def : NULL;
b4490059
JH
2314 if (opt && opt->tweak)
2315 opt->tweak(revs, opt);
02e54220 2316 if (revs->show_merge)
ae3e5e1e 2317 prepare_show_merge(revs);
8fcaca3f 2318 if (revs->def && !revs->pending.nr && !got_rev_arg) {
654b9a90 2319 struct object_id oid;
cd2bdc53 2320 struct object *object;
249c8f4a 2321 struct object_context oc;
654b9a90 2322 if (get_sha1_with_context(revs->def, 0, oid.hash, &oc))
ce113604 2323 diagnose_missing_default(revs->def);
654b9a90 2324 object = get_reference(revs, revs->def, &oid, 0);
249c8f4a 2325 add_pending_object_with_mode(revs, object, revs->def, oc.mode);
ae563542 2326 }
8efdc326 2327
b7bb760d
LT
2328 /* Did the user ask for any diff output? Run the diff! */
2329 if (revs->diffopt.output_format & ~DIFF_FORMAT_NO_OUTPUT)
2330 revs->diff = 1;
2331
0faf2da7
AL
2332 /* Pickaxe, diff-filter and rename following need diffs */
2333 if (revs->diffopt.pickaxe ||
2334 revs->diffopt.filter ||
2335 DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
b7bb760d
LT
2336 revs->diff = 1;
2337
9dad9d2e 2338 if (revs->topo_order)
53069686
JH
2339 revs->limited = 1;
2340
afe069d1 2341 if (revs->prune_data.nr) {
bd1928df 2342 copy_pathspec(&revs->pruning.pathspec, &revs->prune_data);
750f7b66 2343 /* Can't prune commits with rename following: the paths change.. */
8f67f8ae 2344 if (!DIFF_OPT_TST(&revs->diffopt, FOLLOW_RENAMES))
53b2c823 2345 revs->prune = 1;
cd2bdc53 2346 if (!revs->full_diff)
bd1928df
NTND
2347 copy_pathspec(&revs->diffopt.pathspec,
2348 &revs->prune_data);
8efdc326 2349 }
b4490059 2350 if (revs->combine_merges)
cd2bdc53 2351 revs->ignore_merges = 0;
cd2bdc53 2352 revs->diffopt.abbrev = revs->abbrev;
12da1d1f
TR
2353
2354 if (revs->line_level_traverse) {
2355 revs->limited = 1;
2356 revs->topo_order = 1;
2357 }
2358
28452655 2359 diff_setup_done(&revs->diffopt);
8efdc326 2360
918d4e1c
JH
2361 grep_commit_pattern_type(GREP_PATTERN_TYPE_UNSPECIFIED,
2362 &revs->grep_filter);
0843acfd 2363 compile_grep_patterns(&revs->grep_filter);
bd95fcd3 2364
d56651c0
SP
2365 if (revs->reverse && revs->reflog_info)
2366 die("cannot combine --reverse with --walk-reflogs");
82fd0f4a
JK
2367 if (revs->reflog_info && revs->limited)
2368 die("cannot combine --walk-reflogs with history-limiting options");
8bb65883 2369 if (revs->rewrite_parents && revs->children.name)
f35f5603 2370 die("cannot combine --parents and --children");
d56651c0 2371
7fefda5c
AS
2372 /*
2373 * Limitations on the graph functionality
2374 */
2375 if (revs->reverse && revs->graph)
2376 die("cannot combine --reverse with --graph");
2377
2378 if (revs->reflog_info && revs->graph)
2379 die("cannot combine --walk-reflogs with --graph");
695985f4
DJ
2380 if (revs->no_walk && revs->graph)
2381 die("cannot combine --no-walk with --graph");
baa6378f
JH
2382 if (!revs->reflog_info && revs->grep_filter.use_reflog_filter)
2383 die("cannot use --grep-reflog without --walk-reflogs");
7fefda5c 2384
f88851c6
KD
2385 if (revs->first_parent_only && revs->bisect)
2386 die(_("--first-parent is incompatible with --bisect"));
2387
0893eec8
JH
2388 if (revs->expand_tabs_in_log < 0)
2389 revs->expand_tabs_in_log = revs->expand_tabs_in_log_default;
2390
ae563542
LT
2391 return left;
2392}
a4a88b2b 2393
f35f5603
JH
2394static void add_child(struct rev_info *revs, struct commit *parent, struct commit *child)
2395{
2396 struct commit_list *l = xcalloc(1, sizeof(*l));
2397
2398 l->item = child;
2399 l->next = add_decoration(&revs->children, &parent->object, l);
2400}
2401
d0af663e 2402static int remove_duplicate_parents(struct rev_info *revs, struct commit *commit)
6546b593 2403{
d0af663e 2404 struct treesame_state *ts = lookup_decoration(&revs->treesame, &commit->object);
6546b593
JH
2405 struct commit_list **pp, *p;
2406 int surviving_parents;
2407
2408 /* Examine existing parents while marking ones we have seen... */
2409 pp = &commit->parents;
d0af663e 2410 surviving_parents = 0;
6546b593
JH
2411 while ((p = *pp) != NULL) {
2412 struct commit *parent = p->item;
2413 if (parent->object.flags & TMP_MARK) {
2414 *pp = p->next;
d0af663e
KB
2415 if (ts)
2416 compact_treesame(revs, commit, surviving_parents);
6546b593
JH
2417 continue;
2418 }
2419 parent->object.flags |= TMP_MARK;
d0af663e 2420 surviving_parents++;
6546b593
JH
2421 pp = &p->next;
2422 }
d0af663e 2423 /* clear the temporary mark */
6546b593
JH
2424 for (p = commit->parents; p; p = p->next) {
2425 p->item->object.flags &= ~TMP_MARK;
6546b593 2426 }
d0af663e 2427 /* no update_treesame() - removing duplicates can't affect TREESAME */
6546b593
JH
2428 return surviving_parents;
2429}
2430
faf0156b
JH
2431struct merge_simplify_state {
2432 struct commit *simplified;
2433};
2434
2435static struct merge_simplify_state *locate_simplify_state(struct rev_info *revs, struct commit *commit)
2436{
2437 struct merge_simplify_state *st;
2438
2439 st = lookup_decoration(&revs->merge_simplification, &commit->object);
2440 if (!st) {
2441 st = xcalloc(1, sizeof(*st));
2442 add_decoration(&revs->merge_simplification, &commit->object, st);
2443 }
2444 return st;
2445}
2446
d0af663e
KB
2447static int mark_redundant_parents(struct rev_info *revs, struct commit *commit)
2448{
2449 struct commit_list *h = reduce_heads(commit->parents);
2450 int i = 0, marked = 0;
2451 struct commit_list *po, *pn;
2452
2453 /* Want these for sanity-checking only */
2454 int orig_cnt = commit_list_count(commit->parents);
2455 int cnt = commit_list_count(h);
2456
2457 /*
2458 * Not ready to remove items yet, just mark them for now, based
2459 * on the output of reduce_heads(). reduce_heads outputs the reduced
2460 * set in its original order, so this isn't too hard.
2461 */
2462 po = commit->parents;
2463 pn = h;
2464 while (po) {
2465 if (pn && po->item == pn->item) {
2466 pn = pn->next;
2467 i++;
2468 } else {
2469 po->item->object.flags |= TMP_MARK;
2470 marked++;
2471 }
2472 po=po->next;
2473 }
2474
2475 if (i != cnt || cnt+marked != orig_cnt)
2476 die("mark_redundant_parents %d %d %d %d", orig_cnt, cnt, i, marked);
2477
2478 free_commit_list(h);
2479
2480 return marked;
2481}
2482
143f1eaf
KB
2483static int mark_treesame_root_parents(struct rev_info *revs, struct commit *commit)
2484{
2485 struct commit_list *p;
2486 int marked = 0;
2487
2488 for (p = commit->parents; p; p = p->next) {
2489 struct commit *parent = p->item;
2490 if (!parent->parents && (parent->object.flags & TREESAME)) {
2491 parent->object.flags |= TMP_MARK;
2492 marked++;
2493 }
2494 }
2495
2496 return marked;
2497}
2498
9c129eab
KB
2499/*
2500 * Awkward naming - this means one parent we are TREESAME to.
2501 * cf mark_treesame_root_parents: root parents that are TREESAME (to an
2502 * empty tree). Better name suggestions?
2503 */
2504static int leave_one_treesame_to_parent(struct rev_info *revs, struct commit *commit)
2505{
2506 struct treesame_state *ts = lookup_decoration(&revs->treesame, &commit->object);
2507 struct commit *unmarked = NULL, *marked = NULL;
2508 struct commit_list *p;
2509 unsigned n;
2510
2511 for (p = commit->parents, n = 0; p; p = p->next, n++) {
2512 if (ts->treesame[n]) {
2513 if (p->item->object.flags & TMP_MARK) {
2514 if (!marked)
2515 marked = p->item;
2516 } else {
2517 if (!unmarked) {
2518 unmarked = p->item;
2519 break;
2520 }
2521 }
2522 }
2523 }
2524
2525 /*
2526 * If we are TREESAME to a marked-for-deletion parent, but not to any
2527 * unmarked parents, unmark the first TREESAME parent. This is the
2528 * parent that the default simplify_history==1 scan would have followed,
2529 * and it doesn't make sense to omit that path when asking for a
2530 * simplified full history. Retaining it improves the chances of
2531 * understanding odd missed merges that took an old version of a file.
2532 *
2533 * Example:
2534 *
2535 * I--------*X A modified the file, but mainline merge X used
2536 * \ / "-s ours", so took the version from I. X is
2537 * `-*A--' TREESAME to I and !TREESAME to A.
2538 *
2539 * Default log from X would produce "I". Without this check,
2540 * --full-history --simplify-merges would produce "I-A-X", showing
2541 * the merge commit X and that it changed A, but not making clear that
2542 * it had just taken the I version. With this check, the topology above
2543 * is retained.
2544 *
2545 * Note that it is possible that the simplification chooses a different
2546 * TREESAME parent from the default, in which case this test doesn't
2547 * activate, and we _do_ drop the default parent. Example:
2548 *
2549 * I------X A modified the file, but it was reverted in B,
2550 * \ / meaning mainline merge X is TREESAME to both
2551 * *A-*B parents.
2552 *
2553 * Default log would produce "I" by following the first parent;
2554 * --full-history --simplify-merges will produce "I-A-B". But this is a
2555 * reasonable result - it presents a logical full history leading from
2556 * I to X, and X is not an important merge.
2557 */
2558 if (!unmarked && marked) {
2559 marked->object.flags &= ~TMP_MARK;
2560 return 1;
2561 }
2562
2563 return 0;
2564}
2565
d0af663e
KB
2566static int remove_marked_parents(struct rev_info *revs, struct commit *commit)
2567{
2568 struct commit_list **pp, *p;
2569 int nth_parent, removed = 0;
2570
2571 pp = &commit->parents;
2572 nth_parent = 0;
2573 while ((p = *pp) != NULL) {
2574 struct commit *parent = p->item;
2575 if (parent->object.flags & TMP_MARK) {
2576 parent->object.flags &= ~TMP_MARK;
2577 *pp = p->next;
2578 free(p);
2579 removed++;
2580 compact_treesame(revs, commit, nth_parent);
2581 continue;
2582 }
2583 pp = &p->next;
2584 nth_parent++;
2585 }
2586
2587 /* Removing parents can only increase TREESAMEness */
2588 if (removed && !(commit->object.flags & TREESAME))
2589 update_treesame(revs, commit);
2590
2591 return nth_parent;
2592}
2593
faf0156b 2594static struct commit_list **simplify_one(struct rev_info *revs, struct commit *commit, struct commit_list **tail)
6546b593
JH
2595{
2596 struct commit_list *p;
4d826608 2597 struct commit *parent;
faf0156b 2598 struct merge_simplify_state *st, *pst;
6546b593
JH
2599 int cnt;
2600
faf0156b
JH
2601 st = locate_simplify_state(revs, commit);
2602
6546b593 2603 /*
6546b593
JH
2604 * Have we handled this one?
2605 */
faf0156b 2606 if (st->simplified)
6546b593
JH
2607 return tail;
2608
2609 /*
2610 * An UNINTERESTING commit simplifies to itself, so does a
2611 * root commit. We do not rewrite parents of such commit
2612 * anyway.
2613 */
2614 if ((commit->object.flags & UNINTERESTING) || !commit->parents) {
faf0156b 2615 st->simplified = commit;
6546b593
JH
2616 return tail;
2617 }
2618
2619 /*
6e513ba3
JH
2620 * Do we know what commit all of our parents that matter
2621 * should be rewritten to? Otherwise we are not ready to
2622 * rewrite this one yet.
6546b593
JH
2623 */
2624 for (cnt = 0, p = commit->parents; p; p = p->next) {
faf0156b
JH
2625 pst = locate_simplify_state(revs, p->item);
2626 if (!pst->simplified) {
6546b593
JH
2627 tail = &commit_list_insert(p->item, tail)->next;
2628 cnt++;
2629 }
6e513ba3
JH
2630 if (revs->first_parent_only)
2631 break;
6546b593 2632 }
53030f8d
JH
2633 if (cnt) {
2634 tail = &commit_list_insert(commit, tail)->next;
6546b593 2635 return tail;
53030f8d 2636 }
6546b593
JH
2637
2638 /*
d0af663e
KB
2639 * Rewrite our list of parents. Note that this cannot
2640 * affect our TREESAME flags in any way - a commit is
2641 * always TREESAME to its simplification.
6546b593 2642 */
faf0156b
JH
2643 for (p = commit->parents; p; p = p->next) {
2644 pst = locate_simplify_state(revs, p->item);
2645 p->item = pst->simplified;
6e513ba3
JH
2646 if (revs->first_parent_only)
2647 break;
faf0156b 2648 }
4b7f53da 2649
0290bf12 2650 if (revs->first_parent_only)
6e513ba3 2651 cnt = 1;
0290bf12 2652 else
d0af663e 2653 cnt = remove_duplicate_parents(revs, commit);
6546b593
JH
2654
2655 /*
2656 * It is possible that we are a merge and one side branch
2657 * does not have any commit that touches the given paths;
d0af663e
KB
2658 * in such a case, the immediate parent from that branch
2659 * will be rewritten to be the merge base.
6546b593
JH
2660 *
2661 * o----X X: the commit we are looking at;
2662 * / / o: a commit that touches the paths;
2663 * ---o----'
2664 *
143f1eaf
KB
2665 * Further, a merge of an independent branch that doesn't
2666 * touch the path will reduce to a treesame root parent:
2667 *
2668 * ----o----X X: the commit we are looking at;
2669 * / o: a commit that touches the paths;
2670 * r r: a root commit not touching the paths
2671 *
2672 * Detect and simplify both cases.
6546b593
JH
2673 */
2674 if (1 < cnt) {
d0af663e 2675 int marked = mark_redundant_parents(revs, commit);
143f1eaf 2676 marked += mark_treesame_root_parents(revs, commit);
9c129eab
KB
2677 if (marked)
2678 marked -= leave_one_treesame_to_parent(revs, commit);
d0af663e
KB
2679 if (marked)
2680 cnt = remove_marked_parents(revs, commit);
6546b593
JH
2681 }
2682
2683 /*
2684 * A commit simplifies to itself if it is a root, if it is
2685 * UNINTERESTING, if it touches the given paths, or if it is a
4d826608 2686 * merge and its parents don't simplify to one relevant commit
6546b593
JH
2687 * (the first two cases are already handled at the beginning of
2688 * this function).
2689 *
4d826608
KB
2690 * Otherwise, it simplifies to what its sole relevant parent
2691 * simplifies to.
6546b593
JH
2692 */
2693 if (!cnt ||
2694 (commit->object.flags & UNINTERESTING) ||
2695 !(commit->object.flags & TREESAME) ||
4d826608 2696 (parent = one_relevant_parent(revs, commit->parents)) == NULL)
faf0156b
JH
2697 st->simplified = commit;
2698 else {
4d826608 2699 pst = locate_simplify_state(revs, parent);
faf0156b
JH
2700 st->simplified = pst->simplified;
2701 }
6546b593
JH
2702 return tail;
2703}
2704
2705static void simplify_merges(struct rev_info *revs)
2706{
ab9d75a8 2707 struct commit_list *list, *next;
6546b593 2708 struct commit_list *yet_to_do, **tail;
ab9d75a8 2709 struct commit *commit;
6546b593 2710
5eac739e
JH
2711 if (!revs->prune)
2712 return;
65347030 2713
6546b593
JH
2714 /* feed the list reversed */
2715 yet_to_do = NULL;
ab9d75a8
JH
2716 for (list = revs->commits; list; list = next) {
2717 commit = list->item;
2718 next = list->next;
2719 /*
2720 * Do not free(list) here yet; the original list
2721 * is used later in this function.
2722 */
2723 commit_list_insert(commit, &yet_to_do);
2724 }
6546b593
JH
2725 while (yet_to_do) {
2726 list = yet_to_do;
2727 yet_to_do = NULL;
2728 tail = &yet_to_do;
2729 while (list) {
e510ab89 2730 commit = pop_commit(&list);
faf0156b 2731 tail = simplify_one(revs, commit, tail);
6546b593
JH
2732 }
2733 }
2734
2735 /* clean up the result, removing the simplified ones */
2736 list = revs->commits;
2737 revs->commits = NULL;
2738 tail = &revs->commits;
2739 while (list) {
faf0156b 2740 struct merge_simplify_state *st;
ab9d75a8 2741
e510ab89 2742 commit = pop_commit(&list);
faf0156b
JH
2743 st = locate_simplify_state(revs, commit);
2744 if (st->simplified == commit)
6546b593
JH
2745 tail = &commit_list_insert(commit, tail)->next;
2746 }
6546b593
JH
2747}
2748
f35f5603
JH
2749static void set_children(struct rev_info *revs)
2750{
2751 struct commit_list *l;
2752 for (l = revs->commits; l; l = l->next) {
2753 struct commit *commit = l->item;
2754 struct commit_list *p;
2755
2756 for (p = commit->parents; p; p = p->next)
2757 add_child(revs, p->item, commit);
2758 }
2759}
2760
bcc0a3ea
HV
2761void reset_revision_walk(void)
2762{
2763 clear_object_flags(SEEN | ADDED | SHOWN);
2764}
2765
cc0e6c5a 2766int prepare_revision_walk(struct rev_info *revs)
a4a88b2b 2767{
1da1e07c
JK
2768 int i;
2769 struct object_array old_pending;
2e7da8e9 2770 struct commit_list **next = &revs->commits;
cd2bdc53 2771
1da1e07c 2772 memcpy(&old_pending, &revs->pending, sizeof(old_pending));
1f1e895f
LT
2773 revs->pending.nr = 0;
2774 revs->pending.alloc = 0;
2775 revs->pending.objects = NULL;
1da1e07c
JK
2776 for (i = 0; i < old_pending.nr; i++) {
2777 struct object_array_entry *e = old_pending.objects + i;
20739490 2778 struct commit *commit = handle_commit(revs, e);
cd2bdc53
LT
2779 if (commit) {
2780 if (!(commit->object.flags & SEEN)) {
2781 commit->object.flags |= SEEN;
2e7da8e9 2782 next = commit_list_append(commit, next);
cd2bdc53
LT
2783 }
2784 }
cd2bdc53 2785 }
4a43d374 2786 if (!revs->leak_pending)
1da1e07c 2787 object_array_clear(&old_pending);
cd2bdc53 2788
d0af663e 2789 /* Signal whether we need per-parent treesame decoration */
4d826608
KB
2790 if (revs->simplify_merges ||
2791 (revs->limited && limiting_can_increase_treesame(revs)))
d0af663e
KB
2792 revs->treesame.name = "treesame";
2793
ca92e59e
MZ
2794 if (revs->no_walk != REVISION_WALK_NO_WALK_UNSORTED)
2795 commit_list_sort_by_date(&revs->commits);
ba1d4505 2796 if (revs->no_walk)
cc0e6c5a 2797 return 0;
a4a88b2b 2798 if (revs->limited)
cc0e6c5a
AR
2799 if (limit_list(revs) < 0)
2800 return -1;
a4a88b2b 2801 if (revs->topo_order)
08f704f2 2802 sort_in_topological_order(&revs->commits, revs->sort_order);
12da1d1f
TR
2803 if (revs->line_level_traverse)
2804 line_log_filter(revs);
6546b593
JH
2805 if (revs->simplify_merges)
2806 simplify_merges(revs);
f35f5603
JH
2807 if (revs->children.name)
2808 set_children(revs);
cc0e6c5a 2809 return 0;
a4a88b2b
LT
2810}
2811
cc0e6c5a 2812static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp)
765ac8ec 2813{
fce87ae5
AG
2814 struct commit_list *cache = NULL;
2815
765ac8ec
LT
2816 for (;;) {
2817 struct commit *p = *pp;
3381c790 2818 if (!revs->limited)
fce87ae5 2819 if (add_parents_to_list(revs, p, &revs->commits, &cache) < 0)
cc0e6c5a 2820 return rewrite_one_error;
7dc0fe3b
LT
2821 if (p->object.flags & UNINTERESTING)
2822 return rewrite_one_ok;
2823 if (!(p->object.flags & TREESAME))
cc0e6c5a 2824 return rewrite_one_ok;
765ac8ec 2825 if (!p->parents)
cc0e6c5a 2826 return rewrite_one_noparents;
4d826608
KB
2827 if ((p = one_relevant_parent(revs, p->parents)) == NULL)
2828 return rewrite_one_ok;
2829 *pp = p;
765ac8ec
LT
2830 }
2831}
2832
c7edcae0
BY
2833int rewrite_parents(struct rev_info *revs, struct commit *commit,
2834 rewrite_parent_fn_t rewrite_parent)
765ac8ec
LT
2835{
2836 struct commit_list **pp = &commit->parents;
2837 while (*pp) {
2838 struct commit_list *parent = *pp;
c7edcae0 2839 switch (rewrite_parent(revs, &parent->item)) {
cc0e6c5a
AR
2840 case rewrite_one_ok:
2841 break;
2842 case rewrite_one_noparents:
765ac8ec
LT
2843 *pp = parent->next;
2844 continue;
cc0e6c5a
AR
2845 case rewrite_one_error:
2846 return -1;
765ac8ec
LT
2847 }
2848 pp = &parent->next;
2849 }
d0af663e 2850 remove_duplicate_parents(revs, commit);
cc0e6c5a 2851 return 0;
765ac8ec
LT
2852}
2853
d72fbe81
AP
2854static int commit_rewrite_person(struct strbuf *buf, const char *what, struct string_list *mailmap)
2855{
2856 char *person, *endp;
2857 size_t len, namelen, maillen;
2858 const char *name;
2859 const char *mail;
2860 struct ident_split ident;
2861
2862 person = strstr(buf->buf, what);
2863 if (!person)
2864 return 0;
2865
2866 person += strlen(what);
2867 endp = strchr(person, '\n');
2868 if (!endp)
2869 return 0;
2870
2871 len = endp - person;
2872
2873 if (split_ident_line(&ident, person, len))
2874 return 0;
2875
2876 mail = ident.mail_begin;
2877 maillen = ident.mail_end - ident.mail_begin;
2878 name = ident.name_begin;
2879 namelen = ident.name_end - ident.name_begin;
2880
2881 if (map_user(mailmap, &mail, &maillen, &name, &namelen)) {
2882 struct strbuf namemail = STRBUF_INIT;
2883
2884 strbuf_addf(&namemail, "%.*s <%.*s>",
2885 (int)namelen, name, (int)maillen, mail);
2886
2887 strbuf_splice(buf, ident.name_begin - buf->buf,
2888 ident.mail_end - ident.name_begin + 1,
2889 namemail.buf, namemail.len);
2890
2891 strbuf_release(&namemail);
2892
2893 return 1;
2894 }
2895
2896 return 0;
2897}
2898
8ecae9b0
JH
2899static int commit_match(struct commit *commit, struct rev_info *opt)
2900{
72fd13f7 2901 int retval;
04deccda 2902 const char *encoding;
b000c59b 2903 const char *message;
72fd13f7 2904 struct strbuf buf = STRBUF_INIT;
04deccda 2905
80235ba7 2906 if (!opt->grep_filter.pattern_list && !opt->grep_filter.header_list)
8ecae9b0 2907 return 1;
baa6378f
JH
2908
2909 /* Prepend "fake" headers as needed */
2910 if (opt->grep_filter.use_reflog_filter) {
72fd13f7
NTND
2911 strbuf_addstr(&buf, "reflog ");
2912 get_reflog_message(&buf, opt->reflog_info);
2913 strbuf_addch(&buf, '\n');
72fd13f7 2914 }
baa6378f 2915
04deccda
JK
2916 /*
2917 * We grep in the user's output encoding, under the assumption that it
2918 * is the encoding they are most likely to write their grep pattern
2919 * for. In addition, it means we will match the "notes" encoding below,
2920 * so we will not end up with a buffer that has two different encodings
2921 * in it.
2922 */
2923 encoding = get_log_output_encoding();
5a10d236 2924 message = logmsg_reencode(commit, NULL, encoding);
04deccda 2925
baa6378f
JH
2926 /* Copy the commit to temporary if we are using "fake" headers */
2927 if (buf.len)
04deccda 2928 strbuf_addstr(&buf, message);
baa6378f 2929
df874fa8 2930 if (opt->grep_filter.header_list && opt->mailmap) {
d72fbe81 2931 if (!buf.len)
04deccda 2932 strbuf_addstr(&buf, message);
d72fbe81
AP
2933
2934 commit_rewrite_person(&buf, "\nauthor ", opt->mailmap);
2935 commit_rewrite_person(&buf, "\ncommitter ", opt->mailmap);
2936 }
2937
38cfe915
NTND
2938 /* Append "fake" message parts as needed */
2939 if (opt->show_notes) {
2940 if (!buf.len)
04deccda 2941 strbuf_addstr(&buf, message);
fb61e4d3 2942 format_display_notes(&commit->object.oid, &buf, encoding, 1);
38cfe915
NTND
2943 }
2944
b000c59b
JK
2945 /*
2946 * Find either in the original commit message, or in the temporary.
2947 * Note that we cast away the constness of "message" here. It is
2948 * const because it may come from the cached commit buffer. That's OK,
2949 * because we know that it is modifiable heap memory, and that while
2950 * grep_buffer may modify it for speed, it will restore any
2951 * changes before returning.
2952 */
72fd13f7
NTND
2953 if (buf.len)
2954 retval = grep_buffer(&opt->grep_filter, buf.buf, buf.len);
2955 else
2956 retval = grep_buffer(&opt->grep_filter,
b000c59b 2957 (char *)message, strlen(message));
72fd13f7 2958 strbuf_release(&buf);
b66103c3 2959 unuse_commit_buffer(commit, message);
22dfa8a2 2960 return opt->invert_grep ? !retval : retval;
8ecae9b0
JH
2961}
2962
53d00b39 2963static inline int want_ancestry(const struct rev_info *revs)
f35f5603 2964{
8bb65883 2965 return (revs->rewrite_parents || revs->children.name);
f35f5603
JH
2966}
2967
beb5af43 2968enum commit_action get_commit_action(struct rev_info *revs, struct commit *commit)
252a7c02
LT
2969{
2970 if (commit->object.flags & SHOWN)
2971 return commit_ignore;
ed1c9977 2972 if (revs->unpacked && has_sha1_pack(commit->object.oid.hash))
252a7c02 2973 return commit_ignore;
3131b713
LT
2974 if (revs->show_all)
2975 return commit_show;
252a7c02
LT
2976 if (commit->object.flags & UNINTERESTING)
2977 return commit_ignore;
2978 if (revs->min_age != -1 && (commit->date > revs->min_age))
2979 return commit_ignore;
ad5aeede 2980 if (revs->min_parents || (revs->max_parents >= 0)) {
bf3418b0 2981 int n = commit_list_count(commit->parents);
ad5aeede
MG
2982 if ((n < revs->min_parents) ||
2983 ((revs->max_parents >= 0) && (n > revs->max_parents)))
2984 return commit_ignore;
2985 }
252a7c02
LT
2986 if (!commit_match(commit, revs))
2987 return commit_ignore;
53b2c823 2988 if (revs->prune && revs->dense) {
252a7c02 2989 /* Commit without changes? */
7dc0fe3b 2990 if (commit->object.flags & TREESAME) {
bf3418b0
KB
2991 int n;
2992 struct commit_list *p;
252a7c02 2993 /* drop merges unless we want parenthood */
f35f5603 2994 if (!want_ancestry(revs))
252a7c02 2995 return commit_ignore;
bf3418b0
KB
2996 /*
2997 * If we want ancestry, then need to keep any merges
2998 * between relevant commits to tie together topology.
2999 * For consistency with TREESAME and simplification
3000 * use "relevant" here rather than just INTERESTING,
3001 * to treat bottom commit(s) as part of the topology.
3002 */
3003 for (n = 0, p = commit->parents; p; p = p->next)
3004 if (relevant_commit(p->item))
3005 if (++n >= 2)
3006 return commit_show;
3007 return commit_ignore;
252a7c02 3008 }
252a7c02
LT
3009 }
3010 return commit_show;
3011}
3012
0131c490
JH
3013define_commit_slab(saved_parents, struct commit_list *);
3014
3015#define EMPTY_PARENT_LIST ((struct commit_list *)-1)
3016
3017/*
3018 * You may only call save_parents() once per commit (this is checked
3019 * for non-root commits).
3020 */
3021static void save_parents(struct rev_info *revs, struct commit *commit)
3022{
3023 struct commit_list **pp;
3024
3025 if (!revs->saved_parents_slab) {
3026 revs->saved_parents_slab = xmalloc(sizeof(struct saved_parents));
3027 init_saved_parents(revs->saved_parents_slab);
3028 }
3029
3030 pp = saved_parents_at(revs->saved_parents_slab, commit);
3031
3032 /*
3033 * When walking with reflogs, we may visit the same commit
3034 * several times: once for each appearance in the reflog.
3035 *
3036 * In this case, save_parents() will be called multiple times.
3037 * We want to keep only the first set of parents. We need to
3038 * store a sentinel value for an empty (i.e., NULL) parent
3039 * list to distinguish it from a not-yet-saved list, however.
3040 */
3041 if (*pp)
3042 return;
3043 if (commit->parents)
3044 *pp = copy_commit_list(commit->parents);
3045 else
3046 *pp = EMPTY_PARENT_LIST;
3047}
3048
3049static void free_saved_parents(struct rev_info *revs)
3050{
3051 if (revs->saved_parents_slab)
3052 clear_saved_parents(revs->saved_parents_slab);
3053}
3054
3055struct commit_list *get_saved_parents(struct rev_info *revs, const struct commit *commit)
3056{
3057 struct commit_list *parents;
3058
3059 if (!revs->saved_parents_slab)
3060 return commit->parents;
3061
3062 parents = *saved_parents_at(revs->saved_parents_slab, commit);
3063 if (parents == EMPTY_PARENT_LIST)
3064 return NULL;
3065 return parents;
3066}
3067
beb5af43
AS
3068enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
3069{
3070 enum commit_action action = get_commit_action(revs, commit);
3071
3072 if (action == commit_show &&
3073 !revs->show_all &&
3074 revs->prune && revs->dense && want_ancestry(revs)) {
53d00b39
TR
3075 /*
3076 * --full-diff on simplified parents is no good: it
3077 * will show spurious changes from the commits that
3078 * were elided. So we save the parents on the side
3079 * when --full-diff is in effect.
3080 */
3081 if (revs->full_diff)
3082 save_parents(revs, commit);
c7edcae0 3083 if (rewrite_parents(revs, commit, rewrite_one) < 0)
beb5af43
AS
3084 return commit_error;
3085 }
3086 return action;
3087}
3088
1b32dece
NTND
3089static void track_linear(struct rev_info *revs, struct commit *commit)
3090{
3091 if (revs->track_first_time) {
3092 revs->linear = 1;
3093 revs->track_first_time = 0;
3094 } else {
3095 struct commit_list *p;
3096 for (p = revs->previous_parents; p; p = p->next)
3097 if (p->item == NULL || /* first commit */
f2fd0760 3098 !oidcmp(&p->item->object.oid, &commit->object.oid))
1b32dece
NTND
3099 break;
3100 revs->linear = p != NULL;
3101 }
3102 if (revs->reverse) {
3103 if (revs->linear)
3104 commit->object.flags |= TRACK_LINEAR;
3105 }
3106 free_commit_list(revs->previous_parents);
3107 revs->previous_parents = copy_commit_list(commit->parents);
3108}
3109
d5db6c9e 3110static struct commit *get_revision_1(struct rev_info *revs)
a4a88b2b 3111{
7c2f08aa 3112 while (1) {
d08565bf
JK
3113 struct commit *commit;
3114
3115 if (revs->reflog_info)
3116 commit = next_reflog_entry(revs->reflog_info);
3117 else
3118 commit = pop_commit(&revs->commits);
2a0925be 3119
7c2f08aa
JK
3120 if (!commit)
3121 return NULL;
3122
d08565bf 3123 if (revs->reflog_info)
ffa1eeae 3124 commit->object.flags &= ~(ADDED | SEEN | SHOWN);
8860fd42 3125
2a0925be
LT
3126 /*
3127 * If we haven't done the list limiting, we need to look at
be7db6e5
LT
3128 * the parents here. We also need to do the date-based limiting
3129 * that we'd otherwise have done in limit_list().
2a0925be 3130 */
be7db6e5 3131 if (!revs->limited) {
744f4985 3132 if (revs->max_age != -1 &&
86ab4906
JH
3133 (commit->date < revs->max_age))
3134 continue;
d08565bf
JK
3135
3136 if (revs->reflog_info)
3137 try_to_simplify_commit(revs, commit);
3138 else if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0) {
2db1a43f
VM
3139 if (!revs->ignore_missing_links)
3140 die("Failed to traverse parents of commit %s",
f2fd0760 3141 oid_to_hex(&commit->object.oid));
2db1a43f 3142 }
be7db6e5 3143 }
744f4985 3144
252a7c02
LT
3145 switch (simplify_commit(revs, commit)) {
3146 case commit_ignore:
8ecae9b0 3147 continue;
252a7c02 3148 case commit_error:
ed62089c 3149 die("Failed to simplify parents of commit %s",
f2fd0760 3150 oid_to_hex(&commit->object.oid));
252a7c02 3151 default:
1b32dece
NTND
3152 if (revs->track_linear)
3153 track_linear(revs, commit);
252a7c02 3154 return commit;
384e99a4 3155 }
7c2f08aa 3156 }
765ac8ec 3157}
d5db6c9e 3158
be6754c6
MH
3159/*
3160 * Return true for entries that have not yet been shown. (This is an
3161 * object_array_each_func_t.)
3162 */
3163static int entry_unshown(struct object_array_entry *entry, void *cb_data_unused)
86ab4906 3164{
be6754c6
MH
3165 return !(entry->item->flags & SHOWN);
3166}
86ab4906 3167
be6754c6
MH
3168/*
3169 * If array is on the verge of a realloc, garbage-collect any entries
3170 * that have already been shown to try to free up some space.
3171 */
3172static void gc_boundary(struct object_array *array)
3173{
3174 if (array->nr == array->alloc)
3175 object_array_filter(array, entry_unshown, NULL);
86ab4906
JH
3176}
3177
4603ec0f
AS
3178static void create_boundary_commit_list(struct rev_info *revs)
3179{
3180 unsigned i;
3181 struct commit *c;
3182 struct object_array *array = &revs->boundary_commits;
3183 struct object_array_entry *objects = array->objects;
3184
3185 /*
3186 * If revs->commits is non-NULL at this point, an error occurred in
3187 * get_revision_1(). Ignore the error and continue printing the
3188 * boundary commits anyway. (This is what the code has always
3189 * done.)
3190 */
3191 if (revs->commits) {
3192 free_commit_list(revs->commits);
3193 revs->commits = NULL;
3194 }
3195
3196 /*
3197 * Put all of the actual boundary commits from revs->boundary_commits
3198 * into revs->commits
3199 */
3200 for (i = 0; i < array->nr; i++) {
3201 c = (struct commit *)(objects[i].item);
3202 if (!c)
3203 continue;
3204 if (!(c->object.flags & CHILD_SHOWN))
3205 continue;
3206 if (c->object.flags & (SHOWN | BOUNDARY))
3207 continue;
3208 c->object.flags |= BOUNDARY;
3209 commit_list_insert(c, &revs->commits);
3210 }
3211
3212 /*
3213 * If revs->topo_order is set, sort the boundary commits
3214 * in topological order
3215 */
08f704f2 3216 sort_in_topological_order(&revs->commits, revs->sort_order);
4603ec0f
AS
3217}
3218
7fefda5c 3219static struct commit *get_revision_internal(struct rev_info *revs)
d5db6c9e
JH
3220{
3221 struct commit *c = NULL;
86ab4906
JH
3222 struct commit_list *l;
3223
3224 if (revs->boundary == 2) {
4603ec0f
AS
3225 /*
3226 * All of the normal commits have already been returned,
3227 * and we are now returning boundary commits.
3228 * create_boundary_commit_list() has populated
3229 * revs->commits with the remaining commits to return.
3230 */
3231 c = pop_commit(&revs->commits);
3232 if (c)
3233 c->object.flags |= SHOWN;
9c5e66e9
JS
3234 return c;
3235 }
3236
86ab4906 3237 /*
b72a1904
JK
3238 * If our max_count counter has reached zero, then we are done. We
3239 * don't simply return NULL because we still might need to show
3240 * boundary commits. But we want to avoid calling get_revision_1, which
3241 * might do a considerable amount of work finding the next commit only
3242 * for us to throw it away.
3243 *
3244 * If it is non-zero, then either we don't have a max_count at all
3245 * (-1), or it is still counting, in which case we decrement.
86ab4906 3246 */
b72a1904
JK
3247 if (revs->max_count) {
3248 c = get_revision_1(revs);
3249 if (c) {
9e57ac55 3250 while (revs->skip_count > 0) {
b72a1904
JK
3251 revs->skip_count--;
3252 c = get_revision_1(revs);
3253 if (!c)
3254 break;
3255 }
8839ac94 3256 }
86ab4906 3257
b72a1904
JK
3258 if (revs->max_count > 0)
3259 revs->max_count--;
d5db6c9e 3260 }
86ab4906 3261
c33d8593
JH
3262 if (c)
3263 c->object.flags |= SHOWN;
3264
9e57ac55 3265 if (!revs->boundary)
d5db6c9e 3266 return c;
86ab4906
JH
3267
3268 if (!c) {
3269 /*
3270 * get_revision_1() runs out the commits, and
3271 * we are done computing the boundaries.
3272 * switch to boundary commits output mode.
3273 */
3274 revs->boundary = 2;
4603ec0f
AS
3275
3276 /*
3277 * Update revs->commits to contain the list of
3278 * boundary commits.
3279 */
3280 create_boundary_commit_list(revs);
3281
3c68d67b 3282 return get_revision_internal(revs);
86ab4906
JH
3283 }
3284
3285 /*
3286 * boundary commits are the commits that are parents of the
3287 * ones we got from get_revision_1() but they themselves are
3288 * not returned from get_revision_1(). Before returning
3289 * 'c', we need to mark its parents that they could be boundaries.
3290 */
3291
3292 for (l = c->parents; l; l = l->next) {
3293 struct object *p;
3294 p = &(l->item->object);
c33d8593 3295 if (p->flags & (CHILD_SHOWN | SHOWN))
86ab4906
JH
3296 continue;
3297 p->flags |= CHILD_SHOWN;
3298 gc_boundary(&revs->boundary_commits);
3299 add_object_array(p, NULL, &revs->boundary_commits);
3300 }
3301
3302 return c;
d5db6c9e 3303}
7fefda5c
AS
3304
3305struct commit *get_revision(struct rev_info *revs)
3306{
498bcd31
TR
3307 struct commit *c;
3308 struct commit_list *reversed;
3309
3310 if (revs->reverse) {
3311 reversed = NULL;
9e57ac55 3312 while ((c = get_revision_internal(revs)))
498bcd31 3313 commit_list_insert(c, &reversed);
498bcd31
TR
3314 revs->commits = reversed;
3315 revs->reverse = 0;
3316 revs->reverse_output_stage = 1;
3317 }
3318
1b32dece
NTND
3319 if (revs->reverse_output_stage) {
3320 c = pop_commit(&revs->commits);
3321 if (revs->track_linear)
3322 revs->linear = !!(c && c->object.flags & TRACK_LINEAR);
3323 return c;
3324 }
498bcd31
TR
3325
3326 c = get_revision_internal(revs);
7fefda5c
AS
3327 if (c && revs->graph)
3328 graph_update(revs->graph, c);
1b32dece 3329 if (!c) {
53d00b39 3330 free_saved_parents(revs);
1b32dece
NTND
3331 if (revs->previous_parents) {
3332 free_commit_list(revs->previous_parents);
3333 revs->previous_parents = NULL;
3334 }
3335 }
7fefda5c
AS
3336 return c;
3337}
1df2d656
MG
3338
3339char *get_revision_mark(const struct rev_info *revs, const struct commit *commit)
3340{
3341 if (commit->object.flags & BOUNDARY)
3342 return "-";
3343 else if (commit->object.flags & UNINTERESTING)
3344 return "^";
adbbb31e
MG
3345 else if (commit->object.flags & PATCHSAME)
3346 return "=";
1df2d656
MG
3347 else if (!revs || revs->left_right) {
3348 if (commit->object.flags & SYMMETRIC_LEFT)
3349 return "<";
3350 else
3351 return ">";
3352 } else if (revs->graph)
3353 return "*";
adbbb31e
MG
3354 else if (revs->cherry_mark)
3355 return "+";
1df2d656
MG
3356 return "";
3357}
b1b47554
MG
3358
3359void put_revision_mark(const struct rev_info *revs, const struct commit *commit)
3360{
3361 char *mark = get_revision_mark(revs, commit);
3362 if (!strlen(mark))
3363 return;
3364 fputs(mark, stdout);
3365 putchar(' ');
3366}