Tutorial: use a bit longer sample filenames.
[git/git.git] / rev-list.c
CommitLineData
64745109 1#include "cache.h"
36f8d174 2#include "tag.h"
64745109 3#include "commit.h"
9de48752
LT
4#include "tree.h"
5#include "blob.h"
a3437b8c 6#include "epoch.h"
64745109 7
8906300f
LT
8#define SEEN (1u << 0)
9#define INTERESTING (1u << 1)
8b3a1e05 10#define COUNTED (1u << 2)
bce62866 11#define SHOWN (1u << 3)
8906300f 12
a6f68d47 13static const char rev_list_usage[] =
54c6870e 14 "git-rev-list [OPTION] commit-id <commit-id>\n"
a6f68d47
LT
15 " --max-count=nr\n"
16 " --max-age=epoch\n"
17 " --min-age=epoch\n"
12d2a187
LT
18 " --bisect\n"
19 " --objects\n"
20 " --unpacked\n"
9d97aa64 21 " --header\n"
a3437b8c
JS
22 " --pretty\n"
23 " --merge-order [ --show-breaks ]";
a6f68d47 24
12d2a187 25static int unpacked = 0;
8b3a1e05 26static int bisect_list = 0;
3c90f03d 27static int tag_objects = 0;
9de48752
LT
28static int tree_objects = 0;
29static int blob_objects = 0;
81f2bb1f
LT
30static int verbose_header = 0;
31static int show_parents = 0;
81f2bb1f
LT
32static int hdr_termination = 0;
33static const char *prefix = "";
34static unsigned long max_age = -1;
35static unsigned long min_age = -1;
36static int max_count = -1;
000182ea 37static enum cmit_fmt commit_format = CMIT_FMT_RAW;
a3437b8c
JS
38static int merge_order = 0;
39static int show_breaks = 0;
5e749e25 40static int stop_traversal = 0;
d2d02a49 41static int topo_order = 0;
81f2bb1f
LT
42
43static void show_commit(struct commit *commit)
44{
51b1e171 45 commit->object.flags |= SHOWN;
a3437b8c
JS
46 if (show_breaks) {
47 prefix = "| ";
48 if (commit->object.flags & DISCONTINUITY) {
49 prefix = "^ ";
50 } else if (commit->object.flags & BOUNDARY) {
51 prefix = "= ";
52 }
53 }
81f2bb1f
LT
54 printf("%s%s", prefix, sha1_to_hex(commit->object.sha1));
55 if (show_parents) {
56 struct commit_list *parents = commit->parents;
57 while (parents) {
58 printf(" %s", sha1_to_hex(parents->item->object.sha1));
59 parents = parents->next;
60 }
61 }
62 putchar('\n');
63 if (verbose_header) {
000182ea
LT
64 static char pretty_header[16384];
65 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
66 printf("%s%c", pretty_header, hdr_termination);
7620d39f
LT
67 }
68 fflush(stdout);
a3437b8c
JS
69}
70
71static int filter_commit(struct commit * commit)
72{
d2775a81 73 if (stop_traversal && (commit->object.flags & BOUNDARY))
5e749e25 74 return STOP;
51b1e171 75 if (commit->object.flags & (UNINTERESTING|SHOWN))
a3437b8c
JS
76 return CONTINUE;
77 if (min_age != -1 && (commit->date > min_age))
78 return CONTINUE;
5e749e25 79 if (max_age != -1 && (commit->date < max_age)) {
d2775a81
JS
80 stop_traversal=1;
81 return merge_order?CONTINUE:STOP;
5e749e25 82 }
a3437b8c
JS
83 if (max_count != -1 && !max_count--)
84 return STOP;
a3437b8c
JS
85 return DO;
86}
87
88static int process_commit(struct commit * commit)
89{
90 int action=filter_commit(commit);
91
92 if (action == STOP) {
93 return STOP;
94 }
95
96 if (action == CONTINUE) {
97 return CONTINUE;
81f2bb1f 98 }
a3437b8c
JS
99
100 show_commit(commit);
101
102 return CONTINUE;
81f2bb1f
LT
103}
104
9ce43d1c 105static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
9de48752
LT
106{
107 struct object_list *entry = xmalloc(sizeof(*entry));
108 entry->item = obj;
36f8d174 109 entry->next = *p;
9ce43d1c 110 entry->name = name;
9de48752
LT
111 *p = entry;
112 return &entry->next;
113}
114
9ce43d1c 115static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
9de48752
LT
116{
117 struct object *obj = &blob->object;
118
119 if (!blob_objects)
120 return p;
121 if (obj->flags & (UNINTERESTING | SEEN))
122 return p;
123 obj->flags |= SEEN;
9ce43d1c 124 return add_object(obj, p, name);
9de48752
LT
125}
126
9ce43d1c 127static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
9de48752
LT
128{
129 struct object *obj = &tree->object;
130 struct tree_entry_list *entry;
131
132 if (!tree_objects)
133 return p;
134 if (obj->flags & (UNINTERESTING | SEEN))
135 return p;
136 if (parse_tree(tree) < 0)
137 die("bad tree object %s", sha1_to_hex(obj->sha1));
138 obj->flags |= SEEN;
9ce43d1c 139 p = add_object(obj, p, name);
9de48752
LT
140 for (entry = tree->entries ; entry ; entry = entry->next) {
141 if (entry->directory)
9ce43d1c 142 p = process_tree(entry->item.tree, p, entry->name);
9de48752 143 else
9ce43d1c 144 p = process_blob(entry->item.blob, p, entry->name);
9de48752
LT
145 }
146 return p;
147}
148
36f8d174
LT
149static struct object_list *pending_objects = NULL;
150
81f2bb1f
LT
151static void show_commit_list(struct commit_list *list)
152{
36f8d174 153 struct object_list *objects = NULL, **p = &objects, *pending;
81f2bb1f
LT
154 while (list) {
155 struct commit *commit = pop_most_recent_commit(&list, SEEN);
156
9ce43d1c 157 p = process_tree(commit->tree, p, "");
a3437b8c 158 if (process_commit(commit) == STOP)
81f2bb1f 159 break;
81f2bb1f 160 }
36f8d174
LT
161 for (pending = pending_objects; pending; pending = pending->next) {
162 struct object *obj = pending->item;
163 const char *name = pending->name;
164 if (obj->flags & (UNINTERESTING | SEEN))
165 continue;
166 if (obj->type == tag_type) {
167 obj->flags |= SEEN;
168 p = add_object(obj, p, name);
169 continue;
170 }
171 if (obj->type == tree_type) {
172 p = process_tree((struct tree *)obj, p, name);
173 continue;
174 }
175 if (obj->type == blob_type) {
176 p = process_blob((struct blob *)obj, p, name);
177 continue;
178 }
179 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
180 }
9de48752 181 while (objects) {
9ce43d1c 182 printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
9de48752
LT
183 objects = objects->next;
184 }
185}
186
187static void mark_blob_uninteresting(struct blob *blob)
188{
189 if (!blob_objects)
190 return;
191 if (blob->object.flags & UNINTERESTING)
192 return;
193 blob->object.flags |= UNINTERESTING;
194}
195
196static void mark_tree_uninteresting(struct tree *tree)
197{
198 struct object *obj = &tree->object;
199 struct tree_entry_list *entry;
200
201 if (!tree_objects)
202 return;
203 if (obj->flags & UNINTERESTING)
204 return;
205 obj->flags |= UNINTERESTING;
454fbbcd
LT
206 if (!has_sha1_file(obj->sha1))
207 return;
9de48752
LT
208 if (parse_tree(tree) < 0)
209 die("bad tree %s", sha1_to_hex(obj->sha1));
210 entry = tree->entries;
211 while (entry) {
212 if (entry->directory)
213 mark_tree_uninteresting(entry->item.tree);
214 else
215 mark_blob_uninteresting(entry->item.blob);
216 entry = entry->next;
217 }
81f2bb1f
LT
218}
219
8906300f
LT
220static void mark_parents_uninteresting(struct commit *commit)
221{
222 struct commit_list *parents = commit->parents;
223
9de48752
LT
224 if (tree_objects)
225 mark_tree_uninteresting(commit->tree);
8906300f
LT
226 while (parents) {
227 struct commit *commit = parents->item;
228 commit->object.flags |= UNINTERESTING;
454fbbcd
LT
229
230 /*
231 * A missing commit is ok iff its parent is marked
232 * uninteresting.
233 *
234 * We just mark such a thing parsed, so that when
235 * it is popped next time around, we won't be trying
236 * to parse it and get an error.
237 */
238 if (!has_sha1_file(commit->object.sha1))
239 commit->object.parsed = 1;
8906300f
LT
240 parents = parents->next;
241 }
242}
243
4311d328 244static int everybody_uninteresting(struct commit_list *orig)
8906300f 245{
4311d328 246 struct commit_list *list = orig;
8906300f
LT
247 while (list) {
248 struct commit *commit = list->item;
249 list = list->next;
250 if (commit->object.flags & UNINTERESTING)
251 continue;
252 return 0;
253 }
4311d328
LT
254
255 /*
256 * Ok, go back and mark all the edge trees uninteresting,
257 * since otherwise we can have situations where a parent
258 * that was marked uninteresting (and we never even had
259 * to look at) had lots of objects that we don't want to
260 * include.
261 *
262 * NOTE! This still doesn't mean that the object list is
263 * "correct", since we may end up listing objects that
264 * even older commits (that we don't list) do actually
265 * reference, but it gets us to a minimal list (or very
266 * close) in practice.
267 */
268 if (!tree_objects)
269 return 1;
270
271 while (orig) {
272 struct commit *commit = orig->item;
273 if (!parse_commit(commit) && commit->tree)
274 mark_tree_uninteresting(commit->tree);
275 orig = orig->next;
276 }
8906300f
LT
277 return 1;
278}
279
8b3a1e05
LT
280/*
281 * This is a truly stupid algorithm, but it's only
282 * used for bisection, and we just don't care enough.
283 *
284 * We care just barely enough to avoid recursing for
285 * non-merge entries.
286 */
287static int count_distance(struct commit_list *entry)
288{
289 int nr = 0;
290
291 while (entry) {
292 struct commit *commit = entry->item;
293 struct commit_list *p;
294
295 if (commit->object.flags & (UNINTERESTING | COUNTED))
296 break;
297 nr++;
298 commit->object.flags |= COUNTED;
299 p = commit->parents;
300 entry = p;
301 if (p) {
302 p = p->next;
303 while (p) {
304 nr += count_distance(p);
305 p = p->next;
306 }
307 }
308 }
309 return nr;
310}
311
3d958064 312static void clear_distance(struct commit_list *list)
8b3a1e05
LT
313{
314 while (list) {
315 struct commit *commit = list->item;
316 commit->object.flags &= ~COUNTED;
317 list = list->next;
318 }
319}
320
321static struct commit_list *find_bisection(struct commit_list *list)
322{
323 int nr, closest;
324 struct commit_list *p, *best;
325
326 nr = 0;
327 p = list;
328 while (p) {
329 nr++;
330 p = p->next;
331 }
332 closest = 0;
333 best = list;
334
335 p = list;
336 while (p) {
337 int distance = count_distance(p);
338 clear_distance(list);
339 if (nr - distance < distance)
340 distance = nr - distance;
341 if (distance > closest) {
342 best = p;
343 closest = distance;
344 }
345 p = p->next;
346 }
347 if (best)
348 best->next = NULL;
349 return best;
350}
351
6da4016a 352static struct commit_list *limit_list(struct commit_list *list)
3b42a63c
LT
353{
354 struct commit_list *newlist = NULL;
355 struct commit_list **p = &newlist;
36f8d174 356 while (list) {
3b42a63c
LT
357 struct commit *commit = pop_most_recent_commit(&list, SEEN);
358 struct object *obj = &commit->object;
359
12d2a187
LT
360 if (unpacked && has_sha1_pack(obj->sha1))
361 obj->flags |= UNINTERESTING;
337cb3fb 362 if (obj->flags & UNINTERESTING) {
3b42a63c
LT
363 mark_parents_uninteresting(commit);
364 if (everybody_uninteresting(list))
365 break;
366 continue;
367 }
368 p = &commit_list_insert(commit, p)->next;
36f8d174 369 }
8b3a1e05
LT
370 if (bisect_list)
371 newlist = find_bisection(newlist);
3b42a63c
LT
372 return newlist;
373}
374
36f8d174
LT
375static void add_pending_object(struct object *obj, const char *name)
376{
377 add_object(obj, &pending_objects, name);
378}
379
3c90f03d
LT
380static struct commit *get_commit_reference(const char *name, unsigned int flags)
381{
382 unsigned char sha1[20];
36f8d174 383 struct object *object;
3c90f03d
LT
384
385 if (get_sha1(name, sha1))
386 usage(rev_list_usage);
36f8d174
LT
387 object = parse_object(sha1);
388 if (!object)
389 die("bad object %s", name);
390
391 /*
392 * Tag object? Look what it points to..
393 */
013aab82 394 while (object->type == tag_type) {
36f8d174
LT
395 struct tag *tag = (struct tag *) object;
396 object->flags |= flags;
397 if (tag_objects && !(object->flags & UNINTERESTING))
398 add_pending_object(object, tag->tag);
013aab82 399 object = parse_object(tag->tagged->sha1);
36f8d174
LT
400 }
401
402 /*
403 * Commit object? Just return it, we'll do all the complex
404 * reachability crud.
405 */
406 if (object->type == commit_type) {
407 struct commit *commit = (struct commit *)object;
408 object->flags |= flags;
409 if (parse_commit(commit) < 0)
410 die("unable to parse commit %s", name);
454fbbcd
LT
411 if (flags & UNINTERESTING)
412 mark_parents_uninteresting(commit);
36f8d174
LT
413 return commit;
414 }
415
416 /*
417 * Tree object? Either mark it uniniteresting, or add it
418 * to the list of objects to look at later..
419 */
420 if (object->type == tree_type) {
421 struct tree *tree = (struct tree *)object;
422 if (!tree_objects)
960bba0d 423 return NULL;
36f8d174
LT
424 if (flags & UNINTERESTING) {
425 mark_tree_uninteresting(tree);
426 return NULL;
427 }
428 add_pending_object(object, "");
429 return NULL;
430 }
431
432 /*
433 * Blob object? You know the drill by now..
434 */
435 if (object->type == blob_type) {
436 struct blob *blob = (struct blob *)object;
437 if (!blob_objects)
960bba0d 438 return NULL;
36f8d174
LT
439 if (flags & UNINTERESTING) {
440 mark_blob_uninteresting(blob);
441 return NULL;
442 }
443 add_pending_object(object, "");
444 return NULL;
445 }
446 die("%s is unknown object", name);
3c90f03d
LT
447}
448
64745109
LT
449int main(int argc, char **argv)
450{
64745109 451 struct commit_list *list = NULL;
337cb3fb 452 int i, limited = 0;
64745109 453
fcfda02b 454 for (i = 1 ; i < argc; i++) {
337cb3fb 455 int flags;
fcfda02b 456 char *arg = argv[i];
337cb3fb 457 struct commit *commit;
fcfda02b
KS
458
459 if (!strncmp(arg, "--max-count=", 12)) {
460 max_count = atoi(arg + 12);
a6f68d47
LT
461 continue;
462 }
463 if (!strncmp(arg, "--max-age=", 10)) {
fcfda02b 464 max_age = atoi(arg + 10);
a6f68d47
LT
465 continue;
466 }
467 if (!strncmp(arg, "--min-age=", 10)) {
fcfda02b 468 min_age = atoi(arg + 10);
a6f68d47 469 continue;
fcfda02b 470 }
a6f68d47
LT
471 if (!strcmp(arg, "--header")) {
472 verbose_header = 1;
473 continue;
474 }
000182ea
LT
475 if (!strncmp(arg, "--pretty", 8)) {
476 commit_format = get_commit_format(arg+8);
9d97aa64 477 verbose_header = 1;
9d97aa64
LT
478 hdr_termination = '\n';
479 prefix = "commit ";
480 continue;
481 }
97658004
LT
482 if (!strcmp(arg, "--parents")) {
483 show_parents = 1;
484 continue;
485 }
8b3a1e05
LT
486 if (!strcmp(arg, "--bisect")) {
487 bisect_list = 1;
488 continue;
489 }
9de48752 490 if (!strcmp(arg, "--objects")) {
3c90f03d 491 tag_objects = 1;
9de48752
LT
492 tree_objects = 1;
493 blob_objects = 1;
494 continue;
495 }
12d2a187
LT
496 if (!strcmp(arg, "--unpacked")) {
497 unpacked = 1;
498 limited = 1;
499 continue;
500 }
12ba7eaf 501 if (!strcmp(arg, "--merge-order")) {
a3437b8c
JS
502 merge_order = 1;
503 continue;
504 }
12ba7eaf 505 if (!strcmp(arg, "--show-breaks")) {
a3437b8c
JS
506 show_breaks = 1;
507 continue;
508 }
d2d02a49
LT
509 if (!strcmp(arg, "--topo-order")) {
510 topo_order = 1;
e6c3505b 511 limited = 1;
d2d02a49
LT
512 continue;
513 }
a6f68d47 514
337cb3fb
LT
515 flags = 0;
516 if (*arg == '^') {
517 flags = UNINTERESTING;
518 arg++;
519 limited = 1;
520 }
3c90f03d 521 if (show_breaks && !merge_order)
a6f68d47 522 usage(rev_list_usage);
3c90f03d
LT
523 commit = get_commit_reference(arg, flags);
524 if (!commit)
525 continue;
960cea2d 526 if (commit->object.flags & SEEN)
bce62866 527 continue;
960cea2d 528 commit->object.flags |= SEEN;
a7336ae5 529 commit_list_insert(commit, &list);
fcfda02b
KS
530 }
531
a3437b8c 532 if (!merge_order) {
a7336ae5 533 sort_by_date(&list);
17ebe977 534 if (limited)
a3437b8c 535 list = limit_list(list);
d2d02a49
LT
536 if (topo_order)
537 sort_in_topological_order(&list);
a3437b8c 538 show_commit_list(list);
a3437b8c 539 } else {
a3437b8c
JS
540 if (sort_list_in_merge_order(list, &process_commit)) {
541 die("merge order sort failed\n");
542 }
a3437b8c 543 }
8906300f 544
64745109
LT
545 return 0;
546}