Make http-fetch request types more clear
[git.git] / rev-list.c
1 #include "cache.h"
2 #include "refs.h"
3 #include "tag.h"
4 #include "commit.h"
5 #include "tree.h"
6 #include "blob.h"
7 #include "epoch.h"
8 #include "diff.h"
9
10 #define SEEN            (1u << 0)
11 #define INTERESTING     (1u << 1)
12 #define COUNTED         (1u << 2)
13 #define SHOWN           (1u << 3)
14 #define TREECHANGE      (1u << 4)
15
16 static const char rev_list_usage[] =
17 "git-rev-list [OPTION] <commit-id>... [ -- paths... ]\n"
18 "  limiting output:\n"
19 "    --max-count=nr\n"
20 "    --max-age=epoch\n"
21 "    --min-age=epoch\n"
22 "    --sparse\n"
23 "    --no-merges\n"
24 "    --all\n"
25 "  ordering output:\n"
26 "    --merge-order [ --show-breaks ]\n"
27 "    --topo-order\n"
28 "  formatting output:\n"
29 "    --parents\n"
30 "    --objects\n"
31 "    --unpacked\n"
32 "    --header | --pretty\n"
33 "  special purpose:\n"
34 "    --bisect"
35 ;
36
37 static int dense = 1;
38 static int unpacked = 0;
39 static int bisect_list = 0;
40 static int tag_objects = 0;
41 static int tree_objects = 0;
42 static int blob_objects = 0;
43 static int verbose_header = 0;
44 static int show_parents = 0;
45 static int hdr_termination = 0;
46 static const char *commit_prefix = "";
47 static unsigned long max_age = -1;
48 static unsigned long min_age = -1;
49 static int max_count = -1;
50 static enum cmit_fmt commit_format = CMIT_FMT_RAW;
51 static int merge_order = 0;
52 static int show_breaks = 0;
53 static int stop_traversal = 0;
54 static int topo_order = 0;
55 static int no_merges = 0;
56 static const char **paths = NULL;
57
58 static void show_commit(struct commit *commit)
59 {
60         commit->object.flags |= SHOWN;
61         if (show_breaks) {
62                 commit_prefix = "| ";
63                 if (commit->object.flags & DISCONTINUITY) {
64                         commit_prefix = "^ ";     
65                 } else if (commit->object.flags & BOUNDARY) {
66                         commit_prefix = "= ";
67                 } 
68         }                       
69         printf("%s%s", commit_prefix, sha1_to_hex(commit->object.sha1));
70         if (show_parents) {
71                 struct commit_list *parents = commit->parents;
72                 while (parents) {
73                         printf(" %s", sha1_to_hex(parents->item->object.sha1));
74                         parents = parents->next;
75                 }
76         }
77         if (commit_format == CMIT_FMT_ONELINE)
78                 putchar(' ');
79         else
80                 putchar('\n');
81
82         if (verbose_header) {
83                 static char pretty_header[16384];
84                 pretty_print_commit(commit_format, commit->buffer, ~0, pretty_header, sizeof(pretty_header));
85                 printf("%s%c", pretty_header, hdr_termination);
86         }
87         fflush(stdout);
88 }
89
90 static int rewrite_one(struct commit **pp)
91 {
92         for (;;) {
93                 struct commit *p = *pp;
94                 if (p->object.flags & (TREECHANGE | UNINTERESTING))
95                         return 0;
96                 if (!p->parents)
97                         return -1;
98                 *pp = p->parents->item;
99         }
100 }
101
102 static void rewrite_parents(struct commit *commit)
103 {
104         struct commit_list **pp = &commit->parents;
105         while (*pp) {
106                 struct commit_list *parent = *pp;
107                 if (rewrite_one(&parent->item) < 0) {
108                         *pp = parent->next;
109                         continue;
110                 }
111                 pp = &parent->next;
112         }
113 }
114
115 static int filter_commit(struct commit * commit)
116 {
117         if (stop_traversal && (commit->object.flags & BOUNDARY))
118                 return STOP;
119         if (commit->object.flags & (UNINTERESTING|SHOWN))
120                 return CONTINUE;
121         if (min_age != -1 && (commit->date > min_age))
122                 return CONTINUE;
123         if (max_age != -1 && (commit->date < max_age)) {
124                 stop_traversal=1;
125                 return CONTINUE;
126         }
127         if (max_count != -1 && !max_count--)
128                 return STOP;
129         if (no_merges && (commit->parents && commit->parents->next))
130                 return CONTINUE;
131         if (paths && dense) {
132                 if (!(commit->object.flags & TREECHANGE))
133                         return CONTINUE;
134                 rewrite_parents(commit);
135         }
136         return DO;
137 }
138
139 static int process_commit(struct commit * commit)
140 {
141         int action=filter_commit(commit);
142
143         if (action == STOP) {
144                 return STOP;
145         }
146
147         if (action == CONTINUE) {
148                 return CONTINUE;
149         }
150
151         show_commit(commit);
152
153         return CONTINUE;
154 }
155
156 static struct object_list **add_object(struct object *obj, struct object_list **p, const char *name)
157 {
158         struct object_list *entry = xmalloc(sizeof(*entry));
159         entry->item = obj;
160         entry->next = *p;
161         entry->name = name;
162         *p = entry;
163         return &entry->next;
164 }
165
166 static struct object_list **process_blob(struct blob *blob, struct object_list **p, const char *name)
167 {
168         struct object *obj = &blob->object;
169
170         if (!blob_objects)
171                 return p;
172         if (obj->flags & (UNINTERESTING | SEEN))
173                 return p;
174         obj->flags |= SEEN;
175         return add_object(obj, p, name);
176 }
177
178 static struct object_list **process_tree(struct tree *tree, struct object_list **p, const char *name)
179 {
180         struct object *obj = &tree->object;
181         struct tree_entry_list *entry;
182
183         if (!tree_objects)
184                 return p;
185         if (obj->flags & (UNINTERESTING | SEEN))
186                 return p;
187         if (parse_tree(tree) < 0)
188                 die("bad tree object %s", sha1_to_hex(obj->sha1));
189         obj->flags |= SEEN;
190         p = add_object(obj, p, name);
191         entry = tree->entries;
192         tree->entries = NULL;
193         while (entry) {
194                 struct tree_entry_list *next = entry->next;
195                 if (entry->directory)
196                         p = process_tree(entry->item.tree, p, entry->name);
197                 else
198                         p = process_blob(entry->item.blob, p, entry->name);
199                 free(entry);
200                 entry = next;
201         }
202         return p;
203 }
204
205 static struct object_list *pending_objects = NULL;
206
207 static void show_commit_list(struct commit_list *list)
208 {
209         struct object_list *objects = NULL, **p = &objects, *pending;
210         while (list) {
211                 struct commit *commit = pop_most_recent_commit(&list, SEEN);
212
213                 p = process_tree(commit->tree, p, "");
214                 if (process_commit(commit) == STOP)
215                         break;
216         }
217         for (pending = pending_objects; pending; pending = pending->next) {
218                 struct object *obj = pending->item;
219                 const char *name = pending->name;
220                 if (obj->flags & (UNINTERESTING | SEEN))
221                         continue;
222                 if (obj->type == tag_type) {
223                         obj->flags |= SEEN;
224                         p = add_object(obj, p, name);
225                         continue;
226                 }
227                 if (obj->type == tree_type) {
228                         p = process_tree((struct tree *)obj, p, name);
229                         continue;
230                 }
231                 if (obj->type == blob_type) {
232                         p = process_blob((struct blob *)obj, p, name);
233                         continue;
234                 }
235                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
236         }
237         while (objects) {
238                 /* An object with name "foo\n0000000000000000000000000000000000000000"
239                  * can be used confuse downstream git-pack-objects very badly.
240                  */
241                 const char *ep = strchr(objects->name, '\n');
242                 if (ep) {
243                         printf("%s %.*s\n", sha1_to_hex(objects->item->sha1),
244                                (int) (ep - objects->name),
245                                objects->name);
246                 }
247                 else
248                         printf("%s %s\n", sha1_to_hex(objects->item->sha1), objects->name);
249                 objects = objects->next;
250         }
251 }
252
253 static void mark_blob_uninteresting(struct blob *blob)
254 {
255         if (!blob_objects)
256                 return;
257         if (blob->object.flags & UNINTERESTING)
258                 return;
259         blob->object.flags |= UNINTERESTING;
260 }
261
262 static void mark_tree_uninteresting(struct tree *tree)
263 {
264         struct object *obj = &tree->object;
265         struct tree_entry_list *entry;
266
267         if (!tree_objects)
268                 return;
269         if (obj->flags & UNINTERESTING)
270                 return;
271         obj->flags |= UNINTERESTING;
272         if (!has_sha1_file(obj->sha1))
273                 return;
274         if (parse_tree(tree) < 0)
275                 die("bad tree %s", sha1_to_hex(obj->sha1));
276         entry = tree->entries;
277         tree->entries = NULL;
278         while (entry) {
279                 struct tree_entry_list *next = entry->next;
280                 if (entry->directory)
281                         mark_tree_uninteresting(entry->item.tree);
282                 else
283                         mark_blob_uninteresting(entry->item.blob);
284                 free(entry);
285                 entry = next;
286         }
287 }
288
289 static void mark_parents_uninteresting(struct commit *commit)
290 {
291         struct commit_list *parents = commit->parents;
292
293         while (parents) {
294                 struct commit *commit = parents->item;
295                 commit->object.flags |= UNINTERESTING;
296
297                 /*
298                  * Normally we haven't parsed the parent
299                  * yet, so we won't have a parent of a parent
300                  * here. However, it may turn out that we've
301                  * reached this commit some other way (where it
302                  * wasn't uninteresting), in which case we need
303                  * to mark its parents recursively too..
304                  */
305                 if (commit->parents)
306                         mark_parents_uninteresting(commit);
307
308                 /*
309                  * A missing commit is ok iff its parent is marked 
310                  * uninteresting.
311                  *
312                  * We just mark such a thing parsed, so that when
313                  * it is popped next time around, we won't be trying
314                  * to parse it and get an error.
315                  */
316                 if (!has_sha1_file(commit->object.sha1))
317                         commit->object.parsed = 1;
318                 parents = parents->next;
319         }
320 }
321
322 static int everybody_uninteresting(struct commit_list *orig)
323 {
324         struct commit_list *list = orig;
325         while (list) {
326                 struct commit *commit = list->item;
327                 list = list->next;
328                 if (commit->object.flags & UNINTERESTING)
329                         continue;
330                 return 0;
331         }
332         return 1;
333 }
334
335 /*
336  * This is a truly stupid algorithm, but it's only
337  * used for bisection, and we just don't care enough.
338  *
339  * We care just barely enough to avoid recursing for
340  * non-merge entries.
341  */
342 static int count_distance(struct commit_list *entry)
343 {
344         int nr = 0;
345
346         while (entry) {
347                 struct commit *commit = entry->item;
348                 struct commit_list *p;
349
350                 if (commit->object.flags & (UNINTERESTING | COUNTED))
351                         break;
352                 nr++;
353                 commit->object.flags |= COUNTED;
354                 p = commit->parents;
355                 entry = p;
356                 if (p) {
357                         p = p->next;
358                         while (p) {
359                                 nr += count_distance(p);
360                                 p = p->next;
361                         }
362                 }
363         }
364         return nr;
365 }
366
367 static void clear_distance(struct commit_list *list)
368 {
369         while (list) {
370                 struct commit *commit = list->item;
371                 commit->object.flags &= ~COUNTED;
372                 list = list->next;
373         }
374 }
375
376 static struct commit_list *find_bisection(struct commit_list *list)
377 {
378         int nr, closest;
379         struct commit_list *p, *best;
380
381         nr = 0;
382         p = list;
383         while (p) {
384                 nr++;
385                 p = p->next;
386         }
387         closest = 0;
388         best = list;
389
390         p = list;
391         while (p) {
392                 int distance = count_distance(p);
393                 clear_distance(list);
394                 if (nr - distance < distance)
395                         distance = nr - distance;
396                 if (distance > closest) {
397                         best = p;
398                         closest = distance;
399                 }
400                 p = p->next;
401         }
402         if (best)
403                 best->next = NULL;
404         return best;
405 }
406
407 static void mark_edges_uninteresting(struct commit_list *list)
408 {
409         for ( ; list; list = list->next) {
410                 struct commit_list *parents = list->item->parents;
411
412                 for ( ; parents; parents = parents->next) {
413                         struct commit *commit = parents->item;
414                         if (commit->object.flags & UNINTERESTING)
415                                 mark_tree_uninteresting(commit->tree);
416                 }
417         }
418 }
419
420 static int is_different = 0;
421
422 static void file_add_remove(struct diff_options *options,
423                     int addremove, unsigned mode,
424                     const unsigned char *sha1,
425                     const char *base, const char *path)
426 {
427         is_different = 1;
428 }
429
430 static void file_change(struct diff_options *options,
431                  unsigned old_mode, unsigned new_mode,
432                  const unsigned char *old_sha1,
433                  const unsigned char *new_sha1,
434                  const char *base, const char *path)
435 {
436         is_different = 1;
437 }
438
439 static struct diff_options diff_opt = {
440         .recursive = 1,
441         .add_remove = file_add_remove,
442         .change = file_change,
443 };
444
445 static int same_tree(struct tree *t1, struct tree *t2)
446 {
447         is_different = 0;
448         if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "", &diff_opt) < 0)
449                 return 0;
450         return !is_different;
451 }
452
453 static int same_tree_as_empty(struct tree *t1)
454 {
455         int retval;
456         void *tree;
457         struct tree_desc empty, real;
458
459         if (!t1)
460                 return 0;
461
462         tree = read_object_with_reference(t1->object.sha1, "tree", &real.size, NULL);
463         if (!tree)
464                 return 0;
465         real.buf = tree;
466
467         empty.buf = "";
468         empty.size = 0;
469
470         is_different = 0;
471         retval = diff_tree(&empty, &real, "", &diff_opt);
472         free(tree);
473
474         return retval >= 0 && !is_different;
475 }
476
477 static struct commit *try_to_simplify_merge(struct commit *commit, struct commit_list *parent)
478 {
479         if (!commit->tree)
480                 return NULL;
481
482         while (parent) {
483                 struct commit *p = parent->item;
484                 parent = parent->next;
485                 parse_commit(p);
486                 if (!p->tree)
487                         continue;
488                 if (same_tree(commit->tree, p->tree))
489                         return p;
490         }
491         return NULL;
492 }
493
494 static void add_parents_to_list(struct commit *commit, struct commit_list **list)
495 {
496         struct commit_list *parent = commit->parents;
497
498         /*
499          * If the commit is uninteresting, don't try to
500          * prune parents - we want the maximal uninteresting
501          * set.
502          *
503          * Normally we haven't parsed the parent
504          * yet, so we won't have a parent of a parent
505          * here. However, it may turn out that we've
506          * reached this commit some other way (where it
507          * wasn't uninteresting), in which case we need
508          * to mark its parents recursively too..
509          */
510         if (commit->object.flags & UNINTERESTING) {
511                 while (parent) {
512                         struct commit *p = parent->item;
513                         parent = parent->next;
514                         parse_commit(p);
515                         p->object.flags |= UNINTERESTING;
516                         if (p->parents)
517                                 mark_parents_uninteresting(p);
518                         if (p->object.flags & SEEN)
519                                 continue;
520                         p->object.flags |= SEEN;
521                         insert_by_date(p, list);
522                 }
523                 return;
524         }
525
526         /*
527          * Ok, the commit wasn't uninteresting. If it
528          * is a merge, try to find the parent that has
529          * no differences in the path set if one exists.
530          */
531         if (paths && parent && parent->next) {
532                 struct commit *preferred;
533
534                 preferred = try_to_simplify_merge(commit, parent);
535                 if (preferred) {
536                         parent->item = preferred;
537                         parent->next = NULL;
538                 }
539         }
540
541         while (parent) {
542                 struct commit *p = parent->item;
543
544                 parent = parent->next;
545
546                 parse_commit(p);
547                 if (p->object.flags & SEEN)
548                         continue;
549                 p->object.flags |= SEEN;
550                 insert_by_date(p, list);
551         }
552 }
553
554 static void compress_list(struct commit_list *list)
555 {
556         while (list) {
557                 struct commit *commit = list->item;
558                 struct commit_list *parent = commit->parents;
559                 list = list->next;
560
561                 if (!parent) {
562                         if (!same_tree_as_empty(commit->tree))
563                                 commit->object.flags |= TREECHANGE;
564                         continue;
565                 }
566
567                 /*
568                  * Exactly one parent? Check if it leaves the tree
569                  * unchanged
570                  */
571                 if (!parent->next) {
572                         struct tree *t1 = commit->tree;
573                         struct tree *t2 = parent->item->tree;
574                         if (!t1 || !t2 || same_tree(t1, t2))
575                                 continue;
576                 }
577                 commit->object.flags |= TREECHANGE;
578         }
579 }
580
581 static struct commit_list *limit_list(struct commit_list *list)
582 {
583         struct commit_list *newlist = NULL;
584         struct commit_list **p = &newlist;
585         while (list) {
586                 struct commit_list *entry = list;
587                 struct commit *commit = list->item;
588                 struct object *obj = &commit->object;
589
590                 list = list->next;
591                 free(entry);
592
593                 if (max_age != -1 && (commit->date < max_age))
594                         obj->flags |= UNINTERESTING;
595                 if (unpacked && has_sha1_pack(obj->sha1))
596                         obj->flags |= UNINTERESTING;
597                 add_parents_to_list(commit, &list);
598                 if (obj->flags & UNINTERESTING) {
599                         mark_parents_uninteresting(commit);
600                         if (everybody_uninteresting(list))
601                                 break;
602                         continue;
603                 }
604                 if (min_age != -1 && (commit->date > min_age))
605                         continue;
606                 p = &commit_list_insert(commit, p)->next;
607         }
608         if (tree_objects)
609                 mark_edges_uninteresting(newlist);
610         if (paths && dense)
611                 compress_list(newlist);
612         if (bisect_list)
613                 newlist = find_bisection(newlist);
614         return newlist;
615 }
616
617 static void add_pending_object(struct object *obj, const char *name)
618 {
619         add_object(obj, &pending_objects, name);
620 }
621
622 static struct commit *get_commit_reference(const char *name, const unsigned char *sha1, unsigned int flags)
623 {
624         struct object *object;
625
626         object = parse_object(sha1);
627         if (!object)
628                 die("bad object %s", name);
629
630         /*
631          * Tag object? Look what it points to..
632          */
633         while (object->type == tag_type) {
634                 struct tag *tag = (struct tag *) object;
635                 object->flags |= flags;
636                 if (tag_objects && !(object->flags & UNINTERESTING))
637                         add_pending_object(object, tag->tag);
638                 object = parse_object(tag->tagged->sha1);
639                 if (!object)
640                         die("bad object %s", sha1_to_hex(tag->tagged->sha1));
641         }
642
643         /*
644          * Commit object? Just return it, we'll do all the complex
645          * reachability crud.
646          */
647         if (object->type == commit_type) {
648                 struct commit *commit = (struct commit *)object;
649                 object->flags |= flags;
650                 if (parse_commit(commit) < 0)
651                         die("unable to parse commit %s", name);
652                 if (flags & UNINTERESTING)
653                         mark_parents_uninteresting(commit);
654                 return commit;
655         }
656
657         /*
658          * Tree object? Either mark it uniniteresting, or add it
659          * to the list of objects to look at later..
660          */
661         if (object->type == tree_type) {
662                 struct tree *tree = (struct tree *)object;
663                 if (!tree_objects)
664                         return NULL;
665                 if (flags & UNINTERESTING) {
666                         mark_tree_uninteresting(tree);
667                         return NULL;
668                 }
669                 add_pending_object(object, "");
670                 return NULL;
671         }
672
673         /*
674          * Blob object? You know the drill by now..
675          */
676         if (object->type == blob_type) {
677                 struct blob *blob = (struct blob *)object;
678                 if (!blob_objects)
679                         return NULL;
680                 if (flags & UNINTERESTING) {
681                         mark_blob_uninteresting(blob);
682                         return NULL;
683                 }
684                 add_pending_object(object, "");
685                 return NULL;
686         }
687         die("%s is unknown object", name);
688 }
689
690 static void handle_one_commit(struct commit *com, struct commit_list **lst)
691 {
692         if (!com || com->object.flags & SEEN)
693                 return;
694         com->object.flags |= SEEN;
695         commit_list_insert(com, lst);
696 }
697
698 /* for_each_ref() callback does not allow user data -- Yuck. */
699 static struct commit_list **global_lst;
700
701 static int include_one_commit(const char *path, const unsigned char *sha1)
702 {
703         struct commit *com = get_commit_reference(path, sha1, 0);
704         handle_one_commit(com, global_lst);
705         return 0;
706 }
707
708 static void handle_all(struct commit_list **lst)
709 {
710         global_lst = lst;
711         for_each_ref(include_one_commit);
712         global_lst = NULL;
713 }
714
715 int main(int argc, const char **argv)
716 {
717         const char *prefix = setup_git_directory();
718         struct commit_list *list = NULL;
719         int i, limited = 0;
720
721         for (i = 1 ; i < argc; i++) {
722                 int flags;
723                 const char *arg = argv[i];
724                 char *dotdot;
725                 struct commit *commit;
726                 unsigned char sha1[20];
727
728                 if (!strncmp(arg, "--max-count=", 12)) {
729                         max_count = atoi(arg + 12);
730                         continue;
731                 }
732                 if (!strncmp(arg, "--max-age=", 10)) {
733                         max_age = atoi(arg + 10);
734                         limited = 1;
735                         continue;
736                 }
737                 if (!strncmp(arg, "--min-age=", 10)) {
738                         min_age = atoi(arg + 10);
739                         limited = 1;
740                         continue;
741                 }
742                 if (!strcmp(arg, "--header")) {
743                         verbose_header = 1;
744                         continue;
745                 }
746                 if (!strncmp(arg, "--pretty", 8)) {
747                         commit_format = get_commit_format(arg+8);
748                         verbose_header = 1;
749                         hdr_termination = '\n';
750                         if (commit_format == CMIT_FMT_ONELINE)
751                                 commit_prefix = "";
752                         else
753                                 commit_prefix = "commit ";
754                         continue;
755                 }
756                 if (!strncmp(arg, "--no-merges", 11)) {
757                         no_merges = 1;
758                         continue;
759                 }
760                 if (!strcmp(arg, "--parents")) {
761                         show_parents = 1;
762                         continue;
763                 }
764                 if (!strcmp(arg, "--bisect")) {
765                         bisect_list = 1;
766                         continue;
767                 }
768                 if (!strcmp(arg, "--all")) {
769                         handle_all(&list);
770                         continue;
771                 }
772                 if (!strcmp(arg, "--objects")) {
773                         tag_objects = 1;
774                         tree_objects = 1;
775                         blob_objects = 1;
776                         continue;
777                 }
778                 if (!strcmp(arg, "--unpacked")) {
779                         unpacked = 1;
780                         limited = 1;
781                         continue;
782                 }
783                 if (!strcmp(arg, "--merge-order")) {
784                         merge_order = 1;
785                         continue;
786                 }
787                 if (!strcmp(arg, "--show-breaks")) {
788                         show_breaks = 1;
789                         continue;
790                 }
791                 if (!strcmp(arg, "--topo-order")) {
792                         topo_order = 1;
793                         limited = 1;
794                         continue;
795                 }
796                 if (!strcmp(arg, "--dense")) {
797                         dense = 1;
798                         continue;
799                 }
800                 if (!strcmp(arg, "--sparse")) {
801                         dense = 0;
802                         continue;
803                 }
804                 if (!strcmp(arg, "--")) {
805                         i++;
806                         break;
807                 }
808
809                 if (show_breaks && !merge_order)
810                         usage(rev_list_usage);
811
812                 flags = 0;
813                 dotdot = strstr(arg, "..");
814                 if (dotdot) {
815                         unsigned char from_sha1[20];
816                         char *next = dotdot + 2;
817                         *dotdot = 0;
818                         if (!*next)
819                                 next = "HEAD";
820                         if (!get_sha1(arg, from_sha1) && !get_sha1(next, sha1)) {
821                                 struct commit *exclude;
822                                 struct commit *include;
823                                 
824                                 exclude = get_commit_reference(arg, from_sha1, UNINTERESTING);
825                                 include = get_commit_reference(next, sha1, 0);
826                                 if (!exclude || !include)
827                                         die("Invalid revision range %s..%s", arg, next);
828                                 limited = 1;
829                                 handle_one_commit(exclude, &list);
830                                 handle_one_commit(include, &list);
831                                 continue;
832                         }
833                         *dotdot = '.';
834                 }
835                 if (*arg == '^') {
836                         flags = UNINTERESTING;
837                         arg++;
838                         limited = 1;
839                 }
840                 if (get_sha1(arg, sha1) < 0)
841                         break;
842                 commit = get_commit_reference(arg, sha1, flags);
843                 handle_one_commit(commit, &list);
844         }
845
846         if (!list)
847                 usage(rev_list_usage);
848
849         paths = get_pathspec(prefix, argv + i);
850         if (paths) {
851                 limited = 1;
852                 diff_tree_setup_paths(paths);
853         }
854
855         save_commit_buffer = verbose_header;
856         track_object_refs = 0;
857
858         if (!merge_order) {             
859                 sort_by_date(&list);
860                 if (list && !limited && max_count == 1 &&
861                     !tag_objects && !tree_objects && !blob_objects) {
862                         show_commit(list->item);
863                         return 0;
864                 }
865                 if (limited)
866                         list = limit_list(list);
867                 if (topo_order)
868                         sort_in_topological_order(&list);
869                 show_commit_list(list);
870         } else {
871 #ifndef NO_OPENSSL
872                 if (sort_list_in_merge_order(list, &process_commit)) {
873                         die("merge order sort failed\n");
874                 }
875 #else
876                 die("merge order sort unsupported, OpenSSL not linked");
877 #endif
878         }
879
880         return 0;
881 }