pack-objects: walk tag chains for --include-tag
[git] / builtin / show-branch.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "refs.h"
4 #include "builtin.h"
5 #include "color.h"
6 #include "argv-array.h"
7 #include "parse-options.h"
8
9 static const char* show_branch_usage[] = {
10     N_("git show-branch [-a | --all] [-r | --remotes] [--topo-order | --date-order]\n"
11        "                [--current] [--color[=<when>] | --no-color] [--sparse]\n"
12        "                [--more=<n> | --list | --independent | --merge-base]\n"
13        "                [--no-name | --sha1-name] [--topics] [(<rev> | <glob>)...]"),
14     N_("git show-branch (-g | --reflog)[=<n>[,<base>]] [--list] [<ref>]"),
15     NULL
16 };
17
18 static int showbranch_use_color = -1;
19
20 static struct argv_array default_args = ARGV_ARRAY_INIT;
21
22 #define UNINTERESTING   01
23
24 #define REV_SHIFT        2
25 #define MAX_REVS        (FLAG_BITS - REV_SHIFT) /* should not exceed bits_per_int - REV_SHIFT */
26
27 #define DEFAULT_REFLOG  4
28
29 static const char *get_color_code(int idx)
30 {
31         if (want_color(showbranch_use_color))
32                 return column_colors_ansi[idx % column_colors_ansi_max];
33         return "";
34 }
35
36 static const char *get_color_reset_code(void)
37 {
38         if (want_color(showbranch_use_color))
39                 return GIT_COLOR_RESET;
40         return "";
41 }
42
43 static struct commit *interesting(struct commit_list *list)
44 {
45         while (list) {
46                 struct commit *commit = list->item;
47                 list = list->next;
48                 if (commit->object.flags & UNINTERESTING)
49                         continue;
50                 return commit;
51         }
52         return NULL;
53 }
54
55 struct commit_name {
56         const char *head_name; /* which head's ancestor? */
57         int generation; /* how many parents away from head_name */
58 };
59
60 /* Name the commit as nth generation ancestor of head_name;
61  * we count only the first-parent relationship for naming purposes.
62  */
63 static void name_commit(struct commit *commit, const char *head_name, int nth)
64 {
65         struct commit_name *name;
66         if (!commit->util)
67                 commit->util = xmalloc(sizeof(struct commit_name));
68         name = commit->util;
69         name->head_name = head_name;
70         name->generation = nth;
71 }
72
73 /* Parent is the first parent of the commit.  We may name it
74  * as (n+1)th generation ancestor of the same head_name as
75  * commit is nth generation ancestor of, if that generation
76  * number is better than the name it already has.
77  */
78 static void name_parent(struct commit *commit, struct commit *parent)
79 {
80         struct commit_name *commit_name = commit->util;
81         struct commit_name *parent_name = parent->util;
82         if (!commit_name)
83                 return;
84         if (!parent_name ||
85             commit_name->generation + 1 < parent_name->generation)
86                 name_commit(parent, commit_name->head_name,
87                             commit_name->generation + 1);
88 }
89
90 static int name_first_parent_chain(struct commit *c)
91 {
92         int i = 0;
93         while (c) {
94                 struct commit *p;
95                 if (!c->util)
96                         break;
97                 if (!c->parents)
98                         break;
99                 p = c->parents->item;
100                 if (!p->util) {
101                         name_parent(c, p);
102                         i++;
103                 }
104                 else
105                         break;
106                 c = p;
107         }
108         return i;
109 }
110
111 static void name_commits(struct commit_list *list,
112                          struct commit **rev,
113                          char **ref_name,
114                          int num_rev)
115 {
116         struct commit_list *cl;
117         struct commit *c;
118         int i;
119
120         /* First give names to the given heads */
121         for (cl = list; cl; cl = cl->next) {
122                 c = cl->item;
123                 if (c->util)
124                         continue;
125                 for (i = 0; i < num_rev; i++) {
126                         if (rev[i] == c) {
127                                 name_commit(c, ref_name[i], 0);
128                                 break;
129                         }
130                 }
131         }
132
133         /* Then commits on the first parent ancestry chain */
134         do {
135                 i = 0;
136                 for (cl = list; cl; cl = cl->next) {
137                         i += name_first_parent_chain(cl->item);
138                 }
139         } while (i);
140
141         /* Finally, any unnamed commits */
142         do {
143                 i = 0;
144                 for (cl = list; cl; cl = cl->next) {
145                         struct commit_list *parents;
146                         struct commit_name *n;
147                         int nth;
148                         c = cl->item;
149                         if (!c->util)
150                                 continue;
151                         n = c->util;
152                         parents = c->parents;
153                         nth = 0;
154                         while (parents) {
155                                 struct commit *p = parents->item;
156                                 struct strbuf newname = STRBUF_INIT;
157                                 parents = parents->next;
158                                 nth++;
159                                 if (p->util)
160                                         continue;
161                                 switch (n->generation) {
162                                 case 0:
163                                         strbuf_addstr(&newname, n->head_name);
164                                         break;
165                                 case 1:
166                                         strbuf_addf(&newname, "%s^", n->head_name);
167                                         break;
168                                 default:
169                                         strbuf_addf(&newname, "%s~%d",
170                                                     n->head_name, n->generation);
171                                         break;
172                                 }
173                                 if (nth == 1)
174                                         strbuf_addch(&newname, '^');
175                                 else
176                                         strbuf_addf(&newname, "^%d", nth);
177                                 name_commit(p, strbuf_detach(&newname, NULL), 0);
178                                 i++;
179                                 name_first_parent_chain(p);
180                         }
181                 }
182         } while (i);
183 }
184
185 static int mark_seen(struct commit *commit, struct commit_list **seen_p)
186 {
187         if (!commit->object.flags) {
188                 commit_list_insert(commit, seen_p);
189                 return 1;
190         }
191         return 0;
192 }
193
194 static void join_revs(struct commit_list **list_p,
195                       struct commit_list **seen_p,
196                       int num_rev, int extra)
197 {
198         int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
199         int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
200
201         while (*list_p) {
202                 struct commit_list *parents;
203                 int still_interesting = !!interesting(*list_p);
204                 struct commit *commit = pop_commit(list_p);
205                 int flags = commit->object.flags & all_mask;
206
207                 if (!still_interesting && extra <= 0)
208                         break;
209
210                 mark_seen(commit, seen_p);
211                 if ((flags & all_revs) == all_revs)
212                         flags |= UNINTERESTING;
213                 parents = commit->parents;
214
215                 while (parents) {
216                         struct commit *p = parents->item;
217                         int this_flag = p->object.flags;
218                         parents = parents->next;
219                         if ((this_flag & flags) == flags)
220                                 continue;
221                         parse_commit(p);
222                         if (mark_seen(p, seen_p) && !still_interesting)
223                                 extra--;
224                         p->object.flags |= flags;
225                         commit_list_insert_by_date(p, list_p);
226                 }
227         }
228
229         /*
230          * Postprocess to complete well-poisoning.
231          *
232          * At this point we have all the commits we have seen in
233          * seen_p list.  Mark anything that can be reached from
234          * uninteresting commits not interesting.
235          */
236         for (;;) {
237                 int changed = 0;
238                 struct commit_list *s;
239                 for (s = *seen_p; s; s = s->next) {
240                         struct commit *c = s->item;
241                         struct commit_list *parents;
242
243                         if (((c->object.flags & all_revs) != all_revs) &&
244                             !(c->object.flags & UNINTERESTING))
245                                 continue;
246
247                         /* The current commit is either a merge base or
248                          * already uninteresting one.  Mark its parents
249                          * as uninteresting commits _only_ if they are
250                          * already parsed.  No reason to find new ones
251                          * here.
252                          */
253                         parents = c->parents;
254                         while (parents) {
255                                 struct commit *p = parents->item;
256                                 parents = parents->next;
257                                 if (!(p->object.flags & UNINTERESTING)) {
258                                         p->object.flags |= UNINTERESTING;
259                                         changed = 1;
260                                 }
261                         }
262                 }
263                 if (!changed)
264                         break;
265         }
266 }
267
268 static void show_one_commit(struct commit *commit, int no_name)
269 {
270         struct strbuf pretty = STRBUF_INIT;
271         const char *pretty_str = "(unavailable)";
272         struct commit_name *name = commit->util;
273
274         if (commit->object.parsed) {
275                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &pretty);
276                 pretty_str = pretty.buf;
277         }
278         if (starts_with(pretty_str, "[PATCH] "))
279                 pretty_str += 8;
280
281         if (!no_name) {
282                 if (name && name->head_name) {
283                         printf("[%s", name->head_name);
284                         if (name->generation) {
285                                 if (name->generation == 1)
286                                         printf("^");
287                                 else
288                                         printf("~%d", name->generation);
289                         }
290                         printf("] ");
291                 }
292                 else
293                         printf("[%s] ",
294                                find_unique_abbrev(commit->object.oid.hash,
295                                                   DEFAULT_ABBREV));
296         }
297         puts(pretty_str);
298         strbuf_release(&pretty);
299 }
300
301 static char *ref_name[MAX_REVS + 1];
302 static int ref_name_cnt;
303
304 static const char *find_digit_prefix(const char *s, int *v)
305 {
306         const char *p;
307         int ver;
308         char ch;
309
310         for (p = s, ver = 0;
311              '0' <= (ch = *p) && ch <= '9';
312              p++)
313                 ver = ver * 10 + ch - '0';
314         *v = ver;
315         return p;
316 }
317
318
319 static int version_cmp(const char *a, const char *b)
320 {
321         while (1) {
322                 int va, vb;
323
324                 a = find_digit_prefix(a, &va);
325                 b = find_digit_prefix(b, &vb);
326                 if (va != vb)
327                         return va - vb;
328
329                 while (1) {
330                         int ca = *a;
331                         int cb = *b;
332                         if ('0' <= ca && ca <= '9')
333                                 ca = 0;
334                         if ('0' <= cb && cb <= '9')
335                                 cb = 0;
336                         if (ca != cb)
337                                 return ca - cb;
338                         if (!ca)
339                                 break;
340                         a++;
341                         b++;
342                 }
343                 if (!*a && !*b)
344                         return 0;
345         }
346 }
347
348 static int compare_ref_name(const void *a_, const void *b_)
349 {
350         const char * const*a = a_, * const*b = b_;
351         return version_cmp(*a, *b);
352 }
353
354 static void sort_ref_range(int bottom, int top)
355 {
356         qsort(ref_name + bottom, top - bottom, sizeof(ref_name[0]),
357               compare_ref_name);
358 }
359
360 static int append_ref(const char *refname, const struct object_id *oid,
361                       int allow_dups)
362 {
363         struct commit *commit = lookup_commit_reference_gently(oid->hash, 1);
364         int i;
365
366         if (!commit)
367                 return 0;
368
369         if (!allow_dups) {
370                 /* Avoid adding the same thing twice */
371                 for (i = 0; i < ref_name_cnt; i++)
372                         if (!strcmp(refname, ref_name[i]))
373                                 return 0;
374         }
375         if (MAX_REVS <= ref_name_cnt) {
376                 warning("ignoring %s; cannot handle more than %d refs",
377                         refname, MAX_REVS);
378                 return 0;
379         }
380         ref_name[ref_name_cnt++] = xstrdup(refname);
381         ref_name[ref_name_cnt] = NULL;
382         return 0;
383 }
384
385 static int append_head_ref(const char *refname, const struct object_id *oid,
386                            int flag, void *cb_data)
387 {
388         struct object_id tmp;
389         int ofs = 11;
390         if (!starts_with(refname, "refs/heads/"))
391                 return 0;
392         /* If both heads/foo and tags/foo exists, get_sha1 would
393          * get confused.
394          */
395         if (get_sha1(refname + ofs, tmp.hash) || oidcmp(&tmp, oid))
396                 ofs = 5;
397         return append_ref(refname + ofs, oid, 0);
398 }
399
400 static int append_remote_ref(const char *refname, const struct object_id *oid,
401                              int flag, void *cb_data)
402 {
403         struct object_id tmp;
404         int ofs = 13;
405         if (!starts_with(refname, "refs/remotes/"))
406                 return 0;
407         /* If both heads/foo and tags/foo exists, get_sha1 would
408          * get confused.
409          */
410         if (get_sha1(refname + ofs, tmp.hash) || oidcmp(&tmp, oid))
411                 ofs = 5;
412         return append_ref(refname + ofs, oid, 0);
413 }
414
415 static int append_tag_ref(const char *refname, const struct object_id *oid,
416                           int flag, void *cb_data)
417 {
418         if (!starts_with(refname, "refs/tags/"))
419                 return 0;
420         return append_ref(refname + 5, oid, 0);
421 }
422
423 static const char *match_ref_pattern = NULL;
424 static int match_ref_slash = 0;
425 static int count_slash(const char *s)
426 {
427         int cnt = 0;
428         while (*s)
429                 if (*s++ == '/')
430                         cnt++;
431         return cnt;
432 }
433
434 static int append_matching_ref(const char *refname, const struct object_id *oid,
435                                int flag, void *cb_data)
436 {
437         /* we want to allow pattern hold/<asterisk> to show all
438          * branches under refs/heads/hold/, and v0.99.9? to show
439          * refs/tags/v0.99.9a and friends.
440          */
441         const char *tail;
442         int slash = count_slash(refname);
443         for (tail = refname; *tail && match_ref_slash < slash; )
444                 if (*tail++ == '/')
445                         slash--;
446         if (!*tail)
447                 return 0;
448         if (wildmatch(match_ref_pattern, tail, 0, NULL))
449                 return 0;
450         if (starts_with(refname, "refs/heads/"))
451                 return append_head_ref(refname, oid, flag, cb_data);
452         if (starts_with(refname, "refs/tags/"))
453                 return append_tag_ref(refname, oid, flag, cb_data);
454         return append_ref(refname, oid, 0);
455 }
456
457 static void snarf_refs(int head, int remotes)
458 {
459         if (head) {
460                 int orig_cnt = ref_name_cnt;
461
462                 for_each_ref(append_head_ref, NULL);
463                 sort_ref_range(orig_cnt, ref_name_cnt);
464         }
465         if (remotes) {
466                 int orig_cnt = ref_name_cnt;
467
468                 for_each_ref(append_remote_ref, NULL);
469                 sort_ref_range(orig_cnt, ref_name_cnt);
470         }
471 }
472
473 static int rev_is_head(char *head, int headlen, char *name,
474                        unsigned char *head_sha1, unsigned char *sha1)
475 {
476         if ((!head[0]) ||
477             (head_sha1 && sha1 && hashcmp(head_sha1, sha1)))
478                 return 0;
479         if (starts_with(head, "refs/heads/"))
480                 head += 11;
481         if (starts_with(name, "refs/heads/"))
482                 name += 11;
483         else if (starts_with(name, "heads/"))
484                 name += 6;
485         return !strcmp(head, name);
486 }
487
488 static int show_merge_base(struct commit_list *seen, int num_rev)
489 {
490         int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
491         int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
492         int exit_status = 1;
493
494         while (seen) {
495                 struct commit *commit = pop_commit(&seen);
496                 int flags = commit->object.flags & all_mask;
497                 if (!(flags & UNINTERESTING) &&
498                     ((flags & all_revs) == all_revs)) {
499                         puts(oid_to_hex(&commit->object.oid));
500                         exit_status = 0;
501                         commit->object.flags |= UNINTERESTING;
502                 }
503         }
504         return exit_status;
505 }
506
507 static int show_independent(struct commit **rev,
508                             int num_rev,
509                             char **ref_name,
510                             unsigned int *rev_mask)
511 {
512         int i;
513
514         for (i = 0; i < num_rev; i++) {
515                 struct commit *commit = rev[i];
516                 unsigned int flag = rev_mask[i];
517
518                 if (commit->object.flags == flag)
519                         puts(oid_to_hex(&commit->object.oid));
520                 commit->object.flags |= UNINTERESTING;
521         }
522         return 0;
523 }
524
525 static void append_one_rev(const char *av)
526 {
527         struct object_id revkey;
528         if (!get_sha1(av, revkey.hash)) {
529                 append_ref(av, &revkey, 0);
530                 return;
531         }
532         if (strchr(av, '*') || strchr(av, '?') || strchr(av, '[')) {
533                 /* glob style match */
534                 int saved_matches = ref_name_cnt;
535
536                 match_ref_pattern = av;
537                 match_ref_slash = count_slash(av);
538                 for_each_ref(append_matching_ref, NULL);
539                 if (saved_matches == ref_name_cnt &&
540                     ref_name_cnt < MAX_REVS)
541                         error("no matching refs with %s", av);
542                 if (saved_matches + 1 < ref_name_cnt)
543                         sort_ref_range(saved_matches, ref_name_cnt);
544                 return;
545         }
546         die("bad sha1 reference %s", av);
547 }
548
549 static int git_show_branch_config(const char *var, const char *value, void *cb)
550 {
551         if (!strcmp(var, "showbranch.default")) {
552                 if (!value)
553                         return config_error_nonbool(var);
554                 /*
555                  * default_arg is now passed to parse_options(), so we need to
556                  * mimic the real argv a bit better.
557                  */
558                 if (!default_args.argc)
559                         argv_array_push(&default_args, "show-branch");
560                 argv_array_push(&default_args, value);
561                 return 0;
562         }
563
564         if (!strcmp(var, "color.showbranch")) {
565                 showbranch_use_color = git_config_colorbool(var, value);
566                 return 0;
567         }
568
569         return git_color_default_config(var, value, cb);
570 }
571
572 static int omit_in_dense(struct commit *commit, struct commit **rev, int n)
573 {
574         /* If the commit is tip of the named branches, do not
575          * omit it.
576          * Otherwise, if it is a merge that is reachable from only one
577          * tip, it is not that interesting.
578          */
579         int i, flag, count;
580         for (i = 0; i < n; i++)
581                 if (rev[i] == commit)
582                         return 0;
583         flag = commit->object.flags;
584         for (i = count = 0; i < n; i++) {
585                 if (flag & (1u << (i + REV_SHIFT)))
586                         count++;
587         }
588         if (count == 1)
589                 return 1;
590         return 0;
591 }
592
593 static int reflog = 0;
594
595 static int parse_reflog_param(const struct option *opt, const char *arg,
596                               int unset)
597 {
598         char *ep;
599         const char **base = (const char **)opt->value;
600         if (!arg)
601                 arg = "";
602         reflog = strtoul(arg, &ep, 10);
603         if (*ep == ',')
604                 *base = ep + 1;
605         else if (*ep)
606                 return error("unrecognized reflog param '%s'", arg);
607         else
608                 *base = NULL;
609         if (reflog <= 0)
610                 reflog = DEFAULT_REFLOG;
611         return 0;
612 }
613
614 int cmd_show_branch(int ac, const char **av, const char *prefix)
615 {
616         struct commit *rev[MAX_REVS], *commit;
617         char *reflog_msg[MAX_REVS];
618         struct commit_list *list = NULL, *seen = NULL;
619         unsigned int rev_mask[MAX_REVS];
620         int num_rev, i, extra = 0;
621         int all_heads = 0, all_remotes = 0;
622         int all_mask, all_revs;
623         enum rev_sort_order sort_order = REV_SORT_IN_GRAPH_ORDER;
624         char head[128];
625         const char *head_p;
626         int head_len;
627         struct object_id head_oid;
628         int merge_base = 0;
629         int independent = 0;
630         int no_name = 0;
631         int sha1_name = 0;
632         int shown_merge_point = 0;
633         int with_current_branch = 0;
634         int head_at = -1;
635         int topics = 0;
636         int dense = 1;
637         const char *reflog_base = NULL;
638         struct option builtin_show_branch_options[] = {
639                 OPT_BOOL('a', "all", &all_heads,
640                          N_("show remote-tracking and local branches")),
641                 OPT_BOOL('r', "remotes", &all_remotes,
642                          N_("show remote-tracking branches")),
643                 OPT__COLOR(&showbranch_use_color,
644                             N_("color '*!+-' corresponding to the branch")),
645                 { OPTION_INTEGER, 0, "more", &extra, N_("n"),
646                             N_("show <n> more commits after the common ancestor"),
647                             PARSE_OPT_OPTARG, NULL, (intptr_t)1 },
648                 OPT_SET_INT(0, "list", &extra, N_("synonym to more=-1"), -1),
649                 OPT_BOOL(0, "no-name", &no_name, N_("suppress naming strings")),
650                 OPT_BOOL(0, "current", &with_current_branch,
651                          N_("include the current branch")),
652                 OPT_BOOL(0, "sha1-name", &sha1_name,
653                          N_("name commits with their object names")),
654                 OPT_BOOL(0, "merge-base", &merge_base,
655                          N_("show possible merge bases")),
656                 OPT_BOOL(0, "independent", &independent,
657                             N_("show refs unreachable from any other ref")),
658                 OPT_SET_INT(0, "topo-order", &sort_order,
659                             N_("show commits in topological order"),
660                             REV_SORT_IN_GRAPH_ORDER),
661                 OPT_BOOL(0, "topics", &topics,
662                          N_("show only commits not on the first branch")),
663                 OPT_SET_INT(0, "sparse", &dense,
664                             N_("show merges reachable from only one tip"), 0),
665                 OPT_SET_INT(0, "date-order", &sort_order,
666                             N_("topologically sort, maintaining date order "
667                                "where possible"),
668                             REV_SORT_BY_COMMIT_DATE),
669                 { OPTION_CALLBACK, 'g', "reflog", &reflog_base, N_("<n>[,<base>]"),
670                             N_("show <n> most recent ref-log entries starting at "
671                                "base"),
672                             PARSE_OPT_OPTARG | PARSE_OPT_LITERAL_ARGHELP,
673                             parse_reflog_param },
674                 OPT_END()
675         };
676
677         git_config(git_show_branch_config, NULL);
678
679         /* If nothing is specified, try the default first */
680         if (ac == 1 && default_args.argc) {
681                 ac = default_args.argc;
682                 av = default_args.argv;
683         }
684
685         ac = parse_options(ac, av, prefix, builtin_show_branch_options,
686                            show_branch_usage, PARSE_OPT_STOP_AT_NON_OPTION);
687         if (all_heads)
688                 all_remotes = 1;
689
690         if (extra || reflog) {
691                 /* "listing" mode is incompatible with
692                  * independent nor merge-base modes.
693                  */
694                 if (independent || merge_base)
695                         usage_with_options(show_branch_usage,
696                                            builtin_show_branch_options);
697                 if (reflog && ((0 < extra) || all_heads || all_remotes))
698                         /*
699                          * Asking for --more in reflog mode does not
700                          * make sense.  --list is Ok.
701                          *
702                          * Also --all and --remotes do not make sense either.
703                          */
704                         die("--reflog is incompatible with --all, --remotes, "
705                             "--independent or --merge-base");
706         }
707
708         /* If nothing is specified, show all branches by default */
709         if (ac <= topics && all_heads + all_remotes == 0)
710                 all_heads = 1;
711
712         if (reflog) {
713                 struct object_id oid;
714                 char *ref;
715                 int base = 0;
716                 unsigned int flags = 0;
717
718                 if (ac == 0) {
719                         static const char *fake_av[2];
720
721                         fake_av[0] = resolve_refdup("HEAD",
722                                                     RESOLVE_REF_READING,
723                                                     oid.hash, NULL);
724                         fake_av[1] = NULL;
725                         av = fake_av;
726                         ac = 1;
727                         if (!*av)
728                                 die("no branches given, and HEAD is not valid");
729                 }
730                 if (ac != 1)
731                         die("--reflog option needs one branch name");
732
733                 if (MAX_REVS < reflog)
734                         die("Only %d entries can be shown at one time.",
735                             MAX_REVS);
736                 if (!dwim_ref(*av, strlen(*av), oid.hash, &ref))
737                         die("No such ref %s", *av);
738
739                 /* Has the base been specified? */
740                 if (reflog_base) {
741                         char *ep;
742                         base = strtoul(reflog_base, &ep, 10);
743                         if (*ep) {
744                                 /* Ah, that is a date spec... */
745                                 unsigned long at;
746                                 at = approxidate(reflog_base);
747                                 read_ref_at(ref, flags, at, -1, oid.hash, NULL,
748                                             NULL, NULL, &base);
749                         }
750                 }
751
752                 for (i = 0; i < reflog; i++) {
753                         char *logmsg;
754                         char *nth_desc;
755                         const char *msg;
756                         unsigned long timestamp;
757                         int tz;
758
759                         if (read_ref_at(ref, flags, 0, base+i, oid.hash, &logmsg,
760                                         &timestamp, &tz, NULL)) {
761                                 reflog = i;
762                                 break;
763                         }
764                         msg = strchr(logmsg, '\t');
765                         if (!msg)
766                                 msg = "(none)";
767                         else
768                                 msg++;
769                         reflog_msg[i] = xstrfmt("(%s) %s",
770                                                 show_date(timestamp, tz,
771                                                           DATE_MODE(RELATIVE)),
772                                                 msg);
773                         free(logmsg);
774
775                         nth_desc = xstrfmt("%s@{%d}", *av, base+i);
776                         append_ref(nth_desc, &oid, 1);
777                         free(nth_desc);
778                 }
779                 free(ref);
780         }
781         else {
782                 while (0 < ac) {
783                         append_one_rev(*av);
784                         ac--; av++;
785                 }
786                 if (all_heads + all_remotes)
787                         snarf_refs(all_heads, all_remotes);
788         }
789
790         head_p = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
791                                     head_oid.hash, NULL);
792         if (head_p) {
793                 head_len = strlen(head_p);
794                 memcpy(head, head_p, head_len + 1);
795         }
796         else {
797                 head_len = 0;
798                 head[0] = 0;
799         }
800
801         if (with_current_branch && head_p) {
802                 int has_head = 0;
803                 for (i = 0; !has_head && i < ref_name_cnt; i++) {
804                         /* We are only interested in adding the branch
805                          * HEAD points at.
806                          */
807                         if (rev_is_head(head,
808                                         head_len,
809                                         ref_name[i],
810                                         head_oid.hash, NULL))
811                                 has_head++;
812                 }
813                 if (!has_head) {
814                         int offset = starts_with(head, "refs/heads/") ? 11 : 0;
815                         append_one_rev(head + offset);
816                 }
817         }
818
819         if (!ref_name_cnt) {
820                 fprintf(stderr, "No revs to be shown.\n");
821                 exit(0);
822         }
823
824         for (num_rev = 0; ref_name[num_rev]; num_rev++) {
825                 struct object_id revkey;
826                 unsigned int flag = 1u << (num_rev + REV_SHIFT);
827
828                 if (MAX_REVS <= num_rev)
829                         die("cannot handle more than %d revs.", MAX_REVS);
830                 if (get_sha1(ref_name[num_rev], revkey.hash))
831                         die("'%s' is not a valid ref.", ref_name[num_rev]);
832                 commit = lookup_commit_reference(revkey.hash);
833                 if (!commit)
834                         die("cannot find commit %s (%s)",
835                             ref_name[num_rev], oid_to_hex(&revkey));
836                 parse_commit(commit);
837                 mark_seen(commit, &seen);
838
839                 /* rev#0 uses bit REV_SHIFT, rev#1 uses bit REV_SHIFT+1,
840                  * and so on.  REV_SHIFT bits from bit 0 are used for
841                  * internal bookkeeping.
842                  */
843                 commit->object.flags |= flag;
844                 if (commit->object.flags == flag)
845                         commit_list_insert_by_date(commit, &list);
846                 rev[num_rev] = commit;
847         }
848         for (i = 0; i < num_rev; i++)
849                 rev_mask[i] = rev[i]->object.flags;
850
851         if (0 <= extra)
852                 join_revs(&list, &seen, num_rev, extra);
853
854         commit_list_sort_by_date(&seen);
855
856         if (merge_base)
857                 return show_merge_base(seen, num_rev);
858
859         if (independent)
860                 return show_independent(rev, num_rev, ref_name, rev_mask);
861
862         /* Show list; --more=-1 means list-only */
863         if (1 < num_rev || extra < 0) {
864                 for (i = 0; i < num_rev; i++) {
865                         int j;
866                         int is_head = rev_is_head(head,
867                                                   head_len,
868                                                   ref_name[i],
869                                                   head_oid.hash,
870                                                   rev[i]->object.oid.hash);
871                         if (extra < 0)
872                                 printf("%c [%s] ",
873                                        is_head ? '*' : ' ', ref_name[i]);
874                         else {
875                                 for (j = 0; j < i; j++)
876                                         putchar(' ');
877                                 printf("%s%c%s [%s] ",
878                                        get_color_code(i),
879                                        is_head ? '*' : '!',
880                                        get_color_reset_code(), ref_name[i]);
881                         }
882
883                         if (!reflog) {
884                                 /* header lines never need name */
885                                 show_one_commit(rev[i], 1);
886                         }
887                         else
888                                 puts(reflog_msg[i]);
889
890                         if (is_head)
891                                 head_at = i;
892                 }
893                 if (0 <= extra) {
894                         for (i = 0; i < num_rev; i++)
895                                 putchar('-');
896                         putchar('\n');
897                 }
898         }
899         if (extra < 0)
900                 exit(0);
901
902         /* Sort topologically */
903         sort_in_topological_order(&seen, sort_order);
904
905         /* Give names to commits */
906         if (!sha1_name && !no_name)
907                 name_commits(seen, rev, ref_name, num_rev);
908
909         all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
910         all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
911
912         while (seen) {
913                 struct commit *commit = pop_commit(&seen);
914                 int this_flag = commit->object.flags;
915                 int is_merge_point = ((this_flag & all_revs) == all_revs);
916
917                 shown_merge_point |= is_merge_point;
918
919                 if (1 < num_rev) {
920                         int is_merge = !!(commit->parents &&
921                                           commit->parents->next);
922                         if (topics &&
923                             !is_merge_point &&
924                             (this_flag & (1u << REV_SHIFT)))
925                                 continue;
926                         if (dense && is_merge &&
927                             omit_in_dense(commit, rev, num_rev))
928                                 continue;
929                         for (i = 0; i < num_rev; i++) {
930                                 int mark;
931                                 if (!(this_flag & (1u << (i + REV_SHIFT))))
932                                         mark = ' ';
933                                 else if (is_merge)
934                                         mark = '-';
935                                 else if (i == head_at)
936                                         mark = '*';
937                                 else
938                                         mark = '+';
939                                 printf("%s%c%s",
940                                        get_color_code(i),
941                                        mark, get_color_reset_code());
942                         }
943                         putchar(' ');
944                 }
945                 show_one_commit(commit, no_name);
946
947                 if (shown_merge_point && --extra < 0)
948                         break;
949         }
950         return 0;
951 }