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