builtin-show-branch.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "refs.h"
   4 #include "builtin.h"
   5
   6 static const char show_branch_usage[] =
   7 "git-show-branch [--sparse] [--current] [--all] [--remotes] [--topo-order] [--more=count | --list | --independent | --merge-base ] [--topics] [<refs>...] | --reflog[=n] <branch>";
   8
   9 static int default_num;
  10 static int default_alloc;
  11 static const char **default_arg;
  12
  13 #define UNINTERESTING   01
  14
  15 #define REV_SHIFT        2
  16 #define MAX_REVS        (FLAG_BITS - REV_SHIFT) /* should not exceed bits_per_int - REV_SHIFT */
  17
  18 #define DEFAULT_REFLOG  4
  19
  20 static struct commit *interesting(struct commit_list *list)
  21 {
  22         while (list) {
  23                 struct commit *commit = list->item;
  24                 list = list->next;
  25                 if (commit->object.flags & UNINTERESTING)
  26                         continue;
  27                 return commit;
  28         }
  29         return NULL;
  30 }
  31
  32 static struct commit *pop_one_commit(struct commit_list **list_p)
  33 {
  34         struct commit *commit;
  35         struct commit_list *list;
  36         list = *list_p;
  37         commit = list->item;
  38         *list_p = list->next;
  39         free(list);
  40         return commit;
  41 }
  42
  43 struct commit_name {
  44         const char *head_name; /* which head's ancestor? */
  45         int generation; /* how many parents away from head_name */
  46 };
  47
  48 /* Name the commit as nth generation ancestor of head_name;
  49  * we count only the first-parent relationship for naming purposes.
  50  */
  51 static void name_commit(struct commit *commit, const char *head_name, int nth)
  52 {
  53         struct commit_name *name;
  54         if (!commit->util)
  55                 commit->util = xmalloc(sizeof(struct commit_name));
  56         name = commit->util;
  57         name->head_name = head_name;
  58         name->generation = nth;
  59 }
  60
  61 /* Parent is the first parent of the commit.  We may name it
  62  * as (n+1)th generation ancestor of the same head_name as
  63  * commit is nth generation ancestor of, if that generation
  64  * number is better than the name it already has.
  65  */
  66 static void name_parent(struct commit *commit, struct commit *parent)
  67 {
  68         struct commit_name *commit_name = commit->util;
  69         struct commit_name *parent_name = parent->util;
  70         if (!commit_name)
  71                 return;
  72         if (!parent_name ||
  73             commit_name->generation + 1 < parent_name->generation)
  74                 name_commit(parent, commit_name->head_name,
  75                             commit_name->generation + 1);
  76 }
  77
  78 static int name_first_parent_chain(struct commit *c)
  79 {
  80         int i = 0;
  81         while (c) {
  82                 struct commit *p;
  83                 if (!c->util)
  84                         break;
  85                 if (!c->parents)
  86                         break;
  87                 p = c->parents->item;
  88                 if (!p->util) {
  89                         name_parent(c, p);
  90                         i++;
  91                 }
  92                 else
  93                         break;
  94                 c = p;
  95         }
  96         return i;
  97 }
  98
  99 static void name_commits(struct commit_list *list,
 100                          struct commit **rev,
 101                          char **ref_name,
 102                          int num_rev)
 103 {
 104         struct commit_list *cl;
 105         struct commit *c;
 106         int i;
 107
 108         /* First give names to the given heads */
 109         for (cl = list; cl; cl = cl->next) {
 110                 c = cl->item;
 111                 if (c->util)
 112                         continue;
 113                 for (i = 0; i < num_rev; i++) {
 114                         if (rev[i] == c) {
 115                                 name_commit(c, ref_name[i], 0);
 116                                 break;
 117                         }
 118                 }
 119         }
 120
 121         /* Then commits on the first parent ancestry chain */
 122         do {
 123                 i = 0;
 124                 for (cl = list; cl; cl = cl->next) {
 125                         i += name_first_parent_chain(cl->item);
 126                 }
 127         } while (i);
 128
 129         /* Finally, any unnamed commits */
 130         do {
 131                 i = 0;
 132                 for (cl = list; cl; cl = cl->next) {
 133                         struct commit_list *parents;
 134                         struct commit_name *n;
 135                         int nth;
 136                         c = cl->item;
 137                         if (!c->util)
 138                                 continue;
 139                         n = c->util;
 140                         parents = c->parents;
 141                         nth = 0;
 142                         while (parents) {
 143                                 struct commit *p = parents->item;
 144                                 char newname[1000], *en;
 145                                 parents = parents->next;
 146                                 nth++;
 147                                 if (p->util)
 148                                         continue;
 149                                 en = newname;
 150                                 switch (n->generation) {
 151                                 case 0:
 152                                         en += sprintf(en, "%s", n->head_name);
 153                                         break;
 154                                 case 1:
 155                                         en += sprintf(en, "%s^", n->head_name);
 156                                         break;
 157                                 default:
 158                                         en += sprintf(en, "%s~%d",
 159                                                 n->head_name, n->generation);
 160                                         break;
 161                                 }
 162                                 if (nth == 1)
 163                                         en += sprintf(en, "^");
 164                                 else
 165                                         en += sprintf(en, "^%d", nth);
 166                                 name_commit(p, xstrdup(newname), 0);
 167                                 i++;
 168                                 name_first_parent_chain(p);
 169                         }
 170                 }
 171         } while (i);
 172 }
 173
 174 static int mark_seen(struct commit *commit, struct commit_list **seen_p)
 175 {
 176         if (!commit->object.flags) {
 177                 commit_list_insert(commit, seen_p);
 178                 return 1;
 179         }
 180         return 0;
 181 }
 182
 183 static void join_revs(struct commit_list **list_p,
 184                       struct commit_list **seen_p,
 185                       int num_rev, int extra)
 186 {
 187         int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 188         int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 189
 190         while (*list_p) {
 191                 struct commit_list *parents;
 192                 int still_interesting = !!interesting(*list_p);
 193                 struct commit *commit = pop_one_commit(list_p);
 194                 int flags = commit->object.flags & all_mask;
 195
 196                 if (!still_interesting && extra <= 0)
 197                         break;
 198
 199                 mark_seen(commit, seen_p);
 200                 if ((flags & all_revs) == all_revs)
 201                         flags |= UNINTERESTING;
 202                 parents = commit->parents;
 203
 204                 while (parents) {
 205                         struct commit *p = parents->item;
 206                         int this_flag = p->object.flags;
 207                         parents = parents->next;
 208                         if ((this_flag & flags) == flags)
 209                                 continue;
 210                         if (!p->object.parsed)
 211                                 parse_commit(p);
 212                         if (mark_seen(p, seen_p) && !still_interesting)
 213                                 extra--;
 214                         p->object.flags |= flags;
 215                         insert_by_date(p, list_p);
 216                 }
 217         }
 218
 219         /*
 220          * Postprocess to complete well-poisoning.
 221          *
 222          * At this point we have all the commits we have seen in
 223          * seen_p list.  Mark anything that can be reached from
 224          * uninteresting commits not interesting.
 225          */
 226         for (;;) {
 227                 int changed = 0;
 228                 struct commit_list *s;
 229                 for (s = *seen_p; s; s = s->next) {
 230                         struct commit *c = s->item;
 231                         struct commit_list *parents;
 232
 233                         if (((c->object.flags & all_revs) != all_revs) &&
 234                             !(c->object.flags & UNINTERESTING))
 235                                 continue;
 236
 237                         /* The current commit is either a merge base or
 238                          * already uninteresting one.  Mark its parents
 239                          * as uninteresting commits _only_ if they are
 240                          * already parsed.  No reason to find new ones
 241                          * here.
 242                          */
 243                         parents = c->parents;
 244                         while (parents) {
 245                                 struct commit *p = parents->item;
 246                                 parents = parents->next;
 247                                 if (!(p->object.flags & UNINTERESTING)) {
 248                                         p->object.flags |= UNINTERESTING;
 249                                         changed = 1;
 250                                 }
 251                         }
 252                 }
 253                 if (!changed)
 254                         break;
 255         }
 256 }
 257
 258 static void show_one_commit(struct commit *commit, int no_name)
 259 {
 260         char pretty[256], *cp;
 261         struct commit_name *name = commit->util;
 262         if (commit->object.parsed)
 263                 pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 264                                     pretty, sizeof(pretty), 0, NULL, NULL, 0);
 265         else
 266                 strcpy(pretty, "(unavailable)");
 267         if (!strncmp(pretty, "[PATCH] ", 8))
 268                 cp = pretty + 8;
 269         else
 270                 cp = pretty;
 271
 272         if (!no_name) {
 273                 if (name && name->head_name) {
 274                         printf("[%s", name->head_name);
 275                         if (name->generation) {
 276                                 if (name->generation == 1)
 277                                         printf("^");
 278                                 else
 279                                         printf("~%d", name->generation);
 280                         }
 281                         printf("] ");
 282                 }
 283                 else
 284                         printf("[%s] ",
 285                                find_unique_abbrev(commit->object.sha1, 7));
 286         }
 287         puts(cp);
 288 }
 289
 290 static char *ref_name[MAX_REVS + 1];
 291 static int ref_name_cnt;
 292
 293 static const char *find_digit_prefix(const char *s, int *v)
 294 {
 295         const char *p;
 296         int ver;
 297         char ch;
 298
 299         for (p = s, ver = 0;
 300              '0' <= (ch = *p) && ch <= '9';
 301              p++)
 302                 ver = ver * 10 + ch - '0';
 303         *v = ver;
 304         return p;
 305 }
 306
 307
 308 static int version_cmp(const char *a, const char *b)
 309 {
 310         while (1) {
 311                 int va, vb;
 312
 313                 a = find_digit_prefix(a, &va);
 314                 b = find_digit_prefix(b, &vb);
 315                 if (va != vb)
 316                         return va - vb;
 317
 318                 while (1) {
 319                         int ca = *a;
 320                         int cb = *b;
 321                         if ('0' <= ca && ca <= '9')
 322                                 ca = 0;
 323                         if ('0' <= cb && cb <= '9')
 324                                 cb = 0;
 325                         if (ca != cb)
 326                                 return ca - cb;
 327                         if (!ca)
 328                                 break;
 329                         a++;
 330                         b++;
 331                 }
 332                 if (!*a && !*b)
 333                         return 0;
 334         }
 335 }
 336
 337 static int compare_ref_name(const void *a_, const void *b_)
 338 {
 339         const char * const*a = a_, * const*b = b_;
 340         return version_cmp(*a, *b);
 341 }
 342
 343 static void sort_ref_range(int bottom, int top)
 344 {
 345         qsort(ref_name + bottom, top - bottom, sizeof(ref_name[0]),
 346               compare_ref_name);
 347 }
 348
 349 static int append_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 350 {
 351         struct commit *commit = lookup_commit_reference_gently(sha1, 1);
 352         int i;
 353
 354         if (!commit)
 355                 return 0;
 356         /* Avoid adding the same thing twice */
 357         for (i = 0; i < ref_name_cnt; i++)
 358                 if (!strcmp(refname, ref_name[i]))
 359                         return 0;
 360
 361         if (MAX_REVS <= ref_name_cnt) {
 362                 fprintf(stderr, "warning: ignoring %s; "
 363                         "cannot handle more than %d refs\n",
 364                         refname, MAX_REVS);
 365                 return 0;
 366         }
 367         ref_name[ref_name_cnt++] = xstrdup(refname);
 368         ref_name[ref_name_cnt] = NULL;
 369         return 0;
 370 }
 371
 372 static int append_head_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 373 {
 374         unsigned char tmp[20];
 375         int ofs = 11;
 376         if (strncmp(refname, "refs/heads/", ofs))
 377                 return 0;
 378         /* If both heads/foo and tags/foo exists, get_sha1 would
 379          * get confused.
 380          */
 381         if (get_sha1(refname + ofs, tmp) || hashcmp(tmp, sha1))
 382                 ofs = 5;
 383         return append_ref(refname + ofs, sha1, flag, cb_data);
 384 }
 385
 386 static int append_remote_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 387 {
 388         unsigned char tmp[20];
 389         int ofs = 13;
 390         if (strncmp(refname, "refs/remotes/", ofs))
 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) || hashcmp(tmp, sha1))
 396                 ofs = 5;
 397         return append_ref(refname + ofs, sha1, flag, cb_data);
 398 }
 399
 400 static int append_tag_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 401 {
 402         if (strncmp(refname, "refs/tags/", 10))
 403                 return 0;
 404         return append_ref(refname + 5, sha1, flag, cb_data);
 405 }
 406
 407 static const char *match_ref_pattern = NULL;
 408 static int match_ref_slash = 0;
 409 static int count_slash(const char *s)
 410 {
 411         int cnt = 0;
 412         while (*s)
 413                 if (*s++ == '/')
 414                         cnt++;
 415         return cnt;
 416 }
 417
 418 static int append_matching_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 419 {
 420         /* we want to allow pattern hold/<asterisk> to show all
 421          * branches under refs/heads/hold/, and v0.99.9? to show
 422          * refs/tags/v0.99.9a and friends.
 423          */
 424         const char *tail;
 425         int slash = count_slash(refname);
 426         for (tail = refname; *tail && match_ref_slash < slash; )
 427                 if (*tail++ == '/')
 428                         slash--;
 429         if (!*tail)
 430                 return 0;
 431         if (fnmatch(match_ref_pattern, tail, 0))
 432                 return 0;
 433         if (!strncmp("refs/heads/", refname, 11))
 434                 return append_head_ref(refname, sha1, flag, cb_data);
 435         if (!strncmp("refs/tags/", refname, 10))
 436                 return append_tag_ref(refname, sha1, flag, cb_data);
 437         return append_ref(refname, sha1, flag, cb_data);
 438 }
 439
 440 static void snarf_refs(int head, int remotes)
 441 {
 442         if (head) {
 443                 int orig_cnt = ref_name_cnt;
 444                 for_each_ref(append_head_ref, NULL);
 445                 sort_ref_range(orig_cnt, ref_name_cnt);
 446         }
 447         if (remotes) {
 448                 int orig_cnt = ref_name_cnt;
 449                 for_each_ref(append_remote_ref, NULL);
 450                 sort_ref_range(orig_cnt, ref_name_cnt);
 451         }
 452 }
 453
 454 static int rev_is_head(char *head, int headlen, char *name,
 455                        unsigned char *head_sha1, unsigned char *sha1)
 456 {
 457         if ((!head[0]) ||
 458             (head_sha1 && sha1 && hashcmp(head_sha1, sha1)))
 459                 return 0;
 460         if (!strncmp(head, "refs/heads/", 11))
 461                 head += 11;
 462         if (!strncmp(name, "refs/heads/", 11))
 463                 name += 11;
 464         else if (!strncmp(name, "heads/", 6))
 465                 name += 6;
 466         return !strcmp(head, name);
 467 }
 468
 469 static int show_merge_base(struct commit_list *seen, int num_rev)
 470 {
 471         int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 472         int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 473         int exit_status = 1;
 474
 475         while (seen) {
 476                 struct commit *commit = pop_one_commit(&seen);
 477                 int flags = commit->object.flags & all_mask;
 478                 if (!(flags & UNINTERESTING) &&
 479                     ((flags & all_revs) == all_revs)) {
 480                         puts(sha1_to_hex(commit->object.sha1));
 481                         exit_status = 0;
 482                         commit->object.flags |= UNINTERESTING;
 483                 }
 484         }
 485         return exit_status;
 486 }
 487
 488 static int show_independent(struct commit **rev,
 489                             int num_rev,
 490                             char **ref_name,
 491                             unsigned int *rev_mask)
 492 {
 493         int i;
 494
 495         for (i = 0; i < num_rev; i++) {
 496                 struct commit *commit = rev[i];
 497                 unsigned int flag = rev_mask[i];
 498
 499                 if (commit->object.flags == flag)
 500                         puts(sha1_to_hex(commit->object.sha1));
 501                 commit->object.flags |= UNINTERESTING;
 502         }
 503         return 0;
 504 }
 505
 506 static void append_one_rev(const char *av)
 507 {
 508         unsigned char revkey[20];
 509         if (!get_sha1(av, revkey)) {
 510                 append_ref(av, revkey, 0, NULL);
 511                 return;
 512         }
 513         if (strchr(av, '*') || strchr(av, '?') || strchr(av, '[')) {
 514                 /* glob style match */
 515                 int saved_matches = ref_name_cnt;
 516                 match_ref_pattern = av;
 517                 match_ref_slash = count_slash(av);
 518                 for_each_ref(append_matching_ref, NULL);
 519                 if (saved_matches == ref_name_cnt &&
 520                     ref_name_cnt < MAX_REVS)
 521                         error("no matching refs with %s", av);
 522                 if (saved_matches + 1 < ref_name_cnt)
 523                         sort_ref_range(saved_matches, ref_name_cnt);
 524                 return;
 525         }
 526         die("bad sha1 reference %s", av);
 527 }
 528
 529 static int git_show_branch_config(const char *var, const char *value)
 530 {
 531         if (!strcmp(var, "showbranch.default")) {
 532                 if (default_alloc <= default_num + 1) {
 533                         default_alloc = default_alloc * 3 / 2 + 20;
 534                         default_arg = xrealloc(default_arg, sizeof *default_arg * default_alloc);
 535                 }
 536                 default_arg[default_num++] = xstrdup(value);
 537                 default_arg[default_num] = NULL;
 538                 return 0;
 539         }
 540
 541         return git_default_config(var, value);
 542 }
 543
 544 static int omit_in_dense(struct commit *commit, struct commit **rev, int n)
 545 {
 546         /* If the commit is tip of the named branches, do not
 547          * omit it.
 548          * Otherwise, if it is a merge that is reachable from only one
 549          * tip, it is not that interesting.
 550          */
 551         int i, flag, count;
 552         for (i = 0; i < n; i++)
 553                 if (rev[i] == commit)
 554                         return 0;
 555         flag = commit->object.flags;
 556         for (i = count = 0; i < n; i++) {
 557                 if (flag & (1u << (i + REV_SHIFT)))
 558                         count++;
 559         }
 560         if (count == 1)
 561                 return 1;
 562         return 0;
 563 }
 564
 565 int cmd_show_branch(int ac, const char **av, const char *prefix)
 566 {
 567         struct commit *rev[MAX_REVS], *commit;
 568         struct commit_list *list = NULL, *seen = NULL;
 569         unsigned int rev_mask[MAX_REVS];
 570         int num_rev, i, extra = 0;
 571         int all_heads = 0, all_remotes = 0;
 572         int all_mask, all_revs;
 573         int lifo = 1;
 574         char head[128];
 575         const char *head_p;
 576         int head_len;
 577         unsigned char head_sha1[20];
 578         int merge_base = 0;
 579         int independent = 0;
 580         int no_name = 0;
 581         int sha1_name = 0;
 582         int shown_merge_point = 0;
 583         int with_current_branch = 0;
 584         int head_at = -1;
 585         int topics = 0;
 586         int dense = 1;
 587         int reflog = 0;
 588
 589         git_config(git_show_branch_config);
 590
 591         /* If nothing is specified, try the default first */
 592         if (ac == 1 && default_num) {
 593                 ac = default_num + 1;
 594                 av = default_arg - 1; /* ick; we would not address av[0] */
 595         }
 596
 597         while (1 < ac && av[1][0] == '-') {
 598                 const char *arg = av[1];
 599                 if (!strcmp(arg, "--")) {
 600                         ac--; av++;
 601                         break;
 602                 }
 603                 else if (!strcmp(arg, "--all") || !strcmp(arg, "-a"))
 604                         all_heads = all_remotes = 1;
 605                 else if (!strcmp(arg, "--remotes") || !strcmp(arg, "-r"))
 606                         all_remotes = 1;
 607                 else if (!strcmp(arg, "--more"))
 608                         extra = 1;
 609                 else if (!strcmp(arg, "--list"))
 610                         extra = -1;
 611                 else if (!strcmp(arg, "--no-name"))
 612                         no_name = 1;
 613                 else if (!strcmp(arg, "--current"))
 614                         with_current_branch = 1;
 615                 else if (!strcmp(arg, "--sha1-name"))
 616                         sha1_name = 1;
 617                 else if (!strncmp(arg, "--more=", 7))
 618                         extra = atoi(arg + 7);
 619                 else if (!strcmp(arg, "--merge-base"))
 620                         merge_base = 1;
 621                 else if (!strcmp(arg, "--independent"))
 622                         independent = 1;
 623                 else if (!strcmp(arg, "--topo-order"))
 624                         lifo = 1;
 625                 else if (!strcmp(arg, "--topics"))
 626                         topics = 1;
 627                 else if (!strcmp(arg, "--sparse"))
 628                         dense = 0;
 629                 else if (!strcmp(arg, "--date-order"))
 630                         lifo = 0;
 631                 else if (!strcmp(arg, "--reflog")) {
 632                         reflog = DEFAULT_REFLOG;
 633                 }
 634                 else if (!strncmp(arg, "--reflog=", 9)) {
 635                         char *end;
 636                         reflog = strtoul(arg + 9, &end, 10);
 637                         if (*end != '\0')
 638                                 die("unrecognized reflog count '%s'", arg + 9);
 639                 }
 640                 else
 641                         usage(show_branch_usage);
 642                 ac--; av++;
 643         }
 644         ac--; av++;
 645
 646         /* Only one of these is allowed */
 647         if (1 < independent + merge_base + (extra != 0) + (!!reflog))
 648                 usage(show_branch_usage);
 649
 650         /* If nothing is specified, show all branches by default */
 651         if (ac + all_heads + all_remotes == 0)
 652                 all_heads = 1;
 653
 654         if (all_heads + all_remotes)
 655                 snarf_refs(all_heads, all_remotes);
 656         if (reflog) {
 657                 int reflen;
 658                 if (!ac)
 659                         die("--reflog option needs one branch name");
 660                 reflen = strlen(*av);
 661                 for (i = 0; i < reflog; i++) {
 662                         char *name = xmalloc(reflen + 20);
 663                         sprintf(name, "%s@{%d}", *av, i);
 664                         append_one_rev(name);
 665                 }
 666         }
 667         else {
 668                 while (0 < ac) {
 669                         append_one_rev(*av);
 670                         ac--; av++;
 671                 }
 672         }
 673
 674         head_p = resolve_ref("HEAD", head_sha1, 1, NULL);
 675         if (head_p) {
 676                 head_len = strlen(head_p);
 677                 memcpy(head, head_p, head_len + 1);
 678         }
 679         else {
 680                 head_len = 0;
 681                 head[0] = 0;
 682         }
 683
 684         if (with_current_branch && head_p) {
 685                 int has_head = 0;
 686                 for (i = 0; !has_head && i < ref_name_cnt; i++) {
 687                         /* We are only interested in adding the branch
 688                          * HEAD points at.
 689                          */
 690                         if (rev_is_head(head,
 691                                         head_len,
 692                                         ref_name[i],
 693                                         head_sha1, NULL))
 694                                 has_head++;
 695                 }
 696                 if (!has_head) {
 697                         int pfxlen = strlen("refs/heads/");
 698                         append_one_rev(head + pfxlen);
 699                 }
 700         }
 701
 702         if (!ref_name_cnt) {
 703                 fprintf(stderr, "No revs to be shown.\n");
 704                 exit(0);
 705         }
 706
 707         for (num_rev = 0; ref_name[num_rev]; num_rev++) {
 708                 unsigned char revkey[20];
 709                 unsigned int flag = 1u << (num_rev + REV_SHIFT);
 710
 711                 if (MAX_REVS <= num_rev)
 712                         die("cannot handle more than %d revs.", MAX_REVS);
 713                 if (get_sha1(ref_name[num_rev], revkey))
 714                         die("'%s' is not a valid ref.", ref_name[num_rev]);
 715                 commit = lookup_commit_reference(revkey);
 716                 if (!commit)
 717                         die("cannot find commit %s (%s)",
 718                             ref_name[num_rev], revkey);
 719                 parse_commit(commit);
 720                 mark_seen(commit, &seen);
 721
 722                 /* rev#0 uses bit REV_SHIFT, rev#1 uses bit REV_SHIFT+1,
 723                  * and so on.  REV_SHIFT bits from bit 0 are used for
 724                  * internal bookkeeping.
 725                  */
 726                 commit->object.flags |= flag;
 727                 if (commit->object.flags == flag)
 728                         insert_by_date(commit, &list);
 729                 rev[num_rev] = commit;
 730         }
 731         for (i = 0; i < num_rev; i++)
 732                 rev_mask[i] = rev[i]->object.flags;
 733
 734         if (0 <= extra)
 735                 join_revs(&list, &seen, num_rev, extra);
 736
 737         sort_by_date(&seen);
 738
 739         if (merge_base)
 740                 return show_merge_base(seen, num_rev);
 741
 742         if (independent)
 743                 return show_independent(rev, num_rev, ref_name, rev_mask);
 744
 745         /* Show list; --more=-1 means list-only */
 746         if (1 < num_rev || extra < 0) {
 747                 for (i = 0; i < num_rev; i++) {
 748                         int j;
 749                         int is_head = rev_is_head(head,
 750                                                   head_len,
 751                                                   ref_name[i],
 752                                                   head_sha1,
 753                                                   rev[i]->object.sha1);
 754                         if (extra < 0)
 755                                 printf("%c [%s] ",
 756                                        is_head ? '*' : ' ', ref_name[i]);
 757                         else {
 758                                 for (j = 0; j < i; j++)
 759                                         putchar(' ');
 760                                 printf("%c [%s] ",
 761                                        is_head ? '*' : '!', ref_name[i]);
 762                         }
 763                         /* header lines never need name */
 764                         show_one_commit(rev[i], 1);
 765                         if (is_head)
 766                                 head_at = i;
 767                 }
 768                 if (0 <= extra) {
 769                         for (i = 0; i < num_rev; i++)
 770                                 putchar('-');
 771                         putchar('\n');
 772                 }
 773         }
 774         if (extra < 0)
 775                 exit(0);
 776
 777         /* Sort topologically */
 778         sort_in_topological_order(&seen, lifo);
 779
 780         /* Give names to commits */
 781         if (!sha1_name && !no_name)
 782                 name_commits(seen, rev, ref_name, num_rev);
 783
 784         all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 785         all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 786
 787         while (seen) {
 788                 struct commit *commit = pop_one_commit(&seen);
 789                 int this_flag = commit->object.flags;
 790                 int is_merge_point = ((this_flag & all_revs) == all_revs);
 791
 792                 shown_merge_point |= is_merge_point;
 793
 794                 if (1 < num_rev) {
 795                         int is_merge = !!(commit->parents &&
 796                                           commit->parents->next);
 797                         if (topics &&
 798                             !is_merge_point &&
 799                             (this_flag & (1u << REV_SHIFT)))
 800                                 continue;
 801                         if (dense && is_merge &&
 802                             omit_in_dense(commit, rev, num_rev))
 803                                 continue;
 804                         for (i = 0; i < num_rev; i++) {
 805                                 int mark;
 806                                 if (!(this_flag & (1u << (i + REV_SHIFT))))
 807                                         mark = ' ';
 808                                 else if (is_merge)
 809                                         mark = '-';
 810                                 else if (i == head_at)
 811                                         mark = '*';
 812                                 else
 813                                         mark = '+';
 814                                 putchar(mark);
 815                         }
 816                         putchar(' ');
 817                 }
 818                 show_one_commit(commit, no_name);
 819
 820                 if (shown_merge_point && --extra < 0)
 821                         break;
 822         }
 823         return 0;
 824 }