Andrew's git / gitweb.git / builtin-show-branch.c
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builtin-show-branch.con commit git.el: Prepend a slash to the file name when adding to .gitignore. (9f56a7f)
   1#include <stdlib.h>
   2#include <fnmatch.h>
   3#include "cache.h"
   4#include "commit.h"
   5#include "refs.h"
   6#include "builtin.h"
   7
   8static const char show_branch_usage[] =
   9"git-show-branch [--sparse] [--current] [--all] [--heads] [--tags] [--topo-order] [--more=count | --list | --independent | --merge-base ] [--topics] [<refs>...]";
  10
  11static int default_num = 0;
  12static int default_alloc = 0;
  13static const char **default_arg = NULL;
  14
  15#define UNINTERESTING   01
  16
  17#define REV_SHIFT        2
  18#define MAX_REVS        (FLAG_BITS - REV_SHIFT) /* should not exceed bits_per_int - REV_SHIFT */
  19
  20static 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
  32static 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
  43struct 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 */
  51static 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 */
  66static 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
  78static 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                c = p;
  93        }
  94        return i;
  95}
  96
  97static void name_commits(struct commit_list *list,
  98                         struct commit **rev,
  99                         char **ref_name,
 100                         int num_rev)
 101{
 102        struct commit_list *cl;
 103        struct commit *c;
 104        int i;
 105
 106        /* First give names to the given heads */
 107        for (cl = list; cl; cl = cl->next) {
 108                c = cl->item;
 109                if (c->util)
 110                        continue;
 111                for (i = 0; i < num_rev; i++) {
 112                        if (rev[i] == c) {
 113                                name_commit(c, ref_name[i], 0);
 114                                break;
 115                        }
 116                }
 117        }
 118
 119        /* Then commits on the first parent ancestry chain */
 120        do {
 121                i = 0;
 122                for (cl = list; cl; cl = cl->next) {
 123                        i += name_first_parent_chain(cl->item);
 124                }
 125        } while (i);
 126
 127        /* Finally, any unnamed commits */
 128        do {
 129                i = 0;
 130                for (cl = list; cl; cl = cl->next) {
 131                        struct commit_list *parents;
 132                        struct commit_name *n;
 133                        int nth;
 134                        c = cl->item;
 135                        if (!c->util)
 136                                continue;
 137                        n = c->util;
 138                        parents = c->parents;
 139                        nth = 0;
 140                        while (parents) {
 141                                struct commit *p = parents->item;
 142                                char newname[1000], *en;
 143                                parents = parents->next;
 144                                nth++;
 145                                if (p->util)
 146                                        continue;
 147                                en = newname;
 148                                switch (n->generation) {
 149                                case 0:
 150                                        en += sprintf(en, "%s", n->head_name);
 151                                        break;
 152                                case 1:
 153                                        en += sprintf(en, "%s^", n->head_name);
 154                                        break;
 155                                default:
 156                                        en += sprintf(en, "%s~%d",
 157                                                n->head_name, n->generation);
 158                                        break;
 159                                }
 160                                if (nth == 1)
 161                                        en += sprintf(en, "^");
 162                                else
 163                                        en += sprintf(en, "^%d", nth);
 164                                name_commit(p, strdup(newname), 0);
 165                                i++;
 166                                name_first_parent_chain(p);
 167                        }
 168                }
 169        } while (i);
 170}
 171
 172static int mark_seen(struct commit *commit, struct commit_list **seen_p)
 173{
 174        if (!commit->object.flags) {
 175                commit_list_insert(commit, seen_p);
 176                return 1;
 177        }
 178        return 0;
 179}
 180
 181static void join_revs(struct commit_list **list_p,
 182                      struct commit_list **seen_p,
 183                      int num_rev, int extra)
 184{
 185        int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 186        int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 187
 188        while (*list_p) {
 189                struct commit_list *parents;
 190                int still_interesting = !!interesting(*list_p);
 191                struct commit *commit = pop_one_commit(list_p);
 192                int flags = commit->object.flags & all_mask;
 193
 194                if (!still_interesting && extra <= 0)
 195                        break;
 196
 197                mark_seen(commit, seen_p);
 198                if ((flags & all_revs) == all_revs)
 199                        flags |= UNINTERESTING;
 200                parents = commit->parents;
 201
 202                while (parents) {
 203                        struct commit *p = parents->item;
 204                        int this_flag = p->object.flags;
 205                        parents = parents->next;
 206                        if ((this_flag & flags) == flags)
 207                                continue;
 208                        if (!p->object.parsed)
 209                                parse_commit(p);
 210                        if (mark_seen(p, seen_p) && !still_interesting)
 211                                extra--;
 212                        p->object.flags |= flags;
 213                        insert_by_date(p, list_p);
 214                }
 215        }
 216
 217        /*
 218         * Postprocess to complete well-poisoning.
 219         *
 220         * At this point we have all the commits we have seen in
 221         * seen_p list.  Mark anything that can be reached from
 222         * uninteresting commits not interesting.
 223         */
 224        for (;;) {
 225                int changed = 0;
 226                struct commit_list *s;
 227                for (s = *seen_p; s; s = s->next) {
 228                        struct commit *c = s->item;
 229                        struct commit_list *parents;
 230
 231                        if (((c->object.flags & all_revs) != all_revs) &&
 232                            !(c->object.flags & UNINTERESTING))
 233                                continue;
 234
 235                        /* The current commit is either a merge base or
 236                         * already uninteresting one.  Mark its parents
 237                         * as uninteresting commits _only_ if they are
 238                         * already parsed.  No reason to find new ones
 239                         * here.
 240                         */
 241                        parents = c->parents;
 242                        while (parents) {
 243                                struct commit *p = parents->item;
 244                                parents = parents->next;
 245                                if (!(p->object.flags & UNINTERESTING)) {
 246                                        p->object.flags |= UNINTERESTING;
 247                                        changed = 1;
 248                                }
 249                        }
 250                }
 251                if (!changed)
 252                        break;
 253        }
 254}
 255
 256static void show_one_commit(struct commit *commit, int no_name)
 257{
 258        char pretty[256], *cp;
 259        struct commit_name *name = commit->util;
 260        if (commit->object.parsed)
 261                pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 262                                    pretty, sizeof(pretty), 0, NULL, NULL);
 263        else
 264                strcpy(pretty, "(unavailable)");
 265        if (!strncmp(pretty, "[PATCH] ", 8))
 266                cp = pretty + 8;
 267        else
 268                cp = pretty;
 269
 270        if (!no_name) {
 271                if (name && name->head_name) {
 272                        printf("[%s", name->head_name);
 273                        if (name->generation) {
 274                                if (name->generation == 1)
 275                                        printf("^");
 276                                else
 277                                        printf("~%d", name->generation);
 278                        }
 279                        printf("] ");
 280                }
 281                else
 282                        printf("[%s] ",
 283                               find_unique_abbrev(commit->object.sha1, 7));
 284        }
 285        puts(cp);
 286}
 287
 288static char *ref_name[MAX_REVS + 1];
 289static int ref_name_cnt;
 290
 291static const char *find_digit_prefix(const char *s, int *v)
 292{
 293        const char *p;
 294        int ver;
 295        char ch;
 296
 297        for (p = s, ver = 0;
 298             '0' <= (ch = *p) && ch <= '9';
 299             p++)
 300                ver = ver * 10 + ch - '0';
 301        *v = ver;
 302        return p;
 303}
 304
 305
 306static int version_cmp(const char *a, const char *b)
 307{
 308        while (1) {
 309                int va, vb;
 310
 311                a = find_digit_prefix(a, &va);
 312                b = find_digit_prefix(b, &vb);
 313                if (va != vb)
 314                        return va - vb;
 315
 316                while (1) {
 317                        int ca = *a;
 318                        int cb = *b;
 319                        if ('0' <= ca && ca <= '9')
 320                                ca = 0;
 321                        if ('0' <= cb && cb <= '9')
 322                                cb = 0;
 323                        if (ca != cb)
 324                                return ca - cb;
 325                        if (!ca)
 326                                break;
 327                        a++;
 328                        b++;
 329                }
 330                if (!*a && !*b)
 331                        return 0;
 332        }
 333}
 334
 335static int compare_ref_name(const void *a_, const void *b_)
 336{
 337        const char * const*a = a_, * const*b = b_;
 338        return version_cmp(*a, *b);
 339}
 340
 341static void sort_ref_range(int bottom, int top)
 342{
 343        qsort(ref_name + bottom, top - bottom, sizeof(ref_name[0]),
 344              compare_ref_name);
 345}
 346
 347static int append_ref(const char *refname, const unsigned char *sha1)
 348{
 349        struct commit *commit = lookup_commit_reference_gently(sha1, 1);
 350        int i;
 351
 352        if (!commit)
 353                return 0;
 354        /* Avoid adding the same thing twice */
 355        for (i = 0; i < ref_name_cnt; i++)
 356                if (!strcmp(refname, ref_name[i]))
 357                        return 0;
 358
 359        if (MAX_REVS <= ref_name_cnt) {
 360                fprintf(stderr, "warning: ignoring %s; "
 361                        "cannot handle more than %d refs\n",
 362                        refname, MAX_REVS);
 363                return 0;
 364        }
 365        ref_name[ref_name_cnt++] = strdup(refname);
 366        ref_name[ref_name_cnt] = NULL;
 367        return 0;
 368}
 369
 370static int append_head_ref(const char *refname, const unsigned char *sha1)
 371{
 372        unsigned char tmp[20];
 373        int ofs = 11;
 374        if (strncmp(refname, "refs/heads/", ofs))
 375                return 0;
 376        /* If both heads/foo and tags/foo exists, get_sha1 would
 377         * get confused.
 378         */
 379        if (get_sha1(refname + ofs, tmp) || memcmp(tmp, sha1, 20))
 380                ofs = 5;
 381        return append_ref(refname + ofs, sha1);
 382}
 383
 384static int append_tag_ref(const char *refname, const unsigned char *sha1)
 385{
 386        if (strncmp(refname, "refs/tags/", 10))
 387                return 0;
 388        return append_ref(refname + 5, sha1);
 389}
 390
 391static const char *match_ref_pattern = NULL;
 392static int match_ref_slash = 0;
 393static int count_slash(const char *s)
 394{
 395        int cnt = 0;
 396        while (*s)
 397                if (*s++ == '/')
 398                        cnt++;
 399        return cnt;
 400}
 401
 402static int append_matching_ref(const char *refname, const unsigned char *sha1)
 403{
 404        /* we want to allow pattern hold/<asterisk> to show all
 405         * branches under refs/heads/hold/, and v0.99.9? to show
 406         * refs/tags/v0.99.9a and friends.
 407         */
 408        const char *tail;
 409        int slash = count_slash(refname);
 410        for (tail = refname; *tail && match_ref_slash < slash; )
 411                if (*tail++ == '/')
 412                        slash--;
 413        if (!*tail)
 414                return 0;
 415        if (fnmatch(match_ref_pattern, tail, 0))
 416                return 0;
 417        if (!strncmp("refs/heads/", refname, 11))
 418                return append_head_ref(refname, sha1);
 419        if (!strncmp("refs/tags/", refname, 10))
 420                return append_tag_ref(refname, sha1);
 421        return append_ref(refname, sha1);
 422}
 423
 424static void snarf_refs(int head, int tag)
 425{
 426        if (head) {
 427                int orig_cnt = ref_name_cnt;
 428                for_each_ref(append_head_ref);
 429                sort_ref_range(orig_cnt, ref_name_cnt);
 430        }
 431        if (tag) {
 432                int orig_cnt = ref_name_cnt;
 433                for_each_ref(append_tag_ref);
 434                sort_ref_range(orig_cnt, ref_name_cnt);
 435        }
 436}
 437
 438static int rev_is_head(char *head_path, int headlen, char *name,
 439                       unsigned char *head_sha1, unsigned char *sha1)
 440{
 441        int namelen;
 442        if ((!head_path[0]) ||
 443            (head_sha1 && sha1 && memcmp(head_sha1, sha1, 20)))
 444                return 0;
 445        namelen = strlen(name);
 446        if ((headlen < namelen) ||
 447            memcmp(head_path + headlen - namelen, name, namelen))
 448                return 0;
 449        if (headlen == namelen ||
 450            head_path[headlen - namelen - 1] == '/')
 451                return 1;
 452        return 0;
 453}
 454
 455static int show_merge_base(struct commit_list *seen, int num_rev)
 456{
 457        int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 458        int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 459        int exit_status = 1;
 460
 461        while (seen) {
 462                struct commit *commit = pop_one_commit(&seen);
 463                int flags = commit->object.flags & all_mask;
 464                if (!(flags & UNINTERESTING) &&
 465                    ((flags & all_revs) == all_revs)) {
 466                        puts(sha1_to_hex(commit->object.sha1));
 467                        exit_status = 0;
 468                        commit->object.flags |= UNINTERESTING;
 469                }
 470        }
 471        return exit_status;
 472}
 473
 474static int show_independent(struct commit **rev,
 475                            int num_rev,
 476                            char **ref_name,
 477                            unsigned int *rev_mask)
 478{
 479        int i;
 480
 481        for (i = 0; i < num_rev; i++) {
 482                struct commit *commit = rev[i];
 483                unsigned int flag = rev_mask[i];
 484
 485                if (commit->object.flags == flag)
 486                        puts(sha1_to_hex(commit->object.sha1));
 487                commit->object.flags |= UNINTERESTING;
 488        }
 489        return 0;
 490}
 491
 492static void append_one_rev(const char *av)
 493{
 494        unsigned char revkey[20];
 495        if (!get_sha1(av, revkey)) {
 496                append_ref(av, revkey);
 497                return;
 498        }
 499        if (strchr(av, '*') || strchr(av, '?') || strchr(av, '[')) {
 500                /* glob style match */
 501                int saved_matches = ref_name_cnt;
 502                match_ref_pattern = av;
 503                match_ref_slash = count_slash(av);
 504                for_each_ref(append_matching_ref);
 505                if (saved_matches == ref_name_cnt &&
 506                    ref_name_cnt < MAX_REVS)
 507                        error("no matching refs with %s", av);
 508                if (saved_matches + 1 < ref_name_cnt)
 509                        sort_ref_range(saved_matches, ref_name_cnt);
 510                return;
 511        }
 512        die("bad sha1 reference %s", av);
 513}
 514
 515static int git_show_branch_config(const char *var, const char *value)
 516{
 517        if (!strcmp(var, "showbranch.default")) {
 518                if (default_alloc <= default_num + 1) {
 519                        default_alloc = default_alloc * 3 / 2 + 20;
 520                        default_arg = xrealloc(default_arg, sizeof *default_arg * default_alloc);
 521                }
 522                default_arg[default_num++] = strdup(value);
 523                default_arg[default_num] = NULL;
 524                return 0;
 525        }
 526
 527        return git_default_config(var, value);
 528}
 529
 530static int omit_in_dense(struct commit *commit, struct commit **rev, int n)
 531{
 532        /* If the commit is tip of the named branches, do not
 533         * omit it.
 534         * Otherwise, if it is a merge that is reachable from only one
 535         * tip, it is not that interesting.
 536         */
 537        int i, flag, count;
 538        for (i = 0; i < n; i++)
 539                if (rev[i] == commit)
 540                        return 0;
 541        flag = commit->object.flags;
 542        for (i = count = 0; i < n; i++) {
 543                if (flag & (1u << (i + REV_SHIFT)))
 544                        count++;
 545        }
 546        if (count == 1)
 547                return 1;
 548        return 0;
 549}
 550
 551int cmd_show_branch(int ac, const char **av, char **envp)
 552{
 553        struct commit *rev[MAX_REVS], *commit;
 554        struct commit_list *list = NULL, *seen = NULL;
 555        unsigned int rev_mask[MAX_REVS];
 556        int num_rev, i, extra = 0;
 557        int all_heads = 0, all_tags = 0;
 558        int all_mask, all_revs;
 559        int lifo = 1;
 560        char head_path[128];
 561        const char *head_path_p;
 562        int head_path_len;
 563        unsigned char head_sha1[20];
 564        int merge_base = 0;
 565        int independent = 0;
 566        int no_name = 0;
 567        int sha1_name = 0;
 568        int shown_merge_point = 0;
 569        int with_current_branch = 0;
 570        int head_at = -1;
 571        int topics = 0;
 572        int dense = 1;
 573
 574        setup_git_directory();
 575        git_config(git_show_branch_config);
 576
 577        /* If nothing is specified, try the default first */
 578        if (ac == 1 && default_num) {
 579                ac = default_num + 1;
 580                av = default_arg - 1; /* ick; we would not address av[0] */
 581        }
 582
 583        while (1 < ac && av[1][0] == '-') {
 584                const char *arg = av[1];
 585                if (!strcmp(arg, "--")) {
 586                        ac--; av++;
 587                        break;
 588                }
 589                else if (!strcmp(arg, "--all"))
 590                        all_heads = all_tags = 1;
 591                else if (!strcmp(arg, "--heads"))
 592                        all_heads = 1;
 593                else if (!strcmp(arg, "--tags"))
 594                        all_tags = 1;
 595                else if (!strcmp(arg, "--more"))
 596                        extra = 1;
 597                else if (!strcmp(arg, "--list"))
 598                        extra = -1;
 599                else if (!strcmp(arg, "--no-name"))
 600                        no_name = 1;
 601                else if (!strcmp(arg, "--current"))
 602                        with_current_branch = 1;
 603                else if (!strcmp(arg, "--sha1-name"))
 604                        sha1_name = 1;
 605                else if (!strncmp(arg, "--more=", 7))
 606                        extra = atoi(arg + 7);
 607                else if (!strcmp(arg, "--merge-base"))
 608                        merge_base = 1;
 609                else if (!strcmp(arg, "--independent"))
 610                        independent = 1;
 611                else if (!strcmp(arg, "--topo-order"))
 612                        lifo = 1;
 613                else if (!strcmp(arg, "--topics"))
 614                        topics = 1;
 615                else if (!strcmp(arg, "--sparse"))
 616                        dense = 0;
 617                else if (!strcmp(arg, "--date-order"))
 618                        lifo = 0;
 619                else
 620                        usage(show_branch_usage);
 621                ac--; av++;
 622        }
 623        ac--; av++;
 624
 625        /* Only one of these is allowed */
 626        if (1 < independent + merge_base + (extra != 0))
 627                usage(show_branch_usage);
 628
 629        /* If nothing is specified, show all branches by default */
 630        if (ac + all_heads + all_tags == 0)
 631                all_heads = 1;
 632
 633        if (all_heads + all_tags)
 634                snarf_refs(all_heads, all_tags);
 635        while (0 < ac) {
 636                append_one_rev(*av);
 637                ac--; av++;
 638        }
 639
 640        head_path_p = resolve_ref(git_path("HEAD"), head_sha1, 1);
 641        if (head_path_p) {
 642                head_path_len = strlen(head_path_p);
 643                memcpy(head_path, head_path_p, head_path_len + 1);
 644        }
 645        else {
 646                head_path_len = 0;
 647                head_path[0] = 0;
 648        }
 649
 650        if (with_current_branch && head_path_p) {
 651                int has_head = 0;
 652                for (i = 0; !has_head && i < ref_name_cnt; i++) {
 653                        /* We are only interested in adding the branch
 654                         * HEAD points at.
 655                         */
 656                        if (rev_is_head(head_path,
 657                                        head_path_len,
 658                                        ref_name[i],
 659                                        head_sha1, NULL))
 660                                has_head++;
 661                }
 662                if (!has_head) {
 663                        int pfxlen = strlen(git_path("refs/heads/"));
 664                        append_one_rev(head_path + pfxlen);
 665                }
 666        }
 667
 668        if (!ref_name_cnt) {
 669                fprintf(stderr, "No revs to be shown.\n");
 670                exit(0);
 671        }
 672
 673        for (num_rev = 0; ref_name[num_rev]; num_rev++) {
 674                unsigned char revkey[20];
 675                unsigned int flag = 1u << (num_rev + REV_SHIFT);
 676
 677                if (MAX_REVS <= num_rev)
 678                        die("cannot handle more than %d revs.", MAX_REVS);
 679                if (get_sha1(ref_name[num_rev], revkey))
 680                        die("'%s' is not a valid ref.", ref_name[num_rev]);
 681                commit = lookup_commit_reference(revkey);
 682                if (!commit)
 683                        die("cannot find commit %s (%s)",
 684                            ref_name[num_rev], revkey);
 685                parse_commit(commit);
 686                mark_seen(commit, &seen);
 687
 688                /* rev#0 uses bit REV_SHIFT, rev#1 uses bit REV_SHIFT+1,
 689                 * and so on.  REV_SHIFT bits from bit 0 are used for
 690                 * internal bookkeeping.
 691                 */
 692                commit->object.flags |= flag;
 693                if (commit->object.flags == flag)
 694                        insert_by_date(commit, &list);
 695                rev[num_rev] = commit;
 696        }
 697        for (i = 0; i < num_rev; i++)
 698                rev_mask[i] = rev[i]->object.flags;
 699
 700        if (0 <= extra)
 701                join_revs(&list, &seen, num_rev, extra);
 702
 703        sort_by_date(&seen);
 704
 705        if (merge_base)
 706                return show_merge_base(seen, num_rev);
 707
 708        if (independent)
 709                return show_independent(rev, num_rev, ref_name, rev_mask);
 710
 711        /* Show list; --more=-1 means list-only */
 712        if (1 < num_rev || extra < 0) {
 713                for (i = 0; i < num_rev; i++) {
 714                        int j;
 715                        int is_head = rev_is_head(head_path,
 716                                                  head_path_len,
 717                                                  ref_name[i],
 718                                                  head_sha1,
 719                                                  rev[i]->object.sha1);
 720                        if (extra < 0)
 721                                printf("%c [%s] ",
 722                                       is_head ? '*' : ' ', ref_name[i]);
 723                        else {
 724                                for (j = 0; j < i; j++)
 725                                        putchar(' ');
 726                                printf("%c [%s] ",
 727                                       is_head ? '*' : '!', ref_name[i]);
 728                        }
 729                        /* header lines never need name */
 730                        show_one_commit(rev[i], 1);
 731                        if (is_head)
 732                                head_at = i;
 733                }
 734                if (0 <= extra) {
 735                        for (i = 0; i < num_rev; i++)
 736                                putchar('-');
 737                        putchar('\n');
 738                }
 739        }
 740        if (extra < 0)
 741                exit(0);
 742
 743        /* Sort topologically */
 744        sort_in_topological_order(&seen, lifo);
 745
 746        /* Give names to commits */
 747        if (!sha1_name && !no_name)
 748                name_commits(seen, rev, ref_name, num_rev);
 749
 750        all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 751        all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 752
 753        while (seen) {
 754                struct commit *commit = pop_one_commit(&seen);
 755                int this_flag = commit->object.flags;
 756                int is_merge_point = ((this_flag & all_revs) == all_revs);
 757
 758                shown_merge_point |= is_merge_point;
 759
 760                if (1 < num_rev) {
 761                        int is_merge = !!(commit->parents &&
 762                                          commit->parents->next);
 763                        if (topics &&
 764                            !is_merge_point &&
 765                            (this_flag & (1u << REV_SHIFT)))
 766                                continue;
 767                        if (dense && is_merge &&
 768                            omit_in_dense(commit, rev, num_rev))
 769                                continue;
 770                        for (i = 0; i < num_rev; i++) {
 771                                int mark;
 772                                if (!(this_flag & (1u << (i + REV_SHIFT))))
 773                                        mark = ' ';
 774                                else if (is_merge)
 775                                        mark = '-';
 776                                else if (i == head_at)
 777                                        mark = '*';
 778                                else
 779                                        mark = '+';
 780                                putchar(mark);
 781                        }
 782                        putchar(' ');
 783                }
 784                show_one_commit(commit, no_name);
 785
 786                if (shown_merge_point && --extra < 0)
 787                        break;
 788        }
 789        return 0;
 790}