builtin / show-branch.con commit wt-status.h: drop stdio.h include (7a06fb0)
   1#include "cache.h"
   2#include "config.h"
   3#include "pretty.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#include "commit-slab.h"
  11
  12static const char* show_branch_usage[] = {
  13    N_("git show-branch [-a | --all] [-r | --remotes] [--topo-order | --date-order]\n"
  14       "                [--current] [--color[=<when>] | --no-color] [--sparse]\n"
  15       "                [--more=<n> | --list | --independent | --merge-base]\n"
  16       "                [--no-name | --sha1-name] [--topics] [(<rev> | <glob>)...]"),
  17    N_("git show-branch (-g | --reflog)[=<n>[,<base>]] [--list] [<ref>]"),
  18    NULL
  19};
  20
  21static int showbranch_use_color = -1;
  22
  23static struct argv_array default_args = ARGV_ARRAY_INIT;
  24
  25/*
  26 * TODO: convert this use of commit->object.flags to commit-slab
  27 * instead to store a pointer to ref name directly. Then use the same
  28 * UNINTERESTING definition from revision.h here.
  29 */
  30#define UNINTERESTING   01
  31
  32#define REV_SHIFT        2
  33#define MAX_REVS        (FLAG_BITS - REV_SHIFT) /* should not exceed bits_per_int - REV_SHIFT */
  34
  35#define DEFAULT_REFLOG  4
  36
  37static const char *get_color_code(int idx)
  38{
  39        if (want_color(showbranch_use_color))
  40                return column_colors_ansi[idx % column_colors_ansi_max];
  41        return "";
  42}
  43
  44static const char *get_color_reset_code(void)
  45{
  46        if (want_color(showbranch_use_color))
  47                return GIT_COLOR_RESET;
  48        return "";
  49}
  50
  51static struct commit *interesting(struct commit_list *list)
  52{
  53        while (list) {
  54                struct commit *commit = list->item;
  55                list = list->next;
  56                if (commit->object.flags & UNINTERESTING)
  57                        continue;
  58                return commit;
  59        }
  60        return NULL;
  61}
  62
  63struct commit_name {
  64        const char *head_name; /* which head's ancestor? */
  65        int generation; /* how many parents away from head_name */
  66};
  67
  68define_commit_slab(commit_name_slab, struct commit_name *);
  69static struct commit_name_slab name_slab;
  70
  71static struct commit_name *commit_to_name(struct commit *commit)
  72{
  73        return *commit_name_slab_at(&name_slab, commit);
  74}
  75
  76
  77/* Name the commit as nth generation ancestor of head_name;
  78 * we count only the first-parent relationship for naming purposes.
  79 */
  80static void name_commit(struct commit *commit, const char *head_name, int nth)
  81{
  82        struct commit_name *name;
  83
  84        name = *commit_name_slab_at(&name_slab, commit);
  85        if (!name) {
  86                name = xmalloc(sizeof(*name));
  87                *commit_name_slab_at(&name_slab, commit) = name;
  88        }
  89        name->head_name = head_name;
  90        name->generation = nth;
  91}
  92
  93/* Parent is the first parent of the commit.  We may name it
  94 * as (n+1)th generation ancestor of the same head_name as
  95 * commit is nth generation ancestor of, if that generation
  96 * number is better than the name it already has.
  97 */
  98static void name_parent(struct commit *commit, struct commit *parent)
  99{
 100        struct commit_name *commit_name = commit_to_name(commit);
 101        struct commit_name *parent_name = commit_to_name(parent);
 102        if (!commit_name)
 103                return;
 104        if (!parent_name ||
 105            commit_name->generation + 1 < parent_name->generation)
 106                name_commit(parent, commit_name->head_name,
 107                            commit_name->generation + 1);
 108}
 109
 110static int name_first_parent_chain(struct commit *c)
 111{
 112        int i = 0;
 113        while (c) {
 114                struct commit *p;
 115                if (!commit_to_name(c))
 116                        break;
 117                if (!c->parents)
 118                        break;
 119                p = c->parents->item;
 120                if (!commit_to_name(p)) {
 121                        name_parent(c, p);
 122                        i++;
 123                }
 124                else
 125                        break;
 126                c = p;
 127        }
 128        return i;
 129}
 130
 131static void name_commits(struct commit_list *list,
 132                         struct commit **rev,
 133                         char **ref_name,
 134                         int num_rev)
 135{
 136        struct commit_list *cl;
 137        struct commit *c;
 138        int i;
 139
 140        /* First give names to the given heads */
 141        for (cl = list; cl; cl = cl->next) {
 142                c = cl->item;
 143                if (commit_to_name(c))
 144                        continue;
 145                for (i = 0; i < num_rev; i++) {
 146                        if (rev[i] == c) {
 147                                name_commit(c, ref_name[i], 0);
 148                                break;
 149                        }
 150                }
 151        }
 152
 153        /* Then commits on the first parent ancestry chain */
 154        do {
 155                i = 0;
 156                for (cl = list; cl; cl = cl->next) {
 157                        i += name_first_parent_chain(cl->item);
 158                }
 159        } while (i);
 160
 161        /* Finally, any unnamed commits */
 162        do {
 163                i = 0;
 164                for (cl = list; cl; cl = cl->next) {
 165                        struct commit_list *parents;
 166                        struct commit_name *n;
 167                        int nth;
 168                        c = cl->item;
 169                        if (!commit_to_name(c))
 170                                continue;
 171                        n = commit_to_name(c);
 172                        parents = c->parents;
 173                        nth = 0;
 174                        while (parents) {
 175                                struct commit *p = parents->item;
 176                                struct strbuf newname = STRBUF_INIT;
 177                                parents = parents->next;
 178                                nth++;
 179                                if (commit_to_name(p))
 180                                        continue;
 181                                switch (n->generation) {
 182                                case 0:
 183                                        strbuf_addstr(&newname, n->head_name);
 184                                        break;
 185                                case 1:
 186                                        strbuf_addf(&newname, "%s^", n->head_name);
 187                                        break;
 188                                default:
 189                                        strbuf_addf(&newname, "%s~%d",
 190                                                    n->head_name, n->generation);
 191                                        break;
 192                                }
 193                                if (nth == 1)
 194                                        strbuf_addch(&newname, '^');
 195                                else
 196                                        strbuf_addf(&newname, "^%d", nth);
 197                                name_commit(p, strbuf_detach(&newname, NULL), 0);
 198                                i++;
 199                                name_first_parent_chain(p);
 200                        }
 201                }
 202        } while (i);
 203}
 204
 205static int mark_seen(struct commit *commit, struct commit_list **seen_p)
 206{
 207        if (!commit->object.flags) {
 208                commit_list_insert(commit, seen_p);
 209                return 1;
 210        }
 211        return 0;
 212}
 213
 214static void join_revs(struct commit_list **list_p,
 215                      struct commit_list **seen_p,
 216                      int num_rev, int extra)
 217{
 218        int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 219        int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 220
 221        while (*list_p) {
 222                struct commit_list *parents;
 223                int still_interesting = !!interesting(*list_p);
 224                struct commit *commit = pop_commit(list_p);
 225                int flags = commit->object.flags & all_mask;
 226
 227                if (!still_interesting && extra <= 0)
 228                        break;
 229
 230                mark_seen(commit, seen_p);
 231                if ((flags & all_revs) == all_revs)
 232                        flags |= UNINTERESTING;
 233                parents = commit->parents;
 234
 235                while (parents) {
 236                        struct commit *p = parents->item;
 237                        int this_flag = p->object.flags;
 238                        parents = parents->next;
 239                        if ((this_flag & flags) == flags)
 240                                continue;
 241                        parse_commit(p);
 242                        if (mark_seen(p, seen_p) && !still_interesting)
 243                                extra--;
 244                        p->object.flags |= flags;
 245                        commit_list_insert_by_date(p, list_p);
 246                }
 247        }
 248
 249        /*
 250         * Postprocess to complete well-poisoning.
 251         *
 252         * At this point we have all the commits we have seen in
 253         * seen_p list.  Mark anything that can be reached from
 254         * uninteresting commits not interesting.
 255         */
 256        for (;;) {
 257                int changed = 0;
 258                struct commit_list *s;
 259                for (s = *seen_p; s; s = s->next) {
 260                        struct commit *c = s->item;
 261                        struct commit_list *parents;
 262
 263                        if (((c->object.flags & all_revs) != all_revs) &&
 264                            !(c->object.flags & UNINTERESTING))
 265                                continue;
 266
 267                        /* The current commit is either a merge base or
 268                         * already uninteresting one.  Mark its parents
 269                         * as uninteresting commits _only_ if they are
 270                         * already parsed.  No reason to find new ones
 271                         * here.
 272                         */
 273                        parents = c->parents;
 274                        while (parents) {
 275                                struct commit *p = parents->item;
 276                                parents = parents->next;
 277                                if (!(p->object.flags & UNINTERESTING)) {
 278                                        p->object.flags |= UNINTERESTING;
 279                                        changed = 1;
 280                                }
 281                        }
 282                }
 283                if (!changed)
 284                        break;
 285        }
 286}
 287
 288static void show_one_commit(struct commit *commit, int no_name)
 289{
 290        struct strbuf pretty = STRBUF_INIT;
 291        const char *pretty_str = "(unavailable)";
 292        struct commit_name *name = commit_to_name(commit);
 293
 294        if (commit->object.parsed) {
 295                pp_commit_easy(CMIT_FMT_ONELINE, commit, &pretty);
 296                pretty_str = pretty.buf;
 297        }
 298        skip_prefix(pretty_str, "[PATCH] ", &pretty_str);
 299
 300        if (!no_name) {
 301                if (name && name->head_name) {
 302                        printf("[%s", name->head_name);
 303                        if (name->generation) {
 304                                if (name->generation == 1)
 305                                        printf("^");
 306                                else
 307                                        printf("~%d", name->generation);
 308                        }
 309                        printf("] ");
 310                }
 311                else
 312                        printf("[%s] ",
 313                               find_unique_abbrev(&commit->object.oid,
 314                                                  DEFAULT_ABBREV));
 315        }
 316        puts(pretty_str);
 317        strbuf_release(&pretty);
 318}
 319
 320static char *ref_name[MAX_REVS + 1];
 321static int ref_name_cnt;
 322
 323static const char *find_digit_prefix(const char *s, int *v)
 324{
 325        const char *p;
 326        int ver;
 327        char ch;
 328
 329        for (p = s, ver = 0;
 330             '0' <= (ch = *p) && ch <= '9';
 331             p++)
 332                ver = ver * 10 + ch - '0';
 333        *v = ver;
 334        return p;
 335}
 336
 337
 338static int version_cmp(const char *a, const char *b)
 339{
 340        while (1) {
 341                int va, vb;
 342
 343                a = find_digit_prefix(a, &va);
 344                b = find_digit_prefix(b, &vb);
 345                if (va != vb)
 346                        return va - vb;
 347
 348                while (1) {
 349                        int ca = *a;
 350                        int cb = *b;
 351                        if ('0' <= ca && ca <= '9')
 352                                ca = 0;
 353                        if ('0' <= cb && cb <= '9')
 354                                cb = 0;
 355                        if (ca != cb)
 356                                return ca - cb;
 357                        if (!ca)
 358                                break;
 359                        a++;
 360                        b++;
 361                }
 362                if (!*a && !*b)
 363                        return 0;
 364        }
 365}
 366
 367static int compare_ref_name(const void *a_, const void *b_)
 368{
 369        const char * const*a = a_, * const*b = b_;
 370        return version_cmp(*a, *b);
 371}
 372
 373static void sort_ref_range(int bottom, int top)
 374{
 375        QSORT(ref_name + bottom, top - bottom, compare_ref_name);
 376}
 377
 378static int append_ref(const char *refname, const struct object_id *oid,
 379                      int allow_dups)
 380{
 381        struct commit *commit = lookup_commit_reference_gently(the_repository,
 382                                                               oid, 1);
 383        int i;
 384
 385        if (!commit)
 386                return 0;
 387
 388        if (!allow_dups) {
 389                /* Avoid adding the same thing twice */
 390                for (i = 0; i < ref_name_cnt; i++)
 391                        if (!strcmp(refname, ref_name[i]))
 392                                return 0;
 393        }
 394        if (MAX_REVS <= ref_name_cnt) {
 395                warning(Q_("ignoring %s; cannot handle more than %d ref",
 396                           "ignoring %s; cannot handle more than %d refs",
 397                           MAX_REVS), refname, MAX_REVS);
 398                return 0;
 399        }
 400        ref_name[ref_name_cnt++] = xstrdup(refname);
 401        ref_name[ref_name_cnt] = NULL;
 402        return 0;
 403}
 404
 405static int append_head_ref(const char *refname, const struct object_id *oid,
 406                           int flag, void *cb_data)
 407{
 408        struct object_id tmp;
 409        int ofs = 11;
 410        if (!starts_with(refname, "refs/heads/"))
 411                return 0;
 412        /* If both heads/foo and tags/foo exists, get_sha1 would
 413         * get confused.
 414         */
 415        if (get_oid(refname + ofs, &tmp) || !oideq(&tmp, oid))
 416                ofs = 5;
 417        return append_ref(refname + ofs, oid, 0);
 418}
 419
 420static int append_remote_ref(const char *refname, const struct object_id *oid,
 421                             int flag, void *cb_data)
 422{
 423        struct object_id tmp;
 424        int ofs = 13;
 425        if (!starts_with(refname, "refs/remotes/"))
 426                return 0;
 427        /* If both heads/foo and tags/foo exists, get_sha1 would
 428         * get confused.
 429         */
 430        if (get_oid(refname + ofs, &tmp) || !oideq(&tmp, oid))
 431                ofs = 5;
 432        return append_ref(refname + ofs, oid, 0);
 433}
 434
 435static int append_tag_ref(const char *refname, const struct object_id *oid,
 436                          int flag, void *cb_data)
 437{
 438        if (!starts_with(refname, "refs/tags/"))
 439                return 0;
 440        return append_ref(refname + 5, oid, 0);
 441}
 442
 443static const char *match_ref_pattern = NULL;
 444static int match_ref_slash = 0;
 445
 446static int append_matching_ref(const char *refname, const struct object_id *oid,
 447                               int flag, void *cb_data)
 448{
 449        /* we want to allow pattern hold/<asterisk> to show all
 450         * branches under refs/heads/hold/, and v0.99.9? to show
 451         * refs/tags/v0.99.9a and friends.
 452         */
 453        const char *tail;
 454        int slash = count_slashes(refname);
 455        for (tail = refname; *tail && match_ref_slash < slash; )
 456                if (*tail++ == '/')
 457                        slash--;
 458        if (!*tail)
 459                return 0;
 460        if (wildmatch(match_ref_pattern, tail, 0))
 461                return 0;
 462        if (starts_with(refname, "refs/heads/"))
 463                return append_head_ref(refname, oid, flag, cb_data);
 464        if (starts_with(refname, "refs/tags/"))
 465                return append_tag_ref(refname, oid, flag, cb_data);
 466        return append_ref(refname, oid, 0);
 467}
 468
 469static void snarf_refs(int head, int remotes)
 470{
 471        if (head) {
 472                int orig_cnt = ref_name_cnt;
 473
 474                for_each_ref(append_head_ref, NULL);
 475                sort_ref_range(orig_cnt, ref_name_cnt);
 476        }
 477        if (remotes) {
 478                int orig_cnt = ref_name_cnt;
 479
 480                for_each_ref(append_remote_ref, NULL);
 481                sort_ref_range(orig_cnt, ref_name_cnt);
 482        }
 483}
 484
 485static int rev_is_head(const char *head, const char *name,
 486                       unsigned char *head_sha1, unsigned char *sha1)
 487{
 488        if (!head || (head_sha1 && sha1 && !hasheq(head_sha1, sha1)))
 489                return 0;
 490        skip_prefix(head, "refs/heads/", &head);
 491        if (!skip_prefix(name, "refs/heads/", &name))
 492                skip_prefix(name, "heads/", &name);
 493        return !strcmp(head, name);
 494}
 495
 496static int show_merge_base(struct commit_list *seen, int num_rev)
 497{
 498        int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 499        int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 500        int exit_status = 1;
 501
 502        while (seen) {
 503                struct commit *commit = pop_commit(&seen);
 504                int flags = commit->object.flags & all_mask;
 505                if (!(flags & UNINTERESTING) &&
 506                    ((flags & all_revs) == all_revs)) {
 507                        puts(oid_to_hex(&commit->object.oid));
 508                        exit_status = 0;
 509                        commit->object.flags |= UNINTERESTING;
 510                }
 511        }
 512        return exit_status;
 513}
 514
 515static int show_independent(struct commit **rev,
 516                            int num_rev,
 517                            char **ref_name,
 518                            unsigned int *rev_mask)
 519{
 520        int i;
 521
 522        for (i = 0; i < num_rev; i++) {
 523                struct commit *commit = rev[i];
 524                unsigned int flag = rev_mask[i];
 525
 526                if (commit->object.flags == flag)
 527                        puts(oid_to_hex(&commit->object.oid));
 528                commit->object.flags |= UNINTERESTING;
 529        }
 530        return 0;
 531}
 532
 533static void append_one_rev(const char *av)
 534{
 535        struct object_id revkey;
 536        if (!get_oid(av, &revkey)) {
 537                append_ref(av, &revkey, 0);
 538                return;
 539        }
 540        if (strchr(av, '*') || strchr(av, '?') || strchr(av, '[')) {
 541                /* glob style match */
 542                int saved_matches = ref_name_cnt;
 543
 544                match_ref_pattern = av;
 545                match_ref_slash = count_slashes(av);
 546                for_each_ref(append_matching_ref, NULL);
 547                if (saved_matches == ref_name_cnt &&
 548                    ref_name_cnt < MAX_REVS)
 549                        error(_("no matching refs with %s"), av);
 550                sort_ref_range(saved_matches, ref_name_cnt);
 551                return;
 552        }
 553        die("bad sha1 reference %s", av);
 554}
 555
 556static int git_show_branch_config(const char *var, const char *value, void *cb)
 557{
 558        if (!strcmp(var, "showbranch.default")) {
 559                if (!value)
 560                        return config_error_nonbool(var);
 561                /*
 562                 * default_arg is now passed to parse_options(), so we need to
 563                 * mimic the real argv a bit better.
 564                 */
 565                if (!default_args.argc)
 566                        argv_array_push(&default_args, "show-branch");
 567                argv_array_push(&default_args, value);
 568                return 0;
 569        }
 570
 571        if (!strcmp(var, "color.showbranch")) {
 572                showbranch_use_color = git_config_colorbool(var, value);
 573                return 0;
 574        }
 575
 576        return git_color_default_config(var, value, cb);
 577}
 578
 579static int omit_in_dense(struct commit *commit, struct commit **rev, int n)
 580{
 581        /* If the commit is tip of the named branches, do not
 582         * omit it.
 583         * Otherwise, if it is a merge that is reachable from only one
 584         * tip, it is not that interesting.
 585         */
 586        int i, flag, count;
 587        for (i = 0; i < n; i++)
 588                if (rev[i] == commit)
 589                        return 0;
 590        flag = commit->object.flags;
 591        for (i = count = 0; i < n; i++) {
 592                if (flag & (1u << (i + REV_SHIFT)))
 593                        count++;
 594        }
 595        if (count == 1)
 596                return 1;
 597        return 0;
 598}
 599
 600static int reflog = 0;
 601
 602static int parse_reflog_param(const struct option *opt, const char *arg,
 603                              int unset)
 604{
 605        char *ep;
 606        const char **base = (const char **)opt->value;
 607        BUG_ON_OPT_NEG(unset);
 608        if (!arg)
 609                arg = "";
 610        reflog = strtoul(arg, &ep, 10);
 611        if (*ep == ',')
 612                *base = ep + 1;
 613        else if (*ep)
 614                return error("unrecognized reflog param '%s'", arg);
 615        else
 616                *base = NULL;
 617        if (reflog <= 0)
 618                reflog = DEFAULT_REFLOG;
 619        return 0;
 620}
 621
 622int cmd_show_branch(int ac, const char **av, const char *prefix)
 623{
 624        struct commit *rev[MAX_REVS], *commit;
 625        char *reflog_msg[MAX_REVS];
 626        struct commit_list *list = NULL, *seen = NULL;
 627        unsigned int rev_mask[MAX_REVS];
 628        int num_rev, i, extra = 0;
 629        int all_heads = 0, all_remotes = 0;
 630        int all_mask, all_revs;
 631        enum rev_sort_order sort_order = REV_SORT_IN_GRAPH_ORDER;
 632        char *head;
 633        struct object_id head_oid;
 634        int merge_base = 0;
 635        int independent = 0;
 636        int no_name = 0;
 637        int sha1_name = 0;
 638        int shown_merge_point = 0;
 639        int with_current_branch = 0;
 640        int head_at = -1;
 641        int topics = 0;
 642        int dense = 1;
 643        const char *reflog_base = NULL;
 644        struct option builtin_show_branch_options[] = {
 645                OPT_BOOL('a', "all", &all_heads,
 646                         N_("show remote-tracking and local branches")),
 647                OPT_BOOL('r', "remotes", &all_remotes,
 648                         N_("show remote-tracking branches")),
 649                OPT__COLOR(&showbranch_use_color,
 650                            N_("color '*!+-' corresponding to the branch")),
 651                { OPTION_INTEGER, 0, "more", &extra, N_("n"),
 652                            N_("show <n> more commits after the common ancestor"),
 653                            PARSE_OPT_OPTARG, NULL, (intptr_t)1 },
 654                OPT_SET_INT(0, "list", &extra, N_("synonym to more=-1"), -1),
 655                OPT_BOOL(0, "no-name", &no_name, N_("suppress naming strings")),
 656                OPT_BOOL(0, "current", &with_current_branch,
 657                         N_("include the current branch")),
 658                OPT_BOOL(0, "sha1-name", &sha1_name,
 659                         N_("name commits with their object names")),
 660                OPT_BOOL(0, "merge-base", &merge_base,
 661                         N_("show possible merge bases")),
 662                OPT_BOOL(0, "independent", &independent,
 663                            N_("show refs unreachable from any other ref")),
 664                OPT_SET_INT(0, "topo-order", &sort_order,
 665                            N_("show commits in topological order"),
 666                            REV_SORT_IN_GRAPH_ORDER),
 667                OPT_BOOL(0, "topics", &topics,
 668                         N_("show only commits not on the first branch")),
 669                OPT_SET_INT(0, "sparse", &dense,
 670                            N_("show merges reachable from only one tip"), 0),
 671                OPT_SET_INT(0, "date-order", &sort_order,
 672                            N_("topologically sort, maintaining date order "
 673                               "where possible"),
 674                            REV_SORT_BY_COMMIT_DATE),
 675                { OPTION_CALLBACK, 'g', "reflog", &reflog_base, N_("<n>[,<base>]"),
 676                            N_("show <n> most recent ref-log entries starting at "
 677                               "base"),
 678                            PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 679                            parse_reflog_param },
 680                OPT_END()
 681        };
 682
 683        init_commit_name_slab(&name_slab);
 684
 685        git_config(git_show_branch_config, NULL);
 686
 687        /* If nothing is specified, try the default first */
 688        if (ac == 1 && default_args.argc) {
 689                ac = default_args.argc;
 690                av = default_args.argv;
 691        }
 692
 693        ac = parse_options(ac, av, prefix, builtin_show_branch_options,
 694                           show_branch_usage, PARSE_OPT_STOP_AT_NON_OPTION);
 695        if (all_heads)
 696                all_remotes = 1;
 697
 698        if (extra || reflog) {
 699                /* "listing" mode is incompatible with
 700                 * independent nor merge-base modes.
 701                 */
 702                if (independent || merge_base)
 703                        usage_with_options(show_branch_usage,
 704                                           builtin_show_branch_options);
 705                if (reflog && ((0 < extra) || all_heads || all_remotes))
 706                        /*
 707                         * Asking for --more in reflog mode does not
 708                         * make sense.  --list is Ok.
 709                         *
 710                         * Also --all and --remotes do not make sense either.
 711                         */
 712                        die(_("--reflog is incompatible with --all, --remotes, "
 713                              "--independent or --merge-base"));
 714        }
 715
 716        /* If nothing is specified, show all branches by default */
 717        if (ac <= topics && all_heads + all_remotes == 0)
 718                all_heads = 1;
 719
 720        if (reflog) {
 721                struct object_id oid;
 722                char *ref;
 723                int base = 0;
 724                unsigned int flags = 0;
 725
 726                if (ac == 0) {
 727                        static const char *fake_av[2];
 728
 729                        fake_av[0] = resolve_refdup("HEAD",
 730                                                    RESOLVE_REF_READING, &oid,
 731                                                    NULL);
 732                        fake_av[1] = NULL;
 733                        av = fake_av;
 734                        ac = 1;
 735                        if (!*av)
 736                                die(_("no branches given, and HEAD is not valid"));
 737                }
 738                if (ac != 1)
 739                        die(_("--reflog option needs one branch name"));
 740
 741                if (MAX_REVS < reflog)
 742                        die(Q_("only %d entry can be shown at one time.",
 743                               "only %d entries can be shown at one time.",
 744                               MAX_REVS), MAX_REVS);
 745                if (!dwim_ref(*av, strlen(*av), &oid, &ref))
 746                        die(_("no such ref %s"), *av);
 747
 748                /* Has the base been specified? */
 749                if (reflog_base) {
 750                        char *ep;
 751                        base = strtoul(reflog_base, &ep, 10);
 752                        if (*ep) {
 753                                /* Ah, that is a date spec... */
 754                                timestamp_t at;
 755                                at = approxidate(reflog_base);
 756                                read_ref_at(get_main_ref_store(the_repository),
 757                                            ref, flags, at, -1, &oid, NULL,
 758                                            NULL, NULL, &base);
 759                        }
 760                }
 761
 762                for (i = 0; i < reflog; i++) {
 763                        char *logmsg;
 764                        char *nth_desc;
 765                        const char *msg;
 766                        timestamp_t timestamp;
 767                        int tz;
 768
 769                        if (read_ref_at(get_main_ref_store(the_repository),
 770                                        ref, flags, 0, base + i, &oid, &logmsg,
 771                                        &timestamp, &tz, NULL)) {
 772                                reflog = i;
 773                                break;
 774                        }
 775                        msg = strchr(logmsg, '\t');
 776                        if (!msg)
 777                                msg = "(none)";
 778                        else
 779                                msg++;
 780                        reflog_msg[i] = xstrfmt("(%s) %s",
 781                                                show_date(timestamp, tz,
 782                                                          DATE_MODE(RELATIVE)),
 783                                                msg);
 784                        free(logmsg);
 785
 786                        nth_desc = xstrfmt("%s@{%d}", *av, base+i);
 787                        append_ref(nth_desc, &oid, 1);
 788                        free(nth_desc);
 789                }
 790                free(ref);
 791        }
 792        else {
 793                while (0 < ac) {
 794                        append_one_rev(*av);
 795                        ac--; av++;
 796                }
 797                if (all_heads + all_remotes)
 798                        snarf_refs(all_heads, all_remotes);
 799        }
 800
 801        head = resolve_refdup("HEAD", RESOLVE_REF_READING,
 802                              &head_oid, NULL);
 803
 804        if (with_current_branch && head) {
 805                int has_head = 0;
 806                for (i = 0; !has_head && i < ref_name_cnt; i++) {
 807                        /* We are only interested in adding the branch
 808                         * HEAD points at.
 809                         */
 810                        if (rev_is_head(head,
 811                                        ref_name[i],
 812                                        head_oid.hash, NULL))
 813                                has_head++;
 814                }
 815                if (!has_head) {
 816                        const char *name = head;
 817                        skip_prefix(name, "refs/heads/", &name);
 818                        append_one_rev(name);
 819                }
 820        }
 821
 822        if (!ref_name_cnt) {
 823                fprintf(stderr, "No revs to be shown.\n");
 824                exit(0);
 825        }
 826
 827        for (num_rev = 0; ref_name[num_rev]; num_rev++) {
 828                struct object_id revkey;
 829                unsigned int flag = 1u << (num_rev + REV_SHIFT);
 830
 831                if (MAX_REVS <= num_rev)
 832                        die(Q_("cannot handle more than %d rev.",
 833                               "cannot handle more than %d revs.",
 834                               MAX_REVS), MAX_REVS);
 835                if (get_oid(ref_name[num_rev], &revkey))
 836                        die(_("'%s' is not a valid ref."), ref_name[num_rev]);
 837                commit = lookup_commit_reference(the_repository, &revkey);
 838                if (!commit)
 839                        die(_("cannot find commit %s (%s)"),
 840                            ref_name[num_rev], oid_to_hex(&revkey));
 841                parse_commit(commit);
 842                mark_seen(commit, &seen);
 843
 844                /* rev#0 uses bit REV_SHIFT, rev#1 uses bit REV_SHIFT+1,
 845                 * and so on.  REV_SHIFT bits from bit 0 are used for
 846                 * internal bookkeeping.
 847                 */
 848                commit->object.flags |= flag;
 849                if (commit->object.flags == flag)
 850                        commit_list_insert_by_date(commit, &list);
 851                rev[num_rev] = commit;
 852        }
 853        for (i = 0; i < num_rev; i++)
 854                rev_mask[i] = rev[i]->object.flags;
 855
 856        if (0 <= extra)
 857                join_revs(&list, &seen, num_rev, extra);
 858
 859        commit_list_sort_by_date(&seen);
 860
 861        if (merge_base)
 862                return show_merge_base(seen, num_rev);
 863
 864        if (independent)
 865                return show_independent(rev, num_rev, ref_name, rev_mask);
 866
 867        /* Show list; --more=-1 means list-only */
 868        if (1 < num_rev || extra < 0) {
 869                for (i = 0; i < num_rev; i++) {
 870                        int j;
 871                        int is_head = rev_is_head(head,
 872                                                  ref_name[i],
 873                                                  head_oid.hash,
 874                                                  rev[i]->object.oid.hash);
 875                        if (extra < 0)
 876                                printf("%c [%s] ",
 877                                       is_head ? '*' : ' ', ref_name[i]);
 878                        else {
 879                                for (j = 0; j < i; j++)
 880                                        putchar(' ');
 881                                printf("%s%c%s [%s] ",
 882                                       get_color_code(i),
 883                                       is_head ? '*' : '!',
 884                                       get_color_reset_code(), ref_name[i]);
 885                        }
 886
 887                        if (!reflog) {
 888                                /* header lines never need name */
 889                                show_one_commit(rev[i], 1);
 890                        }
 891                        else
 892                                puts(reflog_msg[i]);
 893
 894                        if (is_head)
 895                                head_at = i;
 896                }
 897                if (0 <= extra) {
 898                        for (i = 0; i < num_rev; i++)
 899                                putchar('-');
 900                        putchar('\n');
 901                }
 902        }
 903        if (extra < 0)
 904                exit(0);
 905
 906        /* Sort topologically */
 907        sort_in_topological_order(&seen, sort_order);
 908
 909        /* Give names to commits */
 910        if (!sha1_name && !no_name)
 911                name_commits(seen, rev, ref_name, num_rev);
 912
 913        all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 914        all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 915
 916        while (seen) {
 917                struct commit *commit = pop_commit(&seen);
 918                int this_flag = commit->object.flags;
 919                int is_merge_point = ((this_flag & all_revs) == all_revs);
 920
 921                shown_merge_point |= is_merge_point;
 922
 923                if (1 < num_rev) {
 924                        int is_merge = !!(commit->parents &&
 925                                          commit->parents->next);
 926                        if (topics &&
 927                            !is_merge_point &&
 928                            (this_flag & (1u << REV_SHIFT)))
 929                                continue;
 930                        if (dense && is_merge &&
 931                            omit_in_dense(commit, rev, num_rev))
 932                                continue;
 933                        for (i = 0; i < num_rev; i++) {
 934                                int mark;
 935                                if (!(this_flag & (1u << (i + REV_SHIFT))))
 936                                        mark = ' ';
 937                                else if (is_merge)
 938                                        mark = '-';
 939                                else if (i == head_at)
 940                                        mark = '*';
 941                                else
 942                                        mark = '+';
 943                                printf("%s%c%s",
 944                                       get_color_code(i),
 945                                       mark, get_color_reset_code());
 946                        }
 947                        putchar(' ');
 948                }
 949                show_one_commit(commit, no_name);
 950
 951                if (shown_merge_point && --extra < 0)
 952                        break;
 953        }
 954        return 0;
 955}