builtin/show-branch.c

   1 #define USE_THE_REPOSITORY_VARIABLE
   2 #include "builtin.h"
   3 #include "config.h"
   4 #include "environment.h"
   5 #include "gettext.h"
   6 #include "hash.h"
   7 #include "hex.h"
   8 #include "pretty.h"
   9 #include "refs.h"
  10 #include "color.h"
  11 #include "strvec.h"
  12 #include "object-name.h"
  13 #include "parse-options.h"
  14
  15 #include "dir.h"
  16 #include "commit-slab.h"
  17 #include "date.h"
  18 #include "wildmatch.h"
  19
  20 static const char* show_branch_usage[] = {
  21     N_("git show-branch [-a | --all] [-r | --remotes] [--topo-order | --date-order]\n"
  22        "                [--current] [--color[=<when>] | --no-color] [--sparse]\n"
  23        "                [--more=<n> | --list | --independent | --merge-base]\n"
  24        "                [--no-name | --sha1-name] [--topics]\n"
  25        "                [(<rev> | <glob>)...]"),
  26     N_("git show-branch (-g | --reflog)[=<n>[,<base>]] [--list] [<ref>]"),
  27     NULL
  28 };
  29
  30 static int showbranch_use_color = -1;
  31
  32 static struct strvec default_args = STRVEC_INIT;
  33
  34 /*
  35  * TODO: convert this use of commit->object.flags to commit-slab
  36  * instead to store a pointer to ref name directly. Then use the same
  37  * UNINTERESTING definition from revision.h here.
  38  */
  39 #define UNINTERESTING   01
  40
  41 #define REV_SHIFT        2
  42 #define MAX_REVS        (FLAG_BITS - REV_SHIFT) /* should not exceed bits_per_int - REV_SHIFT */
  43
  44 #define DEFAULT_REFLOG  4
  45
  46 static const char *get_color_code(int idx)
  47 {
  48         if (want_color(showbranch_use_color))
  49                 return column_colors_ansi[idx % column_colors_ansi_max];
  50         return "";
  51 }
  52
  53 static const char *get_color_reset_code(void)
  54 {
  55         if (want_color(showbranch_use_color))
  56                 return GIT_COLOR_RESET;
  57         return "";
  58 }
  59
  60 static struct commit *interesting(struct commit_list *list)
  61 {
  62         while (list) {
  63                 struct commit *commit = list->item;
  64                 list = list->next;
  65                 if (commit->object.flags & UNINTERESTING)
  66                         continue;
  67                 return commit;
  68         }
  69         return NULL;
  70 }
  71
  72 struct commit_name {
  73         const char *head_name; /* which head's ancestor? */
  74         int generation; /* how many parents away from head_name */
  75 };
  76
  77 define_commit_slab(commit_name_slab, struct commit_name *);
  78 static struct commit_name_slab name_slab;
  79
  80 static struct commit_name *commit_to_name(struct commit *commit)
  81 {
  82         return *commit_name_slab_at(&name_slab, commit);
  83 }
  84
  85
  86 /* Name the commit as nth generation ancestor of head_name;
  87  * we count only the first-parent relationship for naming purposes.
  88  */
  89 static void name_commit(struct commit *commit, const char *head_name, int nth)
  90 {
  91         struct commit_name *name;
  92
  93         name = *commit_name_slab_at(&name_slab, commit);
  94         if (!name) {
  95                 name = xmalloc(sizeof(*name));
  96                 *commit_name_slab_at(&name_slab, commit) = name;
  97         }
  98         name->head_name = head_name;
  99         name->generation = nth;
 100 }
 101
 102 /* Parent is the first parent of the commit.  We may name it
 103  * as (n+1)th generation ancestor of the same head_name as
 104  * commit is nth generation ancestor of, if that generation
 105  * number is better than the name it already has.
 106  */
 107 static void name_parent(struct commit *commit, struct commit *parent)
 108 {
 109         struct commit_name *commit_name = commit_to_name(commit);
 110         struct commit_name *parent_name = commit_to_name(parent);
 111         if (!commit_name)
 112                 return;
 113         if (!parent_name ||
 114             commit_name->generation + 1 < parent_name->generation)
 115                 name_commit(parent, commit_name->head_name,
 116                             commit_name->generation + 1);
 117 }
 118
 119 static int name_first_parent_chain(struct commit *c)
 120 {
 121         int i = 0;
 122         while (c) {
 123                 struct commit *p;
 124                 if (!commit_to_name(c))
 125                         break;
 126                 if (!c->parents)
 127                         break;
 128                 p = c->parents->item;
 129                 if (!commit_to_name(p)) {
 130                         name_parent(c, p);
 131                         i++;
 132                 }
 133                 else
 134                         break;
 135                 c = p;
 136         }
 137         return i;
 138 }
 139
 140 static void name_commits(struct commit_list *list,
 141                          struct commit **rev,
 142                          char **ref_name,
 143                          int num_rev)
 144 {
 145         struct commit_list *cl;
 146         struct commit *c;
 147         int i;
 148
 149         /* First give names to the given heads */
 150         for (cl = list; cl; cl = cl->next) {
 151                 c = cl->item;
 152                 if (commit_to_name(c))
 153                         continue;
 154                 for (i = 0; i < num_rev; i++) {
 155                         if (rev[i] == c) {
 156                                 name_commit(c, ref_name[i], 0);
 157                                 break;
 158                         }
 159                 }
 160         }
 161
 162         /* Then commits on the first parent ancestry chain */
 163         do {
 164                 i = 0;
 165                 for (cl = list; cl; cl = cl->next) {
 166                         i += name_first_parent_chain(cl->item);
 167                 }
 168         } while (i);
 169
 170         /* Finally, any unnamed commits */
 171         do {
 172                 i = 0;
 173                 for (cl = list; cl; cl = cl->next) {
 174                         struct commit_list *parents;
 175                         struct commit_name *n;
 176                         int nth;
 177                         c = cl->item;
 178                         if (!commit_to_name(c))
 179                                 continue;
 180                         n = commit_to_name(c);
 181                         parents = c->parents;
 182                         nth = 0;
 183                         while (parents) {
 184                                 struct commit *p = parents->item;
 185                                 struct strbuf newname = STRBUF_INIT;
 186                                 parents = parents->next;
 187                                 nth++;
 188                                 if (commit_to_name(p))
 189                                         continue;
 190                                 switch (n->generation) {
 191                                 case 0:
 192                                         strbuf_addstr(&newname, n->head_name);
 193                                         break;
 194                                 case 1:
 195                                         strbuf_addf(&newname, "%s^", n->head_name);
 196                                         break;
 197                                 default:
 198                                         strbuf_addf(&newname, "%s~%d",
 199                                                     n->head_name, n->generation);
 200                                         break;
 201                                 }
 202                                 if (nth == 1)
 203                                         strbuf_addch(&newname, '^');
 204                                 else
 205                                         strbuf_addf(&newname, "^%d", nth);
 206                                 name_commit(p, strbuf_detach(&newname, NULL), 0);
 207                                 i++;
 208                                 name_first_parent_chain(p);
 209                         }
 210                 }
 211         } while (i);
 212 }
 213
 214 static int mark_seen(struct commit *commit, struct commit_list **seen_p)
 215 {
 216         if (!commit->object.flags) {
 217                 commit_list_insert(commit, seen_p);
 218                 return 1;
 219         }
 220         return 0;
 221 }
 222
 223 static void join_revs(struct commit_list **list_p,
 224                       struct commit_list **seen_p,
 225                       int num_rev, int extra)
 226 {
 227         int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 228         int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 229
 230         while (*list_p) {
 231                 struct commit_list *parents;
 232                 int still_interesting = !!interesting(*list_p);
 233                 struct commit *commit = pop_commit(list_p);
 234                 int flags = commit->object.flags & all_mask;
 235
 236                 if (!still_interesting && extra <= 0)
 237                         break;
 238
 239                 mark_seen(commit, seen_p);
 240                 if ((flags & all_revs) == all_revs)
 241                         flags |= UNINTERESTING;
 242                 parents = commit->parents;
 243
 244                 while (parents) {
 245                         struct commit *p = parents->item;
 246                         int this_flag = p->object.flags;
 247                         parents = parents->next;
 248                         if ((this_flag & flags) == flags)
 249                                 continue;
 250                         repo_parse_commit(the_repository, p);
 251                         if (mark_seen(p, seen_p) && !still_interesting)
 252                                 extra--;
 253                         p->object.flags |= flags;
 254                         commit_list_insert_by_date(p, list_p);
 255                 }
 256         }
 257
 258         /*
 259          * Postprocess to complete well-poisoning.
 260          *
 261          * At this point we have all the commits we have seen in
 262          * seen_p list.  Mark anything that can be reached from
 263          * uninteresting commits not interesting.
 264          */
 265         for (;;) {
 266                 int changed = 0;
 267                 struct commit_list *s;
 268                 for (s = *seen_p; s; s = s->next) {
 269                         struct commit *c = s->item;
 270                         struct commit_list *parents;
 271
 272                         if (((c->object.flags & all_revs) != all_revs) &&
 273                             !(c->object.flags & UNINTERESTING))
 274                                 continue;
 275
 276                         /* The current commit is either a merge base or
 277                          * already uninteresting one.  Mark its parents
 278                          * as uninteresting commits _only_ if they are
 279                          * already parsed.  No reason to find new ones
 280                          * here.
 281                          */
 282                         parents = c->parents;
 283                         while (parents) {
 284                                 struct commit *p = parents->item;
 285                                 parents = parents->next;
 286                                 if (!(p->object.flags & UNINTERESTING)) {
 287                                         p->object.flags |= UNINTERESTING;
 288                                         changed = 1;
 289                                 }
 290                         }
 291                 }
 292                 if (!changed)
 293                         break;
 294         }
 295 }
 296
 297 static void show_one_commit(struct commit *commit, int no_name)
 298 {
 299         struct strbuf pretty = STRBUF_INIT;
 300         const char *pretty_str = "(unavailable)";
 301         struct commit_name *name = commit_to_name(commit);
 302
 303         if (commit->object.parsed) {
 304                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &pretty);
 305                 pretty_str = pretty.buf;
 306         }
 307         skip_prefix(pretty_str, "[PATCH] ", &pretty_str);
 308
 309         if (!no_name) {
 310                 if (name && name->head_name) {
 311                         printf("[%s", name->head_name);
 312                         if (name->generation) {
 313                                 if (name->generation == 1)
 314                                         printf("^");
 315                                 else
 316                                         printf("~%d", name->generation);
 317                         }
 318                         printf("] ");
 319                 }
 320                 else
 321                         printf("[%s] ",
 322                                repo_find_unique_abbrev(the_repository, &commit->object.oid,
 323                                                        DEFAULT_ABBREV));
 324         }
 325         puts(pretty_str);
 326         strbuf_release(&pretty);
 327 }
 328
 329 static char *ref_name[MAX_REVS + 1];
 330 static int ref_name_cnt;
 331
 332 static const char *find_digit_prefix(const char *s, int *v)
 333 {
 334         const char *p;
 335         int ver;
 336         char ch;
 337
 338         for (p = s, ver = 0;
 339              '0' <= (ch = *p) && ch <= '9';
 340              p++)
 341                 ver = ver * 10 + ch - '0';
 342         *v = ver;
 343         return p;
 344 }
 345
 346
 347 static int version_cmp(const char *a, const char *b)
 348 {
 349         while (1) {
 350                 int va, vb;
 351
 352                 a = find_digit_prefix(a, &va);
 353                 b = find_digit_prefix(b, &vb);
 354                 if (va != vb)
 355                         return va - vb;
 356
 357                 while (1) {
 358                         int ca = *a;
 359                         int cb = *b;
 360                         if ('0' <= ca && ca <= '9')
 361                                 ca = 0;
 362                         if ('0' <= cb && cb <= '9')
 363                                 cb = 0;
 364                         if (ca != cb)
 365                                 return ca - cb;
 366                         if (!ca)
 367                                 break;
 368                         a++;
 369                         b++;
 370                 }
 371                 if (!*a && !*b)
 372                         return 0;
 373         }
 374 }
 375
 376 static int compare_ref_name(const void *a_, const void *b_)
 377 {
 378         const char * const*a = a_, * const*b = b_;
 379         return version_cmp(*a, *b);
 380 }
 381
 382 static void sort_ref_range(int bottom, int top)
 383 {
 384         QSORT(ref_name + bottom, top - bottom, compare_ref_name);
 385 }
 386
 387 static int append_ref(const char *refname, const struct object_id *oid,
 388                       int allow_dups)
 389 {
 390         struct commit *commit = lookup_commit_reference_gently(the_repository,
 391                                                                oid, 1);
 392         int i;
 393
 394         if (!commit)
 395                 return 0;
 396
 397         if (!allow_dups) {
 398                 /* Avoid adding the same thing twice */
 399                 for (i = 0; i < ref_name_cnt; i++)
 400                         if (!strcmp(refname, ref_name[i]))
 401                                 return 0;
 402         }
 403         if (MAX_REVS <= ref_name_cnt) {
 404                 warning(Q_("ignoring %s; cannot handle more than %d ref",
 405                            "ignoring %s; cannot handle more than %d refs",
 406                            MAX_REVS), refname, MAX_REVS);
 407                 return 0;
 408         }
 409         ref_name[ref_name_cnt++] = xstrdup(refname);
 410         ref_name[ref_name_cnt] = NULL;
 411         return 0;
 412 }
 413
 414 static int append_head_ref(const char *refname, const char *referent UNUSED, const struct object_id *oid,
 415                            int flag UNUSED, void *cb_data UNUSED)
 416 {
 417         struct object_id tmp;
 418         int ofs = 11;
 419         if (!starts_with(refname, "refs/heads/"))
 420                 return 0;
 421         /* If both heads/foo and tags/foo exists, get_sha1 would
 422          * get confused.
 423          */
 424         if (repo_get_oid(the_repository, refname + ofs, &tmp) || !oideq(&tmp, oid))
 425                 ofs = 5;
 426         return append_ref(refname + ofs, oid, 0);
 427 }
 428
 429 static int append_remote_ref(const char *refname, const char *referent UNUSED, const struct object_id *oid,
 430                              int flag UNUSED, void *cb_data UNUSED)
 431 {
 432         struct object_id tmp;
 433         int ofs = 13;
 434         if (!starts_with(refname, "refs/remotes/"))
 435                 return 0;
 436         /* If both heads/foo and tags/foo exists, get_sha1 would
 437          * get confused.
 438          */
 439         if (repo_get_oid(the_repository, refname + ofs, &tmp) || !oideq(&tmp, oid))
 440                 ofs = 5;
 441         return append_ref(refname + ofs, oid, 0);
 442 }
 443
 444 static int append_tag_ref(const char *refname, const struct object_id *oid,
 445                           int flag UNUSED, void *cb_data UNUSED)
 446 {
 447         if (!starts_with(refname, "refs/tags/"))
 448                 return 0;
 449         return append_ref(refname + 5, oid, 0);
 450 }
 451
 452 static const char *match_ref_pattern = NULL;
 453 static int match_ref_slash = 0;
 454
 455 static int append_matching_ref(const char *refname, const char *referent UNUSED, const struct object_id *oid,
 456                                int flag, void *cb_data)
 457 {
 458         /* we want to allow pattern hold/<asterisk> to show all
 459          * branches under refs/heads/hold/, and v0.99.9? to show
 460          * refs/tags/v0.99.9a and friends.
 461          */
 462         const char *tail;
 463         int slash = count_slashes(refname);
 464         for (tail = refname; *tail && match_ref_slash < slash; )
 465                 if (*tail++ == '/')
 466                         slash--;
 467         if (!*tail)
 468                 return 0;
 469         if (wildmatch(match_ref_pattern, tail, 0))
 470                 return 0;
 471         if (starts_with(refname, "refs/heads/"))
 472                 return append_head_ref(refname, NULL, oid, flag, cb_data);
 473         if (starts_with(refname, "refs/tags/"))
 474                 return append_tag_ref(refname, oid, flag, cb_data);
 475         return append_ref(refname, oid, 0);
 476 }
 477
 478 static void snarf_refs(int head, int remotes)
 479 {
 480         if (head) {
 481                 int orig_cnt = ref_name_cnt;
 482
 483                 refs_for_each_ref(get_main_ref_store(the_repository),
 484                                   append_head_ref, NULL);
 485                 sort_ref_range(orig_cnt, ref_name_cnt);
 486         }
 487         if (remotes) {
 488                 int orig_cnt = ref_name_cnt;
 489
 490                 refs_for_each_ref(get_main_ref_store(the_repository),
 491                                   append_remote_ref, NULL);
 492                 sort_ref_range(orig_cnt, ref_name_cnt);
 493         }
 494 }
 495
 496 static int rev_is_head(const char *head, const char *name)
 497 {
 498         if (!head)
 499                 return 0;
 500         skip_prefix(head, "refs/heads/", &head);
 501         if (!skip_prefix(name, "refs/heads/", &name))
 502                 skip_prefix(name, "heads/", &name);
 503         return !strcmp(head, name);
 504 }
 505
 506 static int show_merge_base(const struct commit_list *seen, int num_rev)
 507 {
 508         int all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 509         int all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 510         int exit_status = 1;
 511
 512         for (const struct commit_list *s = seen; s; s = s->next) {
 513                 struct commit *commit = s->item;
 514                 int flags = commit->object.flags & all_mask;
 515                 if (!(flags & UNINTERESTING) &&
 516                     ((flags & all_revs) == all_revs)) {
 517                         puts(oid_to_hex(&commit->object.oid));
 518                         exit_status = 0;
 519                         commit->object.flags |= UNINTERESTING;
 520                 }
 521         }
 522         return exit_status;
 523 }
 524
 525 static int show_independent(struct commit **rev,
 526                             int num_rev,
 527                             unsigned int *rev_mask)
 528 {
 529         int i;
 530
 531         for (i = 0; i < num_rev; i++) {
 532                 struct commit *commit = rev[i];
 533                 unsigned int flag = rev_mask[i];
 534
 535                 if (commit->object.flags == flag)
 536                         puts(oid_to_hex(&commit->object.oid));
 537                 commit->object.flags |= UNINTERESTING;
 538         }
 539         return 0;
 540 }
 541
 542 static void append_one_rev(const char *av)
 543 {
 544         struct object_id revkey;
 545         if (!repo_get_oid(the_repository, av, &revkey)) {
 546                 append_ref(av, &revkey, 0);
 547                 return;
 548         }
 549         if (strpbrk(av, "*?[")) {
 550                 /* glob style match */
 551                 int saved_matches = ref_name_cnt;
 552
 553                 match_ref_pattern = av;
 554                 match_ref_slash = count_slashes(av);
 555                 refs_for_each_ref(get_main_ref_store(the_repository),
 556                                   append_matching_ref, NULL);
 557                 if (saved_matches == ref_name_cnt &&
 558                     ref_name_cnt < MAX_REVS)
 559                         error(_("no matching refs with %s"), av);
 560                 sort_ref_range(saved_matches, ref_name_cnt);
 561                 return;
 562         }
 563         die("bad sha1 reference %s", av);
 564 }
 565
 566 static int git_show_branch_config(const char *var, const char *value,
 567                                   const struct config_context *ctx, void *cb)
 568 {
 569         if (!strcmp(var, "showbranch.default")) {
 570                 if (!value)
 571                         return config_error_nonbool(var);
 572                 /*
 573                  * default_arg is now passed to parse_options(), so we need to
 574                  * mimic the real argv a bit better.
 575                  */
 576                 if (!default_args.nr)
 577                         strvec_push(&default_args, "show-branch");
 578                 strvec_push(&default_args, value);
 579                 return 0;
 580         }
 581
 582         if (!strcmp(var, "color.showbranch")) {
 583                 showbranch_use_color = git_config_colorbool(var, value);
 584                 return 0;
 585         }
 586
 587         if (git_color_config(var, value, cb) < 0)
 588                 return -1;
 589
 590         return git_default_config(var, value, ctx, cb);
 591 }
 592
 593 static int omit_in_dense(struct commit *commit, struct commit **rev, int n)
 594 {
 595         /* If the commit is tip of the named branches, do not
 596          * omit it.
 597          * Otherwise, if it is a merge that is reachable from only one
 598          * tip, it is not that interesting.
 599          */
 600         int i, flag, count;
 601         for (i = 0; i < n; i++)
 602                 if (rev[i] == commit)
 603                         return 0;
 604         flag = commit->object.flags;
 605         for (i = count = 0; i < n; i++) {
 606                 if (flag & (1u << (i + REV_SHIFT)))
 607                         count++;
 608         }
 609         if (count == 1)
 610                 return 1;
 611         return 0;
 612 }
 613
 614 static int reflog = 0;
 615
 616 static int parse_reflog_param(const struct option *opt, const char *arg,
 617                               int unset)
 618 {
 619         char *ep;
 620         const char **base = (const char **)opt->value;
 621         BUG_ON_OPT_NEG(unset);
 622         if (!arg)
 623                 arg = "";
 624         reflog = strtoul(arg, &ep, 10);
 625         if (*ep == ',')
 626                 *base = ep + 1;
 627         else if (*ep)
 628                 return error("unrecognized reflog param '%s'", arg);
 629         else
 630                 *base = NULL;
 631         if (reflog <= 0)
 632                 reflog = DEFAULT_REFLOG;
 633         return 0;
 634 }
 635
 636 int cmd_show_branch(int ac,
 637                 const char **av,
 638                 const char *prefix,
 639                 struct repository *repo UNUSED)
 640 {
 641         struct commit *rev[MAX_REVS], *commit;
 642         char *reflog_msg[MAX_REVS] = {0};
 643         struct commit_list *list = NULL, *seen = NULL;
 644         unsigned int rev_mask[MAX_REVS];
 645         int num_rev, i, extra = 0;
 646         int all_heads = 0, all_remotes = 0;
 647         int all_mask, all_revs;
 648         enum rev_sort_order sort_order = REV_SORT_IN_GRAPH_ORDER;
 649         char *head;
 650         struct object_id head_oid;
 651         int merge_base = 0;
 652         int independent = 0;
 653         int no_name = 0;
 654         int sha1_name = 0;
 655         int shown_merge_point = 0;
 656         int with_current_branch = 0;
 657         int head_at = -1;
 658         int topics = 0;
 659         int sparse = 0;
 660         const char *reflog_base = NULL;
 661         struct option builtin_show_branch_options[] = {
 662                 OPT_BOOL('a', "all", &all_heads,
 663                          N_("show remote-tracking and local branches")),
 664                 OPT_BOOL('r', "remotes", &all_remotes,
 665                          N_("show remote-tracking branches")),
 666                 OPT__COLOR(&showbranch_use_color,
 667                             N_("color '*!+-' corresponding to the branch")),
 668                 { OPTION_INTEGER, 0, "more", &extra, N_("n"),
 669                             N_("show <n> more commits after the common ancestor"),
 670                             PARSE_OPT_OPTARG, NULL, (intptr_t)1 },
 671                 OPT_SET_INT(0, "list", &extra, N_("synonym to more=-1"), -1),
 672                 OPT_BOOL(0, "no-name", &no_name, N_("suppress naming strings")),
 673                 OPT_BOOL(0, "current", &with_current_branch,
 674                          N_("include the current branch")),
 675                 OPT_BOOL(0, "sha1-name", &sha1_name,
 676                          N_("name commits with their object names")),
 677                 OPT_BOOL(0, "merge-base", &merge_base,
 678                          N_("show possible merge bases")),
 679                 OPT_BOOL(0, "independent", &independent,
 680                             N_("show refs unreachable from any other ref")),
 681                 OPT_SET_INT_F(0, "topo-order", &sort_order,
 682                               N_("show commits in topological order"),
 683                               REV_SORT_IN_GRAPH_ORDER, PARSE_OPT_NONEG),
 684                 OPT_BOOL(0, "topics", &topics,
 685                          N_("show only commits not on the first branch")),
 686                 OPT_SET_INT(0, "sparse", &sparse,
 687                             N_("show merges reachable from only one tip"), 1),
 688                 OPT_SET_INT_F(0, "date-order", &sort_order,
 689                               N_("topologically sort, maintaining date order "
 690                                  "where possible"),
 691                               REV_SORT_BY_COMMIT_DATE, PARSE_OPT_NONEG),
 692                 OPT_CALLBACK_F('g', "reflog", &reflog_base, N_("<n>[,<base>]"),
 693                             N_("show <n> most recent ref-log entries starting at "
 694                                "base"),
 695                             PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
 696                             parse_reflog_param),
 697                 OPT_END()
 698         };
 699         const char **args_copy = NULL;
 700         int ret;
 701
 702         init_commit_name_slab(&name_slab);
 703
 704         git_config(git_show_branch_config, NULL);
 705
 706         /* If nothing is specified, try the default first */
 707         if (ac == 1 && default_args.nr) {
 708                 DUP_ARRAY(args_copy, default_args.v, default_args.nr);
 709                 ac = default_args.nr;
 710                 av = args_copy;
 711         }
 712
 713         ac = parse_options(ac, av, prefix, builtin_show_branch_options,
 714                            show_branch_usage, PARSE_OPT_STOP_AT_NON_OPTION);
 715         if (all_heads)
 716                 all_remotes = 1;
 717
 718         if (extra || reflog) {
 719                 /* "listing" mode is incompatible with
 720                  * independent nor merge-base modes.
 721                  */
 722                 if (independent || merge_base)
 723                         usage_with_options(show_branch_usage,
 724                                            builtin_show_branch_options);
 725                 if (reflog && ((0 < extra) || all_heads || all_remotes))
 726                         /*
 727                          * Asking for --more in reflog mode does not
 728                          * make sense.  --list is Ok.
 729                          *
 730                          * Also --all and --remotes do not make sense either.
 731                          */
 732                         die(_("options '%s' and '%s' cannot be used together"), "--reflog",
 733                                 "--all/--remotes/--independent/--merge-base");
 734         }
 735
 736         if (with_current_branch && reflog)
 737                 die(_("options '%s' and '%s' cannot be used together"),
 738                     "--reflog", "--current");
 739
 740         /* If nothing is specified, show all branches by default */
 741         if (ac <= topics && all_heads + all_remotes == 0)
 742                 all_heads = 1;
 743
 744         if (reflog) {
 745                 struct object_id oid;
 746                 char *ref;
 747                 int base = 0;
 748                 unsigned int flags = 0;
 749
 750                 if (ac == 0) {
 751                         static const char *fake_av[2];
 752
 753                         fake_av[0] = refs_resolve_refdup(get_main_ref_store(the_repository),
 754                                                          "HEAD",
 755                                                          RESOLVE_REF_READING,
 756                                                          &oid,
 757                                                          NULL);
 758                         fake_av[1] = NULL;
 759                         av = fake_av;
 760                         ac = 1;
 761                         if (!*av)
 762                                 die(_("no branches given, and HEAD is not valid"));
 763                 }
 764                 if (ac != 1)
 765                         die(_("--reflog option needs one branch name"));
 766
 767                 if (MAX_REVS < reflog)
 768                         die(Q_("only %d entry can be shown at one time.",
 769                                "only %d entries can be shown at one time.",
 770                                MAX_REVS), MAX_REVS);
 771                 if (!repo_dwim_ref(the_repository, *av, strlen(*av), &oid,
 772                                    &ref, 0))
 773                         die(_("no such ref %s"), *av);
 774
 775                 /* Has the base been specified? */
 776                 if (reflog_base) {
 777                         char *ep;
 778                         base = strtoul(reflog_base, &ep, 10);
 779                         if (*ep) {
 780                                 /* Ah, that is a date spec... */
 781                                 timestamp_t at;
 782                                 at = approxidate(reflog_base);
 783                                 read_ref_at(get_main_ref_store(the_repository),
 784                                             ref, flags, at, -1, &oid, NULL,
 785                                             NULL, NULL, &base);
 786                         }
 787                 }
 788
 789                 for (i = 0; i < reflog; i++) {
 790                         char *logmsg = NULL;
 791                         char *nth_desc;
 792                         const char *msg;
 793                         char *end;
 794                         timestamp_t timestamp;
 795                         int tz;
 796
 797                         if (read_ref_at(get_main_ref_store(the_repository),
 798                                         ref, flags, 0, base + i, &oid, &logmsg,
 799                                         &timestamp, &tz, NULL)) {
 800                                 free(logmsg);
 801                                 reflog = i;
 802                                 break;
 803                         }
 804
 805                         end = strchr(logmsg, '\n');
 806                         if (end)
 807                                 *end = '\0';
 808
 809                         msg = (*logmsg == '\0') ? "(none)" : logmsg;
 810                         reflog_msg[i] = xstrfmt("(%s) %s",
 811                                                 show_date(timestamp, tz,
 812                                                           DATE_MODE(RELATIVE)),
 813                                                 msg);
 814                         free(logmsg);
 815
 816                         nth_desc = xstrfmt("%s@{%d}", *av, base+i);
 817                         append_ref(nth_desc, &oid, 1);
 818                         free(nth_desc);
 819                 }
 820                 free(ref);
 821         }
 822         else {
 823                 while (0 < ac) {
 824                         append_one_rev(*av);
 825                         ac--; av++;
 826                 }
 827                 if (all_heads + all_remotes)
 828                         snarf_refs(all_heads, all_remotes);
 829         }
 830
 831         head = refs_resolve_refdup(get_main_ref_store(the_repository), "HEAD",
 832                                    RESOLVE_REF_READING,
 833                                    &head_oid, NULL);
 834
 835         if (with_current_branch && head) {
 836                 int has_head = 0;
 837                 for (i = 0; !has_head && i < ref_name_cnt; i++) {
 838                         /* We are only interested in adding the branch
 839                          * HEAD points at.
 840                          */
 841                         if (rev_is_head(head, ref_name[i]))
 842                                 has_head++;
 843                 }
 844                 if (!has_head) {
 845                         const char *name = head;
 846                         skip_prefix(name, "refs/heads/", &name);
 847                         append_one_rev(name);
 848                 }
 849         }
 850
 851         if (!ref_name_cnt) {
 852                 fprintf(stderr, "No revs to be shown.\n");
 853                 ret = 0;
 854                 goto out;
 855         }
 856
 857         for (num_rev = 0; ref_name[num_rev]; num_rev++) {
 858                 struct object_id revkey;
 859                 unsigned int flag = 1u << (num_rev + REV_SHIFT);
 860
 861                 if (MAX_REVS <= num_rev)
 862                         die(Q_("cannot handle more than %d rev.",
 863                                "cannot handle more than %d revs.",
 864                                MAX_REVS), MAX_REVS);
 865                 if (repo_get_oid(the_repository, ref_name[num_rev], &revkey))
 866                         die(_("'%s' is not a valid ref."), ref_name[num_rev]);
 867                 commit = lookup_commit_reference(the_repository, &revkey);
 868                 if (!commit)
 869                         die(_("cannot find commit %s (%s)"),
 870                             ref_name[num_rev], oid_to_hex(&revkey));
 871                 repo_parse_commit(the_repository, commit);
 872                 mark_seen(commit, &seen);
 873
 874                 /* rev#0 uses bit REV_SHIFT, rev#1 uses bit REV_SHIFT+1,
 875                  * and so on.  REV_SHIFT bits from bit 0 are used for
 876                  * internal bookkeeping.
 877                  */
 878                 commit->object.flags |= flag;
 879                 if (commit->object.flags == flag)
 880                         commit_list_insert_by_date(commit, &list);
 881                 rev[num_rev] = commit;
 882         }
 883         for (i = 0; i < num_rev; i++)
 884                 rev_mask[i] = rev[i]->object.flags;
 885
 886         if (0 <= extra)
 887                 join_revs(&list, &seen, num_rev, extra);
 888
 889         commit_list_sort_by_date(&seen);
 890
 891         if (merge_base) {
 892                 ret = show_merge_base(seen, num_rev);
 893                 goto out;
 894         }
 895
 896         if (independent) {
 897                 ret = show_independent(rev, num_rev, rev_mask);
 898                 goto out;
 899         }
 900
 901         /* Show list; --more=-1 means list-only */
 902         if (1 < num_rev || extra < 0) {
 903                 for (i = 0; i < num_rev; i++) {
 904                         int j;
 905                         int is_head = rev_is_head(head, ref_name[i]) &&
 906                                       oideq(&head_oid, &rev[i]->object.oid);
 907                         if (extra < 0)
 908                                 printf("%c [%s] ",
 909                                        is_head ? '*' : ' ', ref_name[i]);
 910                         else {
 911                                 for (j = 0; j < i; j++)
 912                                         putchar(' ');
 913                                 printf("%s%c%s [%s] ",
 914                                        get_color_code(i),
 915                                        is_head ? '*' : '!',
 916                                        get_color_reset_code(), ref_name[i]);
 917                         }
 918
 919                         if (!reflog) {
 920                                 /* header lines never need name */
 921                                 show_one_commit(rev[i], 1);
 922                         }
 923                         else
 924                                 puts(reflog_msg[i]);
 925
 926                         if (is_head)
 927                                 head_at = i;
 928                 }
 929                 if (0 <= extra) {
 930                         for (i = 0; i < num_rev; i++)
 931                                 putchar('-');
 932                         putchar('\n');
 933                 }
 934         }
 935         if (extra < 0) {
 936                 ret = 0;
 937                 goto out;
 938         }
 939
 940         /* Sort topologically */
 941         sort_in_topological_order(&seen, sort_order);
 942
 943         /* Give names to commits */
 944         if (!sha1_name && !no_name)
 945                 name_commits(seen, rev, ref_name, num_rev);
 946
 947         all_mask = ((1u << (REV_SHIFT + num_rev)) - 1);
 948         all_revs = all_mask & ~((1u << REV_SHIFT) - 1);
 949
 950         for (struct commit_list *l = seen; l; l = l->next) {
 951                 struct commit *commit = l->item;
 952                 int this_flag = commit->object.flags;
 953                 int is_merge_point = ((this_flag & all_revs) == all_revs);
 954
 955                 shown_merge_point |= is_merge_point;
 956
 957                 if (1 < num_rev) {
 958                         int is_merge = !!(commit->parents &&
 959                                           commit->parents->next);
 960                         if (topics &&
 961                             !is_merge_point &&
 962                             (this_flag & (1u << REV_SHIFT)))
 963                                 continue;
 964                         if (!sparse && is_merge &&
 965                             omit_in_dense(commit, rev, num_rev))
 966                                 continue;
 967                         for (i = 0; i < num_rev; i++) {
 968                                 int mark;
 969                                 if (!(this_flag & (1u << (i + REV_SHIFT))))
 970                                         mark = ' ';
 971                                 else if (is_merge)
 972                                         mark = '-';
 973                                 else if (i == head_at)
 974                                         mark = '*';
 975                                 else
 976                                         mark = '+';
 977                                 if (mark == ' ')
 978                                         putchar(mark);
 979                                 else
 980                                         printf("%s%c%s",
 981                                                get_color_code(i),
 982                                                mark, get_color_reset_code());
 983                         }
 984                         putchar(' ');
 985                 }
 986                 show_one_commit(commit, no_name);
 987
 988                 if (shown_merge_point && --extra < 0)
 989                         break;
 990         }
 991
 992         ret = 0;
 993
 994 out:
 995         for (size_t i = 0; i < ARRAY_SIZE(reflog_msg); i++)
 996                 free(reflog_msg[i]);
 997         free_commit_list(seen);
 998         free_commit_list(list);
 999         free(args_copy);
1000         free(head);
1001         return ret;
1002 }