builtin/branch.c

   1 /*
   2  * Builtin "git branch"
   3  *
   4  * Copyright (c) 2006 Kristian Høgsberg <krh@redhat.com>
   5  * Based on git-branch.sh by Junio C Hamano.
   6  */
   7
   8 #include "cache.h"
   9 #include "color.h"
  10 #include "refs.h"
  11 #include "commit.h"
  12 #include "builtin.h"
  13 #include "remote.h"
  14 #include "parse-options.h"
  15 #include "branch.h"
  16 #include "diff.h"
  17 #include "revision.h"
  18 #include "string-list.h"
  19 #include "column.h"
  20 #include "utf8.h"
  21 #include "wt-status.h"
  22
  23 static const char * const builtin_branch_usage[] = {
  24         N_("git branch [options] [-r | -a] [--merged | --no-merged]"),
  25         N_("git branch [options] [-l] [-f] <branchname> [<start-point>]"),
  26         N_("git branch [options] [-r] (-d | -D) <branchname>..."),
  27         N_("git branch [options] (-m | -M) [<oldbranch>] <newbranch>"),
  28         NULL
  29 };
  30
  31 #define REF_LOCAL_BRANCH    0x01
  32 #define REF_REMOTE_BRANCH   0x02
  33
  34 static const char *head;
  35 static unsigned char head_sha1[20];
  36
  37 static int branch_use_color = -1;
  38 static char branch_colors[][COLOR_MAXLEN] = {
  39         GIT_COLOR_RESET,
  40         GIT_COLOR_NORMAL,       /* PLAIN */
  41         GIT_COLOR_RED,          /* REMOTE */
  42         GIT_COLOR_NORMAL,       /* LOCAL */
  43         GIT_COLOR_GREEN,        /* CURRENT */
  44         GIT_COLOR_BLUE,         /* UPSTREAM */
  45 };
  46 enum color_branch {
  47         BRANCH_COLOR_RESET = 0,
  48         BRANCH_COLOR_PLAIN = 1,
  49         BRANCH_COLOR_REMOTE = 2,
  50         BRANCH_COLOR_LOCAL = 3,
  51         BRANCH_COLOR_CURRENT = 4,
  52         BRANCH_COLOR_UPSTREAM = 5
  53 };
  54
  55 static enum merge_filter {
  56         NO_FILTER = 0,
  57         SHOW_NOT_MERGED,
  58         SHOW_MERGED
  59 } merge_filter;
  60 static unsigned char merge_filter_ref[20];
  61
  62 static struct string_list output = STRING_LIST_INIT_DUP;
  63 static unsigned int colopts;
  64
  65 static int parse_branch_color_slot(const char *var, int ofs)
  66 {
  67         if (!strcasecmp(var+ofs, "plain"))
  68                 return BRANCH_COLOR_PLAIN;
  69         if (!strcasecmp(var+ofs, "reset"))
  70                 return BRANCH_COLOR_RESET;
  71         if (!strcasecmp(var+ofs, "remote"))
  72                 return BRANCH_COLOR_REMOTE;
  73         if (!strcasecmp(var+ofs, "local"))
  74                 return BRANCH_COLOR_LOCAL;
  75         if (!strcasecmp(var+ofs, "current"))
  76                 return BRANCH_COLOR_CURRENT;
  77         if (!strcasecmp(var+ofs, "upstream"))
  78                 return BRANCH_COLOR_UPSTREAM;
  79         return -1;
  80 }
  81
  82 static int git_branch_config(const char *var, const char *value, void *cb)
  83 {
  84         if (!prefixcmp(var, "column."))
  85                 return git_column_config(var, value, "branch", &colopts);
  86         if (!strcmp(var, "color.branch")) {
  87                 branch_use_color = git_config_colorbool(var, value);
  88                 return 0;
  89         }
  90         if (!prefixcmp(var, "color.branch.")) {
  91                 int slot = parse_branch_color_slot(var, 13);
  92                 if (slot < 0)
  93                         return 0;
  94                 if (!value)
  95                         return config_error_nonbool(var);
  96                 color_parse(value, var, branch_colors[slot]);
  97                 return 0;
  98         }
  99         return git_color_default_config(var, value, cb);
 100 }
 101
 102 static const char *branch_get_color(enum color_branch ix)
 103 {
 104         if (want_color(branch_use_color))
 105                 return branch_colors[ix];
 106         return "";
 107 }
 108
 109 static int branch_merged(int kind, const char *name,
 110                          struct commit *rev, struct commit *head_rev)
 111 {
 112         /*
 113          * This checks whether the merge bases of branch and HEAD (or
 114          * the other branch this branch builds upon) contains the
 115          * branch, which means that the branch has already been merged
 116          * safely to HEAD (or the other branch).
 117          */
 118         struct commit *reference_rev = NULL;
 119         const char *reference_name = NULL;
 120         void *reference_name_to_free = NULL;
 121         int merged;
 122
 123         if (kind == REF_LOCAL_BRANCH) {
 124                 struct branch *branch = branch_get(name);
 125                 unsigned char sha1[20];
 126
 127                 if (branch &&
 128                     branch->merge &&
 129                     branch->merge[0] &&
 130                     branch->merge[0]->dst &&
 131                     (reference_name = reference_name_to_free =
 132                      resolve_refdup(branch->merge[0]->dst, sha1, 1, NULL)) != NULL)
 133                         reference_rev = lookup_commit_reference(sha1);
 134         }
 135         if (!reference_rev)
 136                 reference_rev = head_rev;
 137
 138         merged = in_merge_bases(rev, reference_rev);
 139
 140         /*
 141          * After the safety valve is fully redefined to "check with
 142          * upstream, if any, otherwise with HEAD", we should just
 143          * return the result of the in_merge_bases() above without
 144          * any of the following code, but during the transition period,
 145          * a gentle reminder is in order.
 146          */
 147         if ((head_rev != reference_rev) &&
 148             in_merge_bases(rev, head_rev) != merged) {
 149                 if (merged)
 150                         warning(_("deleting branch '%s' that has been merged to\n"
 151                                 "         '%s', but not yet merged to HEAD."),
 152                                 name, reference_name);
 153                 else
 154                         warning(_("not deleting branch '%s' that is not yet merged to\n"
 155                                 "         '%s', even though it is merged to HEAD."),
 156                                 name, reference_name);
 157         }
 158         free(reference_name_to_free);
 159         return merged;
 160 }
 161
 162 static int check_branch_commit(const char *branchname, const char *refname,
 163                                unsigned char *sha1, struct commit *head_rev,
 164                                int kinds, int force)
 165 {
 166         struct commit *rev = lookup_commit_reference(sha1);
 167         if (!rev) {
 168                 error(_("Couldn't look up commit object for '%s'"), refname);
 169                 return -1;
 170         }
 171         if (!force && !branch_merged(kinds, branchname, rev, head_rev)) {
 172                 error(_("The branch '%s' is not fully merged.\n"
 173                       "If you are sure you want to delete it, "
 174                       "run 'git branch -D %s'."), branchname, branchname);
 175                 return -1;
 176         }
 177         return 0;
 178 }
 179
 180 static void delete_branch_config(const char *branchname)
 181 {
 182         struct strbuf buf = STRBUF_INIT;
 183         strbuf_addf(&buf, "branch.%s", branchname);
 184         if (git_config_rename_section(buf.buf, NULL) < 0)
 185                 warning(_("Update of config-file failed"));
 186         strbuf_release(&buf);
 187 }
 188
 189 static int delete_branches(int argc, const char **argv, int force, int kinds,
 190                            int quiet)
 191 {
 192         struct commit *head_rev = NULL;
 193         unsigned char sha1[20];
 194         char *name = NULL;
 195         const char *fmt;
 196         int i;
 197         int ret = 0;
 198         int remote_branch = 0;
 199         struct strbuf bname = STRBUF_INIT;
 200
 201         switch (kinds) {
 202         case REF_REMOTE_BRANCH:
 203                 fmt = "refs/remotes/%s";
 204                 /* For subsequent UI messages */
 205                 remote_branch = 1;
 206
 207                 force = 1;
 208                 break;
 209         case REF_LOCAL_BRANCH:
 210                 fmt = "refs/heads/%s";
 211                 break;
 212         default:
 213                 die(_("cannot use -a with -d"));
 214         }
 215
 216         if (!force) {
 217                 head_rev = lookup_commit_reference(head_sha1);
 218                 if (!head_rev)
 219                         die(_("Couldn't look up commit object for HEAD"));
 220         }
 221         for (i = 0; i < argc; i++, strbuf_release(&bname)) {
 222                 const char *target;
 223                 int flags = 0;
 224
 225                 strbuf_branchname(&bname, argv[i]);
 226                 if (kinds == REF_LOCAL_BRANCH && !strcmp(head, bname.buf)) {
 227                         error(_("Cannot delete the branch '%s' "
 228                               "which you are currently on."), bname.buf);
 229                         ret = 1;
 230                         continue;
 231                 }
 232
 233                 free(name);
 234
 235                 name = mkpathdup(fmt, bname.buf);
 236                 target = resolve_ref_unsafe(name, sha1, 0, &flags);
 237                 if (!target ||
 238                     (!(flags & REF_ISSYMREF) && is_null_sha1(sha1))) {
 239                         error(remote_branch
 240                               ? _("remote branch '%s' not found.")
 241                               : _("branch '%s' not found."), bname.buf);
 242                         ret = 1;
 243                         continue;
 244                 }
 245
 246                 if (!(flags & REF_ISSYMREF) &&
 247                     check_branch_commit(bname.buf, name, sha1, head_rev, kinds,
 248                                         force)) {
 249                         ret = 1;
 250                         continue;
 251                 }
 252
 253                 if (delete_ref(name, sha1, REF_NODEREF)) {
 254                         error(remote_branch
 255                               ? _("Error deleting remote branch '%s'")
 256                               : _("Error deleting branch '%s'"),
 257                               bname.buf);
 258                         ret = 1;
 259                         continue;
 260                 }
 261                 if (!quiet) {
 262                         printf(remote_branch
 263                                ? _("Deleted remote branch %s (was %s).\n")
 264                                : _("Deleted branch %s (was %s).\n"),
 265                                bname.buf,
 266                                (flags & REF_ISSYMREF)
 267                                ? target
 268                                : find_unique_abbrev(sha1, DEFAULT_ABBREV));
 269                 }
 270                 delete_branch_config(bname.buf);
 271         }
 272
 273         free(name);
 274
 275         return(ret);
 276 }
 277
 278 struct ref_item {
 279         char *name;
 280         char *dest;
 281         unsigned int kind, width;
 282         struct commit *commit;
 283 };
 284
 285 struct ref_list {
 286         struct rev_info revs;
 287         int index, alloc, maxwidth, verbose, abbrev;
 288         struct ref_item *list;
 289         struct commit_list *with_commit;
 290         int kinds;
 291 };
 292
 293 static char *resolve_symref(const char *src, const char *prefix)
 294 {
 295         unsigned char sha1[20];
 296         int flag;
 297         const char *dst, *cp;
 298
 299         dst = resolve_ref_unsafe(src, sha1, 0, &flag);
 300         if (!(dst && (flag & REF_ISSYMREF)))
 301                 return NULL;
 302         if (prefix && (cp = skip_prefix(dst, prefix)))
 303                 dst = cp;
 304         return xstrdup(dst);
 305 }
 306
 307 struct append_ref_cb {
 308         struct ref_list *ref_list;
 309         const char **pattern;
 310         int ret;
 311 };
 312
 313 static int match_patterns(const char **pattern, const char *refname)
 314 {
 315         if (!*pattern)
 316                 return 1; /* no pattern always matches */
 317         while (*pattern) {
 318                 if (!fnmatch(*pattern, refname, 0))
 319                         return 1;
 320                 pattern++;
 321         }
 322         return 0;
 323 }
 324
 325 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 326 {
 327         struct append_ref_cb *cb = (struct append_ref_cb *)(cb_data);
 328         struct ref_list *ref_list = cb->ref_list;
 329         struct ref_item *newitem;
 330         struct commit *commit;
 331         int kind, i;
 332         const char *prefix, *orig_refname = refname;
 333
 334         static struct {
 335                 int kind;
 336                 const char *prefix;
 337                 int pfxlen;
 338         } ref_kind[] = {
 339                 { REF_LOCAL_BRANCH, "refs/heads/", 11 },
 340                 { REF_REMOTE_BRANCH, "refs/remotes/", 13 },
 341         };
 342
 343         /* Detect kind */
 344         for (i = 0; i < ARRAY_SIZE(ref_kind); i++) {
 345                 prefix = ref_kind[i].prefix;
 346                 if (strncmp(refname, prefix, ref_kind[i].pfxlen))
 347                         continue;
 348                 kind = ref_kind[i].kind;
 349                 refname += ref_kind[i].pfxlen;
 350                 break;
 351         }
 352         if (ARRAY_SIZE(ref_kind) <= i)
 353                 return 0;
 354
 355         /* Don't add types the caller doesn't want */
 356         if ((kind & ref_list->kinds) == 0)
 357                 return 0;
 358
 359         if (!match_patterns(cb->pattern, refname))
 360                 return 0;
 361
 362         commit = NULL;
 363         if (ref_list->verbose || ref_list->with_commit || merge_filter != NO_FILTER) {
 364                 commit = lookup_commit_reference_gently(sha1, 1);
 365                 if (!commit) {
 366                         cb->ret = error(_("branch '%s' does not point at a commit"), refname);
 367                         return 0;
 368                 }
 369
 370                 /* Filter with with_commit if specified */
 371                 if (!is_descendant_of(commit, ref_list->with_commit))
 372                         return 0;
 373
 374                 if (merge_filter != NO_FILTER)
 375                         add_pending_object(&ref_list->revs,
 376                                            (struct object *)commit, refname);
 377         }
 378
 379         ALLOC_GROW(ref_list->list, ref_list->index + 1, ref_list->alloc);
 380
 381         /* Record the new item */
 382         newitem = &(ref_list->list[ref_list->index++]);
 383         newitem->name = xstrdup(refname);
 384         newitem->kind = kind;
 385         newitem->commit = commit;
 386         newitem->width = utf8_strwidth(refname);
 387         newitem->dest = resolve_symref(orig_refname, prefix);
 388         /* adjust for "remotes/" */
 389         if (newitem->kind == REF_REMOTE_BRANCH &&
 390             ref_list->kinds != REF_REMOTE_BRANCH)
 391                 newitem->width += 8;
 392         if (newitem->width > ref_list->maxwidth)
 393                 ref_list->maxwidth = newitem->width;
 394
 395         return 0;
 396 }
 397
 398 static void free_ref_list(struct ref_list *ref_list)
 399 {
 400         int i;
 401
 402         for (i = 0; i < ref_list->index; i++) {
 403                 free(ref_list->list[i].name);
 404                 free(ref_list->list[i].dest);
 405         }
 406         free(ref_list->list);
 407 }
 408
 409 static int ref_cmp(const void *r1, const void *r2)
 410 {
 411         struct ref_item *c1 = (struct ref_item *)(r1);
 412         struct ref_item *c2 = (struct ref_item *)(r2);
 413
 414         if (c1->kind != c2->kind)
 415                 return c1->kind - c2->kind;
 416         return strcmp(c1->name, c2->name);
 417 }
 418
 419 static void fill_tracking_info(struct strbuf *stat, const char *branch_name,
 420                 int show_upstream_ref)
 421 {
 422         int ours, theirs;
 423         char *ref = NULL;
 424         struct branch *branch = branch_get(branch_name);
 425         struct strbuf fancy = STRBUF_INIT;
 426
 427         if (!stat_tracking_info(branch, &ours, &theirs)) {
 428                 if (branch && branch->merge && branch->merge[0]->dst &&
 429                     show_upstream_ref) {
 430                         ref = shorten_unambiguous_ref(branch->merge[0]->dst, 0);
 431                         if (want_color(branch_use_color))
 432                                 strbuf_addf(stat, "[%s%s%s] ",
 433                                                 branch_get_color(BRANCH_COLOR_UPSTREAM),
 434                                                 ref, branch_get_color(BRANCH_COLOR_RESET));
 435                         else
 436                                 strbuf_addf(stat, "[%s] ", ref);
 437                 }
 438                 return;
 439         }
 440
 441         if (show_upstream_ref) {
 442                 ref = shorten_unambiguous_ref(branch->merge[0]->dst, 0);
 443                 if (want_color(branch_use_color))
 444                         strbuf_addf(&fancy, "%s%s%s",
 445                                         branch_get_color(BRANCH_COLOR_UPSTREAM),
 446                                         ref, branch_get_color(BRANCH_COLOR_RESET));
 447                 else
 448                         strbuf_addstr(&fancy, ref);
 449         }
 450
 451         if (!ours) {
 452                 if (ref)
 453                         strbuf_addf(stat, _("[%s: behind %d]"), fancy.buf, theirs);
 454                 else
 455                         strbuf_addf(stat, _("[behind %d]"), theirs);
 456
 457         } else if (!theirs) {
 458                 if (ref)
 459                         strbuf_addf(stat, _("[%s: ahead %d]"), fancy.buf, ours);
 460                 else
 461                         strbuf_addf(stat, _("[ahead %d]"), ours);
 462         } else {
 463                 if (ref)
 464                         strbuf_addf(stat, _("[%s: ahead %d, behind %d]"),
 465                                     fancy.buf, ours, theirs);
 466                 else
 467                         strbuf_addf(stat, _("[ahead %d, behind %d]"),
 468                                     ours, theirs);
 469         }
 470         strbuf_release(&fancy);
 471         strbuf_addch(stat, ' ');
 472         free(ref);
 473 }
 474
 475 static int matches_merge_filter(struct commit *commit)
 476 {
 477         int is_merged;
 478
 479         if (merge_filter == NO_FILTER)
 480                 return 1;
 481
 482         is_merged = !!(commit->object.flags & UNINTERESTING);
 483         return (is_merged == (merge_filter == SHOW_MERGED));
 484 }
 485
 486 static void add_verbose_info(struct strbuf *out, struct ref_item *item,
 487                              int verbose, int abbrev)
 488 {
 489         struct strbuf subject = STRBUF_INIT, stat = STRBUF_INIT;
 490         const char *sub = _(" **** invalid ref ****");
 491         struct commit *commit = item->commit;
 492
 493         if (commit && !parse_commit(commit)) {
 494                 pp_commit_easy(CMIT_FMT_ONELINE, commit, &subject);
 495                 sub = subject.buf;
 496         }
 497
 498         if (item->kind == REF_LOCAL_BRANCH)
 499                 fill_tracking_info(&stat, item->name, verbose > 1);
 500
 501         strbuf_addf(out, " %s %s%s",
 502                 find_unique_abbrev(item->commit->object.sha1, abbrev),
 503                 stat.buf, sub);
 504         strbuf_release(&stat);
 505         strbuf_release(&subject);
 506 }
 507
 508 static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 509                            int abbrev, int current, char *prefix)
 510 {
 511         char c;
 512         int color;
 513         struct commit *commit = item->commit;
 514         struct strbuf out = STRBUF_INIT, name = STRBUF_INIT;
 515
 516         if (!matches_merge_filter(commit))
 517                 return;
 518
 519         switch (item->kind) {
 520         case REF_LOCAL_BRANCH:
 521                 color = BRANCH_COLOR_LOCAL;
 522                 break;
 523         case REF_REMOTE_BRANCH:
 524                 color = BRANCH_COLOR_REMOTE;
 525                 break;
 526         default:
 527                 color = BRANCH_COLOR_PLAIN;
 528                 break;
 529         }
 530
 531         c = ' ';
 532         if (current) {
 533                 c = '*';
 534                 color = BRANCH_COLOR_CURRENT;
 535         }
 536
 537         strbuf_addf(&name, "%s%s", prefix, item->name);
 538         if (verbose) {
 539                 int utf8_compensation = strlen(name.buf) - utf8_strwidth(name.buf);
 540                 strbuf_addf(&out, "%c %s%-*s%s", c, branch_get_color(color),
 541                             maxwidth + utf8_compensation, name.buf,
 542                             branch_get_color(BRANCH_COLOR_RESET));
 543         } else
 544                 strbuf_addf(&out, "%c %s%s%s", c, branch_get_color(color),
 545                             name.buf, branch_get_color(BRANCH_COLOR_RESET));
 546
 547         if (item->dest)
 548                 strbuf_addf(&out, " -> %s", item->dest);
 549         else if (verbose)
 550                 /* " f7c0c00 [ahead 58, behind 197] vcs-svn: drop obj_pool.h" */
 551                 add_verbose_info(&out, item, verbose, abbrev);
 552         if (column_active(colopts)) {
 553                 assert(!verbose && "--column and --verbose are incompatible");
 554                 string_list_append(&output, out.buf);
 555         } else {
 556                 printf("%s\n", out.buf);
 557         }
 558         strbuf_release(&name);
 559         strbuf_release(&out);
 560 }
 561
 562 static int calc_maxwidth(struct ref_list *refs)
 563 {
 564         int i, w = 0;
 565         for (i = 0; i < refs->index; i++) {
 566                 if (!matches_merge_filter(refs->list[i].commit))
 567                         continue;
 568                 if (refs->list[i].width > w)
 569                         w = refs->list[i].width;
 570         }
 571         return w;
 572 }
 573
 574 static char *get_head_description(void)
 575 {
 576         struct strbuf desc = STRBUF_INIT;
 577         struct wt_status_state state;
 578         memset(&state, 0, sizeof(state));
 579         wt_status_get_state(&state, 1);
 580         if (state.rebase_in_progress ||
 581             state.rebase_interactive_in_progress)
 582                 strbuf_addf(&desc, _("(no branch, rebasing %s)"),
 583                             state.branch);
 584         else if (state.bisect_in_progress)
 585                 strbuf_addf(&desc, _("(no branch, bisect started on %s)"),
 586                             state.branch);
 587         else if (state.detached_from)
 588                 strbuf_addf(&desc, _("(detached from %s)"),
 589                             state.detached_from);
 590         else
 591                 strbuf_addstr(&desc, _("(no branch)"));
 592         free(state.branch);
 593         free(state.onto);
 594         free(state.detached_from);
 595         return strbuf_detach(&desc, NULL);
 596 }
 597
 598 static void show_detached(struct ref_list *ref_list)
 599 {
 600         struct commit *head_commit = lookup_commit_reference_gently(head_sha1, 1);
 601
 602         if (head_commit && is_descendant_of(head_commit, ref_list->with_commit)) {
 603                 struct ref_item item;
 604                 item.name = get_head_description();
 605                 item.width = utf8_strwidth(item.name);
 606                 item.kind = REF_LOCAL_BRANCH;
 607                 item.dest = NULL;
 608                 item.commit = head_commit;
 609                 if (item.width > ref_list->maxwidth)
 610                         ref_list->maxwidth = item.width;
 611                 print_ref_item(&item, ref_list->maxwidth, ref_list->verbose, ref_list->abbrev, 1, "");
 612                 free(item.name);
 613         }
 614 }
 615
 616 static int print_ref_list(int kinds, int detached, int verbose, int abbrev, struct commit_list *with_commit, const char **pattern)
 617 {
 618         int i;
 619         struct append_ref_cb cb;
 620         struct ref_list ref_list;
 621
 622         memset(&ref_list, 0, sizeof(ref_list));
 623         ref_list.kinds = kinds;
 624         ref_list.verbose = verbose;
 625         ref_list.abbrev = abbrev;
 626         ref_list.with_commit = with_commit;
 627         if (merge_filter != NO_FILTER)
 628                 init_revisions(&ref_list.revs, NULL);
 629         cb.ref_list = &ref_list;
 630         cb.pattern = pattern;
 631         cb.ret = 0;
 632         for_each_rawref(append_ref, &cb);
 633         if (merge_filter != NO_FILTER) {
 634                 struct commit *filter;
 635                 filter = lookup_commit_reference_gently(merge_filter_ref, 0);
 636                 if (!filter)
 637                         die(_("object '%s' does not point to a commit"),
 638                             sha1_to_hex(merge_filter_ref));
 639
 640                 filter->object.flags |= UNINTERESTING;
 641                 add_pending_object(&ref_list.revs,
 642                                    (struct object *) filter, "");
 643                 ref_list.revs.limited = 1;
 644                 prepare_revision_walk(&ref_list.revs);
 645                 if (verbose)
 646                         ref_list.maxwidth = calc_maxwidth(&ref_list);
 647         }
 648
 649         qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 650
 651         detached = (detached && (kinds & REF_LOCAL_BRANCH));
 652         if (detached && match_patterns(pattern, "HEAD"))
 653                 show_detached(&ref_list);
 654
 655         for (i = 0; i < ref_list.index; i++) {
 656                 int current = !detached &&
 657                         (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
 658                         !strcmp(ref_list.list[i].name, head);
 659                 char *prefix = (kinds != REF_REMOTE_BRANCH &&
 660                                 ref_list.list[i].kind == REF_REMOTE_BRANCH)
 661                                 ? "remotes/" : "";
 662                 print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
 663                                abbrev, current, prefix);
 664         }
 665
 666         free_ref_list(&ref_list);
 667
 668         if (cb.ret)
 669                 error(_("some refs could not be read"));
 670
 671         return cb.ret;
 672 }
 673
 674 static void rename_branch(const char *oldname, const char *newname, int force)
 675 {
 676         struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT;
 677         struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT;
 678         int recovery = 0;
 679         int clobber_head_ok;
 680
 681         if (!oldname)
 682                 die(_("cannot rename the current branch while not on any."));
 683
 684         if (strbuf_check_branch_ref(&oldref, oldname)) {
 685                 /*
 686                  * Bad name --- this could be an attempt to rename a
 687                  * ref that we used to allow to be created by accident.
 688                  */
 689                 if (ref_exists(oldref.buf))
 690                         recovery = 1;
 691                 else
 692                         die(_("Invalid branch name: '%s'"), oldname);
 693         }
 694
 695         /*
 696          * A command like "git branch -M currentbranch currentbranch" cannot
 697          * cause the worktree to become inconsistent with HEAD, so allow it.
 698          */
 699         clobber_head_ok = !strcmp(oldname, newname);
 700
 701         validate_new_branchname(newname, &newref, force, clobber_head_ok);
 702
 703         strbuf_addf(&logmsg, "Branch: renamed %s to %s",
 704                  oldref.buf, newref.buf);
 705
 706         if (rename_ref(oldref.buf, newref.buf, logmsg.buf))
 707                 die(_("Branch rename failed"));
 708         strbuf_release(&logmsg);
 709
 710         if (recovery)
 711                 warning(_("Renamed a misnamed branch '%s' away"), oldref.buf + 11);
 712
 713         /* no need to pass logmsg here as HEAD didn't really move */
 714         if (!strcmp(oldname, head) && create_symref("HEAD", newref.buf, NULL))
 715                 die(_("Branch renamed to %s, but HEAD is not updated!"), newname);
 716
 717         strbuf_addf(&oldsection, "branch.%s", oldref.buf + 11);
 718         strbuf_release(&oldref);
 719         strbuf_addf(&newsection, "branch.%s", newref.buf + 11);
 720         strbuf_release(&newref);
 721         if (git_config_rename_section(oldsection.buf, newsection.buf) < 0)
 722                 die(_("Branch is renamed, but update of config-file failed"));
 723         strbuf_release(&oldsection);
 724         strbuf_release(&newsection);
 725 }
 726
 727 static int opt_parse_merge_filter(const struct option *opt, const char *arg, int unset)
 728 {
 729         merge_filter = ((opt->long_name[0] == 'n')
 730                         ? SHOW_NOT_MERGED
 731                         : SHOW_MERGED);
 732         if (unset)
 733                 merge_filter = SHOW_NOT_MERGED; /* b/c for --no-merged */
 734         if (!arg)
 735                 arg = "HEAD";
 736         if (get_sha1(arg, merge_filter_ref))
 737                 die(_("malformed object name %s"), arg);
 738         return 0;
 739 }
 740
 741 static const char edit_description[] = "BRANCH_DESCRIPTION";
 742
 743 static int edit_branch_description(const char *branch_name)
 744 {
 745         FILE *fp;
 746         int status;
 747         struct strbuf buf = STRBUF_INIT;
 748         struct strbuf name = STRBUF_INIT;
 749
 750         read_branch_desc(&buf, branch_name);
 751         if (!buf.len || buf.buf[buf.len-1] != '\n')
 752                 strbuf_addch(&buf, '\n');
 753         strbuf_commented_addf(&buf,
 754                     "Please edit the description for the branch\n"
 755                     "  %s\n"
 756                     "Lines starting with '%c' will be stripped.\n",
 757                     branch_name, comment_line_char);
 758         fp = fopen(git_path(edit_description), "w");
 759         if ((fwrite(buf.buf, 1, buf.len, fp) < buf.len) || fclose(fp)) {
 760                 strbuf_release(&buf);
 761                 return error(_("could not write branch description template: %s"),
 762                              strerror(errno));
 763         }
 764         strbuf_reset(&buf);
 765         if (launch_editor(git_path(edit_description), &buf, NULL)) {
 766                 strbuf_release(&buf);
 767                 return -1;
 768         }
 769         stripspace(&buf, 1);
 770
 771         strbuf_addf(&name, "branch.%s.description", branch_name);
 772         status = git_config_set(name.buf, buf.len ? buf.buf : NULL);
 773         strbuf_release(&name);
 774         strbuf_release(&buf);
 775
 776         return status;
 777 }
 778
 779 int cmd_branch(int argc, const char **argv, const char *prefix)
 780 {
 781         int delete = 0, rename = 0, force_create = 0, list = 0;
 782         int verbose = 0, abbrev = -1, detached = 0;
 783         int reflog = 0, edit_description = 0;
 784         int quiet = 0, unset_upstream = 0;
 785         const char *new_upstream = NULL;
 786         enum branch_track track;
 787         int kinds = REF_LOCAL_BRANCH;
 788         struct commit_list *with_commit = NULL;
 789
 790         struct option options[] = {
 791                 OPT_GROUP(N_("Generic options")),
 792                 OPT__VERBOSE(&verbose,
 793                         N_("show hash and subject, give twice for upstream branch")),
 794                 OPT__QUIET(&quiet, N_("suppress informational messages")),
 795                 OPT_SET_INT('t', "track",  &track, N_("set up tracking mode (see git-pull(1))"),
 796                         BRANCH_TRACK_EXPLICIT),
 797                 OPT_SET_INT( 0, "set-upstream",  &track, N_("change upstream info"),
 798                         BRANCH_TRACK_OVERRIDE),
 799                 OPT_STRING('u', "set-upstream-to", &new_upstream, "upstream", "change the upstream info"),
 800                 OPT_BOOLEAN(0, "unset-upstream", &unset_upstream, "Unset the upstream info"),
 801                 OPT__COLOR(&branch_use_color, N_("use colored output")),
 802                 OPT_SET_INT('r', "remotes",     &kinds, N_("act on remote-tracking branches"),
 803                         REF_REMOTE_BRANCH),
 804                 {
 805                         OPTION_CALLBACK, 0, "contains", &with_commit, N_("commit"),
 806                         N_("print only branches that contain the commit"),
 807                         PARSE_OPT_LASTARG_DEFAULT,
 808                         parse_opt_with_commit, (intptr_t)"HEAD",
 809                 },
 810                 {
 811                         OPTION_CALLBACK, 0, "with", &with_commit, N_("commit"),
 812                         N_("print only branches that contain the commit"),
 813                         PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
 814                         parse_opt_with_commit, (intptr_t) "HEAD",
 815                 },
 816                 OPT__ABBREV(&abbrev),
 817
 818                 OPT_GROUP(N_("Specific git-branch actions:")),
 819                 OPT_SET_INT('a', "all", &kinds, N_("list both remote-tracking and local branches"),
 820                         REF_REMOTE_BRANCH | REF_LOCAL_BRANCH),
 821                 OPT_BIT('d', "delete", &delete, N_("delete fully merged branch"), 1),
 822                 OPT_BIT('D', NULL, &delete, N_("delete branch (even if not merged)"), 2),
 823                 OPT_BIT('m', "move", &rename, N_("move/rename a branch and its reflog"), 1),
 824                 OPT_BIT('M', NULL, &rename, N_("move/rename a branch, even if target exists"), 2),
 825                 OPT_BOOLEAN(0, "list", &list, N_("list branch names")),
 826                 OPT_BOOLEAN('l', "create-reflog", &reflog, N_("create the branch's reflog")),
 827                 OPT_BOOLEAN(0, "edit-description", &edit_description,
 828                             N_("edit the description for the branch")),
 829                 OPT__FORCE(&force_create, N_("force creation (when already exists)")),
 830                 {
 831                         OPTION_CALLBACK, 0, "no-merged", &merge_filter_ref,
 832                         N_("commit"), N_("print only not merged branches"),
 833                         PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
 834                         opt_parse_merge_filter, (intptr_t) "HEAD",
 835                 },
 836                 {
 837                         OPTION_CALLBACK, 0, "merged", &merge_filter_ref,
 838                         N_("commit"), N_("print only merged branches"),
 839                         PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
 840                         opt_parse_merge_filter, (intptr_t) "HEAD",
 841                 },
 842                 OPT_COLUMN(0, "column", &colopts, N_("list branches in columns")),
 843                 OPT_END(),
 844         };
 845
 846         if (argc == 2 && !strcmp(argv[1], "-h"))
 847                 usage_with_options(builtin_branch_usage, options);
 848
 849         git_config(git_branch_config, NULL);
 850
 851         track = git_branch_track;
 852
 853         head = resolve_refdup("HEAD", head_sha1, 0, NULL);
 854         if (!head)
 855                 die(_("Failed to resolve HEAD as a valid ref."));
 856         if (!strcmp(head, "HEAD")) {
 857                 detached = 1;
 858         } else {
 859                 if (prefixcmp(head, "refs/heads/"))
 860                         die(_("HEAD not found below refs/heads!"));
 861                 head += 11;
 862         }
 863         hashcpy(merge_filter_ref, head_sha1);
 864
 865
 866         argc = parse_options(argc, argv, prefix, options, builtin_branch_usage,
 867                              0);
 868
 869         if (!delete && !rename && !edit_description && !new_upstream && !unset_upstream && argc == 0)
 870                 list = 1;
 871
 872         if (with_commit || merge_filter != NO_FILTER)
 873                 list = 1;
 874
 875         if (!!delete + !!rename + !!force_create + !!list + !!new_upstream + !!unset_upstream > 1)
 876                 usage_with_options(builtin_branch_usage, options);
 877
 878         if (abbrev == -1)
 879                 abbrev = DEFAULT_ABBREV;
 880         finalize_colopts(&colopts, -1);
 881         if (verbose) {
 882                 if (explicitly_enable_column(colopts))
 883                         die(_("--column and --verbose are incompatible"));
 884                 colopts = 0;
 885         }
 886
 887         if (delete) {
 888                 if (!argc)
 889                         die(_("branch name required"));
 890                 return delete_branches(argc, argv, delete > 1, kinds, quiet);
 891         } else if (list) {
 892                 int ret = print_ref_list(kinds, detached, verbose, abbrev,
 893                                          with_commit, argv);
 894                 print_columns(&output, colopts, NULL);
 895                 string_list_clear(&output, 0);
 896                 return ret;
 897         }
 898         else if (edit_description) {
 899                 const char *branch_name;
 900                 struct strbuf branch_ref = STRBUF_INIT;
 901
 902                 if (!argc) {
 903                         if (detached)
 904                                 die(_("Cannot give description to detached HEAD"));
 905                         branch_name = head;
 906                 } else if (argc == 1)
 907                         branch_name = argv[0];
 908                 else
 909                         die(_("cannot edit description of more than one branch"));
 910
 911                 strbuf_addf(&branch_ref, "refs/heads/%s", branch_name);
 912                 if (!ref_exists(branch_ref.buf)) {
 913                         strbuf_release(&branch_ref);
 914
 915                         if (!argc)
 916                                 return error(_("No commit on branch '%s' yet."),
 917                                              branch_name);
 918                         else
 919                                 return error(_("No branch named '%s'."),
 920                                              branch_name);
 921                 }
 922                 strbuf_release(&branch_ref);
 923
 924                 if (edit_branch_description(branch_name))
 925                         return 1;
 926         } else if (rename) {
 927                 if (!argc)
 928                         die(_("branch name required"));
 929                 else if (argc == 1)
 930                         rename_branch(head, argv[0], rename > 1);
 931                 else if (argc == 2)
 932                         rename_branch(argv[0], argv[1], rename > 1);
 933                 else
 934                         die(_("too many branches for a rename operation"));
 935         } else if (new_upstream) {
 936                 struct branch *branch = branch_get(argv[0]);
 937
 938                 if (argc > 1)
 939                         die(_("too many branches to set new upstream"));
 940
 941                 if (!branch) {
 942                         if (!argc || !strcmp(argv[0], "HEAD"))
 943                                 die(_("could not set upstream of HEAD to %s when "
 944                                       "it does not point to any branch."),
 945                                     new_upstream);
 946                         die(_("no such branch '%s'"), argv[0]);
 947                 }
 948
 949                 if (!ref_exists(branch->refname))
 950                         die(_("branch '%s' does not exist"), branch->name);
 951
 952                 /*
 953                  * create_branch takes care of setting up the tracking
 954                  * info and making sure new_upstream is correct
 955                  */
 956                 create_branch(head, branch->name, new_upstream, 0, 0, 0, quiet, BRANCH_TRACK_OVERRIDE);
 957         } else if (unset_upstream) {
 958                 struct branch *branch = branch_get(argv[0]);
 959                 struct strbuf buf = STRBUF_INIT;
 960
 961                 if (argc > 1)
 962                         die(_("too many branches to unset upstream"));
 963
 964                 if (!branch) {
 965                         if (!argc || !strcmp(argv[0], "HEAD"))
 966                                 die(_("could not unset upstream of HEAD when "
 967                                       "it does not point to any branch."));
 968                         die(_("no such branch '%s'"), argv[0]);
 969                 }
 970
 971                 if (!branch_has_merge_config(branch)) {
 972                         die(_("Branch '%s' has no upstream information"), branch->name);
 973                 }
 974
 975                 strbuf_addf(&buf, "branch.%s.remote", branch->name);
 976                 git_config_set_multivar(buf.buf, NULL, NULL, 1);
 977                 strbuf_reset(&buf);
 978                 strbuf_addf(&buf, "branch.%s.merge", branch->name);
 979                 git_config_set_multivar(buf.buf, NULL, NULL, 1);
 980                 strbuf_release(&buf);
 981         } else if (argc > 0 && argc <= 2) {
 982                 struct branch *branch = branch_get(argv[0]);
 983                 int branch_existed = 0, remote_tracking = 0;
 984                 struct strbuf buf = STRBUF_INIT;
 985
 986                 if (!strcmp(argv[0], "HEAD"))
 987                         die(_("it does not make sense to create 'HEAD' manually"));
 988
 989                 if (!branch)
 990                         die(_("no such branch '%s'"), argv[0]);
 991
 992                 if (kinds != REF_LOCAL_BRANCH)
 993                         die(_("-a and -r options to 'git branch' do not make sense with a branch name"));
 994
 995                 if (track == BRANCH_TRACK_OVERRIDE)
 996                         fprintf(stderr, _("The --set-upstream flag is deprecated and will be removed. Consider using --track or --set-upstream-to\n"));
 997
 998                 strbuf_addf(&buf, "refs/remotes/%s", branch->name);
 999                 remote_tracking = ref_exists(buf.buf);
1000                 strbuf_release(&buf);
1001
1002                 branch_existed = ref_exists(branch->refname);
1003                 create_branch(head, argv[0], (argc == 2) ? argv[1] : head,
1004                               force_create, reflog, 0, quiet, track);
1005
1006                 /*
1007                  * We only show the instructions if the user gave us
1008                  * one branch which doesn't exist locally, but is the
1009                  * name of a remote-tracking branch.
1010                  */
1011                 if (argc == 1 && track == BRANCH_TRACK_OVERRIDE &&
1012                     !branch_existed && remote_tracking) {
1013                         fprintf(stderr, _("\nIf you wanted to make '%s' track '%s', do this:\n\n"), head, branch->name);
1014                         fprintf(stderr, _("    git branch -d %s\n"), branch->name);
1015                         fprintf(stderr, _("    git branch --set-upstream-to %s\n"), branch->name);
1016                 }
1017
1018         } else
1019                 usage_with_options(builtin_branch_usage, options);
1020
1021         return 0;
1022 }