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