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
  19 static const char * const builtin_branch_usage[] = {
  20         "git branch [options] [-r | -a] [--merged | --no-merged]",
  21         "git branch [options] [-l] [-f] <branchname> [<start-point>]",
  22         "git branch [options] [-r] (-d | -D) <branchname>",
  23         "git branch [options] (-m | -M) [<oldbranch>] <newbranch>",
  24         NULL
  25 };
  26
  27 #define REF_LOCAL_BRANCH    0x01
  28 #define REF_REMOTE_BRANCH   0x02
  29
  30 static const char *head;
  31 static unsigned char head_sha1[20];
  32
  33 static int branch_use_color = -1;
  34 static char branch_colors[][COLOR_MAXLEN] = {
  35         "\033[m",       /* reset */
  36         "",             /* PLAIN (normal) */
  37         "\033[31m",     /* REMOTE (red) */
  38         "",             /* LOCAL (normal) */
  39         "\033[32m",     /* CURRENT (green) */
  40 };
  41 enum color_branch {
  42         COLOR_BRANCH_RESET = 0,
  43         COLOR_BRANCH_PLAIN = 1,
  44         COLOR_BRANCH_REMOTE = 2,
  45         COLOR_BRANCH_LOCAL = 3,
  46         COLOR_BRANCH_CURRENT = 4,
  47 };
  48
  49 static enum merge_filter {
  50         NO_FILTER = 0,
  51         SHOW_NOT_MERGED,
  52         SHOW_MERGED,
  53 } merge_filter;
  54 static unsigned char merge_filter_ref[20];
  55
  56 static int parse_branch_color_slot(const char *var, int ofs)
  57 {
  58         if (!strcasecmp(var+ofs, "plain"))
  59                 return COLOR_BRANCH_PLAIN;
  60         if (!strcasecmp(var+ofs, "reset"))
  61                 return COLOR_BRANCH_RESET;
  62         if (!strcasecmp(var+ofs, "remote"))
  63                 return COLOR_BRANCH_REMOTE;
  64         if (!strcasecmp(var+ofs, "local"))
  65                 return COLOR_BRANCH_LOCAL;
  66         if (!strcasecmp(var+ofs, "current"))
  67                 return COLOR_BRANCH_CURRENT;
  68         die("bad config variable '%s'", var);
  69 }
  70
  71 static int git_branch_config(const char *var, const char *value, void *cb)
  72 {
  73         if (!strcmp(var, "color.branch")) {
  74                 branch_use_color = git_config_colorbool(var, value, -1);
  75                 return 0;
  76         }
  77         if (!prefixcmp(var, "color.branch.")) {
  78                 int slot = parse_branch_color_slot(var, 13);
  79                 if (!value)
  80                         return config_error_nonbool(var);
  81                 color_parse(value, var, branch_colors[slot]);
  82                 return 0;
  83         }
  84         return git_color_default_config(var, value, cb);
  85 }
  86
  87 static const char *branch_get_color(enum color_branch ix)
  88 {
  89         if (branch_use_color > 0)
  90                 return branch_colors[ix];
  91         return "";
  92 }
  93
  94 static int delete_branches(int argc, const char **argv, int force, int kinds)
  95 {
  96         struct commit *rev, *head_rev = head_rev;
  97         unsigned char sha1[20];
  98         char *name = NULL;
  99         const char *fmt, *remote;
 100         int i;
 101         int ret = 0;
 102
 103         switch (kinds) {
 104         case REF_REMOTE_BRANCH:
 105                 fmt = "refs/remotes/%s";
 106                 remote = "remote ";
 107                 force = 1;
 108                 break;
 109         case REF_LOCAL_BRANCH:
 110                 fmt = "refs/heads/%s";
 111                 remote = "";
 112                 break;
 113         default:
 114                 die("cannot use -a with -d");
 115         }
 116
 117         if (!force) {
 118                 head_rev = lookup_commit_reference(head_sha1);
 119                 if (!head_rev)
 120                         die("Couldn't look up commit object for HEAD");
 121         }
 122         for (i = 0; i < argc; i++) {
 123                 if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
 124                         error("Cannot delete the branch '%s' "
 125                                 "which you are currently on.", argv[i]);
 126                         ret = 1;
 127                         continue;
 128                 }
 129
 130                 free(name);
 131
 132                 name = xstrdup(mkpath(fmt, argv[i]));
 133                 if (!resolve_ref(name, sha1, 1, NULL)) {
 134                         error("%sbranch '%s' not found.",
 135                                         remote, argv[i]);
 136                         ret = 1;
 137                         continue;
 138                 }
 139
 140                 rev = lookup_commit_reference(sha1);
 141                 if (!rev) {
 142                         error("Couldn't look up commit object for '%s'", name);
 143                         ret = 1;
 144                         continue;
 145                 }
 146
 147                 /* This checks whether the merge bases of branch and
 148                  * HEAD contains branch -- which means that the HEAD
 149                  * contains everything in both.
 150                  */
 151
 152                 if (!force &&
 153                     !in_merge_bases(rev, &head_rev, 1)) {
 154                         error("The branch '%s' is not an ancestor of "
 155                                 "your current HEAD.\n"
 156                                 "If you are sure you want to delete it, "
 157                                 "run 'git branch -D %s'.", argv[i], argv[i]);
 158                         ret = 1;
 159                         continue;
 160                 }
 161
 162                 if (delete_ref(name, sha1, 0)) {
 163                         error("Error deleting %sbranch '%s'", remote,
 164                                argv[i]);
 165                         ret = 1;
 166                 } else {
 167                         struct strbuf buf = STRBUF_INIT;
 168                         printf("Deleted %sbranch %s (%s).\n", remote, argv[i],
 169                                 find_unique_abbrev(sha1, DEFAULT_ABBREV));
 170                         strbuf_addf(&buf, "branch.%s", argv[i]);
 171                         if (git_config_rename_section(buf.buf, NULL) < 0)
 172                                 warning("Update of config-file failed");
 173                         strbuf_release(&buf);
 174                 }
 175         }
 176
 177         free(name);
 178
 179         return(ret);
 180 }
 181
 182 struct ref_item {
 183         char *name;
 184         unsigned int kind;
 185         struct commit *commit;
 186 };
 187
 188 struct ref_list {
 189         struct rev_info revs;
 190         int index, alloc, maxwidth;
 191         struct ref_item *list;
 192         struct commit_list *with_commit;
 193         int kinds;
 194 };
 195
 196 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 197 {
 198         struct ref_list *ref_list = (struct ref_list*)(cb_data);
 199         struct ref_item *newitem;
 200         struct commit *commit;
 201         int kind;
 202         int len;
 203
 204         /* Detect kind */
 205         if (!prefixcmp(refname, "refs/heads/")) {
 206                 kind = REF_LOCAL_BRANCH;
 207                 refname += 11;
 208         } else if (!prefixcmp(refname, "refs/remotes/")) {
 209                 kind = REF_REMOTE_BRANCH;
 210                 refname += 13;
 211         } else
 212                 return 0;
 213
 214         commit = lookup_commit_reference_gently(sha1, 1);
 215         if (!commit)
 216                 return error("branch '%s' does not point at a commit", refname);
 217
 218         /* Filter with with_commit if specified */
 219         if (!is_descendant_of(commit, ref_list->with_commit))
 220                 return 0;
 221
 222         /* Don't add types the caller doesn't want */
 223         if ((kind & ref_list->kinds) == 0)
 224                 return 0;
 225
 226         if (merge_filter != NO_FILTER)
 227                 add_pending_object(&ref_list->revs,
 228                                    (struct object *)commit, refname);
 229
 230         /* Resize buffer */
 231         if (ref_list->index >= ref_list->alloc) {
 232                 ref_list->alloc = alloc_nr(ref_list->alloc);
 233                 ref_list->list = xrealloc(ref_list->list,
 234                                 ref_list->alloc * sizeof(struct ref_item));
 235         }
 236
 237         /* Record the new item */
 238         newitem = &(ref_list->list[ref_list->index++]);
 239         newitem->name = xstrdup(refname);
 240         newitem->kind = kind;
 241         newitem->commit = commit;
 242         len = strlen(newitem->name);
 243         if (len > ref_list->maxwidth)
 244                 ref_list->maxwidth = len;
 245
 246         return 0;
 247 }
 248
 249 static void free_ref_list(struct ref_list *ref_list)
 250 {
 251         int i;
 252
 253         for (i = 0; i < ref_list->index; i++)
 254                 free(ref_list->list[i].name);
 255         free(ref_list->list);
 256 }
 257
 258 static int ref_cmp(const void *r1, const void *r2)
 259 {
 260         struct ref_item *c1 = (struct ref_item *)(r1);
 261         struct ref_item *c2 = (struct ref_item *)(r2);
 262
 263         if (c1->kind != c2->kind)
 264                 return c1->kind - c2->kind;
 265         return strcmp(c1->name, c2->name);
 266 }
 267
 268 static void fill_tracking_info(struct strbuf *stat, const char *branch_name)
 269 {
 270         int ours, theirs;
 271         struct branch *branch = branch_get(branch_name);
 272
 273         if (!stat_tracking_info(branch, &ours, &theirs) || (!ours && !theirs))
 274                 return;
 275         if (!ours)
 276                 strbuf_addf(stat, "[behind %d] ", theirs);
 277         else if (!theirs)
 278                 strbuf_addf(stat, "[ahead %d] ", ours);
 279         else
 280                 strbuf_addf(stat, "[ahead %d, behind %d] ", ours, theirs);
 281 }
 282
 283 static int matches_merge_filter(struct commit *commit)
 284 {
 285         int is_merged;
 286
 287         if (merge_filter == NO_FILTER)
 288                 return 1;
 289
 290         is_merged = !!(commit->object.flags & UNINTERESTING);
 291         return (is_merged == (merge_filter == SHOW_MERGED));
 292 }
 293
 294 static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 295                            int abbrev, int current)
 296 {
 297         char c;
 298         int color;
 299         struct commit *commit = item->commit;
 300
 301         if (!matches_merge_filter(commit))
 302                 return;
 303
 304         switch (item->kind) {
 305         case REF_LOCAL_BRANCH:
 306                 color = COLOR_BRANCH_LOCAL;
 307                 break;
 308         case REF_REMOTE_BRANCH:
 309                 color = COLOR_BRANCH_REMOTE;
 310                 break;
 311         default:
 312                 color = COLOR_BRANCH_PLAIN;
 313                 break;
 314         }
 315
 316         c = ' ';
 317         if (current) {
 318                 c = '*';
 319                 color = COLOR_BRANCH_CURRENT;
 320         }
 321
 322         if (verbose) {
 323                 struct strbuf subject = STRBUF_INIT, stat = STRBUF_INIT;
 324                 const char *sub = " **** invalid ref ****";
 325
 326                 commit = item->commit;
 327                 if (commit && !parse_commit(commit)) {
 328                         pretty_print_commit(CMIT_FMT_ONELINE, commit,
 329                                             &subject, 0, NULL, NULL, 0, 0);
 330                         sub = subject.buf;
 331                 }
 332
 333                 if (item->kind == REF_LOCAL_BRANCH)
 334                         fill_tracking_info(&stat, item->name);
 335
 336                 printf("%c %s%-*s%s %s %s%s\n", c, branch_get_color(color),
 337                        maxwidth, item->name,
 338                        branch_get_color(COLOR_BRANCH_RESET),
 339                        find_unique_abbrev(item->commit->object.sha1, abbrev),
 340                        stat.buf, sub);
 341                 strbuf_release(&stat);
 342                 strbuf_release(&subject);
 343         } else {
 344                 printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
 345                        branch_get_color(COLOR_BRANCH_RESET));
 346         }
 347 }
 348
 349 static int calc_maxwidth(struct ref_list *refs)
 350 {
 351         int i, l, w = 0;
 352         for (i = 0; i < refs->index; i++) {
 353                 if (!matches_merge_filter(refs->list[i].commit))
 354                         continue;
 355                 l = strlen(refs->list[i].name);
 356                 if (l > w)
 357                         w = l;
 358         }
 359         return w;
 360 }
 361
 362 static void print_ref_list(int kinds, int detached, int verbose, int abbrev, struct commit_list *with_commit)
 363 {
 364         int i;
 365         struct ref_list ref_list;
 366         struct commit *head_commit = lookup_commit_reference_gently(head_sha1, 1);
 367
 368         memset(&ref_list, 0, sizeof(ref_list));
 369         ref_list.kinds = kinds;
 370         ref_list.with_commit = with_commit;
 371         if (merge_filter != NO_FILTER)
 372                 init_revisions(&ref_list.revs, NULL);
 373         for_each_ref(append_ref, &ref_list);
 374         if (merge_filter != NO_FILTER) {
 375                 struct commit *filter;
 376                 filter = lookup_commit_reference_gently(merge_filter_ref, 0);
 377                 filter->object.flags |= UNINTERESTING;
 378                 add_pending_object(&ref_list.revs,
 379                                    (struct object *) filter, "");
 380                 ref_list.revs.limited = 1;
 381                 prepare_revision_walk(&ref_list.revs);
 382                 if (verbose)
 383                         ref_list.maxwidth = calc_maxwidth(&ref_list);
 384         }
 385
 386         qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 387
 388         detached = (detached && (kinds & REF_LOCAL_BRANCH));
 389         if (detached && head_commit &&
 390             is_descendant_of(head_commit, with_commit)) {
 391                 struct ref_item item;
 392                 item.name = xstrdup("(no branch)");
 393                 item.kind = REF_LOCAL_BRANCH;
 394                 item.commit = head_commit;
 395                 if (strlen(item.name) > ref_list.maxwidth)
 396                         ref_list.maxwidth = strlen(item.name);
 397                 print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1);
 398                 free(item.name);
 399         }
 400
 401         for (i = 0; i < ref_list.index; i++) {
 402                 int current = !detached &&
 403                         (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
 404                         !strcmp(ref_list.list[i].name, head);
 405                 print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
 406                                abbrev, current);
 407         }
 408
 409         free_ref_list(&ref_list);
 410 }
 411
 412 static void rename_branch(const char *oldname, const char *newname, int force)
 413 {
 414         struct strbuf oldref = STRBUF_INIT, newref = STRBUF_INIT, logmsg = STRBUF_INIT;
 415         unsigned char sha1[20];
 416         struct strbuf oldsection = STRBUF_INIT, newsection = STRBUF_INIT;
 417
 418         if (!oldname)
 419                 die("cannot rename the current branch while not on any.");
 420
 421         strbuf_addf(&oldref, "refs/heads/%s", oldname);
 422
 423         if (check_ref_format(oldref.buf))
 424                 die("Invalid branch name: %s", oldref.buf);
 425
 426         strbuf_addf(&newref, "refs/heads/%s", newname);
 427
 428         if (check_ref_format(newref.buf))
 429                 die("Invalid branch name: %s", newref.buf);
 430
 431         if (resolve_ref(newref.buf, sha1, 1, NULL) && !force)
 432                 die("A branch named '%s' already exists.", newname);
 433
 434         strbuf_addf(&logmsg, "Branch: renamed %s to %s",
 435                  oldref.buf, newref.buf);
 436
 437         if (rename_ref(oldref.buf, newref.buf, logmsg.buf))
 438                 die("Branch rename failed");
 439         strbuf_release(&logmsg);
 440
 441         /* no need to pass logmsg here as HEAD didn't really move */
 442         if (!strcmp(oldname, head) && create_symref("HEAD", newref.buf, NULL))
 443                 die("Branch renamed to %s, but HEAD is not updated!", newname);
 444
 445         strbuf_addf(&oldsection, "branch.%s", oldref.buf + 11);
 446         strbuf_release(&oldref);
 447         strbuf_addf(&newsection, "branch.%s", newref.buf + 11);
 448         strbuf_release(&newref);
 449         if (git_config_rename_section(oldsection.buf, newsection.buf) < 0)
 450                 die("Branch is renamed, but update of config-file failed");
 451         strbuf_release(&oldsection);
 452         strbuf_release(&newsection);
 453 }
 454
 455 static int opt_parse_merge_filter(const struct option *opt, const char *arg, int unset)
 456 {
 457         merge_filter = ((opt->long_name[0] == 'n')
 458                         ? SHOW_NOT_MERGED
 459                         : SHOW_MERGED);
 460         if (unset)
 461                 merge_filter = SHOW_NOT_MERGED; /* b/c for --no-merged */
 462         if (!arg)
 463                 arg = "HEAD";
 464         if (get_sha1(arg, merge_filter_ref))
 465                 die("malformed object name %s", arg);
 466         return 0;
 467 }
 468
 469 int cmd_branch(int argc, const char **argv, const char *prefix)
 470 {
 471         int delete = 0, rename = 0, force_create = 0;
 472         int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
 473         int reflog = 0;
 474         enum branch_track track;
 475         int kinds = REF_LOCAL_BRANCH;
 476         struct commit_list *with_commit = NULL;
 477
 478         struct option options[] = {
 479                 OPT_GROUP("Generic options"),
 480                 OPT__VERBOSE(&verbose),
 481                 OPT_SET_INT( 0 , "track",  &track, "set up tracking mode (see git-pull(1))",
 482                         BRANCH_TRACK_EXPLICIT),
 483                 OPT_BOOLEAN( 0 , "color",  &branch_use_color, "use colored output"),
 484                 OPT_SET_INT('r', NULL,     &kinds, "act on remote-tracking branches",
 485                         REF_REMOTE_BRANCH),
 486                 {
 487                         OPTION_CALLBACK, 0, "contains", &with_commit, "commit",
 488                         "print only branches that contain the commit",
 489                         PARSE_OPT_LASTARG_DEFAULT,
 490                         parse_opt_with_commit, (intptr_t)"HEAD",
 491                 },
 492                 {
 493                         OPTION_CALLBACK, 0, "with", &with_commit, "commit",
 494                         "print only branches that contain the commit",
 495                         PARSE_OPT_HIDDEN | PARSE_OPT_LASTARG_DEFAULT,
 496                         parse_opt_with_commit, (intptr_t) "HEAD",
 497                 },
 498                 OPT__ABBREV(&abbrev),
 499
 500                 OPT_GROUP("Specific git-branch actions:"),
 501                 OPT_SET_INT('a', NULL, &kinds, "list both remote-tracking and local branches",
 502                         REF_REMOTE_BRANCH | REF_LOCAL_BRANCH),
 503                 OPT_BIT('d', NULL, &delete, "delete fully merged branch", 1),
 504                 OPT_BIT('D', NULL, &delete, "delete branch (even if not merged)", 2),
 505                 OPT_BIT('m', NULL, &rename, "move/rename a branch and its reflog", 1),
 506                 OPT_BIT('M', NULL, &rename, "move/rename a branch, even if target exists", 2),
 507                 OPT_BOOLEAN('l', NULL, &reflog, "create the branch's reflog"),
 508                 OPT_BOOLEAN('f', NULL, &force_create, "force creation (when already exists)"),
 509                 {
 510                         OPTION_CALLBACK, 0, "no-merged", &merge_filter_ref,
 511                         "commit", "print only not merged branches",
 512                         PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
 513                         opt_parse_merge_filter, (intptr_t) "HEAD",
 514                 },
 515                 {
 516                         OPTION_CALLBACK, 0, "merged", &merge_filter_ref,
 517                         "commit", "print only merged branches",
 518                         PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG,
 519                         opt_parse_merge_filter, (intptr_t) "HEAD",
 520                 },
 521                 OPT_END(),
 522         };
 523
 524         git_config(git_branch_config, NULL);
 525
 526         if (branch_use_color == -1)
 527                 branch_use_color = git_use_color_default;
 528
 529         track = git_branch_track;
 530
 531         head = resolve_ref("HEAD", head_sha1, 0, NULL);
 532         if (!head)
 533                 die("Failed to resolve HEAD as a valid ref.");
 534         head = xstrdup(head);
 535         if (!strcmp(head, "HEAD")) {
 536                 detached = 1;
 537         } else {
 538                 if (prefixcmp(head, "refs/heads/"))
 539                         die("HEAD not found below refs/heads!");
 540                 head += 11;
 541         }
 542         hashcpy(merge_filter_ref, head_sha1);
 543
 544         argc = parse_options(argc, argv, options, builtin_branch_usage, 0);
 545         if (!!delete + !!rename + !!force_create > 1)
 546                 usage_with_options(builtin_branch_usage, options);
 547
 548         if (delete)
 549                 return delete_branches(argc, argv, delete > 1, kinds);
 550         else if (argc == 0)
 551                 print_ref_list(kinds, detached, verbose, abbrev, with_commit);
 552         else if (rename && (argc == 1))
 553                 rename_branch(head, argv[0], rename > 1);
 554         else if (rename && (argc == 2))
 555                 rename_branch(argv[0], argv[1], rename > 1);
 556         else if (argc <= 2)
 557                 create_branch(head, argv[0], (argc == 2) ? argv[1] : head,
 558                               force_create, reflog, track);
 559         else
 560                 usage_with_options(builtin_branch_usage, options);
 561
 562         return 0;
 563 }