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
  14 static const char builtin_branch_usage[] =
  15   "git-branch [-r] (-d | -D) <branchname> | [-l] [-f] <branchname> [<start-point>] | (-m | -M) [<oldbranch>] <newbranch> | [--color | --no-color] [-r | -a] [-v [--abbrev=<length>]]";
  16
  17 #define REF_UNKNOWN_TYPE    0x00
  18 #define REF_LOCAL_BRANCH    0x01
  19 #define REF_REMOTE_BRANCH   0x02
  20 #define REF_TAG             0x04
  21
  22 static const char *head;
  23 static unsigned char head_sha1[20];
  24
  25 static int branch_use_color;
  26 static char branch_colors[][COLOR_MAXLEN] = {
  27         "\033[m",       /* reset */
  28         "",             /* PLAIN (normal) */
  29         "\033[31m",     /* REMOTE (red) */
  30         "",             /* LOCAL (normal) */
  31         "\033[32m",     /* CURRENT (green) */
  32 };
  33 enum color_branch {
  34         COLOR_BRANCH_RESET = 0,
  35         COLOR_BRANCH_PLAIN = 1,
  36         COLOR_BRANCH_REMOTE = 2,
  37         COLOR_BRANCH_LOCAL = 3,
  38         COLOR_BRANCH_CURRENT = 4,
  39 };
  40
  41 static int parse_branch_color_slot(const char *var, int ofs)
  42 {
  43         if (!strcasecmp(var+ofs, "plain"))
  44                 return COLOR_BRANCH_PLAIN;
  45         if (!strcasecmp(var+ofs, "reset"))
  46                 return COLOR_BRANCH_RESET;
  47         if (!strcasecmp(var+ofs, "remote"))
  48                 return COLOR_BRANCH_REMOTE;
  49         if (!strcasecmp(var+ofs, "local"))
  50                 return COLOR_BRANCH_LOCAL;
  51         if (!strcasecmp(var+ofs, "current"))
  52                 return COLOR_BRANCH_CURRENT;
  53         die("bad config variable '%s'", var);
  54 }
  55
  56 int git_branch_config(const char *var, const char *value)
  57 {
  58         if (!strcmp(var, "color.branch")) {
  59                 branch_use_color = git_config_colorbool(var, value);
  60                 return 0;
  61         }
  62         if (!strncmp(var, "color.branch.", 13)) {
  63                 int slot = parse_branch_color_slot(var, 13);
  64                 color_parse(value, var, branch_colors[slot]);
  65                 return 0;
  66         }
  67         return git_default_config(var, value);
  68 }
  69
  70 const char *branch_get_color(enum color_branch ix)
  71 {
  72         if (branch_use_color)
  73                 return branch_colors[ix];
  74         return "";
  75 }
  76
  77 static int delete_branches(int argc, const char **argv, int force, int kinds)
  78 {
  79         struct commit *rev, *head_rev = head_rev;
  80         unsigned char sha1[20];
  81         char *name = NULL;
  82         const char *fmt, *remote;
  83         int i;
  84         int ret = 0;
  85
  86         switch (kinds) {
  87         case REF_REMOTE_BRANCH:
  88                 fmt = "refs/remotes/%s";
  89                 remote = "remote ";
  90                 force = 1;
  91                 break;
  92         case REF_LOCAL_BRANCH:
  93                 fmt = "refs/heads/%s";
  94                 remote = "";
  95                 break;
  96         default:
  97                 die("cannot use -a with -d");
  98         }
  99
 100         if (!force) {
 101                 head_rev = lookup_commit_reference(head_sha1);
 102                 if (!head_rev)
 103                         die("Couldn't look up commit object for HEAD");
 104         }
 105         for (i = 0; i < argc; i++) {
 106                 if (kinds == REF_LOCAL_BRANCH && !strcmp(head, argv[i])) {
 107                         error("Cannot delete the branch '%s' "
 108                                 "which you are currently on.", argv[i]);
 109                         ret = 1;
 110                         continue;
 111                 }
 112
 113                 if (name)
 114                         free(name);
 115
 116                 name = xstrdup(mkpath(fmt, argv[i]));
 117                 if (!resolve_ref(name, sha1, 1, NULL)) {
 118                         error("%sbranch '%s' not found.",
 119                                         remote, argv[i]);
 120                         ret = 1;
 121                         continue;
 122                 }
 123
 124                 rev = lookup_commit_reference(sha1);
 125                 if (!rev) {
 126                         error("Couldn't look up commit object for '%s'", name);
 127                         ret = 1;
 128                         continue;
 129                 }
 130
 131                 /* This checks whether the merge bases of branch and
 132                  * HEAD contains branch -- which means that the HEAD
 133                  * contains everything in both.
 134                  */
 135
 136                 if (!force &&
 137                     !in_merge_bases(rev, head_rev)) {
 138                         error("The branch '%s' is not a strict subset of "
 139                                 "your current HEAD.\n"
 140                                 "If you are sure you want to delete it, "
 141                                 "run 'git branch -D %s'.", argv[i], argv[i]);
 142                         ret = 1;
 143                         continue;
 144                 }
 145
 146                 if (delete_ref(name, sha1)) {
 147                         error("Error deleting %sbranch '%s'", remote,
 148                                argv[i]);
 149                         ret = 1;
 150                 } else
 151                         printf("Deleted %sbranch %s.\n", remote, argv[i]);
 152
 153         }
 154
 155         if (name)
 156                 free(name);
 157
 158         return(ret);
 159 }
 160
 161 struct ref_item {
 162         char *name;
 163         unsigned int kind;
 164         unsigned char sha1[20];
 165 };
 166
 167 struct ref_list {
 168         int index, alloc, maxwidth;
 169         struct ref_item *list;
 170         int kinds;
 171 };
 172
 173 static int append_ref(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
 174 {
 175         struct ref_list *ref_list = (struct ref_list*)(cb_data);
 176         struct ref_item *newitem;
 177         int kind = REF_UNKNOWN_TYPE;
 178         int len;
 179
 180         /* Detect kind */
 181         if (!strncmp(refname, "refs/heads/", 11)) {
 182                 kind = REF_LOCAL_BRANCH;
 183                 refname += 11;
 184         } else if (!strncmp(refname, "refs/remotes/", 13)) {
 185                 kind = REF_REMOTE_BRANCH;
 186                 refname += 13;
 187         } else if (!strncmp(refname, "refs/tags/", 10)) {
 188                 kind = REF_TAG;
 189                 refname += 10;
 190         }
 191
 192         /* Don't add types the caller doesn't want */
 193         if ((kind & ref_list->kinds) == 0)
 194                 return 0;
 195
 196         /* Resize buffer */
 197         if (ref_list->index >= ref_list->alloc) {
 198                 ref_list->alloc = alloc_nr(ref_list->alloc);
 199                 ref_list->list = xrealloc(ref_list->list,
 200                                 ref_list->alloc * sizeof(struct ref_item));
 201         }
 202
 203         /* Record the new item */
 204         newitem = &(ref_list->list[ref_list->index++]);
 205         newitem->name = xstrdup(refname);
 206         newitem->kind = kind;
 207         hashcpy(newitem->sha1, sha1);
 208         len = strlen(newitem->name);
 209         if (len > ref_list->maxwidth)
 210                 ref_list->maxwidth = len;
 211
 212         return 0;
 213 }
 214
 215 static void free_ref_list(struct ref_list *ref_list)
 216 {
 217         int i;
 218
 219         for (i = 0; i < ref_list->index; i++)
 220                 free(ref_list->list[i].name);
 221         free(ref_list->list);
 222 }
 223
 224 static int ref_cmp(const void *r1, const void *r2)
 225 {
 226         struct ref_item *c1 = (struct ref_item *)(r1);
 227         struct ref_item *c2 = (struct ref_item *)(r2);
 228
 229         if (c1->kind != c2->kind)
 230                 return c1->kind - c2->kind;
 231         return strcmp(c1->name, c2->name);
 232 }
 233
 234 static void print_ref_item(struct ref_item *item, int maxwidth, int verbose,
 235                            int abbrev, int current)
 236 {
 237         char c;
 238         int color;
 239         struct commit *commit;
 240         char subject[256];
 241
 242         switch (item->kind) {
 243         case REF_LOCAL_BRANCH:
 244                 color = COLOR_BRANCH_LOCAL;
 245                 break;
 246         case REF_REMOTE_BRANCH:
 247                 color = COLOR_BRANCH_REMOTE;
 248                 break;
 249         default:
 250                 color = COLOR_BRANCH_PLAIN;
 251                 break;
 252         }
 253
 254         c = ' ';
 255         if (current) {
 256                 c = '*';
 257                 color = COLOR_BRANCH_CURRENT;
 258         }
 259
 260         if (verbose) {
 261                 commit = lookup_commit(item->sha1);
 262                 if (commit && !parse_commit(commit))
 263                         pretty_print_commit(CMIT_FMT_ONELINE, commit, ~0,
 264                                             subject, sizeof(subject), 0,
 265                                             NULL, NULL, 0);
 266                 else
 267                         strcpy(subject, " **** invalid ref ****");
 268                 printf("%c %s%-*s%s %s %s\n", c, branch_get_color(color),
 269                        maxwidth, item->name,
 270                        branch_get_color(COLOR_BRANCH_RESET),
 271                        find_unique_abbrev(item->sha1, abbrev), subject);
 272         } else {
 273                 printf("%c %s%s%s\n", c, branch_get_color(color), item->name,
 274                        branch_get_color(COLOR_BRANCH_RESET));
 275         }
 276 }
 277
 278 static void print_ref_list(int kinds, int detached, int verbose, int abbrev)
 279 {
 280         int i;
 281         struct ref_list ref_list;
 282
 283         memset(&ref_list, 0, sizeof(ref_list));
 284         ref_list.kinds = kinds;
 285         for_each_ref(append_ref, &ref_list);
 286
 287         qsort(ref_list.list, ref_list.index, sizeof(struct ref_item), ref_cmp);
 288
 289         detached = (detached && (kinds & REF_LOCAL_BRANCH));
 290         if (detached) {
 291                 struct ref_item item;
 292                 item.name = "(no branch)";
 293                 item.kind = REF_LOCAL_BRANCH;
 294                 hashcpy(item.sha1, head_sha1);
 295                 if (strlen(item.name) > ref_list.maxwidth)
 296                               ref_list.maxwidth = strlen(item.name);
 297                 print_ref_item(&item, ref_list.maxwidth, verbose, abbrev, 1);
 298         }
 299
 300         for (i = 0; i < ref_list.index; i++) {
 301                 int current = !detached &&
 302                         (ref_list.list[i].kind == REF_LOCAL_BRANCH) &&
 303                         !strcmp(ref_list.list[i].name, head);
 304                 print_ref_item(&ref_list.list[i], ref_list.maxwidth, verbose,
 305                                abbrev, current);
 306         }
 307
 308         free_ref_list(&ref_list);
 309 }
 310
 311 static void create_branch(const char *name, const char *start_name,
 312                           unsigned char *start_sha1,
 313                           int force, int reflog)
 314 {
 315         struct ref_lock *lock;
 316         struct commit *commit;
 317         unsigned char sha1[20];
 318         char ref[PATH_MAX], msg[PATH_MAX + 20];
 319         int forcing = 0;
 320
 321         snprintf(ref, sizeof ref, "refs/heads/%s", name);
 322         if (check_ref_format(ref))
 323                 die("'%s' is not a valid branch name.", name);
 324
 325         if (resolve_ref(ref, sha1, 1, NULL)) {
 326                 if (!force)
 327                         die("A branch named '%s' already exists.", name);
 328                 else if (!is_bare_repository() && !strcmp(head, name))
 329                         die("Cannot force update the current branch.");
 330                 forcing = 1;
 331         }
 332
 333         if (start_sha1)
 334                 /* detached HEAD */
 335                 hashcpy(sha1, start_sha1);
 336         else if (get_sha1(start_name, sha1))
 337                 die("Not a valid object name: '%s'.", start_name);
 338
 339         if ((commit = lookup_commit_reference(sha1)) == NULL)
 340                 die("Not a valid branch point: '%s'.", start_name);
 341         hashcpy(sha1, commit->object.sha1);
 342
 343         lock = lock_any_ref_for_update(ref, NULL);
 344         if (!lock)
 345                 die("Failed to lock ref for update: %s.", strerror(errno));
 346
 347         if (reflog)
 348                 log_all_ref_updates = 1;
 349
 350         if (forcing)
 351                 snprintf(msg, sizeof msg, "branch: Reset from %s",
 352                          start_name);
 353         else
 354                 snprintf(msg, sizeof msg, "branch: Created from %s",
 355                          start_name);
 356
 357         if (write_ref_sha1(lock, sha1, msg) < 0)
 358                 die("Failed to write ref: %s.", strerror(errno));
 359 }
 360
 361 static void rename_branch(const char *oldname, const char *newname, int force)
 362 {
 363         char oldref[PATH_MAX], newref[PATH_MAX], logmsg[PATH_MAX*2 + 100];
 364         unsigned char sha1[20];
 365
 366         if (!oldname)
 367                 die("cannot rename the current branch while not on any.");
 368
 369         if (snprintf(oldref, sizeof(oldref), "refs/heads/%s", oldname) > sizeof(oldref))
 370                 die("Old branchname too long");
 371
 372         if (check_ref_format(oldref))
 373                 die("Invalid branch name: %s", oldref);
 374
 375         if (snprintf(newref, sizeof(newref), "refs/heads/%s", newname) > sizeof(newref))
 376                 die("New branchname too long");
 377
 378         if (check_ref_format(newref))
 379                 die("Invalid branch name: %s", newref);
 380
 381         if (resolve_ref(newref, sha1, 1, NULL) && !force)
 382                 die("A branch named '%s' already exists.", newname);
 383
 384         snprintf(logmsg, sizeof(logmsg), "Branch: renamed %s to %s",
 385                  oldref, newref);
 386
 387         if (rename_ref(oldref, newref, logmsg))
 388                 die("Branch rename failed");
 389
 390         /* no need to pass logmsg here as HEAD didn't really move */
 391         if (!strcmp(oldname, head) && create_symref("HEAD", newref, NULL))
 392                 die("Branch renamed to %s, but HEAD is not updated!", newname);
 393 }
 394
 395 int cmd_branch(int argc, const char **argv, const char *prefix)
 396 {
 397         int delete = 0, force_delete = 0, force_create = 0;
 398         int rename = 0, force_rename = 0;
 399         int verbose = 0, abbrev = DEFAULT_ABBREV, detached = 0;
 400         int reflog = 0;
 401         int kinds = REF_LOCAL_BRANCH;
 402         int i;
 403
 404         git_config(git_branch_config);
 405
 406         for (i = 1; i < argc; i++) {
 407                 const char *arg = argv[i];
 408
 409                 if (arg[0] != '-')
 410                         break;
 411                 if (!strcmp(arg, "--")) {
 412                         i++;
 413                         break;
 414                 }
 415                 if (!strcmp(arg, "-d")) {
 416                         delete = 1;
 417                         continue;
 418                 }
 419                 if (!strcmp(arg, "-D")) {
 420                         delete = 1;
 421                         force_delete = 1;
 422                         continue;
 423                 }
 424                 if (!strcmp(arg, "-f")) {
 425                         force_create = 1;
 426                         continue;
 427                 }
 428                 if (!strcmp(arg, "-m")) {
 429                         rename = 1;
 430                         continue;
 431                 }
 432                 if (!strcmp(arg, "-M")) {
 433                         rename = 1;
 434                         force_rename = 1;
 435                         continue;
 436                 }
 437                 if (!strcmp(arg, "-r")) {
 438                         kinds = REF_REMOTE_BRANCH;
 439                         continue;
 440                 }
 441                 if (!strcmp(arg, "-a")) {
 442                         kinds = REF_REMOTE_BRANCH | REF_LOCAL_BRANCH;
 443                         continue;
 444                 }
 445                 if (!strcmp(arg, "-l")) {
 446                         reflog = 1;
 447                         continue;
 448                 }
 449                 if (!strncmp(arg, "--abbrev=", 9)) {
 450                         abbrev = atoi(arg+9);
 451                         continue;
 452                 }
 453                 if (!strcmp(arg, "-v")) {
 454                         verbose = 1;
 455                         continue;
 456                 }
 457                 if (!strcmp(arg, "--color")) {
 458                         branch_use_color = 1;
 459                         continue;
 460                 }
 461                 if (!strcmp(arg, "--no-color")) {
 462                         branch_use_color = 0;
 463                         continue;
 464                 }
 465                 usage(builtin_branch_usage);
 466         }
 467
 468         if ((delete && rename) || (delete && force_create) ||
 469             (rename && force_create))
 470                 usage(builtin_branch_usage);
 471
 472         head = xstrdup(resolve_ref("HEAD", head_sha1, 0, NULL));
 473         if (!head)
 474                 die("Failed to resolve HEAD as a valid ref.");
 475         if (!strcmp(head, "HEAD")) {
 476                 detached = 1;
 477         }
 478         else {
 479                 if (strncmp(head, "refs/heads/", 11))
 480                         die("HEAD not found below refs/heads!");
 481                 head += 11;
 482         }
 483
 484         if (delete)
 485                 return delete_branches(argc - i, argv + i, force_delete, kinds);
 486         else if (i == argc)
 487                 print_ref_list(kinds, detached, verbose, abbrev);
 488         else if (rename && (i == argc - 1))
 489                 rename_branch(head, argv[i], force_rename);
 490         else if (rename && (i == argc - 2))
 491                 rename_branch(argv[i], argv[i + 1], force_rename);
 492         else if (i == argc - 1)
 493                 create_branch(argv[i], head, head_sha1, force_create, reflog);
 494         else if (i == argc - 2)
 495                 create_branch(argv[i], argv[i+1], NULL, force_create, reflog);
 496         else
 497                 usage(builtin_branch_usage);
 498
 499         return 0;
 500 }