builtin-rev-parse.c

   1 /*
   2  * rev-parse.c
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "commit.h"
   8 #include "refs.h"
   9 #include "quote.h"
  10 #include "builtin.h"
  11 #include "parse-options.h"
  12
  13 #define DO_REVS         1
  14 #define DO_NOREV        2
  15 #define DO_FLAGS        4
  16 #define DO_NONFLAGS     8
  17 static int filter = ~0;
  18
  19 static const char *def;
  20
  21 #define NORMAL 0
  22 #define REVERSED 1
  23 static int show_type = NORMAL;
  24
  25 #define SHOW_SYMBOLIC_ASIS 1
  26 #define SHOW_SYMBOLIC_FULL 2
  27 static int symbolic;
  28 static int abbrev;
  29 static int output_sq;
  30
  31 /*
  32  * Some arguments are relevant "revision" arguments,
  33  * others are about output format or other details.
  34  * This sorts it all out.
  35  */
  36 static int is_rev_argument(const char *arg)
  37 {
  38         static const char *rev_args[] = {
  39                 "--all",
  40                 "--bisect",
  41                 "--dense",
  42                 "--branches",
  43                 "--header",
  44                 "--max-age=",
  45                 "--max-count=",
  46                 "--min-age=",
  47                 "--no-merges",
  48                 "--objects",
  49                 "--objects-edge",
  50                 "--parents",
  51                 "--pretty",
  52                 "--remotes",
  53                 "--sparse",
  54                 "--tags",
  55                 "--topo-order",
  56                 "--date-order",
  57                 "--unpacked",
  58                 NULL
  59         };
  60         const char **p = rev_args;
  61
  62         /* accept -<digit>, like traditional "head" */
  63         if ((*arg == '-') && isdigit(arg[1]))
  64                 return 1;
  65
  66         for (;;) {
  67                 const char *str = *p++;
  68                 int len;
  69                 if (!str)
  70                         return 0;
  71                 len = strlen(str);
  72                 if (!strcmp(arg, str) ||
  73                     (str[len-1] == '=' && !strncmp(arg, str, len)))
  74                         return 1;
  75         }
  76 }
  77
  78 /* Output argument as a string, either SQ or normal */
  79 static void show(const char *arg)
  80 {
  81         if (output_sq) {
  82                 int sq = '\'', ch;
  83
  84                 putchar(sq);
  85                 while ((ch = *arg++)) {
  86                         if (ch == sq)
  87                                 fputs("'\\'", stdout);
  88                         putchar(ch);
  89                 }
  90                 putchar(sq);
  91                 putchar(' ');
  92         }
  93         else
  94                 puts(arg);
  95 }
  96
  97 /* Like show(), but with a negation prefix according to type */
  98 static void show_with_type(int type, const char *arg)
  99 {
 100         if (type != show_type)
 101                 putchar('^');
 102         show(arg);
 103 }
 104
 105 /* Output a revision, only if filter allows it */
 106 static void show_rev(int type, const unsigned char *sha1, const char *name)
 107 {
 108         if (!(filter & DO_REVS))
 109                 return;
 110         def = NULL;
 111
 112         if (symbolic && name) {
 113                 if (symbolic == SHOW_SYMBOLIC_FULL) {
 114                         unsigned char discard[20];
 115                         char *full;
 116
 117                         switch (dwim_ref(name, strlen(name), discard, &full)) {
 118                         case 0:
 119                                 /*
 120                                  * Not found -- not a ref.  We could
 121                                  * emit "name" here, but symbolic-full
 122                                  * users are interested in finding the
 123                                  * refs spelled in full, and they would
 124                                  * need to filter non-refs if we did so.
 125                                  */
 126                                 break;
 127                         case 1: /* happy */
 128                                 show_with_type(type, full);
 129                                 break;
 130                         default: /* ambiguous */
 131                                 error("refname '%s' is ambiguous", name);
 132                                 break;
 133                         }
 134                 } else {
 135                         show_with_type(type, name);
 136                 }
 137         }
 138         else if (abbrev)
 139                 show_with_type(type, find_unique_abbrev(sha1, abbrev));
 140         else
 141                 show_with_type(type, sha1_to_hex(sha1));
 142 }
 143
 144 /* Output a flag, only if filter allows it. */
 145 static int show_flag(const char *arg)
 146 {
 147         if (!(filter & DO_FLAGS))
 148                 return 0;
 149         if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 150                 show(arg);
 151                 return 1;
 152         }
 153         return 0;
 154 }
 155
 156 static int show_default(void)
 157 {
 158         const char *s = def;
 159
 160         if (s) {
 161                 unsigned char sha1[20];
 162
 163                 def = NULL;
 164                 if (!get_sha1(s, sha1)) {
 165                         show_rev(NORMAL, sha1, s);
 166                         return 1;
 167                 }
 168         }
 169         return 0;
 170 }
 171
 172 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 173 {
 174         show_rev(NORMAL, sha1, refname);
 175         return 0;
 176 }
 177
 178 static void show_datestring(const char *flag, const char *datestr)
 179 {
 180         static char buffer[100];
 181
 182         /* date handling requires both flags and revs */
 183         if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 184                 return;
 185         snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 186         show(buffer);
 187 }
 188
 189 static int show_file(const char *arg)
 190 {
 191         show_default();
 192         if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 193                 show(arg);
 194                 return 1;
 195         }
 196         return 0;
 197 }
 198
 199 static int try_difference(const char *arg)
 200 {
 201         char *dotdot;
 202         unsigned char sha1[20];
 203         unsigned char end[20];
 204         const char *next;
 205         const char *this;
 206         int symmetric;
 207
 208         if (!(dotdot = strstr(arg, "..")))
 209                 return 0;
 210         next = dotdot + 2;
 211         this = arg;
 212         symmetric = (*next == '.');
 213
 214         *dotdot = 0;
 215         next += symmetric;
 216
 217         if (!*next)
 218                 next = "HEAD";
 219         if (dotdot == arg)
 220                 this = "HEAD";
 221         if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
 222                 show_rev(NORMAL, end, next);
 223                 show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 224                 if (symmetric) {
 225                         struct commit_list *exclude;
 226                         struct commit *a, *b;
 227                         a = lookup_commit_reference(sha1);
 228                         b = lookup_commit_reference(end);
 229                         exclude = get_merge_bases(a, b, 1);
 230                         while (exclude) {
 231                                 struct commit_list *n = exclude->next;
 232                                 show_rev(REVERSED,
 233                                          exclude->item->object.sha1,NULL);
 234                                 free(exclude);
 235                                 exclude = n;
 236                         }
 237                 }
 238                 return 1;
 239         }
 240         *dotdot = '.';
 241         return 0;
 242 }
 243
 244 static int parseopt_dump(const struct option *o, const char *arg, int unset)
 245 {
 246         struct strbuf *parsed = o->value;
 247         if (unset)
 248                 strbuf_addf(parsed, " --no-%s", o->long_name);
 249         else if (o->short_name)
 250                 strbuf_addf(parsed, " -%c", o->short_name);
 251         else
 252                 strbuf_addf(parsed, " --%s", o->long_name);
 253         if (arg) {
 254                 strbuf_addch(parsed, ' ');
 255                 sq_quote_buf(parsed, arg);
 256         }
 257         return 0;
 258 }
 259
 260 static const char *skipspaces(const char *s)
 261 {
 262         while (isspace(*s))
 263                 s++;
 264         return s;
 265 }
 266
 267 static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 268 {
 269         static int keep_dashdash = 0;
 270         static char const * const parseopt_usage[] = {
 271                 "git-rev-parse --parseopt [options] -- [<args>...]",
 272                 NULL
 273         };
 274         static struct option parseopt_opts[] = {
 275                 OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 276                                         "keep the `--` passed as an arg"),
 277                 OPT_END(),
 278         };
 279
 280         struct strbuf sb, parsed;
 281         const char **usage = NULL;
 282         struct option *opts = NULL;
 283         int onb = 0, osz = 0, unb = 0, usz = 0;
 284
 285         strbuf_init(&parsed, 0);
 286         strbuf_addstr(&parsed, "set --");
 287         argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
 288                              PARSE_OPT_KEEP_DASHDASH);
 289         if (argc < 1 || strcmp(argv[0], "--"))
 290                 usage_with_options(parseopt_usage, parseopt_opts);
 291
 292         strbuf_init(&sb, 0);
 293         /* get the usage up to the first line with a -- on it */
 294         for (;;) {
 295                 if (strbuf_getline(&sb, stdin, '\n') == EOF)
 296                         die("premature end of input");
 297                 ALLOC_GROW(usage, unb + 1, usz);
 298                 if (!strcmp("--", sb.buf)) {
 299                         if (unb < 1)
 300                                 die("no usage string given before the `--' separator");
 301                         usage[unb] = NULL;
 302                         break;
 303                 }
 304                 usage[unb++] = strbuf_detach(&sb, NULL);
 305         }
 306
 307         /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 308         while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 309                 const char *s;
 310                 struct option *o;
 311
 312                 if (!sb.len)
 313                         continue;
 314
 315                 ALLOC_GROW(opts, onb + 1, osz);
 316                 memset(opts + onb, 0, sizeof(opts[onb]));
 317
 318                 o = &opts[onb++];
 319                 s = strchr(sb.buf, ' ');
 320                 if (!s || *sb.buf == ' ') {
 321                         o->type = OPTION_GROUP;
 322                         o->help = xstrdup(skipspaces(sb.buf));
 323                         continue;
 324                 }
 325
 326                 o->type = OPTION_CALLBACK;
 327                 o->help = xstrdup(skipspaces(s));
 328                 o->value = &parsed;
 329                 o->flags = PARSE_OPT_NOARG;
 330                 o->callback = &parseopt_dump;
 331                 while (s > sb.buf && strchr("*=?!", s[-1])) {
 332                         switch (*--s) {
 333                         case '=':
 334                                 o->flags &= ~PARSE_OPT_NOARG;
 335                                 break;
 336                         case '?':
 337                                 o->flags &= ~PARSE_OPT_NOARG;
 338                                 o->flags |= PARSE_OPT_OPTARG;
 339                                 break;
 340                         case '!':
 341                                 o->flags |= PARSE_OPT_NONEG;
 342                                 break;
 343                         case '*':
 344                                 o->flags |= PARSE_OPT_HIDDEN;
 345                                 break;
 346                         }
 347                 }
 348
 349                 if (s - sb.buf == 1) /* short option only */
 350                         o->short_name = *sb.buf;
 351                 else if (sb.buf[1] != ',') /* long option only */
 352                         o->long_name = xmemdupz(sb.buf, s - sb.buf);
 353                 else {
 354                         o->short_name = *sb.buf;
 355                         o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 356                 }
 357         }
 358         strbuf_release(&sb);
 359
 360         /* put an OPT_END() */
 361         ALLOC_GROW(opts, onb + 1, osz);
 362         memset(opts + onb, 0, sizeof(opts[onb]));
 363         argc = parse_options(argc, argv, opts, usage,
 364                              keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
 365
 366         strbuf_addf(&parsed, " --");
 367         sq_quote_argv(&parsed, argv, 0);
 368         puts(parsed.buf);
 369         return 0;
 370 }
 371
 372 static void die_no_single_rev(int quiet)
 373 {
 374         if (quiet)
 375                 exit(1);
 376         else
 377                 die("Needed a single revision");
 378 }
 379
 380 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 381 {
 382         int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 383         unsigned char sha1[20];
 384         const char *name = NULL;
 385
 386         if (argc > 1 && !strcmp("--parseopt", argv[1]))
 387                 return cmd_parseopt(argc - 1, argv + 1, prefix);
 388
 389         prefix = setup_git_directory();
 390         git_config(git_default_config, NULL);
 391         for (i = 1; i < argc; i++) {
 392                 const char *arg = argv[i];
 393
 394                 if (as_is) {
 395                         if (show_file(arg) && as_is < 2)
 396                                 verify_filename(prefix, arg);
 397                         continue;
 398                 }
 399                 if (!strcmp(arg,"-n")) {
 400                         if (++i >= argc)
 401                                 die("-n requires an argument");
 402                         if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 403                                 show(arg);
 404                                 show(argv[i]);
 405                         }
 406                         continue;
 407                 }
 408                 if (!prefixcmp(arg, "-n")) {
 409                         if ((filter & DO_FLAGS) && (filter & DO_REVS))
 410                                 show(arg);
 411                         continue;
 412                 }
 413
 414                 if (*arg == '-') {
 415                         if (!strcmp(arg, "--")) {
 416                                 as_is = 2;
 417                                 /* Pass on the "--" if we show anything but files.. */
 418                                 if (filter & (DO_FLAGS | DO_REVS))
 419                                         show_file(arg);
 420                                 continue;
 421                         }
 422                         if (!strcmp(arg, "--default")) {
 423                                 def = argv[i+1];
 424                                 i++;
 425                                 continue;
 426                         }
 427                         if (!strcmp(arg, "--revs-only")) {
 428                                 filter &= ~DO_NOREV;
 429                                 continue;
 430                         }
 431                         if (!strcmp(arg, "--no-revs")) {
 432                                 filter &= ~DO_REVS;
 433                                 continue;
 434                         }
 435                         if (!strcmp(arg, "--flags")) {
 436                                 filter &= ~DO_NONFLAGS;
 437                                 continue;
 438                         }
 439                         if (!strcmp(arg, "--no-flags")) {
 440                                 filter &= ~DO_FLAGS;
 441                                 continue;
 442                         }
 443                         if (!strcmp(arg, "--verify")) {
 444                                 filter &= ~(DO_FLAGS|DO_NOREV);
 445                                 verify = 1;
 446                                 continue;
 447                         }
 448                         if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 449                                 quiet = 1;
 450                                 continue;
 451                         }
 452                         if (!strcmp(arg, "--short") ||
 453                             !prefixcmp(arg, "--short=")) {
 454                                 filter &= ~(DO_FLAGS|DO_NOREV);
 455                                 verify = 1;
 456                                 abbrev = DEFAULT_ABBREV;
 457                                 if (arg[7] == '=')
 458                                         abbrev = strtoul(arg + 8, NULL, 10);
 459                                 if (abbrev < MINIMUM_ABBREV)
 460                                         abbrev = MINIMUM_ABBREV;
 461                                 else if (40 <= abbrev)
 462                                         abbrev = 40;
 463                                 continue;
 464                         }
 465                         if (!strcmp(arg, "--sq")) {
 466                                 output_sq = 1;
 467                                 continue;
 468                         }
 469                         if (!strcmp(arg, "--not")) {
 470                                 show_type ^= REVERSED;
 471                                 continue;
 472                         }
 473                         if (!strcmp(arg, "--symbolic")) {
 474                                 symbolic = SHOW_SYMBOLIC_ASIS;
 475                                 continue;
 476                         }
 477                         if (!strcmp(arg, "--symbolic-full-name")) {
 478                                 symbolic = SHOW_SYMBOLIC_FULL;
 479                                 continue;
 480                         }
 481                         if (!strcmp(arg, "--all")) {
 482                                 for_each_ref(show_reference, NULL);
 483                                 continue;
 484                         }
 485                         if (!strcmp(arg, "--branches")) {
 486                                 for_each_branch_ref(show_reference, NULL);
 487                                 continue;
 488                         }
 489                         if (!strcmp(arg, "--tags")) {
 490                                 for_each_tag_ref(show_reference, NULL);
 491                                 continue;
 492                         }
 493                         if (!strcmp(arg, "--remotes")) {
 494                                 for_each_remote_ref(show_reference, NULL);
 495                                 continue;
 496                         }
 497                         if (!strcmp(arg, "--show-prefix")) {
 498                                 if (prefix)
 499                                         puts(prefix);
 500                                 continue;
 501                         }
 502                         if (!strcmp(arg, "--show-cdup")) {
 503                                 const char *pfx = prefix;
 504                                 if (!is_inside_work_tree()) {
 505                                         const char *work_tree =
 506                                                 get_git_work_tree();
 507                                         if (work_tree)
 508                                                 printf("%s\n", work_tree);
 509                                         continue;
 510                                 }
 511                                 while (pfx) {
 512                                         pfx = strchr(pfx, '/');
 513                                         if (pfx) {
 514                                                 pfx++;
 515                                                 printf("../");
 516                                         }
 517                                 }
 518                                 putchar('\n');
 519                                 continue;
 520                         }
 521                         if (!strcmp(arg, "--git-dir")) {
 522                                 const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 523                                 static char cwd[PATH_MAX];
 524                                 if (gitdir) {
 525                                         puts(gitdir);
 526                                         continue;
 527                                 }
 528                                 if (!prefix) {
 529                                         puts(".git");
 530                                         continue;
 531                                 }
 532                                 if (!getcwd(cwd, PATH_MAX))
 533                                         die("unable to get current working directory");
 534                                 printf("%s/.git\n", cwd);
 535                                 continue;
 536                         }
 537                         if (!strcmp(arg, "--is-inside-git-dir")) {
 538                                 printf("%s\n", is_inside_git_dir() ? "true"
 539                                                 : "false");
 540                                 continue;
 541                         }
 542                         if (!strcmp(arg, "--is-inside-work-tree")) {
 543                                 printf("%s\n", is_inside_work_tree() ? "true"
 544                                                 : "false");
 545                                 continue;
 546                         }
 547                         if (!strcmp(arg, "--is-bare-repository")) {
 548                                 printf("%s\n", is_bare_repository() ? "true"
 549                                                 : "false");
 550                                 continue;
 551                         }
 552                         if (!prefixcmp(arg, "--since=")) {
 553                                 show_datestring("--max-age=", arg+8);
 554                                 continue;
 555                         }
 556                         if (!prefixcmp(arg, "--after=")) {
 557                                 show_datestring("--max-age=", arg+8);
 558                                 continue;
 559                         }
 560                         if (!prefixcmp(arg, "--before=")) {
 561                                 show_datestring("--min-age=", arg+9);
 562                                 continue;
 563                         }
 564                         if (!prefixcmp(arg, "--until=")) {
 565                                 show_datestring("--min-age=", arg+8);
 566                                 continue;
 567                         }
 568                         if (show_flag(arg) && verify)
 569                                 die_no_single_rev(quiet);
 570                         continue;
 571                 }
 572
 573                 /* Not a flag argument */
 574                 if (try_difference(arg))
 575                         continue;
 576                 name = arg;
 577                 type = NORMAL;
 578                 if (*arg == '^') {
 579                         name++;
 580                         type = REVERSED;
 581                 }
 582                 if (!get_sha1(name, sha1)) {
 583                         if (verify)
 584                                 revs_count++;
 585                         else
 586                                 show_rev(type, sha1, name);
 587                         continue;
 588                 }
 589                 if (verify)
 590                         die_no_single_rev(quiet);
 591                 as_is = 1;
 592                 if (!show_file(arg))
 593                         continue;
 594                 verify_filename(prefix, arg);
 595         }
 596         if (verify) {
 597                 if (revs_count == 1) {
 598                         show_rev(type, sha1, name);
 599                         return 0;
 600                 } else if (revs_count == 0 && show_default())
 601                         return 0;
 602                 die_no_single_rev(quiet);
 603         } else
 604                 show_default();
 605         return 0;
 606 }