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