Andrew's git - gitweb.git/blob - 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
  17static int filter = ~0;
  18
  19static const char *def;
  20
  21#define NORMAL 0
  22#define REVERSED 1
  23static int show_type = NORMAL;
  24
  25#define SHOW_SYMBOLIC_ASIS 1
  26#define SHOW_SYMBOLIC_FULL 2
  27static int symbolic;
  28static int abbrev;
  29static int abbrev_ref;
  30static int abbrev_ref_strict;
  31static int output_sq;
  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 */
  38static 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 */
  81static 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 */
 100static 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 */
 108static void show_rev(int type, const unsigned char *sha1, const char *name)
 109{
 110        if (!(filter & DO_REVS))
 111                return;
 112        def = NULL;
 113
 114        if ((symbolic || abbrev_ref) && name) {
 115                if (symbolic == SHOW_SYMBOLIC_FULL || abbrev_ref) {
 116                        unsigned char discard[20];
 117                        char *full;
 118
 119                        switch (dwim_ref(name, strlen(name), discard, &full)) {
 120                        case 0:
 121                                /*
 122                                 * Not found -- not a ref.  We could
 123                                 * emit "name" here, but symbolic-full
 124                                 * users are interested in finding the
 125                                 * refs spelled in full, and they would
 126                                 * need to filter non-refs if we did so.
 127                                 */
 128                                break;
 129                        case 1: /* happy */
 130                                if (abbrev_ref)
 131                                        full = shorten_unambiguous_ref(full,
 132                                                abbrev_ref_strict);
 133                                show_with_type(type, full);
 134                                break;
 135                        default: /* ambiguous */
 136                                error("refname '%s' is ambiguous", name);
 137                                break;
 138                        }
 139                } else {
 140                        show_with_type(type, name);
 141                }
 142        }
 143        else if (abbrev)
 144                show_with_type(type, find_unique_abbrev(sha1, abbrev));
 145        else
 146                show_with_type(type, sha1_to_hex(sha1));
 147}
 148
 149/* Output a flag, only if filter allows it. */
 150static int show_flag(const char *arg)
 151{
 152        if (!(filter & DO_FLAGS))
 153                return 0;
 154        if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
 155                show(arg);
 156                return 1;
 157        }
 158        return 0;
 159}
 160
 161static int show_default(void)
 162{
 163        const char *s = def;
 164
 165        if (s) {
 166                unsigned char sha1[20];
 167
 168                def = NULL;
 169                if (!get_sha1(s, sha1)) {
 170                        show_rev(NORMAL, sha1, s);
 171                        return 1;
 172                }
 173        }
 174        return 0;
 175}
 176
 177static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 178{
 179        show_rev(NORMAL, sha1, refname);
 180        return 0;
 181}
 182
 183static int anti_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 184{
 185        show_rev(REVERSED, sha1, refname);
 186        return 0;
 187}
 188
 189static void show_datestring(const char *flag, const char *datestr)
 190{
 191        static char buffer[100];
 192
 193        /* date handling requires both flags and revs */
 194        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 195                return;
 196        snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 197        show(buffer);
 198}
 199
 200static int show_file(const char *arg)
 201{
 202        show_default();
 203        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 204                show(arg);
 205                return 1;
 206        }
 207        return 0;
 208}
 209
 210static int try_difference(const char *arg)
 211{
 212        char *dotdot;
 213        unsigned char sha1[20];
 214        unsigned char end[20];
 215        const char *next;
 216        const char *this;
 217        int symmetric;
 218
 219        if (!(dotdot = strstr(arg, "..")))
 220                return 0;
 221        next = dotdot + 2;
 222        this = arg;
 223        symmetric = (*next == '.');
 224
 225        *dotdot = 0;
 226        next += symmetric;
 227
 228        if (!*next)
 229                next = "HEAD";
 230        if (dotdot == arg)
 231                this = "HEAD";
 232        if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
 233                show_rev(NORMAL, end, next);
 234                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 235                if (symmetric) {
 236                        struct commit_list *exclude;
 237                        struct commit *a, *b;
 238                        a = lookup_commit_reference(sha1);
 239                        b = lookup_commit_reference(end);
 240                        exclude = get_merge_bases(a, b, 1);
 241                        while (exclude) {
 242                                struct commit_list *n = exclude->next;
 243                                show_rev(REVERSED,
 244                                         exclude->item->object.sha1,NULL);
 245                                free(exclude);
 246                                exclude = n;
 247                        }
 248                }
 249                return 1;
 250        }
 251        *dotdot = '.';
 252        return 0;
 253}
 254
 255static int try_parent_shorthands(const char *arg)
 256{
 257        char *dotdot;
 258        unsigned char sha1[20];
 259        struct commit *commit;
 260        struct commit_list *parents;
 261        int parents_only;
 262
 263        if ((dotdot = strstr(arg, "^!")))
 264                parents_only = 0;
 265        else if ((dotdot = strstr(arg, "^@")))
 266                parents_only = 1;
 267
 268        if (!dotdot || dotdot[2])
 269                return 0;
 270
 271        *dotdot = 0;
 272        if (get_sha1(arg, sha1))
 273                return 0;
 274
 275        if (!parents_only)
 276                show_rev(NORMAL, sha1, arg);
 277        commit = lookup_commit_reference(sha1);
 278        for (parents = commit->parents; parents; parents = parents->next)
 279                show_rev(parents_only ? NORMAL : REVERSED,
 280                                parents->item->object.sha1, arg);
 281
 282        return 1;
 283}
 284
 285static int parseopt_dump(const struct option *o, const char *arg, int unset)
 286{
 287        struct strbuf *parsed = o->value;
 288        if (unset)
 289                strbuf_addf(parsed, " --no-%s", o->long_name);
 290        else if (o->short_name)
 291                strbuf_addf(parsed, " -%c", o->short_name);
 292        else
 293                strbuf_addf(parsed, " --%s", o->long_name);
 294        if (arg) {
 295                strbuf_addch(parsed, ' ');
 296                sq_quote_buf(parsed, arg);
 297        }
 298        return 0;
 299}
 300
 301static const char *skipspaces(const char *s)
 302{
 303        while (isspace(*s))
 304                s++;
 305        return s;
 306}
 307
 308static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 309{
 310        static int keep_dashdash = 0, stop_at_non_option = 0;
 311        static char const * const parseopt_usage[] = {
 312                "git rev-parse --parseopt [options] -- [<args>...]",
 313                NULL
 314        };
 315        static struct option parseopt_opts[] = {
 316                OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 317                                        "keep the `--` passed as an arg"),
 318                OPT_BOOLEAN(0, "stop-at-non-option", &stop_at_non_option,
 319                                        "stop parsing after the "
 320                                        "first non-option argument"),
 321                OPT_END(),
 322        };
 323
 324        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 325        const char **usage = NULL;
 326        struct option *opts = NULL;
 327        int onb = 0, osz = 0, unb = 0, usz = 0;
 328
 329        strbuf_addstr(&parsed, "set --");
 330        argc = parse_options(argc, argv, prefix, parseopt_opts, parseopt_usage,
 331                             PARSE_OPT_KEEP_DASHDASH);
 332        if (argc < 1 || strcmp(argv[0], "--"))
 333                usage_with_options(parseopt_usage, parseopt_opts);
 334
 335        /* get the usage up to the first line with a -- on it */
 336        for (;;) {
 337                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 338                        die("premature end of input");
 339                ALLOC_GROW(usage, unb + 1, usz);
 340                if (!strcmp("--", sb.buf)) {
 341                        if (unb < 1)
 342                                die("no usage string given before the `--' separator");
 343                        usage[unb] = NULL;
 344                        break;
 345                }
 346                usage[unb++] = strbuf_detach(&sb, NULL);
 347        }
 348
 349        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 350        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 351                const char *s;
 352                struct option *o;
 353
 354                if (!sb.len)
 355                        continue;
 356
 357                ALLOC_GROW(opts, onb + 1, osz);
 358                memset(opts + onb, 0, sizeof(opts[onb]));
 359
 360                o = &opts[onb++];
 361                s = strchr(sb.buf, ' ');
 362                if (!s || *sb.buf == ' ') {
 363                        o->type = OPTION_GROUP;
 364                        o->help = xstrdup(skipspaces(sb.buf));
 365                        continue;
 366                }
 367
 368                o->type = OPTION_CALLBACK;
 369                o->help = xstrdup(skipspaces(s));
 370                o->value = &parsed;
 371                o->flags = PARSE_OPT_NOARG;
 372                o->callback = &parseopt_dump;
 373                while (s > sb.buf && strchr("*=?!", s[-1])) {
 374                        switch (*--s) {
 375                        case '=':
 376                                o->flags &= ~PARSE_OPT_NOARG;
 377                                break;
 378                        case '?':
 379                                o->flags &= ~PARSE_OPT_NOARG;
 380                                o->flags |= PARSE_OPT_OPTARG;
 381                                break;
 382                        case '!':
 383                                o->flags |= PARSE_OPT_NONEG;
 384                                break;
 385                        case '*':
 386                                o->flags |= PARSE_OPT_HIDDEN;
 387                                break;
 388                        }
 389                }
 390
 391                if (s - sb.buf == 1) /* short option only */
 392                        o->short_name = *sb.buf;
 393                else if (sb.buf[1] != ',') /* long option only */
 394                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 395                else {
 396                        o->short_name = *sb.buf;
 397                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 398                }
 399        }
 400        strbuf_release(&sb);
 401
 402        /* put an OPT_END() */
 403        ALLOC_GROW(opts, onb + 1, osz);
 404        memset(opts + onb, 0, sizeof(opts[onb]));
 405        argc = parse_options(argc, argv, prefix, opts, usage,
 406                        keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0 |
 407                        stop_at_non_option ? PARSE_OPT_STOP_AT_NON_OPTION : 0);
 408
 409        strbuf_addf(&parsed, " --");
 410        sq_quote_argv(&parsed, argv, 0);
 411        puts(parsed.buf);
 412        return 0;
 413}
 414
 415static int cmd_sq_quote(int argc, const char **argv)
 416{
 417        struct strbuf buf = STRBUF_INIT;
 418
 419        if (argc)
 420                sq_quote_argv(&buf, argv, 0);
 421        printf("%s\n", buf.buf);
 422        strbuf_release(&buf);
 423
 424        return 0;
 425}
 426
 427static void die_no_single_rev(int quiet)
 428{
 429        if (quiet)
 430                exit(1);
 431        else
 432                die("Needed a single revision");
 433}
 434
 435int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 436{
 437        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 438        unsigned char sha1[20];
 439        const char *name = NULL;
 440
 441        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 442                return cmd_parseopt(argc - 1, argv + 1, prefix);
 443
 444        if (argc > 1 && !strcmp("--sq-quote", argv[1]))
 445                return cmd_sq_quote(argc - 2, argv + 2);
 446
 447        prefix = setup_git_directory();
 448        git_config(git_default_config, NULL);
 449        for (i = 1; i < argc; i++) {
 450                const char *arg = argv[i];
 451
 452                if (as_is) {
 453                        if (show_file(arg) && as_is < 2)
 454                                verify_filename(prefix, arg);
 455                        continue;
 456                }
 457                if (!strcmp(arg,"-n")) {
 458                        if (++i >= argc)
 459                                die("-n requires an argument");
 460                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 461                                show(arg);
 462                                show(argv[i]);
 463                        }
 464                        continue;
 465                }
 466                if (!prefixcmp(arg, "-n")) {
 467                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 468                                show(arg);
 469                        continue;
 470                }
 471
 472                if (*arg == '-') {
 473                        if (!strcmp(arg, "--")) {
 474                                as_is = 2;
 475                                /* Pass on the "--" if we show anything but files.. */
 476                                if (filter & (DO_FLAGS | DO_REVS))
 477                                        show_file(arg);
 478                                continue;
 479                        }
 480                        if (!strcmp(arg, "--default")) {
 481                                def = argv[i+1];
 482                                i++;
 483                                continue;
 484                        }
 485                        if (!strcmp(arg, "--revs-only")) {
 486                                filter &= ~DO_NOREV;
 487                                continue;
 488                        }
 489                        if (!strcmp(arg, "--no-revs")) {
 490                                filter &= ~DO_REVS;
 491                                continue;
 492                        }
 493                        if (!strcmp(arg, "--flags")) {
 494                                filter &= ~DO_NONFLAGS;
 495                                continue;
 496                        }
 497                        if (!strcmp(arg, "--no-flags")) {
 498                                filter &= ~DO_FLAGS;
 499                                continue;
 500                        }
 501                        if (!strcmp(arg, "--verify")) {
 502                                filter &= ~(DO_FLAGS|DO_NOREV);
 503                                verify = 1;
 504                                continue;
 505                        }
 506                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 507                                quiet = 1;
 508                                continue;
 509                        }
 510                        if (!strcmp(arg, "--short") ||
 511                            !prefixcmp(arg, "--short=")) {
 512                                filter &= ~(DO_FLAGS|DO_NOREV);
 513                                verify = 1;
 514                                abbrev = DEFAULT_ABBREV;
 515                                if (arg[7] == '=')
 516                                        abbrev = strtoul(arg + 8, NULL, 10);
 517                                if (abbrev < MINIMUM_ABBREV)
 518                                        abbrev = MINIMUM_ABBREV;
 519                                else if (40 <= abbrev)
 520                                        abbrev = 40;
 521                                continue;
 522                        }
 523                        if (!strcmp(arg, "--sq")) {
 524                                output_sq = 1;
 525                                continue;
 526                        }
 527                        if (!strcmp(arg, "--not")) {
 528                                show_type ^= REVERSED;
 529                                continue;
 530                        }
 531                        if (!strcmp(arg, "--symbolic")) {
 532                                symbolic = SHOW_SYMBOLIC_ASIS;
 533                                continue;
 534                        }
 535                        if (!strcmp(arg, "--symbolic-full-name")) {
 536                                symbolic = SHOW_SYMBOLIC_FULL;
 537                                continue;
 538                        }
 539                        if (!prefixcmp(arg, "--abbrev-ref") &&
 540                            (!arg[12] || arg[12] == '=')) {
 541                                abbrev_ref = 1;
 542                                abbrev_ref_strict = warn_ambiguous_refs;
 543                                if (arg[12] == '=') {
 544                                        if (!strcmp(arg + 13, "strict"))
 545                                                abbrev_ref_strict = 1;
 546                                        else if (!strcmp(arg + 13, "loose"))
 547                                                abbrev_ref_strict = 0;
 548                                        else
 549                                                die("unknown mode for %s", arg);
 550                                }
 551                                continue;
 552                        }
 553                        if (!strcmp(arg, "--all")) {
 554                                for_each_ref(show_reference, NULL);
 555                                continue;
 556                        }
 557                        if (!strcmp(arg, "--bisect")) {
 558                                for_each_ref_in("refs/bisect/bad", show_reference, NULL);
 559                                for_each_ref_in("refs/bisect/good", anti_reference, NULL);
 560                                continue;
 561                        }
 562                        if (!strcmp(arg, "--branches")) {
 563                                for_each_branch_ref(show_reference, NULL);
 564                                continue;
 565                        }
 566                        if (!strcmp(arg, "--tags")) {
 567                                for_each_tag_ref(show_reference, NULL);
 568                                continue;
 569                        }
 570                        if (!strcmp(arg, "--remotes")) {
 571                                for_each_remote_ref(show_reference, NULL);
 572                                continue;
 573                        }
 574                        if (!strcmp(arg, "--show-prefix")) {
 575                                if (prefix)
 576                                        puts(prefix);
 577                                continue;
 578                        }
 579                        if (!strcmp(arg, "--show-cdup")) {
 580                                const char *pfx = prefix;
 581                                if (!is_inside_work_tree()) {
 582                                        const char *work_tree =
 583                                                get_git_work_tree();
 584                                        if (work_tree)
 585                                                printf("%s\n", work_tree);
 586                                        continue;
 587                                }
 588                                while (pfx) {
 589                                        pfx = strchr(pfx, '/');
 590                                        if (pfx) {
 591                                                pfx++;
 592                                                printf("../");
 593                                        }
 594                                }
 595                                putchar('\n');
 596                                continue;
 597                        }
 598                        if (!strcmp(arg, "--git-dir")) {
 599                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 600                                static char cwd[PATH_MAX];
 601                                if (gitdir) {
 602                                        puts(gitdir);
 603                                        continue;
 604                                }
 605                                if (!prefix) {
 606                                        puts(".git");
 607                                        continue;
 608                                }
 609                                if (!getcwd(cwd, PATH_MAX))
 610                                        die_errno("unable to get current working directory");
 611                                printf("%s/.git\n", cwd);
 612                                continue;
 613                        }
 614                        if (!strcmp(arg, "--is-inside-git-dir")) {
 615                                printf("%s\n", is_inside_git_dir() ? "true"
 616                                                : "false");
 617                                continue;
 618                        }
 619                        if (!strcmp(arg, "--is-inside-work-tree")) {
 620                                printf("%s\n", is_inside_work_tree() ? "true"
 621                                                : "false");
 622                                continue;
 623                        }
 624                        if (!strcmp(arg, "--is-bare-repository")) {
 625                                printf("%s\n", is_bare_repository() ? "true"
 626                                                : "false");
 627                                continue;
 628                        }
 629                        if (!prefixcmp(arg, "--since=")) {
 630                                show_datestring("--max-age=", arg+8);
 631                                continue;
 632                        }
 633                        if (!prefixcmp(arg, "--after=")) {
 634                                show_datestring("--max-age=", arg+8);
 635                                continue;
 636                        }
 637                        if (!prefixcmp(arg, "--before=")) {
 638                                show_datestring("--min-age=", arg+9);
 639                                continue;
 640                        }
 641                        if (!prefixcmp(arg, "--until=")) {
 642                                show_datestring("--min-age=", arg+8);
 643                                continue;
 644                        }
 645                        if (show_flag(arg) && verify)
 646                                die_no_single_rev(quiet);
 647                        continue;
 648                }
 649
 650                /* Not a flag argument */
 651                if (try_difference(arg))
 652                        continue;
 653                if (try_parent_shorthands(arg))
 654                        continue;
 655                name = arg;
 656                type = NORMAL;
 657                if (*arg == '^') {
 658                        name++;
 659                        type = REVERSED;
 660                }
 661                if (!get_sha1(name, sha1)) {
 662                        if (verify)
 663                                revs_count++;
 664                        else
 665                                show_rev(type, sha1, name);
 666                        continue;
 667                }
 668                if (verify)
 669                        die_no_single_rev(quiet);
 670                as_is = 1;
 671                if (!show_file(arg))
 672                        continue;
 673                verify_filename(prefix, arg);
 674        }
 675        if (verify) {
 676                if (revs_count == 1) {
 677                        show_rev(type, sha1, name);
 678                        return 0;
 679                } else if (revs_count == 0 && show_default())
 680                        return 0;
 681                die_no_single_rev(quiet);
 682        } else
 683                show_default();
 684        return 0;
 685}