Andrew's git / gitweb.git / builtin-rev-parse.c
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builtin-rev-parse.con commit for-each-ref: Do not lookup objects when they will not be used (b7dd2d2)
   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 void show_datestring(const char *flag, const char *datestr)
 184{
 185        static char buffer[100];
 186
 187        /* date handling requires both flags and revs */
 188        if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
 189                return;
 190        snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
 191        show(buffer);
 192}
 193
 194static int show_file(const char *arg)
 195{
 196        show_default();
 197        if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
 198                show(arg);
 199                return 1;
 200        }
 201        return 0;
 202}
 203
 204static int try_difference(const char *arg)
 205{
 206        char *dotdot;
 207        unsigned char sha1[20];
 208        unsigned char end[20];
 209        const char *next;
 210        const char *this;
 211        int symmetric;
 212
 213        if (!(dotdot = strstr(arg, "..")))
 214                return 0;
 215        next = dotdot + 2;
 216        this = arg;
 217        symmetric = (*next == '.');
 218
 219        *dotdot = 0;
 220        next += symmetric;
 221
 222        if (!*next)
 223                next = "HEAD";
 224        if (dotdot == arg)
 225                this = "HEAD";
 226        if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
 227                show_rev(NORMAL, end, next);
 228                show_rev(symmetric ? NORMAL : REVERSED, sha1, this);
 229                if (symmetric) {
 230                        struct commit_list *exclude;
 231                        struct commit *a, *b;
 232                        a = lookup_commit_reference(sha1);
 233                        b = lookup_commit_reference(end);
 234                        exclude = get_merge_bases(a, b, 1);
 235                        while (exclude) {
 236                                struct commit_list *n = exclude->next;
 237                                show_rev(REVERSED,
 238                                         exclude->item->object.sha1,NULL);
 239                                free(exclude);
 240                                exclude = n;
 241                        }
 242                }
 243                return 1;
 244        }
 245        *dotdot = '.';
 246        return 0;
 247}
 248
 249static int try_parent_shorthands(const char *arg)
 250{
 251        char *dotdot;
 252        unsigned char sha1[20];
 253        struct commit *commit;
 254        struct commit_list *parents;
 255        int parents_only;
 256
 257        if ((dotdot = strstr(arg, "^!")))
 258                parents_only = 0;
 259        else if ((dotdot = strstr(arg, "^@")))
 260                parents_only = 1;
 261
 262        if (!dotdot || dotdot[2])
 263                return 0;
 264
 265        *dotdot = 0;
 266        if (get_sha1(arg, sha1))
 267                return 0;
 268
 269        if (!parents_only)
 270                show_rev(NORMAL, sha1, arg);
 271        commit = lookup_commit_reference(sha1);
 272        for (parents = commit->parents; parents; parents = parents->next)
 273                show_rev(parents_only ? NORMAL : REVERSED,
 274                                parents->item->object.sha1, arg);
 275
 276        return 1;
 277}
 278
 279static int parseopt_dump(const struct option *o, const char *arg, int unset)
 280{
 281        struct strbuf *parsed = o->value;
 282        if (unset)
 283                strbuf_addf(parsed, " --no-%s", o->long_name);
 284        else if (o->short_name)
 285                strbuf_addf(parsed, " -%c", o->short_name);
 286        else
 287                strbuf_addf(parsed, " --%s", o->long_name);
 288        if (arg) {
 289                strbuf_addch(parsed, ' ');
 290                sq_quote_buf(parsed, arg);
 291        }
 292        return 0;
 293}
 294
 295static const char *skipspaces(const char *s)
 296{
 297        while (isspace(*s))
 298                s++;
 299        return s;
 300}
 301
 302static int cmd_parseopt(int argc, const char **argv, const char *prefix)
 303{
 304        static int keep_dashdash = 0;
 305        static char const * const parseopt_usage[] = {
 306                "git rev-parse --parseopt [options] -- [<args>...]",
 307                NULL
 308        };
 309        static struct option parseopt_opts[] = {
 310                OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
 311                                        "keep the `--` passed as an arg"),
 312                OPT_END(),
 313        };
 314
 315        struct strbuf sb = STRBUF_INIT, parsed = STRBUF_INIT;
 316        const char **usage = NULL;
 317        struct option *opts = NULL;
 318        int onb = 0, osz = 0, unb = 0, usz = 0;
 319
 320        strbuf_addstr(&parsed, "set --");
 321        argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
 322                             PARSE_OPT_KEEP_DASHDASH);
 323        if (argc < 1 || strcmp(argv[0], "--"))
 324                usage_with_options(parseopt_usage, parseopt_opts);
 325
 326        /* get the usage up to the first line with a -- on it */
 327        for (;;) {
 328                if (strbuf_getline(&sb, stdin, '\n') == EOF)
 329                        die("premature end of input");
 330                ALLOC_GROW(usage, unb + 1, usz);
 331                if (!strcmp("--", sb.buf)) {
 332                        if (unb < 1)
 333                                die("no usage string given before the `--' separator");
 334                        usage[unb] = NULL;
 335                        break;
 336                }
 337                usage[unb++] = strbuf_detach(&sb, NULL);
 338        }
 339
 340        /* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
 341        while (strbuf_getline(&sb, stdin, '\n') != EOF) {
 342                const char *s;
 343                struct option *o;
 344
 345                if (!sb.len)
 346                        continue;
 347
 348                ALLOC_GROW(opts, onb + 1, osz);
 349                memset(opts + onb, 0, sizeof(opts[onb]));
 350
 351                o = &opts[onb++];
 352                s = strchr(sb.buf, ' ');
 353                if (!s || *sb.buf == ' ') {
 354                        o->type = OPTION_GROUP;
 355                        o->help = xstrdup(skipspaces(sb.buf));
 356                        continue;
 357                }
 358
 359                o->type = OPTION_CALLBACK;
 360                o->help = xstrdup(skipspaces(s));
 361                o->value = &parsed;
 362                o->flags = PARSE_OPT_NOARG;
 363                o->callback = &parseopt_dump;
 364                while (s > sb.buf && strchr("*=?!", s[-1])) {
 365                        switch (*--s) {
 366                        case '=':
 367                                o->flags &= ~PARSE_OPT_NOARG;
 368                                break;
 369                        case '?':
 370                                o->flags &= ~PARSE_OPT_NOARG;
 371                                o->flags |= PARSE_OPT_OPTARG;
 372                                break;
 373                        case '!':
 374                                o->flags |= PARSE_OPT_NONEG;
 375                                break;
 376                        case '*':
 377                                o->flags |= PARSE_OPT_HIDDEN;
 378                                break;
 379                        }
 380                }
 381
 382                if (s - sb.buf == 1) /* short option only */
 383                        o->short_name = *sb.buf;
 384                else if (sb.buf[1] != ',') /* long option only */
 385                        o->long_name = xmemdupz(sb.buf, s - sb.buf);
 386                else {
 387                        o->short_name = *sb.buf;
 388                        o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
 389                }
 390        }
 391        strbuf_release(&sb);
 392
 393        /* put an OPT_END() */
 394        ALLOC_GROW(opts, onb + 1, osz);
 395        memset(opts + onb, 0, sizeof(opts[onb]));
 396        argc = parse_options(argc, argv, opts, usage,
 397                             keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
 398
 399        strbuf_addf(&parsed, " --");
 400        sq_quote_argv(&parsed, argv, 0);
 401        puts(parsed.buf);
 402        return 0;
 403}
 404
 405static void die_no_single_rev(int quiet)
 406{
 407        if (quiet)
 408                exit(1);
 409        else
 410                die("Needed a single revision");
 411}
 412
 413int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 414{
 415        int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 416        unsigned char sha1[20];
 417        const char *name = NULL;
 418
 419        if (argc > 1 && !strcmp("--parseopt", argv[1]))
 420                return cmd_parseopt(argc - 1, argv + 1, prefix);
 421
 422        prefix = setup_git_directory();
 423        git_config(git_default_config, NULL);
 424        for (i = 1; i < argc; i++) {
 425                const char *arg = argv[i];
 426
 427                if (as_is) {
 428                        if (show_file(arg) && as_is < 2)
 429                                verify_filename(prefix, arg);
 430                        continue;
 431                }
 432                if (!strcmp(arg,"-n")) {
 433                        if (++i >= argc)
 434                                die("-n requires an argument");
 435                        if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
 436                                show(arg);
 437                                show(argv[i]);
 438                        }
 439                        continue;
 440                }
 441                if (!prefixcmp(arg, "-n")) {
 442                        if ((filter & DO_FLAGS) && (filter & DO_REVS))
 443                                show(arg);
 444                        continue;
 445                }
 446
 447                if (*arg == '-') {
 448                        if (!strcmp(arg, "--")) {
 449                                as_is = 2;
 450                                /* Pass on the "--" if we show anything but files.. */
 451                                if (filter & (DO_FLAGS | DO_REVS))
 452                                        show_file(arg);
 453                                continue;
 454                        }
 455                        if (!strcmp(arg, "--default")) {
 456                                def = argv[i+1];
 457                                i++;
 458                                continue;
 459                        }
 460                        if (!strcmp(arg, "--revs-only")) {
 461                                filter &= ~DO_NOREV;
 462                                continue;
 463                        }
 464                        if (!strcmp(arg, "--no-revs")) {
 465                                filter &= ~DO_REVS;
 466                                continue;
 467                        }
 468                        if (!strcmp(arg, "--flags")) {
 469                                filter &= ~DO_NONFLAGS;
 470                                continue;
 471                        }
 472                        if (!strcmp(arg, "--no-flags")) {
 473                                filter &= ~DO_FLAGS;
 474                                continue;
 475                        }
 476                        if (!strcmp(arg, "--verify")) {
 477                                filter &= ~(DO_FLAGS|DO_NOREV);
 478                                verify = 1;
 479                                continue;
 480                        }
 481                        if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 482                                quiet = 1;
 483                                continue;
 484                        }
 485                        if (!strcmp(arg, "--short") ||
 486                            !prefixcmp(arg, "--short=")) {
 487                                filter &= ~(DO_FLAGS|DO_NOREV);
 488                                verify = 1;
 489                                abbrev = DEFAULT_ABBREV;
 490                                if (arg[7] == '=')
 491                                        abbrev = strtoul(arg + 8, NULL, 10);
 492                                if (abbrev < MINIMUM_ABBREV)
 493                                        abbrev = MINIMUM_ABBREV;
 494                                else if (40 <= abbrev)
 495                                        abbrev = 40;
 496                                continue;
 497                        }
 498                        if (!strcmp(arg, "--sq")) {
 499                                output_sq = 1;
 500                                continue;
 501                        }
 502                        if (!strcmp(arg, "--not")) {
 503                                show_type ^= REVERSED;
 504                                continue;
 505                        }
 506                        if (!strcmp(arg, "--symbolic")) {
 507                                symbolic = SHOW_SYMBOLIC_ASIS;
 508                                continue;
 509                        }
 510                        if (!strcmp(arg, "--symbolic-full-name")) {
 511                                symbolic = SHOW_SYMBOLIC_FULL;
 512                                continue;
 513                        }
 514                        if (!prefixcmp(arg, "--abbrev-ref") &&
 515                            (!arg[12] || arg[12] == '=')) {
 516                                abbrev_ref = 1;
 517                                abbrev_ref_strict = warn_ambiguous_refs;
 518                                if (arg[12] == '=') {
 519                                        if (!strcmp(arg + 13, "strict"))
 520                                                abbrev_ref_strict = 1;
 521                                        else if (!strcmp(arg + 13, "loose"))
 522                                                abbrev_ref_strict = 0;
 523                                        else
 524                                                die("unknown mode for %s", arg);
 525                                }
 526                                continue;
 527                        }
 528                        if (!strcmp(arg, "--all")) {
 529                                for_each_ref(show_reference, NULL);
 530                                continue;
 531                        }
 532                        if (!strcmp(arg, "--branches")) {
 533                                for_each_branch_ref(show_reference, NULL);
 534                                continue;
 535                        }
 536                        if (!strcmp(arg, "--tags")) {
 537                                for_each_tag_ref(show_reference, NULL);
 538                                continue;
 539                        }
 540                        if (!strcmp(arg, "--remotes")) {
 541                                for_each_remote_ref(show_reference, NULL);
 542                                continue;
 543                        }
 544                        if (!strcmp(arg, "--show-prefix")) {
 545                                if (prefix)
 546                                        puts(prefix);
 547                                continue;
 548                        }
 549                        if (!strcmp(arg, "--show-cdup")) {
 550                                const char *pfx = prefix;
 551                                if (!is_inside_work_tree()) {
 552                                        const char *work_tree =
 553                                                get_git_work_tree();
 554                                        if (work_tree)
 555                                                printf("%s\n", work_tree);
 556                                        continue;
 557                                }
 558                                while (pfx) {
 559                                        pfx = strchr(pfx, '/');
 560                                        if (pfx) {
 561                                                pfx++;
 562                                                printf("../");
 563                                        }
 564                                }
 565                                putchar('\n');
 566                                continue;
 567                        }
 568                        if (!strcmp(arg, "--git-dir")) {
 569                                const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
 570                                static char cwd[PATH_MAX];
 571                                if (gitdir) {
 572                                        puts(gitdir);
 573                                        continue;
 574                                }
 575                                if (!prefix) {
 576                                        puts(".git");
 577                                        continue;
 578                                }
 579                                if (!getcwd(cwd, PATH_MAX))
 580                                        die("unable to get current working directory");
 581                                printf("%s/.git\n", cwd);
 582                                continue;
 583                        }
 584                        if (!strcmp(arg, "--is-inside-git-dir")) {
 585                                printf("%s\n", is_inside_git_dir() ? "true"
 586                                                : "false");
 587                                continue;
 588                        }
 589                        if (!strcmp(arg, "--is-inside-work-tree")) {
 590                                printf("%s\n", is_inside_work_tree() ? "true"
 591                                                : "false");
 592                                continue;
 593                        }
 594                        if (!strcmp(arg, "--is-bare-repository")) {
 595                                printf("%s\n", is_bare_repository() ? "true"
 596                                                : "false");
 597                                continue;
 598                        }
 599                        if (!prefixcmp(arg, "--since=")) {
 600                                show_datestring("--max-age=", arg+8);
 601                                continue;
 602                        }
 603                        if (!prefixcmp(arg, "--after=")) {
 604                                show_datestring("--max-age=", arg+8);
 605                                continue;
 606                        }
 607                        if (!prefixcmp(arg, "--before=")) {
 608                                show_datestring("--min-age=", arg+9);
 609                                continue;
 610                        }
 611                        if (!prefixcmp(arg, "--until=")) {
 612                                show_datestring("--min-age=", arg+8);
 613                                continue;
 614                        }
 615                        if (show_flag(arg) && verify)
 616                                die_no_single_rev(quiet);
 617                        continue;
 618                }
 619
 620                /* Not a flag argument */
 621                if (try_difference(arg))
 622                        continue;
 623                if (try_parent_shorthands(arg))
 624                        continue;
 625                name = arg;
 626                type = NORMAL;
 627                if (*arg == '^') {
 628                        name++;
 629                        type = REVERSED;
 630                }
 631                if (!get_sha1(name, sha1)) {
 632                        if (verify)
 633                                revs_count++;
 634                        else
 635                                show_rev(type, sha1, name);
 636                        continue;
 637                }
 638                if (verify)
 639                        die_no_single_rev(quiet);
 640                as_is = 1;
 641                if (!show_file(arg))
 642                        continue;
 643                verify_filename(prefix, arg);
 644        }
 645        if (verify) {
 646                if (revs_count == 1) {
 647                        show_rev(type, sha1, name);
 648                        return 0;
 649                } else if (revs_count == 0 && show_default())
 650                        return 0;
 651                die_no_single_rev(quiet);
 652        } else
 653                show_default();
 654        return 0;
 655}