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 output_sq;
  30
  31static 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 */
  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        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. */
 148static 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
 159static 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
 174static 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
 180static 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
 191static 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
 201static 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
 246static 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
 262static const char *skipspaces(const char *s)
 263{
 264        while (isspace(*s))
 265                s++;
 266        return s;
 267}
 268
 269static 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
 374int 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}