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