Andrew's git / gitweb.git / parse-options.c
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parse-options.con commit Add 'git rev-parse --show-toplevel' option. (7cceca5)
   1#include "git-compat-util.h"
   2#include "parse-options.h"
   3#include "cache.h"
   4#include "commit.h"
   5
   6#define OPT_SHORT 1
   7#define OPT_UNSET 2
   8
   9static int opterror(const struct option *opt, const char *reason, int flags)
  10{
  11        if (flags & OPT_SHORT)
  12                return error("switch `%c' %s", opt->short_name, reason);
  13        if (flags & OPT_UNSET)
  14                return error("option `no-%s' %s", opt->long_name, reason);
  15        return error("option `%s' %s", opt->long_name, reason);
  16}
  17
  18static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  19                   int flags, const char **arg)
  20{
  21        if (p->opt) {
  22                *arg = p->opt;
  23                p->opt = NULL;
  24        } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  25                *arg = (const char *)opt->defval;
  26        } else if (p->argc > 1) {
  27                p->argc--;
  28                *arg = *++p->argv;
  29        } else
  30                return opterror(opt, "requires a value", flags);
  31        return 0;
  32}
  33
  34static void fix_filename(const char *prefix, const char **file)
  35{
  36        if (!file || !*file || !prefix || is_absolute_path(*file)
  37            || !strcmp("-", *file))
  38                return;
  39        *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
  40}
  41
  42static int get_value(struct parse_opt_ctx_t *p,
  43                     const struct option *opt, int flags)
  44{
  45        const char *s, *arg;
  46        const int unset = flags & OPT_UNSET;
  47        int err;
  48
  49        if (unset && p->opt)
  50                return opterror(opt, "takes no value", flags);
  51        if (unset && (opt->flags & PARSE_OPT_NONEG))
  52                return opterror(opt, "isn't available", flags);
  53
  54        if (!(flags & OPT_SHORT) && p->opt) {
  55                switch (opt->type) {
  56                case OPTION_CALLBACK:
  57                        if (!(opt->flags & PARSE_OPT_NOARG))
  58                                break;
  59                        /* FALLTHROUGH */
  60                case OPTION_BOOLEAN:
  61                case OPTION_BIT:
  62                case OPTION_NEGBIT:
  63                case OPTION_SET_INT:
  64                case OPTION_SET_PTR:
  65                        return opterror(opt, "takes no value", flags);
  66                default:
  67                        break;
  68                }
  69        }
  70
  71        switch (opt->type) {
  72        case OPTION_BIT:
  73                if (unset)
  74                        *(int *)opt->value &= ~opt->defval;
  75                else
  76                        *(int *)opt->value |= opt->defval;
  77                return 0;
  78
  79        case OPTION_NEGBIT:
  80                if (unset)
  81                        *(int *)opt->value |= opt->defval;
  82                else
  83                        *(int *)opt->value &= ~opt->defval;
  84                return 0;
  85
  86        case OPTION_BOOLEAN:
  87                *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  88                return 0;
  89
  90        case OPTION_SET_INT:
  91                *(int *)opt->value = unset ? 0 : opt->defval;
  92                return 0;
  93
  94        case OPTION_SET_PTR:
  95                *(void **)opt->value = unset ? NULL : (void *)opt->defval;
  96                return 0;
  97
  98        case OPTION_STRING:
  99                if (unset)
 100                        *(const char **)opt->value = NULL;
 101                else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 102                        *(const char **)opt->value = (const char *)opt->defval;
 103                else
 104                        return get_arg(p, opt, flags, (const char **)opt->value);
 105                return 0;
 106
 107        case OPTION_FILENAME:
 108                err = 0;
 109                if (unset)
 110                        *(const char **)opt->value = NULL;
 111                else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 112                        *(const char **)opt->value = (const char *)opt->defval;
 113                else
 114                        err = get_arg(p, opt, flags, (const char **)opt->value);
 115
 116                if (!err)
 117                        fix_filename(p->prefix, (const char **)opt->value);
 118                return err;
 119
 120        case OPTION_CALLBACK:
 121                if (unset)
 122                        return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 123                if (opt->flags & PARSE_OPT_NOARG)
 124                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 125                if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 126                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 127                if (get_arg(p, opt, flags, &arg))
 128                        return -1;
 129                return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 130
 131        case OPTION_INTEGER:
 132                if (unset) {
 133                        *(int *)opt->value = 0;
 134                        return 0;
 135                }
 136                if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 137                        *(int *)opt->value = opt->defval;
 138                        return 0;
 139                }
 140                if (get_arg(p, opt, flags, &arg))
 141                        return -1;
 142                *(int *)opt->value = strtol(arg, (char **)&s, 10);
 143                if (*s)
 144                        return opterror(opt, "expects a numerical value", flags);
 145                return 0;
 146
 147        default:
 148                die("should not happen, someone must be hit on the forehead");
 149        }
 150}
 151
 152static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 153{
 154        const struct option *numopt = NULL;
 155
 156        for (; options->type != OPTION_END; options++) {
 157                if (options->short_name == *p->opt) {
 158                        p->opt = p->opt[1] ? p->opt + 1 : NULL;
 159                        return get_value(p, options, OPT_SHORT);
 160                }
 161
 162                /*
 163                 * Handle the numerical option later, explicit one-digit
 164                 * options take precedence over it.
 165                 */
 166                if (options->type == OPTION_NUMBER)
 167                        numopt = options;
 168        }
 169        if (numopt && isdigit(*p->opt)) {
 170                size_t len = 1;
 171                char *arg;
 172                int rc;
 173
 174                while (isdigit(p->opt[len]))
 175                        len++;
 176                arg = xmemdupz(p->opt, len);
 177                p->opt = p->opt[len] ? p->opt + len : NULL;
 178                rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 179                free(arg);
 180                return rc;
 181        }
 182        return -2;
 183}
 184
 185static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 186                          const struct option *options)
 187{
 188        const char *arg_end = strchr(arg, '=');
 189        const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 190        int abbrev_flags = 0, ambiguous_flags = 0;
 191
 192        if (!arg_end)
 193                arg_end = arg + strlen(arg);
 194
 195        for (; options->type != OPTION_END; options++) {
 196                const char *rest;
 197                int flags = 0;
 198
 199                if (!options->long_name)
 200                        continue;
 201
 202                rest = skip_prefix(arg, options->long_name);
 203                if (options->type == OPTION_ARGUMENT) {
 204                        if (!rest)
 205                                continue;
 206                        if (*rest == '=')
 207                                return opterror(options, "takes no value", flags);
 208                        if (*rest)
 209                                continue;
 210                        p->out[p->cpidx++] = arg - 2;
 211                        return 0;
 212                }
 213                if (!rest) {
 214                        /* abbreviated? */
 215                        if (!strncmp(options->long_name, arg, arg_end - arg)) {
 216is_abbreviated:
 217                                if (abbrev_option) {
 218                                        /*
 219                                         * If this is abbreviated, it is
 220                                         * ambiguous. So when there is no
 221                                         * exact match later, we need to
 222                                         * error out.
 223                                         */
 224                                        ambiguous_option = abbrev_option;
 225                                        ambiguous_flags = abbrev_flags;
 226                                }
 227                                if (!(flags & OPT_UNSET) && *arg_end)
 228                                        p->opt = arg_end + 1;
 229                                abbrev_option = options;
 230                                abbrev_flags = flags;
 231                                continue;
 232                        }
 233                        /* negation allowed? */
 234                        if (options->flags & PARSE_OPT_NONEG)
 235                                continue;
 236                        /* negated and abbreviated very much? */
 237                        if (!prefixcmp("no-", arg)) {
 238                                flags |= OPT_UNSET;
 239                                goto is_abbreviated;
 240                        }
 241                        /* negated? */
 242                        if (strncmp(arg, "no-", 3))
 243                                continue;
 244                        flags |= OPT_UNSET;
 245                        rest = skip_prefix(arg + 3, options->long_name);
 246                        /* abbreviated and negated? */
 247                        if (!rest && !prefixcmp(options->long_name, arg + 3))
 248                                goto is_abbreviated;
 249                        if (!rest)
 250                                continue;
 251                }
 252                if (*rest) {
 253                        if (*rest != '=')
 254                                continue;
 255                        p->opt = rest + 1;
 256                }
 257                return get_value(p, options, flags);
 258        }
 259
 260        if (ambiguous_option)
 261                return error("Ambiguous option: %s "
 262                        "(could be --%s%s or --%s%s)",
 263                        arg,
 264                        (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 265                        ambiguous_option->long_name,
 266                        (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 267                        abbrev_option->long_name);
 268        if (abbrev_option)
 269                return get_value(p, abbrev_option, abbrev_flags);
 270        return -2;
 271}
 272
 273static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 274                            const struct option *options)
 275{
 276        for (; options->type != OPTION_END; options++) {
 277                if (!(options->flags & PARSE_OPT_NODASH))
 278                        continue;
 279                if ((options->flags & PARSE_OPT_OPTARG) ||
 280                    !(options->flags & PARSE_OPT_NOARG))
 281                        die("BUG: dashless options don't support arguments");
 282                if (!(options->flags & PARSE_OPT_NONEG))
 283                        die("BUG: dashless options don't support negation");
 284                if (options->long_name)
 285                        die("BUG: dashless options can't be long");
 286                if (options->short_name == arg[0] && arg[1] == '\0')
 287                        return get_value(p, options, OPT_SHORT);
 288        }
 289        return -2;
 290}
 291
 292static void check_typos(const char *arg, const struct option *options)
 293{
 294        if (strlen(arg) < 3)
 295                return;
 296
 297        if (!prefixcmp(arg, "no-")) {
 298                error ("did you mean `--%s` (with two dashes ?)", arg);
 299                exit(129);
 300        }
 301
 302        for (; options->type != OPTION_END; options++) {
 303                if (!options->long_name)
 304                        continue;
 305                if (!prefixcmp(options->long_name, arg)) {
 306                        error ("did you mean `--%s` (with two dashes ?)", arg);
 307                        exit(129);
 308                }
 309        }
 310}
 311
 312static void parse_options_check(const struct option *opts)
 313{
 314        int err = 0;
 315
 316        for (; opts->type != OPTION_END; opts++) {
 317                if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 318                    (opts->flags & PARSE_OPT_OPTARG)) {
 319                        if (opts->long_name) {
 320                                error("`--%s` uses incompatible flags "
 321                                      "LASTARG_DEFAULT and OPTARG", opts->long_name);
 322                        } else {
 323                                error("`-%c` uses incompatible flags "
 324                                      "LASTARG_DEFAULT and OPTARG", opts->short_name);
 325                        }
 326                        err |= 1;
 327                }
 328        }
 329
 330        if (err)
 331                exit(129);
 332}
 333
 334void parse_options_start(struct parse_opt_ctx_t *ctx,
 335                         int argc, const char **argv, const char *prefix,
 336                         int flags)
 337{
 338        memset(ctx, 0, sizeof(*ctx));
 339        ctx->argc = argc - 1;
 340        ctx->argv = argv + 1;
 341        ctx->out  = argv;
 342        ctx->prefix = prefix;
 343        ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 344        ctx->flags = flags;
 345        if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 346            (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 347                die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 348}
 349
 350static int usage_with_options_internal(const char * const *,
 351                                       const struct option *, int);
 352
 353int parse_options_step(struct parse_opt_ctx_t *ctx,
 354                       const struct option *options,
 355                       const char * const usagestr[])
 356{
 357        int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 358
 359        parse_options_check(options);
 360
 361        /* we must reset ->opt, unknown short option leave it dangling */
 362        ctx->opt = NULL;
 363
 364        for (; ctx->argc; ctx->argc--, ctx->argv++) {
 365                const char *arg = ctx->argv[0];
 366
 367                if (*arg != '-' || !arg[1]) {
 368                        if (parse_nodash_opt(ctx, arg, options) == 0)
 369                                continue;
 370                        if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 371                                break;
 372                        ctx->out[ctx->cpidx++] = ctx->argv[0];
 373                        continue;
 374                }
 375
 376                if (arg[1] != '-') {
 377                        ctx->opt = arg + 1;
 378                        if (internal_help && *ctx->opt == 'h')
 379                                return parse_options_usage(usagestr, options);
 380                        switch (parse_short_opt(ctx, options)) {
 381                        case -1:
 382                                return parse_options_usage(usagestr, options);
 383                        case -2:
 384                                goto unknown;
 385                        }
 386                        if (ctx->opt)
 387                                check_typos(arg + 1, options);
 388                        while (ctx->opt) {
 389                                if (internal_help && *ctx->opt == 'h')
 390                                        return parse_options_usage(usagestr, options);
 391                                switch (parse_short_opt(ctx, options)) {
 392                                case -1:
 393                                        return parse_options_usage(usagestr, options);
 394                                case -2:
 395                                        /* fake a short option thing to hide the fact that we may have
 396                                         * started to parse aggregated stuff
 397                                         *
 398                                         * This is leaky, too bad.
 399                                         */
 400                                        ctx->argv[0] = xstrdup(ctx->opt - 1);
 401                                        *(char *)ctx->argv[0] = '-';
 402                                        goto unknown;
 403                                }
 404                        }
 405                        continue;
 406                }
 407
 408                if (!arg[2]) { /* "--" */
 409                        if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 410                                ctx->argc--;
 411                                ctx->argv++;
 412                        }
 413                        break;
 414                }
 415
 416                if (internal_help && !strcmp(arg + 2, "help-all"))
 417                        return usage_with_options_internal(usagestr, options, 1);
 418                if (internal_help && !strcmp(arg + 2, "help"))
 419                        return parse_options_usage(usagestr, options);
 420                switch (parse_long_opt(ctx, arg + 2, options)) {
 421                case -1:
 422                        return parse_options_usage(usagestr, options);
 423                case -2:
 424                        goto unknown;
 425                }
 426                continue;
 427unknown:
 428                if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 429                        return PARSE_OPT_UNKNOWN;
 430                ctx->out[ctx->cpidx++] = ctx->argv[0];
 431                ctx->opt = NULL;
 432        }
 433        return PARSE_OPT_DONE;
 434}
 435
 436int parse_options_end(struct parse_opt_ctx_t *ctx)
 437{
 438        memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 439        ctx->out[ctx->cpidx + ctx->argc] = NULL;
 440        return ctx->cpidx + ctx->argc;
 441}
 442
 443int parse_options(int argc, const char **argv, const char *prefix,
 444                  const struct option *options, const char * const usagestr[],
 445                  int flags)
 446{
 447        struct parse_opt_ctx_t ctx;
 448
 449        parse_options_start(&ctx, argc, argv, prefix, flags);
 450        switch (parse_options_step(&ctx, options, usagestr)) {
 451        case PARSE_OPT_HELP:
 452                exit(129);
 453        case PARSE_OPT_DONE:
 454                break;
 455        default: /* PARSE_OPT_UNKNOWN */
 456                if (ctx.argv[0][1] == '-') {
 457                        error("unknown option `%s'", ctx.argv[0] + 2);
 458                } else {
 459                        error("unknown switch `%c'", *ctx.opt);
 460                }
 461                usage_with_options(usagestr, options);
 462        }
 463
 464        return parse_options_end(&ctx);
 465}
 466
 467static int usage_argh(const struct option *opts)
 468{
 469        const char *s;
 470        int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 471        if (opts->flags & PARSE_OPT_OPTARG)
 472                if (opts->long_name)
 473                        s = literal ? "[=%s]" : "[=<%s>]";
 474                else
 475                        s = literal ? "[%s]" : "[<%s>]";
 476        else
 477                s = literal ? " %s" : " <%s>";
 478        return fprintf(stderr, s, opts->argh ? opts->argh : "...");
 479}
 480
 481#define USAGE_OPTS_WIDTH 24
 482#define USAGE_GAP         2
 483
 484static int usage_with_options_internal(const char * const *usagestr,
 485                                const struct option *opts, int full)
 486{
 487        if (!usagestr)
 488                return PARSE_OPT_HELP;
 489
 490        fprintf(stderr, "usage: %s\n", *usagestr++);
 491        while (*usagestr && **usagestr)
 492                fprintf(stderr, "   or: %s\n", *usagestr++);
 493        while (*usagestr) {
 494                fprintf(stderr, "%s%s\n",
 495                                **usagestr ? "    " : "",
 496                                *usagestr);
 497                usagestr++;
 498        }
 499
 500        if (opts->type != OPTION_GROUP)
 501                fputc('\n', stderr);
 502
 503        for (; opts->type != OPTION_END; opts++) {
 504                size_t pos;
 505                int pad;
 506
 507                if (opts->type == OPTION_GROUP) {
 508                        fputc('\n', stderr);
 509                        if (*opts->help)
 510                                fprintf(stderr, "%s\n", opts->help);
 511                        continue;
 512                }
 513                if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 514                        continue;
 515
 516                pos = fprintf(stderr, "    ");
 517                if (opts->short_name && !(opts->flags & PARSE_OPT_NEGHELP)) {
 518                        if (opts->flags & PARSE_OPT_NODASH)
 519                                pos += fprintf(stderr, "%c", opts->short_name);
 520                        else
 521                                pos += fprintf(stderr, "-%c", opts->short_name);
 522                }
 523                if (opts->long_name && opts->short_name)
 524                        pos += fprintf(stderr, ", ");
 525                if (opts->long_name)
 526                        pos += fprintf(stderr, "--%s%s",
 527                                (opts->flags & PARSE_OPT_NEGHELP) ?  "no-" : "",
 528                                opts->long_name);
 529                if (opts->type == OPTION_NUMBER)
 530                        pos += fprintf(stderr, "-NUM");
 531
 532                if (!(opts->flags & PARSE_OPT_NOARG))
 533                        pos += usage_argh(opts);
 534
 535                if (pos <= USAGE_OPTS_WIDTH)
 536                        pad = USAGE_OPTS_WIDTH - pos;
 537                else {
 538                        fputc('\n', stderr);
 539                        pad = USAGE_OPTS_WIDTH;
 540                }
 541                fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 542        }
 543        fputc('\n', stderr);
 544
 545        return PARSE_OPT_HELP;
 546}
 547
 548void usage_with_options(const char * const *usagestr,
 549                        const struct option *opts)
 550{
 551        usage_with_options_internal(usagestr, opts, 0);
 552        exit(129);
 553}
 554
 555void usage_msg_opt(const char *msg,
 556                   const char * const *usagestr,
 557                   const struct option *options)
 558{
 559        fprintf(stderr, "%s\n\n", msg);
 560        usage_with_options(usagestr, options);
 561}
 562
 563int parse_options_usage(const char * const *usagestr,
 564                        const struct option *opts)
 565{
 566        return usage_with_options_internal(usagestr, opts, 0);
 567}
 568
 569
 570/*----- some often used options -----*/
 571#include "cache.h"
 572
 573int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 574{
 575        int v;
 576
 577        if (!arg) {
 578                v = unset ? 0 : DEFAULT_ABBREV;
 579        } else {
 580                v = strtol(arg, (char **)&arg, 10);
 581                if (*arg)
 582                        return opterror(opt, "expects a numerical value", 0);
 583                if (v && v < MINIMUM_ABBREV)
 584                        v = MINIMUM_ABBREV;
 585                else if (v > 40)
 586                        v = 40;
 587        }
 588        *(int *)(opt->value) = v;
 589        return 0;
 590}
 591
 592int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
 593                             int unset)
 594{
 595        *(unsigned long *)(opt->value) = approxidate(arg);
 596        return 0;
 597}
 598
 599int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
 600                           int unset)
 601{
 602        int *target = opt->value;
 603
 604        if (unset)
 605                /* --no-quiet, --no-verbose */
 606                *target = 0;
 607        else if (opt->short_name == 'v') {
 608                if (*target >= 0)
 609                        (*target)++;
 610                else
 611                        *target = 1;
 612        } else {
 613                if (*target <= 0)
 614                        (*target)--;
 615                else
 616                        *target = -1;
 617        }
 618        return 0;
 619}
 620
 621int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
 622{
 623        unsigned char sha1[20];
 624        struct commit *commit;
 625
 626        if (!arg)
 627                return -1;
 628        if (get_sha1(arg, sha1))
 629                return error("malformed object name %s", arg);
 630        commit = lookup_commit_reference(sha1);
 631        if (!commit)
 632                return error("no such commit %s", arg);
 633        commit_list_insert(commit, opt->value);
 634        return 0;
 635}