Andrew's git / gitweb.git / parse-options.c
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parse-options.con commit Merge branch 'jc/maint-mailinfo-mime-attr' (b1bb02d)
   1#include "git-compat-util.h"
   2#include "parse-options.h"
   3#include "cache.h"
   4#include "commit.h"
   5#include "color.h"
   6
   7static int parse_options_usage(struct parse_opt_ctx_t *ctx,
   8                               const char * const *usagestr,
   9                               const struct option *opts, int err);
  10
  11#define OPT_SHORT 1
  12#define OPT_UNSET 2
  13
  14int optbug(const struct option *opt, const char *reason)
  15{
  16        if (opt->long_name)
  17                return error("BUG: option '%s' %s", opt->long_name, reason);
  18        return error("BUG: switch '%c' %s", opt->short_name, reason);
  19}
  20
  21int opterror(const struct option *opt, const char *reason, int flags)
  22{
  23        if (flags & OPT_SHORT)
  24                return error("switch `%c' %s", opt->short_name, reason);
  25        if (flags & OPT_UNSET)
  26                return error("option `no-%s' %s", opt->long_name, reason);
  27        return error("option `%s' %s", opt->long_name, reason);
  28}
  29
  30static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  31                   int flags, const char **arg)
  32{
  33        if (p->opt) {
  34                *arg = p->opt;
  35                p->opt = NULL;
  36        } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  37                *arg = (const char *)opt->defval;
  38        } else if (p->argc > 1) {
  39                p->argc--;
  40                *arg = *++p->argv;
  41        } else
  42                return opterror(opt, "requires a value", flags);
  43        return 0;
  44}
  45
  46static void fix_filename(const char *prefix, const char **file)
  47{
  48        if (!file || !*file || !prefix || is_absolute_path(*file)
  49            || !strcmp("-", *file))
  50                return;
  51        *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
  52}
  53
  54static int get_value(struct parse_opt_ctx_t *p,
  55                     const struct option *opt, int flags)
  56{
  57        const char *s, *arg;
  58        const int unset = flags & OPT_UNSET;
  59        int err;
  60
  61        if (unset && p->opt)
  62                return opterror(opt, "takes no value", flags);
  63        if (unset && (opt->flags & PARSE_OPT_NONEG))
  64                return opterror(opt, "isn't available", flags);
  65        if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
  66                return opterror(opt, "takes no value", flags);
  67
  68        switch (opt->type) {
  69        case OPTION_LOWLEVEL_CALLBACK:
  70                return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
  71
  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_COUNTUP:
  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, *long_name = options->long_name;
 197                int flags = 0, opt_flags = 0;
 198
 199                if (!long_name)
 200                        continue;
 201
 202again:
 203                rest = skip_prefix(arg, long_name);
 204                if (options->type == OPTION_ARGUMENT) {
 205                        if (!rest)
 206                                continue;
 207                        if (*rest == '=')
 208                                return opterror(options, "takes no value", flags);
 209                        if (*rest)
 210                                continue;
 211                        p->out[p->cpidx++] = arg - 2;
 212                        return 0;
 213                }
 214                if (!rest) {
 215                        /* abbreviated? */
 216                        if (!strncmp(long_name, arg, arg_end - arg)) {
 217is_abbreviated:
 218                                if (abbrev_option) {
 219                                        /*
 220                                         * If this is abbreviated, it is
 221                                         * ambiguous. So when there is no
 222                                         * exact match later, we need to
 223                                         * error out.
 224                                         */
 225                                        ambiguous_option = abbrev_option;
 226                                        ambiguous_flags = abbrev_flags;
 227                                }
 228                                if (!(flags & OPT_UNSET) && *arg_end)
 229                                        p->opt = arg_end + 1;
 230                                abbrev_option = options;
 231                                abbrev_flags = flags ^ opt_flags;
 232                                continue;
 233                        }
 234                        /* negation allowed? */
 235                        if (options->flags & PARSE_OPT_NONEG)
 236                                continue;
 237                        /* negated and abbreviated very much? */
 238                        if (!prefixcmp("no-", arg)) {
 239                                flags |= OPT_UNSET;
 240                                goto is_abbreviated;
 241                        }
 242                        /* negated? */
 243                        if (prefixcmp(arg, "no-")) {
 244                                if (!prefixcmp(long_name, "no-")) {
 245                                        long_name += 3;
 246                                        opt_flags |= OPT_UNSET;
 247                                        goto again;
 248                                }
 249                                continue;
 250                        }
 251                        flags |= OPT_UNSET;
 252                        rest = skip_prefix(arg + 3, long_name);
 253                        /* abbreviated and negated? */
 254                        if (!rest && !prefixcmp(long_name, arg + 3))
 255                                goto is_abbreviated;
 256                        if (!rest)
 257                                continue;
 258                }
 259                if (*rest) {
 260                        if (*rest != '=')
 261                                continue;
 262                        p->opt = rest + 1;
 263                }
 264                return get_value(p, options, flags ^ opt_flags);
 265        }
 266
 267        if (ambiguous_option)
 268                return error("Ambiguous option: %s "
 269                        "(could be --%s%s or --%s%s)",
 270                        arg,
 271                        (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 272                        ambiguous_option->long_name,
 273                        (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 274                        abbrev_option->long_name);
 275        if (abbrev_option)
 276                return get_value(p, abbrev_option, abbrev_flags);
 277        return -2;
 278}
 279
 280static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 281                            const struct option *options)
 282{
 283        for (; options->type != OPTION_END; options++) {
 284                if (!(options->flags & PARSE_OPT_NODASH))
 285                        continue;
 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                        err |= optbug(opts, "uses incompatible flags "
 320                                        "LASTARG_DEFAULT and OPTARG");
 321                if (opts->flags & PARSE_OPT_NODASH &&
 322                    ((opts->flags & PARSE_OPT_OPTARG) ||
 323                     !(opts->flags & PARSE_OPT_NOARG) ||
 324                     !(opts->flags & PARSE_OPT_NONEG) ||
 325                     opts->long_name))
 326                        err |= optbug(opts, "uses feature "
 327                                        "not supported for dashless options");
 328                switch (opts->type) {
 329                case OPTION_COUNTUP:
 330                case OPTION_BIT:
 331                case OPTION_NEGBIT:
 332                case OPTION_SET_INT:
 333                case OPTION_SET_PTR:
 334                case OPTION_NUMBER:
 335                        if ((opts->flags & PARSE_OPT_OPTARG) ||
 336                            !(opts->flags & PARSE_OPT_NOARG))
 337                                err |= optbug(opts, "should not accept an argument");
 338                default:
 339                        ; /* ok. (usually accepts an argument) */
 340                }
 341        }
 342        if (err)
 343                exit(128);
 344}
 345
 346void parse_options_start(struct parse_opt_ctx_t *ctx,
 347                         int argc, const char **argv, const char *prefix,
 348                         const struct option *options, int flags)
 349{
 350        memset(ctx, 0, sizeof(*ctx));
 351        ctx->argc = argc - 1;
 352        ctx->argv = argv + 1;
 353        ctx->out  = argv;
 354        ctx->prefix = prefix;
 355        ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 356        ctx->flags = flags;
 357        if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 358            (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 359                die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 360        parse_options_check(options);
 361}
 362
 363static int usage_with_options_internal(struct parse_opt_ctx_t *,
 364                                       const char * const *,
 365                                       const struct option *, int, int);
 366
 367int parse_options_step(struct parse_opt_ctx_t *ctx,
 368                       const struct option *options,
 369                       const char * const usagestr[])
 370{
 371        int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 372
 373        /* we must reset ->opt, unknown short option leave it dangling */
 374        ctx->opt = NULL;
 375
 376        for (; ctx->argc; ctx->argc--, ctx->argv++) {
 377                const char *arg = ctx->argv[0];
 378
 379                if (*arg != '-' || !arg[1]) {
 380                        if (parse_nodash_opt(ctx, arg, options) == 0)
 381                                continue;
 382                        if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 383                                return PARSE_OPT_NON_OPTION;
 384                        ctx->out[ctx->cpidx++] = ctx->argv[0];
 385                        continue;
 386                }
 387
 388                if (arg[1] != '-') {
 389                        ctx->opt = arg + 1;
 390                        if (internal_help && *ctx->opt == 'h')
 391                                return parse_options_usage(ctx, usagestr, options, 0);
 392                        switch (parse_short_opt(ctx, options)) {
 393                        case -1:
 394                                return parse_options_usage(ctx, usagestr, options, 1);
 395                        case -2:
 396                                if (ctx->opt)
 397                                        check_typos(arg + 1, options);
 398                                goto unknown;
 399                        }
 400                        if (ctx->opt)
 401                                check_typos(arg + 1, options);
 402                        while (ctx->opt) {
 403                                if (internal_help && *ctx->opt == 'h')
 404                                        return parse_options_usage(ctx, usagestr, options, 0);
 405                                switch (parse_short_opt(ctx, options)) {
 406                                case -1:
 407                                        return parse_options_usage(ctx, usagestr, options, 1);
 408                                case -2:
 409                                        /* fake a short option thing to hide the fact that we may have
 410                                         * started to parse aggregated stuff
 411                                         *
 412                                         * This is leaky, too bad.
 413                                         */
 414                                        ctx->argv[0] = xstrdup(ctx->opt - 1);
 415                                        *(char *)ctx->argv[0] = '-';
 416                                        goto unknown;
 417                                }
 418                        }
 419                        continue;
 420                }
 421
 422                if (!arg[2]) { /* "--" */
 423                        if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 424                                ctx->argc--;
 425                                ctx->argv++;
 426                        }
 427                        break;
 428                }
 429
 430                if (internal_help && !strcmp(arg + 2, "help-all"))
 431                        return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 432                if (internal_help && !strcmp(arg + 2, "help"))
 433                        return parse_options_usage(ctx, usagestr, options, 0);
 434                switch (parse_long_opt(ctx, arg + 2, options)) {
 435                case -1:
 436                        return parse_options_usage(ctx, usagestr, options, 1);
 437                case -2:
 438                        goto unknown;
 439                }
 440                continue;
 441unknown:
 442                if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 443                        return PARSE_OPT_UNKNOWN;
 444                ctx->out[ctx->cpidx++] = ctx->argv[0];
 445                ctx->opt = NULL;
 446        }
 447        return PARSE_OPT_DONE;
 448}
 449
 450int parse_options_end(struct parse_opt_ctx_t *ctx)
 451{
 452        memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 453        ctx->out[ctx->cpidx + ctx->argc] = NULL;
 454        return ctx->cpidx + ctx->argc;
 455}
 456
 457int parse_options(int argc, const char **argv, const char *prefix,
 458                  const struct option *options, const char * const usagestr[],
 459                  int flags)
 460{
 461        struct parse_opt_ctx_t ctx;
 462
 463        parse_options_start(&ctx, argc, argv, prefix, options, flags);
 464        switch (parse_options_step(&ctx, options, usagestr)) {
 465        case PARSE_OPT_HELP:
 466                exit(129);
 467        case PARSE_OPT_NON_OPTION:
 468        case PARSE_OPT_DONE:
 469                break;
 470        default: /* PARSE_OPT_UNKNOWN */
 471                if (ctx.argv[0][1] == '-') {
 472                        error("unknown option `%s'", ctx.argv[0] + 2);
 473                } else {
 474                        error("unknown switch `%c'", *ctx.opt);
 475                }
 476                usage_with_options(usagestr, options);
 477        }
 478
 479        precompose_argv(argc, argv);
 480        return parse_options_end(&ctx);
 481}
 482
 483static int usage_argh(const struct option *opts, FILE *outfile)
 484{
 485        const char *s;
 486        int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 487        if (opts->flags & PARSE_OPT_OPTARG)
 488                if (opts->long_name)
 489                        s = literal ? "[=%s]" : "[=<%s>]";
 490                else
 491                        s = literal ? "[%s]" : "[<%s>]";
 492        else
 493                s = literal ? " %s" : " <%s>";
 494        return fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
 495}
 496
 497#define USAGE_OPTS_WIDTH 24
 498#define USAGE_GAP         2
 499
 500static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 501                                       const char * const *usagestr,
 502                                       const struct option *opts, int full, int err)
 503{
 504        FILE *outfile = err ? stderr : stdout;
 505
 506        if (!usagestr)
 507                return PARSE_OPT_HELP;
 508
 509        if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 510                fprintf(outfile, "cat <<\\EOF\n");
 511
 512        fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
 513        while (*usagestr && **usagestr)
 514                /* TRANSLATORS: the colon here should align with the
 515                   one in "usage: %s" translation */
 516                fprintf_ln(outfile, _("   or: %s"), _(*usagestr++));
 517        while (*usagestr) {
 518                if (**usagestr)
 519                        fprintf_ln(outfile, _("    %s"), _(*usagestr));
 520                else
 521                        putchar('\n');
 522                usagestr++;
 523        }
 524
 525        if (opts->type != OPTION_GROUP)
 526                fputc('\n', outfile);
 527
 528        for (; opts->type != OPTION_END; opts++) {
 529                size_t pos;
 530                int pad;
 531
 532                if (opts->type == OPTION_GROUP) {
 533                        fputc('\n', outfile);
 534                        if (*opts->help)
 535                                fprintf(outfile, "%s\n", _(opts->help));
 536                        continue;
 537                }
 538                if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 539                        continue;
 540
 541                pos = fprintf(outfile, "    ");
 542                if (opts->short_name) {
 543                        if (opts->flags & PARSE_OPT_NODASH)
 544                                pos += fprintf(outfile, "%c", opts->short_name);
 545                        else
 546                                pos += fprintf(outfile, "-%c", opts->short_name);
 547                }
 548                if (opts->long_name && opts->short_name)
 549                        pos += fprintf(outfile, ", ");
 550                if (opts->long_name)
 551                        pos += fprintf(outfile, "--%s", opts->long_name);
 552                if (opts->type == OPTION_NUMBER)
 553                        pos += fprintf(outfile, "-NUM");
 554
 555                if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 556                    !(opts->flags & PARSE_OPT_NOARG))
 557                        pos += usage_argh(opts, outfile);
 558
 559                if (pos <= USAGE_OPTS_WIDTH)
 560                        pad = USAGE_OPTS_WIDTH - pos;
 561                else {
 562                        fputc('\n', outfile);
 563                        pad = USAGE_OPTS_WIDTH;
 564                }
 565                fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
 566        }
 567        fputc('\n', outfile);
 568
 569        if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 570                fputs("EOF\n", outfile);
 571
 572        return PARSE_OPT_HELP;
 573}
 574
 575void NORETURN usage_with_options(const char * const *usagestr,
 576                        const struct option *opts)
 577{
 578        usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 579        exit(129);
 580}
 581
 582void NORETURN usage_msg_opt(const char *msg,
 583                   const char * const *usagestr,
 584                   const struct option *options)
 585{
 586        fprintf(stderr, "%s\n\n", msg);
 587        usage_with_options(usagestr, options);
 588}
 589
 590static int parse_options_usage(struct parse_opt_ctx_t *ctx,
 591                               const char * const *usagestr,
 592                               const struct option *opts, int err)
 593{
 594        return usage_with_options_internal(ctx, usagestr, opts, 0, err);
 595}
 596