Andrew's git / gitweb.git / parse-options.c
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parse-options.con commit Teach rebase the --no-ff option. (b499549)
   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(const char * const *usagestr,
   8                               const struct option *opts);
   9
  10#define OPT_SHORT 1
  11#define OPT_UNSET 2
  12
  13static int opterror(const struct option *opt, const char *reason, int flags)
  14{
  15        if (flags & OPT_SHORT)
  16                return error("switch `%c' %s", opt->short_name, reason);
  17        if (flags & OPT_UNSET)
  18                return error("option `no-%s' %s", opt->long_name, reason);
  19        return error("option `%s' %s", opt->long_name, reason);
  20}
  21
  22static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  23                   int flags, const char **arg)
  24{
  25        if (p->opt) {
  26                *arg = p->opt;
  27                p->opt = NULL;
  28        } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  29                *arg = (const char *)opt->defval;
  30        } else if (p->argc > 1) {
  31                p->argc--;
  32                *arg = *++p->argv;
  33        } else
  34                return opterror(opt, "requires a value", flags);
  35        return 0;
  36}
  37
  38static void fix_filename(const char *prefix, const char **file)
  39{
  40        if (!file || !*file || !prefix || is_absolute_path(*file)
  41            || !strcmp("-", *file))
  42                return;
  43        *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
  44}
  45
  46static int get_value(struct parse_opt_ctx_t *p,
  47                     const struct option *opt, int flags)
  48{
  49        const char *s, *arg;
  50        const int unset = flags & OPT_UNSET;
  51        int err;
  52
  53        if (unset && p->opt)
  54                return opterror(opt, "takes no value", flags);
  55        if (unset && (opt->flags & PARSE_OPT_NONEG))
  56                return opterror(opt, "isn't available", flags);
  57
  58        if (!(flags & OPT_SHORT) && p->opt) {
  59                switch (opt->type) {
  60                case OPTION_CALLBACK:
  61                        if (!(opt->flags & PARSE_OPT_NOARG))
  62                                break;
  63                        /* FALLTHROUGH */
  64                case OPTION_BOOLEAN:
  65                case OPTION_BIT:
  66                case OPTION_NEGBIT:
  67                case OPTION_SET_INT:
  68                case OPTION_SET_PTR:
  69                        return opterror(opt, "takes no value", flags);
  70                default:
  71                        break;
  72                }
  73        }
  74
  75        switch (opt->type) {
  76        case OPTION_BIT:
  77                if (unset)
  78                        *(int *)opt->value &= ~opt->defval;
  79                else
  80                        *(int *)opt->value |= opt->defval;
  81                return 0;
  82
  83        case OPTION_NEGBIT:
  84                if (unset)
  85                        *(int *)opt->value |= opt->defval;
  86                else
  87                        *(int *)opt->value &= ~opt->defval;
  88                return 0;
  89
  90        case OPTION_BOOLEAN:
  91                *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  92                return 0;
  93
  94        case OPTION_SET_INT:
  95                *(int *)opt->value = unset ? 0 : opt->defval;
  96                return 0;
  97
  98        case OPTION_SET_PTR:
  99                *(void **)opt->value = unset ? NULL : (void *)opt->defval;
 100                return 0;
 101
 102        case OPTION_STRING:
 103                if (unset)
 104                        *(const char **)opt->value = NULL;
 105                else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 106                        *(const char **)opt->value = (const char *)opt->defval;
 107                else
 108                        return get_arg(p, opt, flags, (const char **)opt->value);
 109                return 0;
 110
 111        case OPTION_FILENAME:
 112                err = 0;
 113                if (unset)
 114                        *(const char **)opt->value = NULL;
 115                else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 116                        *(const char **)opt->value = (const char *)opt->defval;
 117                else
 118                        err = get_arg(p, opt, flags, (const char **)opt->value);
 119
 120                if (!err)
 121                        fix_filename(p->prefix, (const char **)opt->value);
 122                return err;
 123
 124        case OPTION_CALLBACK:
 125                if (unset)
 126                        return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 127                if (opt->flags & PARSE_OPT_NOARG)
 128                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 129                if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 130                        return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 131                if (get_arg(p, opt, flags, &arg))
 132                        return -1;
 133                return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 134
 135        case OPTION_INTEGER:
 136                if (unset) {
 137                        *(int *)opt->value = 0;
 138                        return 0;
 139                }
 140                if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 141                        *(int *)opt->value = opt->defval;
 142                        return 0;
 143                }
 144                if (get_arg(p, opt, flags, &arg))
 145                        return -1;
 146                *(int *)opt->value = strtol(arg, (char **)&s, 10);
 147                if (*s)
 148                        return opterror(opt, "expects a numerical value", flags);
 149                return 0;
 150
 151        default:
 152                die("should not happen, someone must be hit on the forehead");
 153        }
 154}
 155
 156static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 157{
 158        const struct option *numopt = NULL;
 159
 160        for (; options->type != OPTION_END; options++) {
 161                if (options->short_name == *p->opt) {
 162                        p->opt = p->opt[1] ? p->opt + 1 : NULL;
 163                        return get_value(p, options, OPT_SHORT);
 164                }
 165
 166                /*
 167                 * Handle the numerical option later, explicit one-digit
 168                 * options take precedence over it.
 169                 */
 170                if (options->type == OPTION_NUMBER)
 171                        numopt = options;
 172        }
 173        if (numopt && isdigit(*p->opt)) {
 174                size_t len = 1;
 175                char *arg;
 176                int rc;
 177
 178                while (isdigit(p->opt[len]))
 179                        len++;
 180                arg = xmemdupz(p->opt, len);
 181                p->opt = p->opt[len] ? p->opt + len : NULL;
 182                rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 183                free(arg);
 184                return rc;
 185        }
 186        return -2;
 187}
 188
 189static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 190                          const struct option *options)
 191{
 192        const char *arg_end = strchr(arg, '=');
 193        const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 194        int abbrev_flags = 0, ambiguous_flags = 0;
 195
 196        if (!arg_end)
 197                arg_end = arg + strlen(arg);
 198
 199        for (; options->type != OPTION_END; options++) {
 200                const char *rest;
 201                int flags = 0;
 202
 203                if (!options->long_name)
 204                        continue;
 205
 206                rest = skip_prefix(arg, options->long_name);
 207                if (options->type == OPTION_ARGUMENT) {
 208                        if (!rest)
 209                                continue;
 210                        if (*rest == '=')
 211                                return opterror(options, "takes no value", flags);
 212                        if (*rest)
 213                                continue;
 214                        p->out[p->cpidx++] = arg - 2;
 215                        return 0;
 216                }
 217                if (!rest) {
 218                        /* abbreviated? */
 219                        if (!strncmp(options->long_name, arg, arg_end - arg)) {
 220is_abbreviated:
 221                                if (abbrev_option) {
 222                                        /*
 223                                         * If this is abbreviated, it is
 224                                         * ambiguous. So when there is no
 225                                         * exact match later, we need to
 226                                         * error out.
 227                                         */
 228                                        ambiguous_option = abbrev_option;
 229                                        ambiguous_flags = abbrev_flags;
 230                                }
 231                                if (!(flags & OPT_UNSET) && *arg_end)
 232                                        p->opt = arg_end + 1;
 233                                abbrev_option = options;
 234                                abbrev_flags = flags;
 235                                continue;
 236                        }
 237                        /* negation allowed? */
 238                        if (options->flags & PARSE_OPT_NONEG)
 239                                continue;
 240                        /* negated and abbreviated very much? */
 241                        if (!prefixcmp("no-", arg)) {
 242                                flags |= OPT_UNSET;
 243                                goto is_abbreviated;
 244                        }
 245                        /* negated? */
 246                        if (strncmp(arg, "no-", 3))
 247                                continue;
 248                        flags |= OPT_UNSET;
 249                        rest = skip_prefix(arg + 3, options->long_name);
 250                        /* abbreviated and negated? */
 251                        if (!rest && !prefixcmp(options->long_name, arg + 3))
 252                                goto is_abbreviated;
 253                        if (!rest)
 254                                continue;
 255                }
 256                if (*rest) {
 257                        if (*rest != '=')
 258                                continue;
 259                        p->opt = rest + 1;
 260                }
 261                return get_value(p, options, flags);
 262        }
 263
 264        if (ambiguous_option)
 265                return error("Ambiguous option: %s "
 266                        "(could be --%s%s or --%s%s)",
 267                        arg,
 268                        (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 269                        ambiguous_option->long_name,
 270                        (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 271                        abbrev_option->long_name);
 272        if (abbrev_option)
 273                return get_value(p, abbrev_option, abbrev_flags);
 274        return -2;
 275}
 276
 277static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 278                            const struct option *options)
 279{
 280        for (; options->type != OPTION_END; options++) {
 281                if (!(options->flags & PARSE_OPT_NODASH))
 282                        continue;
 283                if ((options->flags & PARSE_OPT_OPTARG) ||
 284                    !(options->flags & PARSE_OPT_NOARG))
 285                        die("BUG: dashless options don't support arguments");
 286                if (!(options->flags & PARSE_OPT_NONEG))
 287                        die("BUG: dashless options don't support negation");
 288                if (options->long_name)
 289                        die("BUG: dashless options can't be long");
 290                if (options->short_name == arg[0] && arg[1] == '\0')
 291                        return get_value(p, options, OPT_SHORT);
 292        }
 293        return -2;
 294}
 295
 296static void check_typos(const char *arg, const struct option *options)
 297{
 298        if (strlen(arg) < 3)
 299                return;
 300
 301        if (!prefixcmp(arg, "no-")) {
 302                error ("did you mean `--%s` (with two dashes ?)", arg);
 303                exit(129);
 304        }
 305
 306        for (; options->type != OPTION_END; options++) {
 307                if (!options->long_name)
 308                        continue;
 309                if (!prefixcmp(options->long_name, arg)) {
 310                        error ("did you mean `--%s` (with two dashes ?)", arg);
 311                        exit(129);
 312                }
 313        }
 314}
 315
 316static void parse_options_check(const struct option *opts)
 317{
 318        int err = 0;
 319
 320        for (; opts->type != OPTION_END; opts++) {
 321                if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 322                    (opts->flags & PARSE_OPT_OPTARG)) {
 323                        if (opts->long_name) {
 324                                error("`--%s` uses incompatible flags "
 325                                      "LASTARG_DEFAULT and OPTARG", opts->long_name);
 326                        } else {
 327                                error("`-%c` uses incompatible flags "
 328                                      "LASTARG_DEFAULT and OPTARG", opts->short_name);
 329                        }
 330                        err |= 1;
 331                }
 332        }
 333
 334        if (err)
 335                exit(129);
 336}
 337
 338void parse_options_start(struct parse_opt_ctx_t *ctx,
 339                         int argc, const char **argv, const char *prefix,
 340                         int flags)
 341{
 342        memset(ctx, 0, sizeof(*ctx));
 343        ctx->argc = argc - 1;
 344        ctx->argv = argv + 1;
 345        ctx->out  = argv;
 346        ctx->prefix = prefix;
 347        ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 348        ctx->flags = flags;
 349        if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 350            (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 351                die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 352}
 353
 354static int usage_with_options_internal(const char * const *,
 355                                       const struct option *, int);
 356
 357int parse_options_step(struct parse_opt_ctx_t *ctx,
 358                       const struct option *options,
 359                       const char * const usagestr[])
 360{
 361        int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 362
 363        parse_options_check(options);
 364
 365        /* we must reset ->opt, unknown short option leave it dangling */
 366        ctx->opt = NULL;
 367
 368        for (; ctx->argc; ctx->argc--, ctx->argv++) {
 369                const char *arg = ctx->argv[0];
 370
 371                if (*arg != '-' || !arg[1]) {
 372                        if (parse_nodash_opt(ctx, arg, options) == 0)
 373                                continue;
 374                        if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 375                                break;
 376                        ctx->out[ctx->cpidx++] = ctx->argv[0];
 377                        continue;
 378                }
 379
 380                if (arg[1] != '-') {
 381                        ctx->opt = arg + 1;
 382                        if (internal_help && *ctx->opt == 'h')
 383                                return parse_options_usage(usagestr, options);
 384                        switch (parse_short_opt(ctx, options)) {
 385                        case -1:
 386                                return parse_options_usage(usagestr, options);
 387                        case -2:
 388                                goto unknown;
 389                        }
 390                        if (ctx->opt)
 391                                check_typos(arg + 1, options);
 392                        while (ctx->opt) {
 393                                if (internal_help && *ctx->opt == 'h')
 394                                        return parse_options_usage(usagestr, options);
 395                                switch (parse_short_opt(ctx, options)) {
 396                                case -1:
 397                                        return parse_options_usage(usagestr, options);
 398                                case -2:
 399                                        /* fake a short option thing to hide the fact that we may have
 400                                         * started to parse aggregated stuff
 401                                         *
 402                                         * This is leaky, too bad.
 403                                         */
 404                                        ctx->argv[0] = xstrdup(ctx->opt - 1);
 405                                        *(char *)ctx->argv[0] = '-';
 406                                        goto unknown;
 407                                }
 408                        }
 409                        continue;
 410                }
 411
 412                if (!arg[2]) { /* "--" */
 413                        if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 414                                ctx->argc--;
 415                                ctx->argv++;
 416                        }
 417                        break;
 418                }
 419
 420                if (internal_help && !strcmp(arg + 2, "help-all"))
 421                        return usage_with_options_internal(usagestr, options, 1);
 422                if (internal_help && !strcmp(arg + 2, "help"))
 423                        return parse_options_usage(usagestr, options);
 424                switch (parse_long_opt(ctx, arg + 2, options)) {
 425                case -1:
 426                        return parse_options_usage(usagestr, options);
 427                case -2:
 428                        goto unknown;
 429                }
 430                continue;
 431unknown:
 432                if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 433                        return PARSE_OPT_UNKNOWN;
 434                ctx->out[ctx->cpidx++] = ctx->argv[0];
 435                ctx->opt = NULL;
 436        }
 437        return PARSE_OPT_DONE;
 438}
 439
 440int parse_options_end(struct parse_opt_ctx_t *ctx)
 441{
 442        memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 443        ctx->out[ctx->cpidx + ctx->argc] = NULL;
 444        return ctx->cpidx + ctx->argc;
 445}
 446
 447int parse_options(int argc, const char **argv, const char *prefix,
 448                  const struct option *options, const char * const usagestr[],
 449                  int flags)
 450{
 451        struct parse_opt_ctx_t ctx;
 452
 453        parse_options_start(&ctx, argc, argv, prefix, flags);
 454        switch (parse_options_step(&ctx, options, usagestr)) {
 455        case PARSE_OPT_HELP:
 456                exit(129);
 457        case PARSE_OPT_DONE:
 458                break;
 459        default: /* PARSE_OPT_UNKNOWN */
 460                if (ctx.argv[0][1] == '-') {
 461                        error("unknown option `%s'", ctx.argv[0] + 2);
 462                } else {
 463                        error("unknown switch `%c'", *ctx.opt);
 464                }
 465                usage_with_options(usagestr, options);
 466        }
 467
 468        return parse_options_end(&ctx);
 469}
 470
 471static int usage_argh(const struct option *opts)
 472{
 473        const char *s;
 474        int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 475        if (opts->flags & PARSE_OPT_OPTARG)
 476                if (opts->long_name)
 477                        s = literal ? "[=%s]" : "[=<%s>]";
 478                else
 479                        s = literal ? "[%s]" : "[<%s>]";
 480        else
 481                s = literal ? " %s" : " <%s>";
 482        return fprintf(stderr, s, opts->argh ? opts->argh : "...");
 483}
 484
 485#define USAGE_OPTS_WIDTH 24
 486#define USAGE_GAP         2
 487
 488static int usage_with_options_internal(const char * const *usagestr,
 489                                const struct option *opts, int full)
 490{
 491        if (!usagestr)
 492                return PARSE_OPT_HELP;
 493
 494        fprintf(stderr, "usage: %s\n", *usagestr++);
 495        while (*usagestr && **usagestr)
 496                fprintf(stderr, "   or: %s\n", *usagestr++);
 497        while (*usagestr) {
 498                fprintf(stderr, "%s%s\n",
 499                                **usagestr ? "    " : "",
 500                                *usagestr);
 501                usagestr++;
 502        }
 503
 504        if (opts->type != OPTION_GROUP)
 505                fputc('\n', stderr);
 506
 507        for (; opts->type != OPTION_END; opts++) {
 508                size_t pos;
 509                int pad;
 510
 511                if (opts->type == OPTION_GROUP) {
 512                        fputc('\n', stderr);
 513                        if (*opts->help)
 514                                fprintf(stderr, "%s\n", opts->help);
 515                        continue;
 516                }
 517                if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 518                        continue;
 519
 520                pos = fprintf(stderr, "    ");
 521                if (opts->short_name && !(opts->flags & PARSE_OPT_NEGHELP)) {
 522                        if (opts->flags & PARSE_OPT_NODASH)
 523                                pos += fprintf(stderr, "%c", opts->short_name);
 524                        else
 525                                pos += fprintf(stderr, "-%c", opts->short_name);
 526                }
 527                if (opts->long_name && opts->short_name)
 528                        pos += fprintf(stderr, ", ");
 529                if (opts->long_name)
 530                        pos += fprintf(stderr, "--%s%s",
 531                                (opts->flags & PARSE_OPT_NEGHELP) ?  "no-" : "",
 532                                opts->long_name);
 533                if (opts->type == OPTION_NUMBER)
 534                        pos += fprintf(stderr, "-NUM");
 535
 536                if (!(opts->flags & PARSE_OPT_NOARG))
 537                        pos += usage_argh(opts);
 538
 539                if (pos <= USAGE_OPTS_WIDTH)
 540                        pad = USAGE_OPTS_WIDTH - pos;
 541                else {
 542                        fputc('\n', stderr);
 543                        pad = USAGE_OPTS_WIDTH;
 544                }
 545                fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 546        }
 547        fputc('\n', stderr);
 548
 549        return PARSE_OPT_HELP;
 550}
 551
 552void usage_with_options(const char * const *usagestr,
 553                        const struct option *opts)
 554{
 555        usage_with_options_internal(usagestr, opts, 0);
 556        exit(129);
 557}
 558
 559void usage_msg_opt(const char *msg,
 560                   const char * const *usagestr,
 561                   const struct option *options)
 562{
 563        fprintf(stderr, "%s\n\n", msg);
 564        usage_with_options(usagestr, options);
 565}
 566
 567static int parse_options_usage(const char * const *usagestr,
 568                               const struct option *opts)
 569{
 570        return usage_with_options_internal(usagestr, opts, 0);
 571}
 572
 573
 574/*----- some often used options -----*/
 575#include "cache.h"
 576
 577int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 578{
 579        int v;
 580
 581        if (!arg) {
 582                v = unset ? 0 : DEFAULT_ABBREV;
 583        } else {
 584                v = strtol(arg, (char **)&arg, 10);
 585                if (*arg)
 586                        return opterror(opt, "expects a numerical value", 0);
 587                if (v && v < MINIMUM_ABBREV)
 588                        v = MINIMUM_ABBREV;
 589                else if (v > 40)
 590                        v = 40;
 591        }
 592        *(int *)(opt->value) = v;
 593        return 0;
 594}
 595
 596int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
 597                             int unset)
 598{
 599        *(unsigned long *)(opt->value) = approxidate(arg);
 600        return 0;
 601}
 602
 603int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
 604                            int unset)
 605{
 606        int value;
 607
 608        if (!arg)
 609                arg = unset ? "never" : (const char *)opt->defval;
 610        value = git_config_colorbool(NULL, arg, -1);
 611        if (value < 0)
 612                return opterror(opt,
 613                        "expects \"always\", \"auto\", or \"never\"", 0);
 614        *(int *)opt->value = value;
 615        return 0;
 616}
 617
 618int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
 619                           int unset)
 620{
 621        int *target = opt->value;
 622
 623        if (unset)
 624                /* --no-quiet, --no-verbose */
 625                *target = 0;
 626        else if (opt->short_name == 'v') {
 627                if (*target >= 0)
 628                        (*target)++;
 629                else
 630                        *target = 1;
 631        } else {
 632                if (*target <= 0)
 633                        (*target)--;
 634                else
 635                        *target = -1;
 636        }
 637        return 0;
 638}
 639
 640int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
 641{
 642        unsigned char sha1[20];
 643        struct commit *commit;
 644
 645        if (!arg)
 646                return -1;
 647        if (get_sha1(arg, sha1))
 648                return error("malformed object name %s", arg);
 649        commit = lookup_commit_reference(sha1);
 650        if (!commit)
 651                return error("no such commit %s", arg);
 652        commit_list_insert(commit, opt->value);
 653        return 0;
 654}
 655
 656int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
 657{
 658        int *target = opt->value;
 659        *target = unset ? 2 : 1;
 660        return 0;
 661}