parse-options.c

   1 #include "git-compat-util.h"
   2 #include "parse-options.h"
   3 #include "cache.h"
   4 #include "commit.h"
   5 #include "color.h"
   6 #include "utf8.h"
   7
   8 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
   9                                const char * const *usagestr,
  10                                const struct option *opts, int err);
  11
  12 #define OPT_SHORT 1
  13 #define OPT_UNSET 2
  14
  15 int optbug(const struct option *opt, const char *reason)
  16 {
  17         if (opt->long_name)
  18                 return error("BUG: option '%s' %s", opt->long_name, reason);
  19         return error("BUG: switch '%c' %s", opt->short_name, reason);
  20 }
  21
  22 static 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
  38 static 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
  46 static 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         if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
  58                 return opterror(opt, "takes no value", flags);
  59
  60         switch (opt->type) {
  61         case OPTION_LOWLEVEL_CALLBACK:
  62                 return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
  63
  64         case OPTION_BIT:
  65                 if (unset)
  66                         *(int *)opt->value &= ~opt->defval;
  67                 else
  68                         *(int *)opt->value |= opt->defval;
  69                 return 0;
  70
  71         case OPTION_NEGBIT:
  72                 if (unset)
  73                         *(int *)opt->value |= opt->defval;
  74                 else
  75                         *(int *)opt->value &= ~opt->defval;
  76                 return 0;
  77
  78         case OPTION_COUNTUP:
  79                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  80                 return 0;
  81
  82         case OPTION_SET_INT:
  83                 *(int *)opt->value = unset ? 0 : opt->defval;
  84                 return 0;
  85
  86         case OPTION_SET_PTR:
  87                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
  88                 return 0;
  89
  90         case OPTION_STRING:
  91                 if (unset)
  92                         *(const char **)opt->value = NULL;
  93                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
  94                         *(const char **)opt->value = (const char *)opt->defval;
  95                 else
  96                         return get_arg(p, opt, flags, (const char **)opt->value);
  97                 return 0;
  98
  99         case OPTION_FILENAME:
 100                 err = 0;
 101                 if (unset)
 102                         *(const char **)opt->value = NULL;
 103                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 104                         *(const char **)opt->value = (const char *)opt->defval;
 105                 else
 106                         err = get_arg(p, opt, flags, (const char **)opt->value);
 107
 108                 if (!err)
 109                         fix_filename(p->prefix, (const char **)opt->value);
 110                 return err;
 111
 112         case OPTION_CALLBACK:
 113                 if (unset)
 114                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 115                 if (opt->flags & PARSE_OPT_NOARG)
 116                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 117                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 118                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 119                 if (get_arg(p, opt, flags, &arg))
 120                         return -1;
 121                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 122
 123         case OPTION_INTEGER:
 124                 if (unset) {
 125                         *(int *)opt->value = 0;
 126                         return 0;
 127                 }
 128                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 129                         *(int *)opt->value = opt->defval;
 130                         return 0;
 131                 }
 132                 if (get_arg(p, opt, flags, &arg))
 133                         return -1;
 134                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 135                 if (*s)
 136                         return opterror(opt, "expects a numerical value", flags);
 137                 return 0;
 138
 139         default:
 140                 die("should not happen, someone must be hit on the forehead");
 141         }
 142 }
 143
 144 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 145 {
 146         const struct option *numopt = NULL;
 147
 148         for (; options->type != OPTION_END; options++) {
 149                 if (options->short_name == *p->opt) {
 150                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 151                         return get_value(p, options, OPT_SHORT);
 152                 }
 153
 154                 /*
 155                  * Handle the numerical option later, explicit one-digit
 156                  * options take precedence over it.
 157                  */
 158                 if (options->type == OPTION_NUMBER)
 159                         numopt = options;
 160         }
 161         if (numopt && isdigit(*p->opt)) {
 162                 size_t len = 1;
 163                 char *arg;
 164                 int rc;
 165
 166                 while (isdigit(p->opt[len]))
 167                         len++;
 168                 arg = xmemdupz(p->opt, len);
 169                 p->opt = p->opt[len] ? p->opt + len : NULL;
 170                 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 171                 free(arg);
 172                 return rc;
 173         }
 174         return -2;
 175 }
 176
 177 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 178                           const struct option *options)
 179 {
 180         const char *arg_end = strchr(arg, '=');
 181         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 182         int abbrev_flags = 0, ambiguous_flags = 0;
 183
 184         if (!arg_end)
 185                 arg_end = arg + strlen(arg);
 186
 187         for (; options->type != OPTION_END; options++) {
 188                 const char *rest, *long_name = options->long_name;
 189                 int flags = 0, opt_flags = 0;
 190
 191                 if (!long_name)
 192                         continue;
 193
 194 again:
 195                 rest = skip_prefix(arg, long_name);
 196                 if (options->type == OPTION_ARGUMENT) {
 197                         if (!rest)
 198                                 continue;
 199                         if (*rest == '=')
 200                                 return opterror(options, "takes no value", flags);
 201                         if (*rest)
 202                                 continue;
 203                         p->out[p->cpidx++] = arg - 2;
 204                         return 0;
 205                 }
 206                 if (!rest) {
 207                         /* abbreviated? */
 208                         if (!strncmp(long_name, arg, arg_end - arg)) {
 209 is_abbreviated:
 210                                 if (abbrev_option) {
 211                                         /*
 212                                          * If this is abbreviated, it is
 213                                          * ambiguous. So when there is no
 214                                          * exact match later, we need to
 215                                          * error out.
 216                                          */
 217                                         ambiguous_option = abbrev_option;
 218                                         ambiguous_flags = abbrev_flags;
 219                                 }
 220                                 if (!(flags & OPT_UNSET) && *arg_end)
 221                                         p->opt = arg_end + 1;
 222                                 abbrev_option = options;
 223                                 abbrev_flags = flags ^ opt_flags;
 224                                 continue;
 225                         }
 226                         /* negation allowed? */
 227                         if (options->flags & PARSE_OPT_NONEG)
 228                                 continue;
 229                         /* negated and abbreviated very much? */
 230                         if (!prefixcmp("no-", arg)) {
 231                                 flags |= OPT_UNSET;
 232                                 goto is_abbreviated;
 233                         }
 234                         /* negated? */
 235                         if (prefixcmp(arg, "no-")) {
 236                                 if (!prefixcmp(long_name, "no-")) {
 237                                         long_name += 3;
 238                                         opt_flags |= OPT_UNSET;
 239                                         goto again;
 240                                 }
 241                                 continue;
 242                         }
 243                         flags |= OPT_UNSET;
 244                         rest = skip_prefix(arg + 3, long_name);
 245                         /* abbreviated and negated? */
 246                         if (!rest && !prefixcmp(long_name, arg + 3))
 247                                 goto is_abbreviated;
 248                         if (!rest)
 249                                 continue;
 250                 }
 251                 if (*rest) {
 252                         if (*rest != '=')
 253                                 continue;
 254                         p->opt = rest + 1;
 255                 }
 256                 return get_value(p, options, flags ^ opt_flags);
 257         }
 258
 259         if (ambiguous_option)
 260                 return error("Ambiguous option: %s "
 261                         "(could be --%s%s or --%s%s)",
 262                         arg,
 263                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 264                         ambiguous_option->long_name,
 265                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 266                         abbrev_option->long_name);
 267         if (abbrev_option)
 268                 return get_value(p, abbrev_option, abbrev_flags);
 269         return -2;
 270 }
 271
 272 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 273                             const struct option *options)
 274 {
 275         for (; options->type != OPTION_END; options++) {
 276                 if (!(options->flags & PARSE_OPT_NODASH))
 277                         continue;
 278                 if (options->short_name == arg[0] && arg[1] == '\0')
 279                         return get_value(p, options, OPT_SHORT);
 280         }
 281         return -2;
 282 }
 283
 284 static void check_typos(const char *arg, const struct option *options)
 285 {
 286         if (strlen(arg) < 3)
 287                 return;
 288
 289         if (!prefixcmp(arg, "no-")) {
 290                 error ("did you mean `--%s` (with two dashes ?)", arg);
 291                 exit(129);
 292         }
 293
 294         for (; options->type != OPTION_END; options++) {
 295                 if (!options->long_name)
 296                         continue;
 297                 if (!prefixcmp(options->long_name, arg)) {
 298                         error ("did you mean `--%s` (with two dashes ?)", arg);
 299                         exit(129);
 300                 }
 301         }
 302 }
 303
 304 static void parse_options_check(const struct option *opts)
 305 {
 306         int err = 0;
 307
 308         for (; opts->type != OPTION_END; opts++) {
 309                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 310                     (opts->flags & PARSE_OPT_OPTARG))
 311                         err |= optbug(opts, "uses incompatible flags "
 312                                         "LASTARG_DEFAULT and OPTARG");
 313                 if (opts->flags & PARSE_OPT_NODASH &&
 314                     ((opts->flags & PARSE_OPT_OPTARG) ||
 315                      !(opts->flags & PARSE_OPT_NOARG) ||
 316                      !(opts->flags & PARSE_OPT_NONEG) ||
 317                      opts->long_name))
 318                         err |= optbug(opts, "uses feature "
 319                                         "not supported for dashless options");
 320                 switch (opts->type) {
 321                 case OPTION_COUNTUP:
 322                 case OPTION_BIT:
 323                 case OPTION_NEGBIT:
 324                 case OPTION_SET_INT:
 325                 case OPTION_SET_PTR:
 326                 case OPTION_NUMBER:
 327                         if ((opts->flags & PARSE_OPT_OPTARG) ||
 328                             !(opts->flags & PARSE_OPT_NOARG))
 329                                 err |= optbug(opts, "should not accept an argument");
 330                 default:
 331                         ; /* ok. (usually accepts an argument) */
 332                 }
 333         }
 334         if (err)
 335                 exit(128);
 336 }
 337
 338 void parse_options_start(struct parse_opt_ctx_t *ctx,
 339                          int argc, const char **argv, const char *prefix,
 340                          const struct option *options, 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         parse_options_check(options);
 353 }
 354
 355 static int usage_with_options_internal(struct parse_opt_ctx_t *,
 356                                        const char * const *,
 357                                        const struct option *, int, int);
 358
 359 int parse_options_step(struct parse_opt_ctx_t *ctx,
 360                        const struct option *options,
 361                        const char * const usagestr[])
 362 {
 363         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 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                                 return PARSE_OPT_NON_OPTION;
 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(ctx, usagestr, options, 0);
 384                         switch (parse_short_opt(ctx, options)) {
 385                         case -1:
 386                                 return parse_options_usage(ctx, usagestr, options, 1);
 387                         case -2:
 388                                 if (ctx->opt)
 389                                         check_typos(arg + 1, options);
 390                                 goto unknown;
 391                         }
 392                         if (ctx->opt)
 393                                 check_typos(arg + 1, options);
 394                         while (ctx->opt) {
 395                                 if (internal_help && *ctx->opt == 'h')
 396                                         return parse_options_usage(ctx, usagestr, options, 0);
 397                                 switch (parse_short_opt(ctx, options)) {
 398                                 case -1:
 399                                         return parse_options_usage(ctx, usagestr, options, 1);
 400                                 case -2:
 401                                         /* fake a short option thing to hide the fact that we may have
 402                                          * started to parse aggregated stuff
 403                                          *
 404                                          * This is leaky, too bad.
 405                                          */
 406                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 407                                         *(char *)ctx->argv[0] = '-';
 408                                         goto unknown;
 409                                 }
 410                         }
 411                         continue;
 412                 }
 413
 414                 if (!arg[2]) { /* "--" */
 415                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 416                                 ctx->argc--;
 417                                 ctx->argv++;
 418                         }
 419                         break;
 420                 }
 421
 422                 if (internal_help && !strcmp(arg + 2, "help-all"))
 423                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 424                 if (internal_help && !strcmp(arg + 2, "help"))
 425                         return parse_options_usage(ctx, usagestr, options, 0);
 426                 switch (parse_long_opt(ctx, arg + 2, options)) {
 427                 case -1:
 428                         return parse_options_usage(ctx, usagestr, options, 1);
 429                 case -2:
 430                         goto unknown;
 431                 }
 432                 continue;
 433 unknown:
 434                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 435                         return PARSE_OPT_UNKNOWN;
 436                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 437                 ctx->opt = NULL;
 438         }
 439         return PARSE_OPT_DONE;
 440 }
 441
 442 int parse_options_end(struct parse_opt_ctx_t *ctx)
 443 {
 444         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 445         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 446         return ctx->cpidx + ctx->argc;
 447 }
 448
 449 int parse_options(int argc, const char **argv, const char *prefix,
 450                   const struct option *options, const char * const usagestr[],
 451                   int flags)
 452 {
 453         struct parse_opt_ctx_t ctx;
 454
 455         parse_options_start(&ctx, argc, argv, prefix, options, flags);
 456         switch (parse_options_step(&ctx, options, usagestr)) {
 457         case PARSE_OPT_HELP:
 458                 exit(129);
 459         case PARSE_OPT_NON_OPTION:
 460         case PARSE_OPT_DONE:
 461                 break;
 462         default: /* PARSE_OPT_UNKNOWN */
 463                 if (ctx.argv[0][1] == '-') {
 464                         error("unknown option `%s'", ctx.argv[0] + 2);
 465                 } else {
 466                         error("unknown switch `%c'", *ctx.opt);
 467                 }
 468                 usage_with_options(usagestr, options);
 469         }
 470
 471         precompose_argv(argc, argv);
 472         return parse_options_end(&ctx);
 473 }
 474
 475 static int usage_argh(const struct option *opts, FILE *outfile)
 476 {
 477         const char *s;
 478         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 479         if (opts->flags & PARSE_OPT_OPTARG)
 480                 if (opts->long_name)
 481                         s = literal ? "[=%s]" : "[=<%s>]";
 482                 else
 483                         s = literal ? "[%s]" : "[<%s>]";
 484         else
 485                 s = literal ? " %s" : " <%s>";
 486         return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
 487 }
 488
 489 #define USAGE_OPTS_WIDTH 24
 490 #define USAGE_GAP         2
 491
 492 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 493                                        const char * const *usagestr,
 494                                        const struct option *opts, int full, int err)
 495 {
 496         FILE *outfile = err ? stderr : stdout;
 497
 498         if (!usagestr)
 499                 return PARSE_OPT_HELP;
 500
 501         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 502                 fprintf(outfile, "cat <<\\EOF\n");
 503
 504         fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
 505         while (*usagestr && **usagestr)
 506                 /* TRANSLATORS: the colon here should align with the
 507                    one in "usage: %s" translation */
 508                 fprintf_ln(outfile, _("   or: %s"), _(*usagestr++));
 509         while (*usagestr) {
 510                 if (**usagestr)
 511                         fprintf_ln(outfile, _("    %s"), _(*usagestr));
 512                 else
 513                         putchar('\n');
 514                 usagestr++;
 515         }
 516
 517         if (opts->type != OPTION_GROUP)
 518                 fputc('\n', outfile);
 519
 520         for (; opts->type != OPTION_END; opts++) {
 521                 size_t pos;
 522                 int pad;
 523
 524                 if (opts->type == OPTION_GROUP) {
 525                         fputc('\n', outfile);
 526                         if (*opts->help)
 527                                 fprintf(outfile, "%s\n", _(opts->help));
 528                         continue;
 529                 }
 530                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 531                         continue;
 532
 533                 pos = fprintf(outfile, "    ");
 534                 if (opts->short_name) {
 535                         if (opts->flags & PARSE_OPT_NODASH)
 536                                 pos += fprintf(outfile, "%c", opts->short_name);
 537                         else
 538                                 pos += fprintf(outfile, "-%c", opts->short_name);
 539                 }
 540                 if (opts->long_name && opts->short_name)
 541                         pos += fprintf(outfile, ", ");
 542                 if (opts->long_name)
 543                         pos += fprintf(outfile, "--%s", opts->long_name);
 544                 if (opts->type == OPTION_NUMBER)
 545                         pos += utf8_fprintf(outfile, _("-NUM"));
 546
 547                 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 548                     !(opts->flags & PARSE_OPT_NOARG))
 549                         pos += usage_argh(opts, outfile);
 550
 551                 if (pos <= USAGE_OPTS_WIDTH)
 552                         pad = USAGE_OPTS_WIDTH - pos;
 553                 else {
 554                         fputc('\n', outfile);
 555                         pad = USAGE_OPTS_WIDTH;
 556                 }
 557                 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
 558         }
 559         fputc('\n', outfile);
 560
 561         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 562                 fputs("EOF\n", outfile);
 563
 564         return PARSE_OPT_HELP;
 565 }
 566
 567 void NORETURN usage_with_options(const char * const *usagestr,
 568                         const struct option *opts)
 569 {
 570         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 571         exit(129);
 572 }
 573
 574 void NORETURN usage_msg_opt(const char *msg,
 575                    const char * const *usagestr,
 576                    const struct option *options)
 577 {
 578         fprintf(stderr, "%s\n\n", msg);
 579         usage_with_options(usagestr, options);
 580 }
 581
 582 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
 583                                const char * const *usagestr,
 584                                const struct option *opts, int err)
 585 {
 586         return usage_with_options_internal(ctx, usagestr, opts, 0, err);
 587 }
 588
 589 #undef opterror
 590 int opterror(const struct option *opt, const char *reason, int flags)
 591 {
 592         if (flags & OPT_SHORT)
 593                 return error("switch `%c' %s", opt->short_name, reason);
 594         if (flags & OPT_UNSET)
 595                 return error("option `no-%s' %s", opt->long_name, reason);
 596         return error("option `%s' %s", opt->long_name, reason);
 597 }