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 int opterror(const struct option *opt, const char *reason, int flags)
  23 {
  24         if (flags & OPT_SHORT)
  25                 return error("switch `%c' %s", opt->short_name, reason);
  26         if (flags & OPT_UNSET)
  27                 return error("option `no-%s' %s", opt->long_name, reason);
  28         return error("option `%s' %s", opt->long_name, reason);
  29 }
  30
  31 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  32                    int flags, const char **arg)
  33 {
  34         if (p->opt) {
  35                 *arg = p->opt;
  36                 p->opt = NULL;
  37         } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  38                 *arg = (const char *)opt->defval;
  39         } else if (p->argc > 1) {
  40                 p->argc--;
  41                 *arg = *++p->argv;
  42         } else
  43                 return opterror(opt, "requires a value", flags);
  44         return 0;
  45 }
  46
  47 static void fix_filename(const char *prefix, const char **file)
  48 {
  49         if (!file || !*file || !prefix || is_absolute_path(*file)
  50             || !strcmp("-", *file))
  51                 return;
  52         *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
  53 }
  54
  55 static int get_value(struct parse_opt_ctx_t *p,
  56                      const struct option *opt, int flags)
  57 {
  58         const char *s, *arg;
  59         const int unset = flags & OPT_UNSET;
  60         int err;
  61
  62         if (unset && p->opt)
  63                 return opterror(opt, "takes no value", flags);
  64         if (unset && (opt->flags & PARSE_OPT_NONEG))
  65                 return opterror(opt, "isn't available", flags);
  66         if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
  67                 return opterror(opt, "takes no value", flags);
  68
  69         switch (opt->type) {
  70         case OPTION_LOWLEVEL_CALLBACK:
  71                 return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
  72
  73         case OPTION_BIT:
  74                 if (unset)
  75                         *(int *)opt->value &= ~opt->defval;
  76                 else
  77                         *(int *)opt->value |= opt->defval;
  78                 return 0;
  79
  80         case OPTION_NEGBIT:
  81                 if (unset)
  82                         *(int *)opt->value |= opt->defval;
  83                 else
  84                         *(int *)opt->value &= ~opt->defval;
  85                 return 0;
  86
  87         case OPTION_COUNTUP:
  88                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  89                 return 0;
  90
  91         case OPTION_SET_INT:
  92                 *(int *)opt->value = unset ? 0 : opt->defval;
  93                 return 0;
  94
  95         case OPTION_SET_PTR:
  96                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
  97                 return 0;
  98
  99         case OPTION_STRING:
 100                 if (unset)
 101                         *(const char **)opt->value = NULL;
 102                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 103                         *(const char **)opt->value = (const char *)opt->defval;
 104                 else
 105                         return get_arg(p, opt, flags, (const char **)opt->value);
 106                 return 0;
 107
 108         case OPTION_FILENAME:
 109                 err = 0;
 110                 if (unset)
 111                         *(const char **)opt->value = NULL;
 112                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 113                         *(const char **)opt->value = (const char *)opt->defval;
 114                 else
 115                         err = get_arg(p, opt, flags, (const char **)opt->value);
 116
 117                 if (!err)
 118                         fix_filename(p->prefix, (const char **)opt->value);
 119                 return err;
 120
 121         case OPTION_CALLBACK:
 122                 if (unset)
 123                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 124                 if (opt->flags & PARSE_OPT_NOARG)
 125                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 126                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 127                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 128                 if (get_arg(p, opt, flags, &arg))
 129                         return -1;
 130                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 131
 132         case OPTION_INTEGER:
 133                 if (unset) {
 134                         *(int *)opt->value = 0;
 135                         return 0;
 136                 }
 137                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 138                         *(int *)opt->value = opt->defval;
 139                         return 0;
 140                 }
 141                 if (get_arg(p, opt, flags, &arg))
 142                         return -1;
 143                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 144                 if (*s)
 145                         return opterror(opt, "expects a numerical value", flags);
 146                 return 0;
 147
 148         default:
 149                 die("should not happen, someone must be hit on the forehead");
 150         }
 151 }
 152
 153 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 154 {
 155         const struct option *numopt = NULL;
 156
 157         for (; options->type != OPTION_END; options++) {
 158                 if (options->short_name == *p->opt) {
 159                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 160                         return get_value(p, options, OPT_SHORT);
 161                 }
 162
 163                 /*
 164                  * Handle the numerical option later, explicit one-digit
 165                  * options take precedence over it.
 166                  */
 167                 if (options->type == OPTION_NUMBER)
 168                         numopt = options;
 169         }
 170         if (numopt && isdigit(*p->opt)) {
 171                 size_t len = 1;
 172                 char *arg;
 173                 int rc;
 174
 175                 while (isdigit(p->opt[len]))
 176                         len++;
 177                 arg = xmemdupz(p->opt, len);
 178                 p->opt = p->opt[len] ? p->opt + len : NULL;
 179                 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 180                 free(arg);
 181                 return rc;
 182         }
 183         return -2;
 184 }
 185
 186 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 187                           const struct option *options)
 188 {
 189         const char *arg_end = strchr(arg, '=');
 190         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 191         int abbrev_flags = 0, ambiguous_flags = 0;
 192
 193         if (!arg_end)
 194                 arg_end = arg + strlen(arg);
 195
 196         for (; options->type != OPTION_END; options++) {
 197                 const char *rest, *long_name = options->long_name;
 198                 int flags = 0, opt_flags = 0;
 199
 200                 if (!long_name)
 201                         continue;
 202
 203 again:
 204                 rest = skip_prefix(arg, long_name);
 205                 if (options->type == OPTION_ARGUMENT) {
 206                         if (!rest)
 207                                 continue;
 208                         if (*rest == '=')
 209                                 return opterror(options, "takes no value", flags);
 210                         if (*rest)
 211                                 continue;
 212                         p->out[p->cpidx++] = arg - 2;
 213                         return 0;
 214                 }
 215                 if (!rest) {
 216                         /* abbreviated? */
 217                         if (!strncmp(long_name, arg, arg_end - arg)) {
 218 is_abbreviated:
 219                                 if (abbrev_option) {
 220                                         /*
 221                                          * If this is abbreviated, it is
 222                                          * ambiguous. So when there is no
 223                                          * exact match later, we need to
 224                                          * error out.
 225                                          */
 226                                         ambiguous_option = abbrev_option;
 227                                         ambiguous_flags = abbrev_flags;
 228                                 }
 229                                 if (!(flags & OPT_UNSET) && *arg_end)
 230                                         p->opt = arg_end + 1;
 231                                 abbrev_option = options;
 232                                 abbrev_flags = flags ^ opt_flags;
 233                                 continue;
 234                         }
 235                         /* negation allowed? */
 236                         if (options->flags & PARSE_OPT_NONEG)
 237                                 continue;
 238                         /* negated and abbreviated very much? */
 239                         if (!prefixcmp("no-", arg)) {
 240                                 flags |= OPT_UNSET;
 241                                 goto is_abbreviated;
 242                         }
 243                         /* negated? */
 244                         if (prefixcmp(arg, "no-")) {
 245                                 if (!prefixcmp(long_name, "no-")) {
 246                                         long_name += 3;
 247                                         opt_flags |= OPT_UNSET;
 248                                         goto again;
 249                                 }
 250                                 continue;
 251                         }
 252                         flags |= OPT_UNSET;
 253                         rest = skip_prefix(arg + 3, long_name);
 254                         /* abbreviated and negated? */
 255                         if (!rest && !prefixcmp(long_name, arg + 3))
 256                                 goto is_abbreviated;
 257                         if (!rest)
 258                                 continue;
 259                 }
 260                 if (*rest) {
 261                         if (*rest != '=')
 262                                 continue;
 263                         p->opt = rest + 1;
 264                 }
 265                 return get_value(p, options, flags ^ opt_flags);
 266         }
 267
 268         if (ambiguous_option)
 269                 return error("Ambiguous option: %s "
 270                         "(could be --%s%s or --%s%s)",
 271                         arg,
 272                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 273                         ambiguous_option->long_name,
 274                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 275                         abbrev_option->long_name);
 276         if (abbrev_option)
 277                 return get_value(p, abbrev_option, abbrev_flags);
 278         return -2;
 279 }
 280
 281 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 282                             const struct option *options)
 283 {
 284         for (; options->type != OPTION_END; options++) {
 285                 if (!(options->flags & PARSE_OPT_NODASH))
 286                         continue;
 287                 if (options->short_name == arg[0] && arg[1] == '\0')
 288                         return get_value(p, options, OPT_SHORT);
 289         }
 290         return -2;
 291 }
 292
 293 static void check_typos(const char *arg, const struct option *options)
 294 {
 295         if (strlen(arg) < 3)
 296                 return;
 297
 298         if (!prefixcmp(arg, "no-")) {
 299                 error ("did you mean `--%s` (with two dashes ?)", arg);
 300                 exit(129);
 301         }
 302
 303         for (; options->type != OPTION_END; options++) {
 304                 if (!options->long_name)
 305                         continue;
 306                 if (!prefixcmp(options->long_name, arg)) {
 307                         error ("did you mean `--%s` (with two dashes ?)", arg);
 308                         exit(129);
 309                 }
 310         }
 311 }
 312
 313 static void parse_options_check(const struct option *opts)
 314 {
 315         int err = 0;
 316
 317         for (; opts->type != OPTION_END; opts++) {
 318                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 319                     (opts->flags & PARSE_OPT_OPTARG))
 320                         err |= optbug(opts, "uses incompatible flags "
 321                                         "LASTARG_DEFAULT and OPTARG");
 322                 if (opts->flags & PARSE_OPT_NODASH &&
 323                     ((opts->flags & PARSE_OPT_OPTARG) ||
 324                      !(opts->flags & PARSE_OPT_NOARG) ||
 325                      !(opts->flags & PARSE_OPT_NONEG) ||
 326                      opts->long_name))
 327                         err |= optbug(opts, "uses feature "
 328                                         "not supported for dashless options");
 329                 switch (opts->type) {
 330                 case OPTION_COUNTUP:
 331                 case OPTION_BIT:
 332                 case OPTION_NEGBIT:
 333                 case OPTION_SET_INT:
 334                 case OPTION_SET_PTR:
 335                 case OPTION_NUMBER:
 336                         if ((opts->flags & PARSE_OPT_OPTARG) ||
 337                             !(opts->flags & PARSE_OPT_NOARG))
 338                                 err |= optbug(opts, "should not accept an argument");
 339                 default:
 340                         ; /* ok. (usually accepts an argument) */
 341                 }
 342         }
 343         if (err)
 344                 exit(128);
 345 }
 346
 347 void parse_options_start(struct parse_opt_ctx_t *ctx,
 348                          int argc, const char **argv, const char *prefix,
 349                          const struct option *options, int flags)
 350 {
 351         memset(ctx, 0, sizeof(*ctx));
 352         ctx->argc = argc - 1;
 353         ctx->argv = argv + 1;
 354         ctx->out  = argv;
 355         ctx->prefix = prefix;
 356         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 357         ctx->flags = flags;
 358         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 359             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 360                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 361         parse_options_check(options);
 362 }
 363
 364 static int usage_with_options_internal(struct parse_opt_ctx_t *,
 365                                        const char * const *,
 366                                        const struct option *, int, int);
 367
 368 int parse_options_step(struct parse_opt_ctx_t *ctx,
 369                        const struct option *options,
 370                        const char * const usagestr[])
 371 {
 372         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 373
 374         /* we must reset ->opt, unknown short option leave it dangling */
 375         ctx->opt = NULL;
 376
 377         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 378                 const char *arg = ctx->argv[0];
 379
 380                 if (*arg != '-' || !arg[1]) {
 381                         if (parse_nodash_opt(ctx, arg, options) == 0)
 382                                 continue;
 383                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 384                                 return PARSE_OPT_NON_OPTION;
 385                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 386                         continue;
 387                 }
 388
 389                 if (arg[1] != '-') {
 390                         ctx->opt = arg + 1;
 391                         if (internal_help && *ctx->opt == 'h')
 392                                 return parse_options_usage(ctx, usagestr, options, 0);
 393                         switch (parse_short_opt(ctx, options)) {
 394                         case -1:
 395                                 return parse_options_usage(ctx, usagestr, options, 1);
 396                         case -2:
 397                                 if (ctx->opt)
 398                                         check_typos(arg + 1, options);
 399                                 goto unknown;
 400                         }
 401                         if (ctx->opt)
 402                                 check_typos(arg + 1, options);
 403                         while (ctx->opt) {
 404                                 if (internal_help && *ctx->opt == 'h')
 405                                         return parse_options_usage(ctx, usagestr, options, 0);
 406                                 switch (parse_short_opt(ctx, options)) {
 407                                 case -1:
 408                                         return parse_options_usage(ctx, usagestr, options, 1);
 409                                 case -2:
 410                                         /* fake a short option thing to hide the fact that we may have
 411                                          * started to parse aggregated stuff
 412                                          *
 413                                          * This is leaky, too bad.
 414                                          */
 415                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 416                                         *(char *)ctx->argv[0] = '-';
 417                                         goto unknown;
 418                                 }
 419                         }
 420                         continue;
 421                 }
 422
 423                 if (!arg[2]) { /* "--" */
 424                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 425                                 ctx->argc--;
 426                                 ctx->argv++;
 427                         }
 428                         break;
 429                 }
 430
 431                 if (internal_help && !strcmp(arg + 2, "help-all"))
 432                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 433                 if (internal_help && !strcmp(arg + 2, "help"))
 434                         return parse_options_usage(ctx, usagestr, options, 0);
 435                 switch (parse_long_opt(ctx, arg + 2, options)) {
 436                 case -1:
 437                         return parse_options_usage(ctx, usagestr, options, 1);
 438                 case -2:
 439                         goto unknown;
 440                 }
 441                 continue;
 442 unknown:
 443                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 444                         return PARSE_OPT_UNKNOWN;
 445                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 446                 ctx->opt = NULL;
 447         }
 448         return PARSE_OPT_DONE;
 449 }
 450
 451 int parse_options_end(struct parse_opt_ctx_t *ctx)
 452 {
 453         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 454         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 455         return ctx->cpidx + ctx->argc;
 456 }
 457
 458 int parse_options(int argc, const char **argv, const char *prefix,
 459                   const struct option *options, const char * const usagestr[],
 460                   int flags)
 461 {
 462         struct parse_opt_ctx_t ctx;
 463
 464         parse_options_start(&ctx, argc, argv, prefix, options, flags);
 465         switch (parse_options_step(&ctx, options, usagestr)) {
 466         case PARSE_OPT_HELP:
 467                 exit(129);
 468         case PARSE_OPT_NON_OPTION:
 469         case PARSE_OPT_DONE:
 470                 break;
 471         default: /* PARSE_OPT_UNKNOWN */
 472                 if (ctx.argv[0][1] == '-') {
 473                         error("unknown option `%s'", ctx.argv[0] + 2);
 474                 } else {
 475                         error("unknown switch `%c'", *ctx.opt);
 476                 }
 477                 usage_with_options(usagestr, options);
 478         }
 479
 480         precompose_argv(argc, argv);
 481         return parse_options_end(&ctx);
 482 }
 483
 484 static int usage_argh(const struct option *opts, FILE *outfile)
 485 {
 486         const char *s;
 487         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 488         if (opts->flags & PARSE_OPT_OPTARG)
 489                 if (opts->long_name)
 490                         s = literal ? "[=%s]" : "[=<%s>]";
 491                 else
 492                         s = literal ? "[%s]" : "[<%s>]";
 493         else
 494                 s = literal ? " %s" : " <%s>";
 495         return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
 496 }
 497
 498 #define USAGE_OPTS_WIDTH 24
 499 #define USAGE_GAP         2
 500
 501 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 502                                        const char * const *usagestr,
 503                                        const struct option *opts, int full, int err)
 504 {
 505         FILE *outfile = err ? stderr : stdout;
 506
 507         if (!usagestr)
 508                 return PARSE_OPT_HELP;
 509
 510         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 511                 fprintf(outfile, "cat <<\\EOF\n");
 512
 513         fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
 514         while (*usagestr && **usagestr)
 515                 /* TRANSLATORS: the colon here should align with the
 516                    one in "usage: %s" translation */
 517                 fprintf_ln(outfile, _("   or: %s"), _(*usagestr++));
 518         while (*usagestr) {
 519                 if (**usagestr)
 520                         fprintf_ln(outfile, _("    %s"), _(*usagestr));
 521                 else
 522                         putchar('\n');
 523                 usagestr++;
 524         }
 525
 526         if (opts->type != OPTION_GROUP)
 527                 fputc('\n', outfile);
 528
 529         for (; opts->type != OPTION_END; opts++) {
 530                 size_t pos;
 531                 int pad;
 532
 533                 if (opts->type == OPTION_GROUP) {
 534                         fputc('\n', outfile);
 535                         if (*opts->help)
 536                                 fprintf(outfile, "%s\n", _(opts->help));
 537                         continue;
 538                 }
 539                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 540                         continue;
 541
 542                 pos = fprintf(outfile, "    ");
 543                 if (opts->short_name) {
 544                         if (opts->flags & PARSE_OPT_NODASH)
 545                                 pos += fprintf(outfile, "%c", opts->short_name);
 546                         else
 547                                 pos += fprintf(outfile, "-%c", opts->short_name);
 548                 }
 549                 if (opts->long_name && opts->short_name)
 550                         pos += fprintf(outfile, ", ");
 551                 if (opts->long_name)
 552                         pos += fprintf(outfile, "--%s", opts->long_name);
 553                 if (opts->type == OPTION_NUMBER)
 554                         pos += utf8_fprintf(outfile, _("-NUM"));
 555
 556                 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 557                     !(opts->flags & PARSE_OPT_NOARG))
 558                         pos += usage_argh(opts, outfile);
 559
 560                 if (pos <= USAGE_OPTS_WIDTH)
 561                         pad = USAGE_OPTS_WIDTH - pos;
 562                 else {
 563                         fputc('\n', outfile);
 564                         pad = USAGE_OPTS_WIDTH;
 565                 }
 566                 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
 567         }
 568         fputc('\n', outfile);
 569
 570         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 571                 fputs("EOF\n", outfile);
 572
 573         return PARSE_OPT_HELP;
 574 }
 575
 576 void NORETURN usage_with_options(const char * const *usagestr,
 577                         const struct option *opts)
 578 {
 579         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 580         exit(129);
 581 }
 582
 583 void NORETURN usage_msg_opt(const char *msg,
 584                    const char * const *usagestr,
 585                    const struct option *options)
 586 {
 587         fprintf(stderr, "%s\n\n", msg);
 588         usage_with_options(usagestr, options);
 589 }
 590
 591 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
 592                                const char * const *usagestr,
 593                                const struct option *opts, int err)
 594 {
 595         return usage_with_options_internal(ctx, usagestr, opts, 0, err);
 596 }
 597