parse-options.c

   1 #include "git-compat-util.h"
   2 #include "parse-options.h"
   3 #include "cache.h"
   4
   5 #define OPT_SHORT 1
   6 #define OPT_UNSET 2
   7
   8 static inline const char *skip_prefix(const char *str, const char *prefix)
   9 {
  10         size_t len = strlen(prefix);
  11         return strncmp(str, prefix, len) ? NULL : str + len;
  12 }
  13
  14 static int opterror(const struct option *opt, const char *reason, int flags)
  15 {
  16         if (flags & OPT_SHORT)
  17                 return error("switch `%c' %s", opt->short_name, reason);
  18         if (flags & OPT_UNSET)
  19                 return error("option `no-%s' %s", opt->long_name, reason);
  20         return error("option `%s' %s", opt->long_name, reason);
  21 }
  22
  23 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  24                    int flags, const char **arg)
  25 {
  26         if (p->opt) {
  27                 *arg = p->opt;
  28                 p->opt = NULL;
  29         } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  30                 *arg = (const char *)opt->defval;
  31         } else if (p->argc) {
  32                 p->argc--;
  33                 *arg = *++p->argv;
  34         } else
  35                 return opterror(opt, "requires a value", flags);
  36         return 0;
  37 }
  38
  39 static int get_value(struct parse_opt_ctx_t *p,
  40                      const struct option *opt, int flags)
  41 {
  42         const char *s, *arg;
  43         const int unset = flags & OPT_UNSET;
  44
  45         if (unset && p->opt)
  46                 return opterror(opt, "takes no value", flags);
  47         if (unset && (opt->flags & PARSE_OPT_NONEG))
  48                 return opterror(opt, "isn't available", flags);
  49
  50         if (!(flags & OPT_SHORT) && p->opt) {
  51                 switch (opt->type) {
  52                 case OPTION_CALLBACK:
  53                         if (!(opt->flags & PARSE_OPT_NOARG))
  54                                 break;
  55                         /* FALLTHROUGH */
  56                 case OPTION_BOOLEAN:
  57                 case OPTION_BIT:
  58                 case OPTION_SET_INT:
  59                 case OPTION_SET_PTR:
  60                         return opterror(opt, "takes no value", flags);
  61                 default:
  62                         break;
  63                 }
  64         }
  65
  66         switch (opt->type) {
  67         case OPTION_BIT:
  68                 if (unset)
  69                         *(int *)opt->value &= ~opt->defval;
  70                 else
  71                         *(int *)opt->value |= opt->defval;
  72                 return 0;
  73
  74         case OPTION_BOOLEAN:
  75                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  76                 return 0;
  77
  78         case OPTION_SET_INT:
  79                 *(int *)opt->value = unset ? 0 : opt->defval;
  80                 return 0;
  81
  82         case OPTION_SET_PTR:
  83                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
  84                 return 0;
  85
  86         case OPTION_STRING:
  87                 if (unset)
  88                         *(const char **)opt->value = NULL;
  89                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
  90                         *(const char **)opt->value = (const char *)opt->defval;
  91                 else
  92                         return get_arg(p, opt, flags, (const char **)opt->value);
  93                 return 0;
  94
  95         case OPTION_CALLBACK:
  96                 if (unset)
  97                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
  98                 if (opt->flags & PARSE_OPT_NOARG)
  99                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 100                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 101                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 102                 if (get_arg(p, opt, flags, &arg))
 103                         return -1;
 104                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 105
 106         case OPTION_INTEGER:
 107                 if (unset) {
 108                         *(int *)opt->value = 0;
 109                         return 0;
 110                 }
 111                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 112                         *(int *)opt->value = opt->defval;
 113                         return 0;
 114                 }
 115                 if (get_arg(p, opt, flags, &arg))
 116                         return -1;
 117                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 118                 if (*s)
 119                         return opterror(opt, "expects a numerical value", flags);
 120                 return 0;
 121
 122         default:
 123                 die("should not happen, someone must be hit on the forehead");
 124         }
 125 }
 126
 127 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 128 {
 129         for (; options->type != OPTION_END; options++) {
 130                 if (options->short_name == *p->opt) {
 131                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 132                         return get_value(p, options, OPT_SHORT);
 133                 }
 134         }
 135         return -2;
 136 }
 137
 138 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 139                           const struct option *options)
 140 {
 141         const char *arg_end = strchr(arg, '=');
 142         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 143         int abbrev_flags = 0, ambiguous_flags = 0;
 144
 145         if (!arg_end)
 146                 arg_end = arg + strlen(arg);
 147
 148         for (; options->type != OPTION_END; options++) {
 149                 const char *rest;
 150                 int flags = 0;
 151
 152                 if (!options->long_name)
 153                         continue;
 154
 155                 rest = skip_prefix(arg, options->long_name);
 156                 if (options->type == OPTION_ARGUMENT) {
 157                         if (!rest)
 158                                 continue;
 159                         if (*rest == '=')
 160                                 return opterror(options, "takes no value", flags);
 161                         if (*rest)
 162                                 continue;
 163                         p->out[p->cpidx++] = arg - 2;
 164                         return 0;
 165                 }
 166                 if (!rest) {
 167                         /* abbreviated? */
 168                         if (!strncmp(options->long_name, arg, arg_end - arg)) {
 169 is_abbreviated:
 170                                 if (abbrev_option) {
 171                                         /*
 172                                          * If this is abbreviated, it is
 173                                          * ambiguous. So when there is no
 174                                          * exact match later, we need to
 175                                          * error out.
 176                                          */
 177                                         ambiguous_option = abbrev_option;
 178                                         ambiguous_flags = abbrev_flags;
 179                                 }
 180                                 if (!(flags & OPT_UNSET) && *arg_end)
 181                                         p->opt = arg_end + 1;
 182                                 abbrev_option = options;
 183                                 abbrev_flags = flags;
 184                                 continue;
 185                         }
 186                         /* negated and abbreviated very much? */
 187                         if (!prefixcmp("no-", arg)) {
 188                                 flags |= OPT_UNSET;
 189                                 goto is_abbreviated;
 190                         }
 191                         /* negated? */
 192                         if (strncmp(arg, "no-", 3))
 193                                 continue;
 194                         flags |= OPT_UNSET;
 195                         rest = skip_prefix(arg + 3, options->long_name);
 196                         /* abbreviated and negated? */
 197                         if (!rest && !prefixcmp(options->long_name, arg + 3))
 198                                 goto is_abbreviated;
 199                         if (!rest)
 200                                 continue;
 201                 }
 202                 if (*rest) {
 203                         if (*rest != '=')
 204                                 continue;
 205                         p->opt = rest + 1;
 206                 }
 207                 return get_value(p, options, flags);
 208         }
 209
 210         if (ambiguous_option)
 211                 return error("Ambiguous option: %s "
 212                         "(could be --%s%s or --%s%s)",
 213                         arg,
 214                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 215                         ambiguous_option->long_name,
 216                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 217                         abbrev_option->long_name);
 218         if (abbrev_option)
 219                 return get_value(p, abbrev_option, abbrev_flags);
 220         return -2;
 221 }
 222
 223 void check_typos(const char *arg, const struct option *options)
 224 {
 225         if (strlen(arg) < 3)
 226                 return;
 227
 228         if (!prefixcmp(arg, "no-")) {
 229                 error ("did you mean `--%s` (with two dashes ?)", arg);
 230                 exit(129);
 231         }
 232
 233         for (; options->type != OPTION_END; options++) {
 234                 if (!options->long_name)
 235                         continue;
 236                 if (!prefixcmp(options->long_name, arg)) {
 237                         error ("did you mean `--%s` (with two dashes ?)", arg);
 238                         exit(129);
 239                 }
 240         }
 241 }
 242
 243 void parse_options_start(struct parse_opt_ctx_t *ctx,
 244                          int argc, const char **argv, int flags)
 245 {
 246         memset(ctx, 0, sizeof(*ctx));
 247         ctx->argc = argc - 1;
 248         ctx->argv = argv + 1;
 249         ctx->out  = argv;
 250         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 251         ctx->flags = flags;
 252 }
 253
 254 static int usage_with_options_internal(const char * const *,
 255                                        const struct option *, int);
 256
 257 int parse_options_step(struct parse_opt_ctx_t *ctx,
 258                        const struct option *options,
 259                        const char * const usagestr[])
 260 {
 261         /* we must reset ->opt, unknown short option leave it dangling */
 262         ctx->opt = NULL;
 263
 264         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 265                 const char *arg = ctx->argv[0];
 266
 267                 if (*arg != '-' || !arg[1]) {
 268                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 269                                 break;
 270                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 271                         continue;
 272                 }
 273
 274                 if (arg[1] != '-') {
 275                         ctx->opt = arg + 1;
 276                         if (*ctx->opt == 'h')
 277                                 return parse_options_usage(usagestr, options);
 278                         switch (parse_short_opt(ctx, options)) {
 279                         case -1:
 280                                 return parse_options_usage(usagestr, options);
 281                         case -2:
 282                                 return PARSE_OPT_UNKNOWN;
 283                         }
 284                         if (ctx->opt)
 285                                 check_typos(arg + 1, options);
 286                         while (ctx->opt) {
 287                                 if (*ctx->opt == 'h')
 288                                         return parse_options_usage(usagestr, options);
 289                                 switch (parse_short_opt(ctx, options)) {
 290                                 case -1:
 291                                         return parse_options_usage(usagestr, options);
 292                                 case -2:
 293                                         /* fake a short option thing to hide the fact that we may have
 294                                          * started to parse aggregated stuff
 295                                          *
 296                                          * This is leaky, too bad.
 297                                          */
 298                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 299                                         *(char *)ctx->argv[0] = '-';
 300                                         return PARSE_OPT_UNKNOWN;
 301                                 }
 302                         }
 303                         continue;
 304                 }
 305
 306                 if (!arg[2]) { /* "--" */
 307                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 308                                 ctx->argc--;
 309                                 ctx->argv++;
 310                         }
 311                         break;
 312                 }
 313
 314                 if (!strcmp(arg + 2, "help-all"))
 315                         return usage_with_options_internal(usagestr, options, 1);
 316                 if (!strcmp(arg + 2, "help"))
 317                         return parse_options_usage(usagestr, options);
 318                 switch (parse_long_opt(ctx, arg + 2, options)) {
 319                 case -1:
 320                         return parse_options_usage(usagestr, options);
 321                 case -2:
 322                         return PARSE_OPT_UNKNOWN;
 323                 }
 324         }
 325         return PARSE_OPT_DONE;
 326 }
 327
 328 int parse_options_end(struct parse_opt_ctx_t *ctx)
 329 {
 330         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 331         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 332         return ctx->cpidx + ctx->argc;
 333 }
 334
 335 int parse_options(int argc, const char **argv, const struct option *options,
 336                   const char * const usagestr[], int flags)
 337 {
 338         struct parse_opt_ctx_t ctx;
 339
 340         parse_options_start(&ctx, argc, argv, flags);
 341         switch (parse_options_step(&ctx, options, usagestr)) {
 342         case PARSE_OPT_HELP:
 343                 exit(129);
 344         case PARSE_OPT_DONE:
 345                 break;
 346         default: /* PARSE_OPT_UNKNOWN */
 347                 if (ctx.argv[0][1] == '-') {
 348                         error("unknown option `%s'", ctx.argv[0] + 2);
 349                 } else {
 350                         error("unknown switch `%c'", *ctx.opt);
 351                 }
 352                 usage_with_options(usagestr, options);
 353         }
 354
 355         return parse_options_end(&ctx);
 356 }
 357
 358 #define USAGE_OPTS_WIDTH 24
 359 #define USAGE_GAP         2
 360
 361 int usage_with_options_internal(const char * const *usagestr,
 362                                 const struct option *opts, int full)
 363 {
 364         fprintf(stderr, "usage: %s\n", *usagestr++);
 365         while (*usagestr && **usagestr)
 366                 fprintf(stderr, "   or: %s\n", *usagestr++);
 367         while (*usagestr) {
 368                 fprintf(stderr, "%s%s\n",
 369                                 **usagestr ? "    " : "",
 370                                 *usagestr);
 371                 usagestr++;
 372         }
 373
 374         if (opts->type != OPTION_GROUP)
 375                 fputc('\n', stderr);
 376
 377         for (; opts->type != OPTION_END; opts++) {
 378                 size_t pos;
 379                 int pad;
 380
 381                 if (opts->type == OPTION_GROUP) {
 382                         fputc('\n', stderr);
 383                         if (*opts->help)
 384                                 fprintf(stderr, "%s\n", opts->help);
 385                         continue;
 386                 }
 387                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 388                         continue;
 389
 390                 pos = fprintf(stderr, "    ");
 391                 if (opts->short_name)
 392                         pos += fprintf(stderr, "-%c", opts->short_name);
 393                 if (opts->long_name && opts->short_name)
 394                         pos += fprintf(stderr, ", ");
 395                 if (opts->long_name)
 396                         pos += fprintf(stderr, "--%s", opts->long_name);
 397
 398                 switch (opts->type) {
 399                 case OPTION_ARGUMENT:
 400                         break;
 401                 case OPTION_INTEGER:
 402                         if (opts->flags & PARSE_OPT_OPTARG)
 403                                 if (opts->long_name)
 404                                         pos += fprintf(stderr, "[=<n>]");
 405                                 else
 406                                         pos += fprintf(stderr, "[<n>]");
 407                         else
 408                                 pos += fprintf(stderr, " <n>");
 409                         break;
 410                 case OPTION_CALLBACK:
 411                         if (opts->flags & PARSE_OPT_NOARG)
 412                                 break;
 413                         /* FALLTHROUGH */
 414                 case OPTION_STRING:
 415                         if (opts->argh) {
 416                                 if (opts->flags & PARSE_OPT_OPTARG)
 417                                         if (opts->long_name)
 418                                                 pos += fprintf(stderr, "[=<%s>]", opts->argh);
 419                                         else
 420                                                 pos += fprintf(stderr, "[<%s>]", opts->argh);
 421                                 else
 422                                         pos += fprintf(stderr, " <%s>", opts->argh);
 423                         } else {
 424                                 if (opts->flags & PARSE_OPT_OPTARG)
 425                                         if (opts->long_name)
 426                                                 pos += fprintf(stderr, "[=...]");
 427                                         else
 428                                                 pos += fprintf(stderr, "[...]");
 429                                 else
 430                                         pos += fprintf(stderr, " ...");
 431                         }
 432                         break;
 433                 default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
 434                         break;
 435                 }
 436
 437                 if (pos <= USAGE_OPTS_WIDTH)
 438                         pad = USAGE_OPTS_WIDTH - pos;
 439                 else {
 440                         fputc('\n', stderr);
 441                         pad = USAGE_OPTS_WIDTH;
 442                 }
 443                 fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 444         }
 445         fputc('\n', stderr);
 446
 447         return PARSE_OPT_HELP;
 448 }
 449
 450 void usage_with_options(const char * const *usagestr,
 451                         const struct option *opts)
 452 {
 453         usage_with_options_internal(usagestr, opts, 0);
 454         exit(129);
 455 }
 456
 457 int parse_options_usage(const char * const *usagestr,
 458                         const struct option *opts)
 459 {
 460         return usage_with_options_internal(usagestr, opts, 0);
 461 }
 462
 463
 464 /*----- some often used options -----*/
 465 #include "cache.h"
 466
 467 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 468 {
 469         int v;
 470
 471         if (!arg) {
 472                 v = unset ? 0 : DEFAULT_ABBREV;
 473         } else {
 474                 v = strtol(arg, (char **)&arg, 10);
 475                 if (*arg)
 476                         return opterror(opt, "expects a numerical value", 0);
 477                 if (v && v < MINIMUM_ABBREV)
 478                         v = MINIMUM_ABBREV;
 479                 else if (v > 40)
 480                         v = 40;
 481         }
 482         *(int *)(opt->value) = v;
 483         return 0;
 484 }
 485
 486 int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
 487                              int unset)
 488 {
 489         *(unsigned long *)(opt->value) = approxidate(arg);
 490         return 0;
 491 }