parse-options.c

   1 #include "git-compat-util.h"
   2 #include "parse-options.h"
   3 #include "cache.h"
   4 #include "commit.h"
   5
   6 #define OPT_SHORT 1
   7 #define OPT_UNSET 2
   8
   9 static int opterror(const struct option *opt, const char *reason, int flags)
  10 {
  11         if (flags & OPT_SHORT)
  12                 return error("switch `%c' %s", opt->short_name, reason);
  13         if (flags & OPT_UNSET)
  14                 return error("option `no-%s' %s", opt->long_name, reason);
  15         return error("option `%s' %s", opt->long_name, reason);
  16 }
  17
  18 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  19                    int flags, const char **arg)
  20 {
  21         if (p->opt) {
  22                 *arg = p->opt;
  23                 p->opt = NULL;
  24         } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  25                 *arg = (const char *)opt->defval;
  26         } else if (p->argc > 1) {
  27                 p->argc--;
  28                 *arg = *++p->argv;
  29         } else
  30                 return opterror(opt, "requires a value", flags);
  31         return 0;
  32 }
  33
  34 static void fix_filename(const char *prefix, const char **file)
  35 {
  36         if (!file || !*file || !prefix || is_absolute_path(*file)
  37             || !strcmp("-", *file))
  38                 return;
  39         *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
  40 }
  41
  42 static int get_value(struct parse_opt_ctx_t *p,
  43                      const struct option *opt, int flags)
  44 {
  45         const char *s, *arg;
  46         const int unset = flags & OPT_UNSET;
  47         int err;
  48
  49         if (unset && p->opt)
  50                 return opterror(opt, "takes no value", flags);
  51         if (unset && (opt->flags & PARSE_OPT_NONEG))
  52                 return opterror(opt, "isn't available", flags);
  53
  54         if (!(flags & OPT_SHORT) && p->opt) {
  55                 switch (opt->type) {
  56                 case OPTION_CALLBACK:
  57                         if (!(opt->flags & PARSE_OPT_NOARG))
  58                                 break;
  59                         /* FALLTHROUGH */
  60                 case OPTION_BOOLEAN:
  61                 case OPTION_BIT:
  62                 case OPTION_NEGBIT:
  63                 case OPTION_SET_INT:
  64                 case OPTION_SET_PTR:
  65                         return opterror(opt, "takes no value", flags);
  66                 default:
  67                         break;
  68                 }
  69         }
  70
  71         switch (opt->type) {
  72         case OPTION_BIT:
  73                 if (unset)
  74                         *(int *)opt->value &= ~opt->defval;
  75                 else
  76                         *(int *)opt->value |= opt->defval;
  77                 return 0;
  78
  79         case OPTION_NEGBIT:
  80                 if (unset)
  81                         *(int *)opt->value |= opt->defval;
  82                 else
  83                         *(int *)opt->value &= ~opt->defval;
  84                 return 0;
  85
  86         case OPTION_BOOLEAN:
  87                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  88                 return 0;
  89
  90         case OPTION_SET_INT:
  91                 *(int *)opt->value = unset ? 0 : opt->defval;
  92                 return 0;
  93
  94         case OPTION_SET_PTR:
  95                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
  96                 return 0;
  97
  98         case OPTION_STRING:
  99                 if (unset)
 100                         *(const char **)opt->value = NULL;
 101                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 102                         *(const char **)opt->value = (const char *)opt->defval;
 103                 else
 104                         return get_arg(p, opt, flags, (const char **)opt->value);
 105                 return 0;
 106
 107         case OPTION_FILENAME:
 108                 err = 0;
 109                 if (unset)
 110                         *(const char **)opt->value = NULL;
 111                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 112                         *(const char **)opt->value = (const char *)opt->defval;
 113                 else
 114                         err = get_arg(p, opt, flags, (const char **)opt->value);
 115
 116                 if (!err)
 117                         fix_filename(p->prefix, (const char **)opt->value);
 118                 return err;
 119
 120         case OPTION_CALLBACK:
 121                 if (unset)
 122                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 123                 if (opt->flags & PARSE_OPT_NOARG)
 124                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 125                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 126                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 127                 if (get_arg(p, opt, flags, &arg))
 128                         return -1;
 129                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 130
 131         case OPTION_INTEGER:
 132                 if (unset) {
 133                         *(int *)opt->value = 0;
 134                         return 0;
 135                 }
 136                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 137                         *(int *)opt->value = opt->defval;
 138                         return 0;
 139                 }
 140                 if (get_arg(p, opt, flags, &arg))
 141                         return -1;
 142                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 143                 if (*s)
 144                         return opterror(opt, "expects a numerical value", flags);
 145                 return 0;
 146
 147         default:
 148                 die("should not happen, someone must be hit on the forehead");
 149         }
 150 }
 151
 152 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 153 {
 154         const struct option *numopt = NULL;
 155
 156         for (; options->type != OPTION_END; options++) {
 157                 if (options->short_name == *p->opt) {
 158                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 159                         return get_value(p, options, OPT_SHORT);
 160                 }
 161
 162                 /*
 163                  * Handle the numerical option later, explicit one-digit
 164                  * options take precedence over it.
 165                  */
 166                 if (options->type == OPTION_NUMBER)
 167                         numopt = options;
 168         }
 169         if (numopt && isdigit(*p->opt)) {
 170                 size_t len = 1;
 171                 char *arg;
 172                 int rc;
 173
 174                 while (isdigit(p->opt[len]))
 175                         len++;
 176                 arg = xmemdupz(p->opt, len);
 177                 p->opt = p->opt[len] ? p->opt + len : NULL;
 178                 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 179                 free(arg);
 180                 return rc;
 181         }
 182         return -2;
 183 }
 184
 185 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 186                           const struct option *options)
 187 {
 188         const char *arg_end = strchr(arg, '=');
 189         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 190         int abbrev_flags = 0, ambiguous_flags = 0;
 191
 192         if (!arg_end)
 193                 arg_end = arg + strlen(arg);
 194
 195         for (; options->type != OPTION_END; options++) {
 196                 const char *rest;
 197                 int flags = 0;
 198
 199                 if (!options->long_name)
 200                         continue;
 201
 202                 rest = skip_prefix(arg, options->long_name);
 203                 if (options->type == OPTION_ARGUMENT) {
 204                         if (!rest)
 205                                 continue;
 206                         if (*rest == '=')
 207                                 return opterror(options, "takes no value", flags);
 208                         if (*rest)
 209                                 continue;
 210                         p->out[p->cpidx++] = arg - 2;
 211                         return 0;
 212                 }
 213                 if (!rest) {
 214                         /* abbreviated? */
 215                         if (!strncmp(options->long_name, arg, arg_end - arg)) {
 216 is_abbreviated:
 217                                 if (abbrev_option) {
 218                                         /*
 219                                          * If this is abbreviated, it is
 220                                          * ambiguous. So when there is no
 221                                          * exact match later, we need to
 222                                          * error out.
 223                                          */
 224                                         ambiguous_option = abbrev_option;
 225                                         ambiguous_flags = abbrev_flags;
 226                                 }
 227                                 if (!(flags & OPT_UNSET) && *arg_end)
 228                                         p->opt = arg_end + 1;
 229                                 abbrev_option = options;
 230                                 abbrev_flags = flags;
 231                                 continue;
 232                         }
 233                         /* negated and abbreviated very much? */
 234                         if (!prefixcmp("no-", arg)) {
 235                                 flags |= OPT_UNSET;
 236                                 goto is_abbreviated;
 237                         }
 238                         /* negated? */
 239                         if (strncmp(arg, "no-", 3))
 240                                 continue;
 241                         flags |= OPT_UNSET;
 242                         rest = skip_prefix(arg + 3, options->long_name);
 243                         /* abbreviated and negated? */
 244                         if (!rest && !prefixcmp(options->long_name, arg + 3))
 245                                 goto is_abbreviated;
 246                         if (!rest)
 247                                 continue;
 248                 }
 249                 if (*rest) {
 250                         if (*rest != '=')
 251                                 continue;
 252                         p->opt = rest + 1;
 253                 }
 254                 return get_value(p, options, flags);
 255         }
 256
 257         if (ambiguous_option)
 258                 return error("Ambiguous option: %s "
 259                         "(could be --%s%s or --%s%s)",
 260                         arg,
 261                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 262                         ambiguous_option->long_name,
 263                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 264                         abbrev_option->long_name);
 265         if (abbrev_option)
 266                 return get_value(p, abbrev_option, abbrev_flags);
 267         return -2;
 268 }
 269
 270 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 271                             const struct option *options)
 272 {
 273         for (; options->type != OPTION_END; options++) {
 274                 if (!(options->flags & PARSE_OPT_NODASH))
 275                         continue;
 276                 if ((options->flags & PARSE_OPT_OPTARG) ||
 277                     !(options->flags & PARSE_OPT_NOARG))
 278                         die("BUG: dashless options don't support arguments");
 279                 if (!(options->flags & PARSE_OPT_NONEG))
 280                         die("BUG: dashless options don't support negation");
 281                 if (options->long_name)
 282                         die("BUG: dashless options can't be long");
 283                 if (options->short_name == arg[0] && arg[1] == '\0')
 284                         return get_value(p, options, OPT_SHORT);
 285         }
 286         return -2;
 287 }
 288
 289 static void check_typos(const char *arg, const struct option *options)
 290 {
 291         if (strlen(arg) < 3)
 292                 return;
 293
 294         if (!prefixcmp(arg, "no-")) {
 295                 error ("did you mean `--%s` (with two dashes ?)", arg);
 296                 exit(129);
 297         }
 298
 299         for (; options->type != OPTION_END; options++) {
 300                 if (!options->long_name)
 301                         continue;
 302                 if (!prefixcmp(options->long_name, arg)) {
 303                         error ("did you mean `--%s` (with two dashes ?)", arg);
 304                         exit(129);
 305                 }
 306         }
 307 }
 308
 309 static void parse_options_check(const struct option *opts)
 310 {
 311         int err = 0;
 312
 313         for (; opts->type != OPTION_END; opts++) {
 314                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 315                     (opts->flags & PARSE_OPT_OPTARG)) {
 316                         if (opts->long_name) {
 317                                 error("`--%s` uses incompatible flags "
 318                                       "LASTARG_DEFAULT and OPTARG", opts->long_name);
 319                         } else {
 320                                 error("`-%c` uses incompatible flags "
 321                                       "LASTARG_DEFAULT and OPTARG", opts->short_name);
 322                         }
 323                         err |= 1;
 324                 }
 325         }
 326
 327         if (err)
 328                 exit(129);
 329 }
 330
 331 void parse_options_start(struct parse_opt_ctx_t *ctx,
 332                          int argc, const char **argv, const char *prefix,
 333                          int flags)
 334 {
 335         memset(ctx, 0, sizeof(*ctx));
 336         ctx->argc = argc - 1;
 337         ctx->argv = argv + 1;
 338         ctx->out  = argv;
 339         ctx->prefix = prefix;
 340         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 341         ctx->flags = flags;
 342         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 343             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 344                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 345 }
 346
 347 static int usage_with_options_internal(const char * const *,
 348                                        const struct option *, int);
 349
 350 int parse_options_step(struct parse_opt_ctx_t *ctx,
 351                        const struct option *options,
 352                        const char * const usagestr[])
 353 {
 354         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 355
 356         parse_options_check(options);
 357
 358         /* we must reset ->opt, unknown short option leave it dangling */
 359         ctx->opt = NULL;
 360
 361         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 362                 const char *arg = ctx->argv[0];
 363
 364                 if (*arg != '-' || !arg[1]) {
 365                         if (parse_nodash_opt(ctx, arg, options) == 0)
 366                                 continue;
 367                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 368                                 break;
 369                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 370                         continue;
 371                 }
 372
 373                 if (arg[1] != '-') {
 374                         ctx->opt = arg + 1;
 375                         if (internal_help && *ctx->opt == 'h')
 376                                 return parse_options_usage(usagestr, options);
 377                         switch (parse_short_opt(ctx, options)) {
 378                         case -1:
 379                                 return parse_options_usage(usagestr, options);
 380                         case -2:
 381                                 goto unknown;
 382                         }
 383                         if (ctx->opt)
 384                                 check_typos(arg + 1, options);
 385                         while (ctx->opt) {
 386                                 if (internal_help && *ctx->opt == 'h')
 387                                         return parse_options_usage(usagestr, options);
 388                                 switch (parse_short_opt(ctx, options)) {
 389                                 case -1:
 390                                         return parse_options_usage(usagestr, options);
 391                                 case -2:
 392                                         /* fake a short option thing to hide the fact that we may have
 393                                          * started to parse aggregated stuff
 394                                          *
 395                                          * This is leaky, too bad.
 396                                          */
 397                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 398                                         *(char *)ctx->argv[0] = '-';
 399                                         goto unknown;
 400                                 }
 401                         }
 402                         continue;
 403                 }
 404
 405                 if (!arg[2]) { /* "--" */
 406                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 407                                 ctx->argc--;
 408                                 ctx->argv++;
 409                         }
 410                         break;
 411                 }
 412
 413                 if (internal_help && !strcmp(arg + 2, "help-all"))
 414                         return usage_with_options_internal(usagestr, options, 1);
 415                 if (internal_help && !strcmp(arg + 2, "help"))
 416                         return parse_options_usage(usagestr, options);
 417                 switch (parse_long_opt(ctx, arg + 2, options)) {
 418                 case -1:
 419                         return parse_options_usage(usagestr, options);
 420                 case -2:
 421                         goto unknown;
 422                 }
 423                 continue;
 424 unknown:
 425                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 426                         return PARSE_OPT_UNKNOWN;
 427                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 428                 ctx->opt = NULL;
 429         }
 430         return PARSE_OPT_DONE;
 431 }
 432
 433 int parse_options_end(struct parse_opt_ctx_t *ctx)
 434 {
 435         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 436         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 437         return ctx->cpidx + ctx->argc;
 438 }
 439
 440 int parse_options(int argc, const char **argv, const char *prefix,
 441                   const struct option *options, const char * const usagestr[],
 442                   int flags)
 443 {
 444         struct parse_opt_ctx_t ctx;
 445
 446         parse_options_start(&ctx, argc, argv, prefix, flags);
 447         switch (parse_options_step(&ctx, options, usagestr)) {
 448         case PARSE_OPT_HELP:
 449                 exit(129);
 450         case PARSE_OPT_DONE:
 451                 break;
 452         default: /* PARSE_OPT_UNKNOWN */
 453                 if (ctx.argv[0][1] == '-') {
 454                         error("unknown option `%s'", ctx.argv[0] + 2);
 455                 } else {
 456                         error("unknown switch `%c'", *ctx.opt);
 457                 }
 458                 usage_with_options(usagestr, options);
 459         }
 460
 461         return parse_options_end(&ctx);
 462 }
 463
 464 static int usage_argh(const struct option *opts)
 465 {
 466         const char *s;
 467         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 468         if (opts->flags & PARSE_OPT_OPTARG)
 469                 if (opts->long_name)
 470                         s = literal ? "[=%s]" : "[=<%s>]";
 471                 else
 472                         s = literal ? "[%s]" : "[<%s>]";
 473         else
 474                 s = literal ? " %s" : " <%s>";
 475         return fprintf(stderr, s, opts->argh ? opts->argh : "...");
 476 }
 477
 478 #define USAGE_OPTS_WIDTH 24
 479 #define USAGE_GAP         2
 480
 481 static int usage_with_options_internal(const char * const *usagestr,
 482                                 const struct option *opts, int full)
 483 {
 484         if (!usagestr)
 485                 return PARSE_OPT_HELP;
 486
 487         fprintf(stderr, "usage: %s\n", *usagestr++);
 488         while (*usagestr && **usagestr)
 489                 fprintf(stderr, "   or: %s\n", *usagestr++);
 490         while (*usagestr) {
 491                 fprintf(stderr, "%s%s\n",
 492                                 **usagestr ? "    " : "",
 493                                 *usagestr);
 494                 usagestr++;
 495         }
 496
 497         if (opts->type != OPTION_GROUP)
 498                 fputc('\n', stderr);
 499
 500         for (; opts->type != OPTION_END; opts++) {
 501                 size_t pos;
 502                 int pad;
 503
 504                 if (opts->type == OPTION_GROUP) {
 505                         fputc('\n', stderr);
 506                         if (*opts->help)
 507                                 fprintf(stderr, "%s\n", opts->help);
 508                         continue;
 509                 }
 510                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 511                         continue;
 512
 513                 pos = fprintf(stderr, "    ");
 514                 if (opts->short_name && !(opts->flags & PARSE_OPT_NEGHELP)) {
 515                         if (opts->flags & PARSE_OPT_NODASH)
 516                                 pos += fprintf(stderr, "%c", opts->short_name);
 517                         else
 518                                 pos += fprintf(stderr, "-%c", opts->short_name);
 519                 }
 520                 if (opts->long_name && opts->short_name)
 521                         pos += fprintf(stderr, ", ");
 522                 if (opts->long_name)
 523                         pos += fprintf(stderr, "--%s%s",
 524                                 (opts->flags & PARSE_OPT_NEGHELP) ?  "no-" : "",
 525                                 opts->long_name);
 526                 if (opts->type == OPTION_NUMBER)
 527                         pos += fprintf(stderr, "-NUM");
 528
 529                 if (!(opts->flags & PARSE_OPT_NOARG))
 530                         pos += usage_argh(opts);
 531
 532                 if (pos <= USAGE_OPTS_WIDTH)
 533                         pad = USAGE_OPTS_WIDTH - pos;
 534                 else {
 535                         fputc('\n', stderr);
 536                         pad = USAGE_OPTS_WIDTH;
 537                 }
 538                 fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 539         }
 540         fputc('\n', stderr);
 541
 542         return PARSE_OPT_HELP;
 543 }
 544
 545 void usage_with_options(const char * const *usagestr,
 546                         const struct option *opts)
 547 {
 548         usage_with_options_internal(usagestr, opts, 0);
 549         exit(129);
 550 }
 551
 552 void usage_msg_opt(const char *msg,
 553                    const char * const *usagestr,
 554                    const struct option *options)
 555 {
 556         fprintf(stderr, "%s\n\n", msg);
 557         usage_with_options(usagestr, options);
 558 }
 559
 560 int parse_options_usage(const char * const *usagestr,
 561                         const struct option *opts)
 562 {
 563         return usage_with_options_internal(usagestr, opts, 0);
 564 }
 565
 566
 567 /*----- some often used options -----*/
 568 #include "cache.h"
 569
 570 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 571 {
 572         int v;
 573
 574         if (!arg) {
 575                 v = unset ? 0 : DEFAULT_ABBREV;
 576         } else {
 577                 v = strtol(arg, (char **)&arg, 10);
 578                 if (*arg)
 579                         return opterror(opt, "expects a numerical value", 0);
 580                 if (v && v < MINIMUM_ABBREV)
 581                         v = MINIMUM_ABBREV;
 582                 else if (v > 40)
 583                         v = 40;
 584         }
 585         *(int *)(opt->value) = v;
 586         return 0;
 587 }
 588
 589 int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
 590                              int unset)
 591 {
 592         *(unsigned long *)(opt->value) = approxidate(arg);
 593         return 0;
 594 }
 595
 596 int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
 597                            int unset)
 598 {
 599         int *target = opt->value;
 600
 601         if (unset)
 602                 /* --no-quiet, --no-verbose */
 603                 *target = 0;
 604         else if (opt->short_name == 'v') {
 605                 if (*target >= 0)
 606                         (*target)++;
 607                 else
 608                         *target = 1;
 609         } else {
 610                 if (*target <= 0)
 611                         (*target)--;
 612                 else
 613                         *target = -1;
 614         }
 615         return 0;
 616 }
 617
 618 int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
 619 {
 620         unsigned char sha1[20];
 621         struct commit *commit;
 622
 623         if (!arg)
 624                 return -1;
 625         if (get_sha1(arg, sha1))
 626                 return error("malformed object name %s", arg);
 627         commit = lookup_commit_reference(sha1);
 628         if (!commit)
 629                 return error("no such commit %s", arg);
 630         commit_list_insert(commit, opt->value);
 631         return 0;
 632 }