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