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