parse-options.c

   1 #include "git-compat-util.h"
   2 #include "parse-options.h"
   3 #include "cache.h"
   4 #include "config.h"
   5 #include "commit.h"
   6 #include "color.h"
   7 #include "utf8.h"
   8
   9 static int disallow_abbreviated_options;
  10
  11 #define OPT_SHORT 1
  12 #define OPT_UNSET 2
  13
  14 int optbug(const struct option *opt, const char *reason)
  15 {
  16         if (opt->long_name) {
  17                 if (opt->short_name)
  18                         return error("BUG: switch '%c' (--%s) %s",
  19                                      opt->short_name, opt->long_name, reason);
  20                 return error("BUG: option '%s' %s", opt->long_name, reason);
  21         }
  22         return error("BUG: switch '%c' %s", opt->short_name, reason);
  23 }
  24
  25 static enum parse_opt_result get_arg(struct parse_opt_ctx_t *p,
  26                                      const struct option *opt,
  27                                      int flags, const char **arg)
  28 {
  29         if (p->opt) {
  30                 *arg = p->opt;
  31                 p->opt = NULL;
  32         } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  33                 *arg = (const char *)opt->defval;
  34         } else if (p->argc > 1) {
  35                 p->argc--;
  36                 *arg = *++p->argv;
  37         } else
  38                 return error(_("%s requires a value"), optname(opt, flags));
  39         return 0;
  40 }
  41
  42 static void fix_filename(const char *prefix, const char **file)
  43 {
  44         if (!file || !*file || !prefix || is_absolute_path(*file)
  45             || !strcmp("-", *file))
  46                 return;
  47         *file = prefix_filename(prefix, *file);
  48 }
  49
  50 static enum parse_opt_result opt_command_mode_error(
  51         const struct option *opt,
  52         const struct option *all_opts,
  53         int flags)
  54 {
  55         const struct option *that;
  56         struct strbuf that_name = STRBUF_INIT;
  57
  58         /*
  59          * Find the other option that was used to set the variable
  60          * already, and report that this is not compatible with it.
  61          */
  62         for (that = all_opts; that->type != OPTION_END; that++) {
  63                 if (that == opt ||
  64                     that->type != OPTION_CMDMODE ||
  65                     that->value != opt->value ||
  66                     that->defval != *(int *)opt->value)
  67                         continue;
  68
  69                 if (that->long_name)
  70                         strbuf_addf(&that_name, "--%s", that->long_name);
  71                 else
  72                         strbuf_addf(&that_name, "-%c", that->short_name);
  73                 error(_("%s is incompatible with %s"),
  74                       optname(opt, flags), that_name.buf);
  75                 strbuf_release(&that_name);
  76                 return PARSE_OPT_ERROR;
  77         }
  78         return error(_("%s : incompatible with something else"),
  79                      optname(opt, flags));
  80 }
  81
  82 static enum parse_opt_result get_value(struct parse_opt_ctx_t *p,
  83                                        const struct option *opt,
  84                                        const struct option *all_opts,
  85                                        int flags)
  86 {
  87         const char *s, *arg;
  88         const int unset = flags & OPT_UNSET;
  89         int err;
  90
  91         if (unset && p->opt)
  92                 return error(_("%s takes no value"), optname(opt, flags));
  93         if (unset && (opt->flags & PARSE_OPT_NONEG))
  94                 return error(_("%s isn't available"), optname(opt, flags));
  95         if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
  96                 return error(_("%s takes no value"), optname(opt, flags));
  97
  98         switch (opt->type) {
  99         case OPTION_LOWLEVEL_CALLBACK:
 100                 return opt->ll_callback(p, opt, NULL, unset);
 101
 102         case OPTION_BIT:
 103                 if (unset)
 104                         *(int *)opt->value &= ~opt->defval;
 105                 else
 106                         *(int *)opt->value |= opt->defval;
 107                 return 0;
 108
 109         case OPTION_NEGBIT:
 110                 if (unset)
 111                         *(int *)opt->value |= opt->defval;
 112                 else
 113                         *(int *)opt->value &= ~opt->defval;
 114                 return 0;
 115
 116         case OPTION_BITOP:
 117                 if (unset)
 118                         BUG("BITOP can't have unset form");
 119                 *(int *)opt->value &= ~opt->extra;
 120                 *(int *)opt->value |= opt->defval;
 121                 return 0;
 122
 123         case OPTION_COUNTUP:
 124                 if (*(int *)opt->value < 0)
 125                         *(int *)opt->value = 0;
 126                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
 127                 return 0;
 128
 129         case OPTION_SET_INT:
 130                 *(int *)opt->value = unset ? 0 : opt->defval;
 131                 return 0;
 132
 133         case OPTION_CMDMODE:
 134                 /*
 135                  * Giving the same mode option twice, although is unnecessary,
 136                  * is not a grave error, so let it pass.
 137                  */
 138                 if (*(int *)opt->value && *(int *)opt->value != opt->defval)
 139                         return opt_command_mode_error(opt, all_opts, flags);
 140                 *(int *)opt->value = opt->defval;
 141                 return 0;
 142
 143         case OPTION_STRING:
 144                 if (unset)
 145                         *(const char **)opt->value = NULL;
 146                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 147                         *(const char **)opt->value = (const char *)opt->defval;
 148                 else
 149                         return get_arg(p, opt, flags, (const char **)opt->value);
 150                 return 0;
 151
 152         case OPTION_FILENAME:
 153                 err = 0;
 154                 if (unset)
 155                         *(const char **)opt->value = NULL;
 156                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 157                         *(const char **)opt->value = (const char *)opt->defval;
 158                 else
 159                         err = get_arg(p, opt, flags, (const char **)opt->value);
 160
 161                 if (!err)
 162                         fix_filename(p->prefix, (const char **)opt->value);
 163                 return err;
 164
 165         case OPTION_CALLBACK:
 166         {
 167                 const char *p_arg = NULL;
 168                 int p_unset;
 169
 170                 if (unset)
 171                         p_unset = 1;
 172                 else if (opt->flags & PARSE_OPT_NOARG)
 173                         p_unset = 0;
 174                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 175                         p_unset = 0;
 176                 else if (get_arg(p, opt, flags, &arg))
 177                         return -1;
 178                 else {
 179                         p_unset = 0;
 180                         p_arg = arg;
 181                 }
 182                 if (opt->callback)
 183                         return (*opt->callback)(opt, p_arg, p_unset) ? (-1) : 0;
 184                 else
 185                         return (*opt->ll_callback)(p, opt, p_arg, p_unset);
 186         }
 187         case OPTION_INTEGER:
 188                 if (unset) {
 189                         *(int *)opt->value = 0;
 190                         return 0;
 191                 }
 192                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 193                         *(int *)opt->value = opt->defval;
 194                         return 0;
 195                 }
 196                 if (get_arg(p, opt, flags, &arg))
 197                         return -1;
 198                 if (!*arg)
 199                         return error(_("%s expects a numerical value"),
 200                                      optname(opt, flags));
 201                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 202                 if (*s)
 203                         return error(_("%s expects a numerical value"),
 204                                      optname(opt, flags));
 205                 return 0;
 206
 207         case OPTION_MAGNITUDE:
 208                 if (unset) {
 209                         *(unsigned long *)opt->value = 0;
 210                         return 0;
 211                 }
 212                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 213                         *(unsigned long *)opt->value = opt->defval;
 214                         return 0;
 215                 }
 216                 if (get_arg(p, opt, flags, &arg))
 217                         return -1;
 218                 if (!git_parse_ulong(arg, opt->value))
 219                         return error(_("%s expects a non-negative integer value"
 220                                        " with an optional k/m/g suffix"),
 221                                      optname(opt, flags));
 222                 return 0;
 223
 224         default:
 225                 BUG("opt->type %d should not happen", opt->type);
 226         }
 227 }
 228
 229 static enum parse_opt_result parse_short_opt(struct parse_opt_ctx_t *p,
 230                                              const struct option *options)
 231 {
 232         const struct option *all_opts = options;
 233         const struct option *numopt = NULL;
 234
 235         for (; options->type != OPTION_END; options++) {
 236                 if (options->short_name == *p->opt) {
 237                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 238                         return get_value(p, options, all_opts, OPT_SHORT);
 239                 }
 240
 241                 /*
 242                  * Handle the numerical option later, explicit one-digit
 243                  * options take precedence over it.
 244                  */
 245                 if (options->type == OPTION_NUMBER)
 246                         numopt = options;
 247         }
 248         if (numopt && isdigit(*p->opt)) {
 249                 size_t len = 1;
 250                 char *arg;
 251                 int rc;
 252
 253                 while (isdigit(p->opt[len]))
 254                         len++;
 255                 arg = xmemdupz(p->opt, len);
 256                 p->opt = p->opt[len] ? p->opt + len : NULL;
 257                 if (numopt->callback)
 258                         rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 259                 else
 260                         rc = (*numopt->ll_callback)(p, numopt, arg, 0);
 261                 free(arg);
 262                 return rc;
 263         }
 264         return PARSE_OPT_UNKNOWN;
 265 }
 266
 267 static int has_string(const char *it, const char **array)
 268 {
 269         while (*array)
 270                 if (!strcmp(it, *(array++)))
 271                         return 1;
 272         return 0;
 273 }
 274
 275 static int is_alias(struct parse_opt_ctx_t *ctx,
 276                     const struct option *one_opt,
 277                     const struct option *another_opt)
 278 {
 279         const char **group;
 280
 281         if (!ctx->alias_groups)
 282                 return 0;
 283
 284         if (!one_opt->long_name || !another_opt->long_name)
 285                 return 0;
 286
 287         for (group = ctx->alias_groups; *group; group += 3) {
 288                 /* it and other are from the same family? */
 289                 if (has_string(one_opt->long_name, group) &&
 290                     has_string(another_opt->long_name, group))
 291                         return 1;
 292         }
 293         return 0;
 294 }
 295
 296 static enum parse_opt_result parse_long_opt(
 297         struct parse_opt_ctx_t *p, const char *arg,
 298         const struct option *options)
 299 {
 300         const struct option *all_opts = options;
 301         const char *arg_end = strchrnul(arg, '=');
 302         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 303         int abbrev_flags = 0, ambiguous_flags = 0;
 304
 305         for (; options->type != OPTION_END; options++) {
 306                 const char *rest, *long_name = options->long_name;
 307                 int flags = 0, opt_flags = 0;
 308
 309                 if (!long_name)
 310                         continue;
 311
 312 again:
 313                 if (!skip_prefix(arg, long_name, &rest))
 314                         rest = NULL;
 315                 if (options->type == OPTION_ARGUMENT) {
 316                         if (!rest)
 317                                 continue;
 318                         if (*rest == '=')
 319                                 return error(_("%s takes no value"),
 320                                              optname(options, flags));
 321                         if (*rest)
 322                                 continue;
 323                         if (options->value)
 324                                 *(int *)options->value = options->defval;
 325                         p->out[p->cpidx++] = arg - 2;
 326                         return PARSE_OPT_DONE;
 327                 }
 328                 if (!rest) {
 329                         /* abbreviated? */
 330                         if (!(p->flags & PARSE_OPT_KEEP_UNKNOWN) &&
 331                             !strncmp(long_name, arg, arg_end - arg)) {
 332 is_abbreviated:
 333                                 if (abbrev_option &&
 334                                     !is_alias(p, abbrev_option, options)) {
 335                                         /*
 336                                          * If this is abbreviated, it is
 337                                          * ambiguous. So when there is no
 338                                          * exact match later, we need to
 339                                          * error out.
 340                                          */
 341                                         ambiguous_option = abbrev_option;
 342                                         ambiguous_flags = abbrev_flags;
 343                                 }
 344                                 if (!(flags & OPT_UNSET) && *arg_end)
 345                                         p->opt = arg_end + 1;
 346                                 abbrev_option = options;
 347                                 abbrev_flags = flags ^ opt_flags;
 348                                 continue;
 349                         }
 350                         /* negation allowed? */
 351                         if (options->flags & PARSE_OPT_NONEG)
 352                                 continue;
 353                         /* negated and abbreviated very much? */
 354                         if (starts_with("no-", arg)) {
 355                                 flags |= OPT_UNSET;
 356                                 goto is_abbreviated;
 357                         }
 358                         /* negated? */
 359                         if (!starts_with(arg, "no-")) {
 360                                 if (skip_prefix(long_name, "no-", &long_name)) {
 361                                         opt_flags |= OPT_UNSET;
 362                                         goto again;
 363                                 }
 364                                 continue;
 365                         }
 366                         flags |= OPT_UNSET;
 367                         if (!skip_prefix(arg + 3, long_name, &rest)) {
 368                                 /* abbreviated and negated? */
 369                                 if (starts_with(long_name, arg + 3))
 370                                         goto is_abbreviated;
 371                                 else
 372                                         continue;
 373                         }
 374                 }
 375                 if (*rest) {
 376                         if (*rest != '=')
 377                                 continue;
 378                         p->opt = rest + 1;
 379                 }
 380                 return get_value(p, options, all_opts, flags ^ opt_flags);
 381         }
 382
 383         if (disallow_abbreviated_options && (ambiguous_option || abbrev_option))
 384                 die("disallowed abbreviated or ambiguous option '%.*s'",
 385                     (int)(arg_end - arg), arg);
 386
 387         if (ambiguous_option) {
 388                 error(_("ambiguous option: %s "
 389                         "(could be --%s%s or --%s%s)"),
 390                         arg,
 391                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 392                         ambiguous_option->long_name,
 393                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 394                         abbrev_option->long_name);
 395                 return PARSE_OPT_HELP;
 396         }
 397         if (abbrev_option)
 398                 return get_value(p, abbrev_option, all_opts, abbrev_flags);
 399         return PARSE_OPT_UNKNOWN;
 400 }
 401
 402 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 403                             const struct option *options)
 404 {
 405         const struct option *all_opts = options;
 406
 407         for (; options->type != OPTION_END; options++) {
 408                 if (!(options->flags & PARSE_OPT_NODASH))
 409                         continue;
 410                 if (options->short_name == arg[0] && arg[1] == '\0')
 411                         return get_value(p, options, all_opts, OPT_SHORT);
 412         }
 413         return -2;
 414 }
 415
 416 static void check_typos(const char *arg, const struct option *options)
 417 {
 418         if (strlen(arg) < 3)
 419                 return;
 420
 421         if (starts_with(arg, "no-")) {
 422                 error(_("did you mean `--%s` (with two dashes)?"), arg);
 423                 exit(129);
 424         }
 425
 426         for (; options->type != OPTION_END; options++) {
 427                 if (!options->long_name)
 428                         continue;
 429                 if (starts_with(options->long_name, arg)) {
 430                         error(_("did you mean `--%s` (with two dashes)?"), arg);
 431                         exit(129);
 432                 }
 433         }
 434 }
 435
 436 static void parse_options_check(const struct option *opts)
 437 {
 438         int err = 0;
 439         char short_opts[128];
 440
 441         memset(short_opts, '\0', sizeof(short_opts));
 442         for (; opts->type != OPTION_END; opts++) {
 443                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 444                     (opts->flags & PARSE_OPT_OPTARG))
 445                         err |= optbug(opts, "uses incompatible flags "
 446                                         "LASTARG_DEFAULT and OPTARG");
 447                 if (opts->short_name) {
 448                         if (0x7F <= opts->short_name)
 449                                 err |= optbug(opts, "invalid short name");
 450                         else if (short_opts[opts->short_name]++)
 451                                 err |= optbug(opts, "short name already used");
 452                 }
 453                 if (opts->flags & PARSE_OPT_NODASH &&
 454                     ((opts->flags & PARSE_OPT_OPTARG) ||
 455                      !(opts->flags & PARSE_OPT_NOARG) ||
 456                      !(opts->flags & PARSE_OPT_NONEG) ||
 457                      opts->long_name))
 458                         err |= optbug(opts, "uses feature "
 459                                         "not supported for dashless options");
 460                 switch (opts->type) {
 461                 case OPTION_COUNTUP:
 462                 case OPTION_BIT:
 463                 case OPTION_NEGBIT:
 464                 case OPTION_SET_INT:
 465                 case OPTION_NUMBER:
 466                         if ((opts->flags & PARSE_OPT_OPTARG) ||
 467                             !(opts->flags & PARSE_OPT_NOARG))
 468                                 err |= optbug(opts, "should not accept an argument");
 469                         break;
 470                 case OPTION_CALLBACK:
 471                         if (!opts->callback && !opts->ll_callback)
 472                                 BUG("OPTION_CALLBACK needs one callback");
 473                         if (opts->callback && opts->ll_callback)
 474                                 BUG("OPTION_CALLBACK can't have two callbacks");
 475                         break;
 476                 case OPTION_LOWLEVEL_CALLBACK:
 477                         if (!opts->ll_callback)
 478                                 BUG("OPTION_LOWLEVEL_CALLBACK needs a callback");
 479                         if (opts->callback)
 480                                 BUG("OPTION_LOWLEVEL_CALLBACK needs no high level callback");
 481                         break;
 482                 case OPTION_ALIAS:
 483                         BUG("OPT_ALIAS() should not remain at this point. "
 484                             "Are you using parse_options_step() directly?\n"
 485                             "That case is not supported yet.");
 486                 default:
 487                         ; /* ok. (usually accepts an argument) */
 488                 }
 489                 if (opts->argh &&
 490                     strcspn(opts->argh, " _") != strlen(opts->argh))
 491                         err |= optbug(opts, "multi-word argh should use dash to separate words");
 492         }
 493         if (err)
 494                 exit(128);
 495 }
 496
 497 static void parse_options_start_1(struct parse_opt_ctx_t *ctx,
 498                                   int argc, const char **argv, const char *prefix,
 499                                   const struct option *options, int flags)
 500 {
 501         ctx->argc = argc;
 502         ctx->argv = argv;
 503         if (!(flags & PARSE_OPT_ONE_SHOT)) {
 504                 ctx->argc--;
 505                 ctx->argv++;
 506         }
 507         ctx->total = ctx->argc;
 508         ctx->out   = argv;
 509         ctx->prefix = prefix;
 510         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 511         ctx->flags = flags;
 512         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 513             (flags & PARSE_OPT_STOP_AT_NON_OPTION) &&
 514             !(flags & PARSE_OPT_ONE_SHOT))
 515                 BUG("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 516         if ((flags & PARSE_OPT_ONE_SHOT) &&
 517             (flags & PARSE_OPT_KEEP_ARGV0))
 518                 BUG("Can't keep argv0 if you don't have it");
 519         parse_options_check(options);
 520 }
 521
 522 void parse_options_start(struct parse_opt_ctx_t *ctx,
 523                          int argc, const char **argv, const char *prefix,
 524                          const struct option *options, int flags)
 525 {
 526         memset(ctx, 0, sizeof(*ctx));
 527         parse_options_start_1(ctx, argc, argv, prefix, options, flags);
 528 }
 529
 530 static void show_negated_gitcomp(const struct option *opts, int nr_noopts)
 531 {
 532         int printed_dashdash = 0;
 533
 534         for (; opts->type != OPTION_END; opts++) {
 535                 int has_unset_form = 0;
 536                 const char *name;
 537
 538                 if (!opts->long_name)
 539                         continue;
 540                 if (opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE))
 541                         continue;
 542                 if (opts->flags & PARSE_OPT_NONEG)
 543                         continue;
 544
 545                 switch (opts->type) {
 546                 case OPTION_STRING:
 547                 case OPTION_FILENAME:
 548                 case OPTION_INTEGER:
 549                 case OPTION_MAGNITUDE:
 550                 case OPTION_CALLBACK:
 551                 case OPTION_BIT:
 552                 case OPTION_NEGBIT:
 553                 case OPTION_COUNTUP:
 554                 case OPTION_SET_INT:
 555                         has_unset_form = 1;
 556                         break;
 557                 default:
 558                         break;
 559                 }
 560                 if (!has_unset_form)
 561                         continue;
 562
 563                 if (skip_prefix(opts->long_name, "no-", &name)) {
 564                         if (nr_noopts < 0)
 565                                 printf(" --%s", name);
 566                 } else if (nr_noopts >= 0) {
 567                         if (nr_noopts && !printed_dashdash) {
 568                                 printf(" --");
 569                                 printed_dashdash = 1;
 570                         }
 571                         printf(" --no-%s", opts->long_name);
 572                         nr_noopts++;
 573                 }
 574         }
 575 }
 576
 577 static int show_gitcomp(const struct option *opts)
 578 {
 579         const struct option *original_opts = opts;
 580         int nr_noopts = 0;
 581
 582         for (; opts->type != OPTION_END; opts++) {
 583                 const char *suffix = "";
 584
 585                 if (!opts->long_name)
 586                         continue;
 587                 if (opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE))
 588                         continue;
 589
 590                 switch (opts->type) {
 591                 case OPTION_GROUP:
 592                         continue;
 593                 case OPTION_STRING:
 594                 case OPTION_FILENAME:
 595                 case OPTION_INTEGER:
 596                 case OPTION_MAGNITUDE:
 597                 case OPTION_CALLBACK:
 598                         if (opts->flags & PARSE_OPT_NOARG)
 599                                 break;
 600                         if (opts->flags & PARSE_OPT_OPTARG)
 601                                 break;
 602                         if (opts->flags & PARSE_OPT_LASTARG_DEFAULT)
 603                                 break;
 604                         suffix = "=";
 605                         break;
 606                 default:
 607                         break;
 608                 }
 609                 if (opts->flags & PARSE_OPT_COMP_ARG)
 610                         suffix = "=";
 611                 if (starts_with(opts->long_name, "no-"))
 612                         nr_noopts++;
 613                 printf(" --%s%s", opts->long_name, suffix);
 614         }
 615         show_negated_gitcomp(original_opts, -1);
 616         show_negated_gitcomp(original_opts, nr_noopts);
 617         fputc('\n', stdout);
 618         return PARSE_OPT_COMPLETE;
 619 }
 620
 621 /*
 622  * Scan and may produce a new option[] array, which should be used
 623  * instead of the original 'options'.
 624  *
 625  * Right now this is only used to preprocess and substitute
 626  * OPTION_ALIAS.
 627  */
 628 static struct option *preprocess_options(struct parse_opt_ctx_t *ctx,
 629                                          const struct option *options)
 630 {
 631         struct option *newopt;
 632         int i, nr, alias;
 633         int nr_aliases = 0;
 634
 635         for (nr = 0; options[nr].type != OPTION_END; nr++) {
 636                 if (options[nr].type == OPTION_ALIAS)
 637                         nr_aliases++;
 638         }
 639
 640         if (!nr_aliases)
 641                 return NULL;
 642
 643         ALLOC_ARRAY(newopt, nr + 1);
 644         COPY_ARRAY(newopt, options, nr + 1);
 645
 646         /* each alias has two string pointers and NULL */
 647         CALLOC_ARRAY(ctx->alias_groups, 3 * (nr_aliases + 1));
 648
 649         for (alias = 0, i = 0; i < nr; i++) {
 650                 int short_name;
 651                 const char *long_name;
 652                 const char *source;
 653                 int j;
 654
 655                 if (newopt[i].type != OPTION_ALIAS)
 656                         continue;
 657
 658                 short_name = newopt[i].short_name;
 659                 long_name = newopt[i].long_name;
 660                 source = newopt[i].value;
 661
 662                 if (!long_name)
 663                         BUG("An alias must have long option name");
 664
 665                 for (j = 0; j < nr; j++) {
 666                         const char *name = options[j].long_name;
 667
 668                         if (!name || strcmp(name, source))
 669                                 continue;
 670
 671                         if (options[j].type == OPTION_ALIAS)
 672                                 BUG("No please. Nested aliases are not supported.");
 673
 674                         /*
 675                          * NEEDSWORK: this is a bit inconsistent because
 676                          * usage_with_options() on the original options[] will print
 677                          * help string as "alias of %s" but "git cmd -h" will
 678                          * print the original help string.
 679                          */
 680                         memcpy(newopt + i, options + j, sizeof(*newopt));
 681                         newopt[i].short_name = short_name;
 682                         newopt[i].long_name = long_name;
 683                         break;
 684                 }
 685
 686                 if (j == nr)
 687                         BUG("could not find source option '%s' of alias '%s'",
 688                             source, newopt[i].long_name);
 689                 ctx->alias_groups[alias * 3 + 0] = newopt[i].long_name;
 690                 ctx->alias_groups[alias * 3 + 1] = options[j].long_name;
 691                 ctx->alias_groups[alias * 3 + 2] = NULL;
 692                 alias++;
 693         }
 694
 695         return newopt;
 696 }
 697
 698 static int usage_with_options_internal(struct parse_opt_ctx_t *,
 699                                        const char * const *,
 700                                        const struct option *, int, int);
 701
 702 int parse_options_step(struct parse_opt_ctx_t *ctx,
 703                        const struct option *options,
 704                        const char * const usagestr[])
 705 {
 706         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 707
 708         /* we must reset ->opt, unknown short option leave it dangling */
 709         ctx->opt = NULL;
 710
 711         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 712                 const char *arg = ctx->argv[0];
 713
 714                 if (ctx->flags & PARSE_OPT_ONE_SHOT &&
 715                     ctx->argc != ctx->total)
 716                         break;
 717
 718                 if (*arg != '-' || !arg[1]) {
 719                         if (parse_nodash_opt(ctx, arg, options) == 0)
 720                                 continue;
 721                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 722                                 return PARSE_OPT_NON_OPTION;
 723                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 724                         continue;
 725                 }
 726
 727                 /* lone -h asks for help */
 728                 if (internal_help && ctx->total == 1 && !strcmp(arg + 1, "h"))
 729                         goto show_usage;
 730
 731                 /* lone --git-completion-helper is asked by git-completion.bash */
 732                 if (ctx->total == 1 && !strcmp(arg + 1, "-git-completion-helper"))
 733                         return show_gitcomp(options);
 734
 735                 if (arg[1] != '-') {
 736                         ctx->opt = arg + 1;
 737                         switch (parse_short_opt(ctx, options)) {
 738                         case PARSE_OPT_ERROR:
 739                                 return PARSE_OPT_ERROR;
 740                         case PARSE_OPT_UNKNOWN:
 741                                 if (ctx->opt)
 742                                         check_typos(arg + 1, options);
 743                                 if (internal_help && *ctx->opt == 'h')
 744                                         goto show_usage;
 745                                 goto unknown;
 746                         case PARSE_OPT_NON_OPTION:
 747                         case PARSE_OPT_HELP:
 748                         case PARSE_OPT_COMPLETE:
 749                                 BUG("parse_short_opt() cannot return these");
 750                         case PARSE_OPT_DONE:
 751                                 break;
 752                         }
 753                         if (ctx->opt)
 754                                 check_typos(arg + 1, options);
 755                         while (ctx->opt) {
 756                                 switch (parse_short_opt(ctx, options)) {
 757                                 case PARSE_OPT_ERROR:
 758                                         return PARSE_OPT_ERROR;
 759                                 case PARSE_OPT_UNKNOWN:
 760                                         if (internal_help && *ctx->opt == 'h')
 761                                                 goto show_usage;
 762
 763                                         /* fake a short option thing to hide the fact that we may have
 764                                          * started to parse aggregated stuff
 765                                          *
 766                                          * This is leaky, too bad.
 767                                          */
 768                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 769                                         *(char *)ctx->argv[0] = '-';
 770                                         goto unknown;
 771                                 case PARSE_OPT_NON_OPTION:
 772                                 case PARSE_OPT_COMPLETE:
 773                                 case PARSE_OPT_HELP:
 774                                         BUG("parse_short_opt() cannot return these");
 775                                 case PARSE_OPT_DONE:
 776                                         break;
 777                                 }
 778                         }
 779                         continue;
 780                 }
 781
 782                 if (!arg[2] /* "--" */ ||
 783                     !strcmp(arg + 2, "end-of-options")) {
 784                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 785                                 ctx->argc--;
 786                                 ctx->argv++;
 787                         }
 788                         break;
 789                 }
 790
 791                 if (internal_help && !strcmp(arg + 2, "help-all"))
 792                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 793                 if (internal_help && !strcmp(arg + 2, "help"))
 794                         goto show_usage;
 795                 switch (parse_long_opt(ctx, arg + 2, options)) {
 796                 case PARSE_OPT_ERROR:
 797                         return PARSE_OPT_ERROR;
 798                 case PARSE_OPT_UNKNOWN:
 799                         goto unknown;
 800                 case PARSE_OPT_HELP:
 801                         goto show_usage;
 802                 case PARSE_OPT_NON_OPTION:
 803                 case PARSE_OPT_COMPLETE:
 804                         BUG("parse_long_opt() cannot return these");
 805                 case PARSE_OPT_DONE:
 806                         break;
 807                 }
 808                 continue;
 809 unknown:
 810                 if (ctx->flags & PARSE_OPT_ONE_SHOT)
 811                         break;
 812                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 813                         return PARSE_OPT_UNKNOWN;
 814                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 815                 ctx->opt = NULL;
 816         }
 817         return PARSE_OPT_DONE;
 818
 819  show_usage:
 820         return usage_with_options_internal(ctx, usagestr, options, 0, 0);
 821 }
 822
 823 int parse_options_end(struct parse_opt_ctx_t *ctx)
 824 {
 825         if (ctx->flags & PARSE_OPT_ONE_SHOT)
 826                 return ctx->total - ctx->argc;
 827
 828         MOVE_ARRAY(ctx->out + ctx->cpidx, ctx->argv, ctx->argc);
 829         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 830         return ctx->cpidx + ctx->argc;
 831 }
 832
 833 int parse_options(int argc, const char **argv, const char *prefix,
 834                   const struct option *options, const char * const usagestr[],
 835                   int flags)
 836 {
 837         struct parse_opt_ctx_t ctx;
 838         struct option *real_options;
 839
 840         disallow_abbreviated_options =
 841                 git_env_bool("GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS", 0);
 842
 843         memset(&ctx, 0, sizeof(ctx));
 844         real_options = preprocess_options(&ctx, options);
 845         if (real_options)
 846                 options = real_options;
 847         parse_options_start_1(&ctx, argc, argv, prefix, options, flags);
 848         switch (parse_options_step(&ctx, options, usagestr)) {
 849         case PARSE_OPT_HELP:
 850         case PARSE_OPT_ERROR:
 851                 exit(129);
 852         case PARSE_OPT_COMPLETE:
 853                 exit(0);
 854         case PARSE_OPT_NON_OPTION:
 855         case PARSE_OPT_DONE:
 856                 break;
 857         default: /* PARSE_OPT_UNKNOWN */
 858                 if (ctx.argv[0][1] == '-') {
 859                         error(_("unknown option `%s'"), ctx.argv[0] + 2);
 860                 } else if (isascii(*ctx.opt)) {
 861                         error(_("unknown switch `%c'"), *ctx.opt);
 862                 } else {
 863                         error(_("unknown non-ascii option in string: `%s'"),
 864                               ctx.argv[0]);
 865                 }
 866                 usage_with_options(usagestr, options);
 867         }
 868
 869         precompose_argv(argc, argv);
 870         free(real_options);
 871         free(ctx.alias_groups);
 872         return parse_options_end(&ctx);
 873 }
 874
 875 static int usage_argh(const struct option *opts, FILE *outfile)
 876 {
 877         const char *s;
 878         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 879                 !opts->argh || !!strpbrk(opts->argh, "()<>[]|");
 880         if (opts->flags & PARSE_OPT_OPTARG)
 881                 if (opts->long_name)
 882                         s = literal ? "[=%s]" : "[=<%s>]";
 883                 else
 884                         s = literal ? "[%s]" : "[<%s>]";
 885         else
 886                 s = literal ? " %s" : " <%s>";
 887         return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
 888 }
 889
 890 #define USAGE_OPTS_WIDTH 24
 891 #define USAGE_GAP         2
 892
 893 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 894                                        const char * const *usagestr,
 895                                        const struct option *opts, int full, int err)
 896 {
 897         FILE *outfile = err ? stderr : stdout;
 898         int need_newline;
 899
 900         if (!usagestr)
 901                 return PARSE_OPT_HELP;
 902
 903         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 904                 fprintf(outfile, "cat <<\\EOF\n");
 905
 906         fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
 907         while (*usagestr && **usagestr)
 908                 /*
 909                  * TRANSLATORS: the colon here should align with the
 910                  * one in "usage: %s" translation.
 911                  */
 912                 fprintf_ln(outfile, _("   or: %s"), _(*usagestr++));
 913         while (*usagestr) {
 914                 if (**usagestr)
 915                         fprintf_ln(outfile, _("    %s"), _(*usagestr));
 916                 else
 917                         fputc('\n', outfile);
 918                 usagestr++;
 919         }
 920
 921         need_newline = 1;
 922
 923         for (; opts->type != OPTION_END; opts++) {
 924                 size_t pos;
 925                 int pad;
 926
 927                 if (opts->type == OPTION_GROUP) {
 928                         fputc('\n', outfile);
 929                         need_newline = 0;
 930                         if (*opts->help)
 931                                 fprintf(outfile, "%s\n", _(opts->help));
 932                         continue;
 933                 }
 934                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 935                         continue;
 936
 937                 if (need_newline) {
 938                         fputc('\n', outfile);
 939                         need_newline = 0;
 940                 }
 941
 942                 pos = fprintf(outfile, "    ");
 943                 if (opts->short_name) {
 944                         if (opts->flags & PARSE_OPT_NODASH)
 945                                 pos += fprintf(outfile, "%c", opts->short_name);
 946                         else
 947                                 pos += fprintf(outfile, "-%c", opts->short_name);
 948                 }
 949                 if (opts->long_name && opts->short_name)
 950                         pos += fprintf(outfile, ", ");
 951                 if (opts->long_name)
 952                         pos += fprintf(outfile, "--%s", opts->long_name);
 953                 if (opts->type == OPTION_NUMBER)
 954                         pos += utf8_fprintf(outfile, _("-NUM"));
 955
 956                 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 957                     !(opts->flags & PARSE_OPT_NOARG))
 958                         pos += usage_argh(opts, outfile);
 959
 960                 if (pos <= USAGE_OPTS_WIDTH)
 961                         pad = USAGE_OPTS_WIDTH - pos;
 962                 else {
 963                         fputc('\n', outfile);
 964                         pad = USAGE_OPTS_WIDTH;
 965                 }
 966                 if (opts->type == OPTION_ALIAS) {
 967                         fprintf(outfile, "%*s", pad + USAGE_GAP, "");
 968                         fprintf_ln(outfile, _("alias of --%s"),
 969                                    (const char *)opts->value);
 970                         continue;
 971                 }
 972                 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
 973         }
 974         fputc('\n', outfile);
 975
 976         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 977                 fputs("EOF\n", outfile);
 978
 979         return PARSE_OPT_HELP;
 980 }
 981
 982 void NORETURN usage_with_options(const char * const *usagestr,
 983                         const struct option *opts)
 984 {
 985         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 986         exit(129);
 987 }
 988
 989 void NORETURN usage_msg_opt(const char *msg,
 990                    const char * const *usagestr,
 991                    const struct option *options)
 992 {
 993         fprintf(stderr, "fatal: %s\n\n", msg);
 994         usage_with_options(usagestr, options);
 995 }
 996
 997 const char *optname(const struct option *opt, int flags)
 998 {
 999         static struct strbuf sb = STRBUF_INIT;
1000
1001         strbuf_reset(&sb);
1002         if (flags & OPT_SHORT)
1003                 strbuf_addf(&sb, "switch `%c'", opt->short_name);
1004         else if (flags & OPT_UNSET)
1005                 strbuf_addf(&sb, "option `no-%s'", opt->long_name);
1006         else
1007                 strbuf_addf(&sb, "option `%s'", opt->long_name);
1008
1009         return sb.buf;
1010 }