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->flags & PARSE_OPT_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         /*
  99          * Giving the same mode option twice, although unnecessary,
 100          * is not a grave error, so let it pass.
 101          */
 102         if ((opt->flags & PARSE_OPT_CMDMODE) &&
 103             *(int *)opt->value && *(int *)opt->value != opt->defval)
 104                 return opt_command_mode_error(opt, all_opts, flags);
 105
 106         switch (opt->type) {
 107         case OPTION_LOWLEVEL_CALLBACK:
 108                 return opt->ll_callback(p, opt, NULL, unset);
 109
 110         case OPTION_BIT:
 111                 if (unset)
 112                         *(int *)opt->value &= ~opt->defval;
 113                 else
 114                         *(int *)opt->value |= opt->defval;
 115                 return 0;
 116
 117         case OPTION_NEGBIT:
 118                 if (unset)
 119                         *(int *)opt->value |= opt->defval;
 120                 else
 121                         *(int *)opt->value &= ~opt->defval;
 122                 return 0;
 123
 124         case OPTION_BITOP:
 125                 if (unset)
 126                         BUG("BITOP can't have unset form");
 127                 *(int *)opt->value &= ~opt->extra;
 128                 *(int *)opt->value |= opt->defval;
 129                 return 0;
 130
 131         case OPTION_COUNTUP:
 132                 if (*(int *)opt->value < 0)
 133                         *(int *)opt->value = 0;
 134                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
 135                 return 0;
 136
 137         case OPTION_SET_INT:
 138                 *(int *)opt->value = unset ? 0 : opt->defval;
 139                 return 0;
 140
 141         case OPTION_STRING:
 142                 if (unset)
 143                         *(const char **)opt->value = NULL;
 144                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 145                         *(const char **)opt->value = (const char *)opt->defval;
 146                 else
 147                         return get_arg(p, opt, flags, (const char **)opt->value);
 148                 return 0;
 149
 150         case OPTION_FILENAME:
 151                 err = 0;
 152                 if (unset)
 153                         *(const char **)opt->value = NULL;
 154                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 155                         *(const char **)opt->value = (const char *)opt->defval;
 156                 else
 157                         err = get_arg(p, opt, flags, (const char **)opt->value);
 158
 159                 if (!err)
 160                         fix_filename(p->prefix, (const char **)opt->value);
 161                 return err;
 162
 163         case OPTION_CALLBACK:
 164         {
 165                 const char *p_arg = NULL;
 166                 int p_unset;
 167
 168                 if (unset)
 169                         p_unset = 1;
 170                 else if (opt->flags & PARSE_OPT_NOARG)
 171                         p_unset = 0;
 172                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 173                         p_unset = 0;
 174                 else if (get_arg(p, opt, flags, &arg))
 175                         return -1;
 176                 else {
 177                         p_unset = 0;
 178                         p_arg = arg;
 179                 }
 180                 if (opt->callback)
 181                         return (*opt->callback)(opt, p_arg, p_unset) ? (-1) : 0;
 182                 else
 183                         return (*opt->ll_callback)(p, opt, p_arg, p_unset);
 184         }
 185         case OPTION_INTEGER:
 186                 if (unset) {
 187                         *(int *)opt->value = 0;
 188                         return 0;
 189                 }
 190                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 191                         *(int *)opt->value = opt->defval;
 192                         return 0;
 193                 }
 194                 if (get_arg(p, opt, flags, &arg))
 195                         return -1;
 196                 if (!*arg)
 197                         return error(_("%s expects a numerical value"),
 198                                      optname(opt, flags));
 199                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 200                 if (*s)
 201                         return error(_("%s expects a numerical value"),
 202                                      optname(opt, flags));
 203                 return 0;
 204
 205         case OPTION_MAGNITUDE:
 206                 if (unset) {
 207                         *(unsigned long *)opt->value = 0;
 208                         return 0;
 209                 }
 210                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 211                         *(unsigned long *)opt->value = opt->defval;
 212                         return 0;
 213                 }
 214                 if (get_arg(p, opt, flags, &arg))
 215                         return -1;
 216                 if (!git_parse_ulong(arg, opt->value))
 217                         return error(_("%s expects a non-negative integer value"
 218                                        " with an optional k/m/g suffix"),
 219                                      optname(opt, flags));
 220                 return 0;
 221
 222         default:
 223                 BUG("opt->type %d should not happen", opt->type);
 224         }
 225 }
 226
 227 static enum parse_opt_result parse_short_opt(struct parse_opt_ctx_t *p,
 228                                              const struct option *options)
 229 {
 230         const struct option *all_opts = options;
 231         const struct option *numopt = NULL;
 232
 233         for (; options->type != OPTION_END; options++) {
 234                 if (options->short_name == *p->opt) {
 235                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 236                         return get_value(p, options, all_opts, OPT_SHORT);
 237                 }
 238
 239                 /*
 240                  * Handle the numerical option later, explicit one-digit
 241                  * options take precedence over it.
 242                  */
 243                 if (options->type == OPTION_NUMBER)
 244                         numopt = options;
 245         }
 246         if (numopt && isdigit(*p->opt)) {
 247                 size_t len = 1;
 248                 char *arg;
 249                 int rc;
 250
 251                 while (isdigit(p->opt[len]))
 252                         len++;
 253                 arg = xmemdupz(p->opt, len);
 254                 p->opt = p->opt[len] ? p->opt + len : NULL;
 255                 if (numopt->callback)
 256                         rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 257                 else
 258                         rc = (*numopt->ll_callback)(p, numopt, arg, 0);
 259                 free(arg);
 260                 return rc;
 261         }
 262         return PARSE_OPT_UNKNOWN;
 263 }
 264
 265 static int has_string(const char *it, const char **array)
 266 {
 267         while (*array)
 268                 if (!strcmp(it, *(array++)))
 269                         return 1;
 270         return 0;
 271 }
 272
 273 static int is_alias(struct parse_opt_ctx_t *ctx,
 274                     const struct option *one_opt,
 275                     const struct option *another_opt)
 276 {
 277         const char **group;
 278
 279         if (!ctx->alias_groups)
 280                 return 0;
 281
 282         if (!one_opt->long_name || !another_opt->long_name)
 283                 return 0;
 284
 285         for (group = ctx->alias_groups; *group; group += 3) {
 286                 /* it and other are from the same family? */
 287                 if (has_string(one_opt->long_name, group) &&
 288                     has_string(another_opt->long_name, group))
 289                         return 1;
 290         }
 291         return 0;
 292 }
 293
 294 static enum parse_opt_result parse_long_opt(
 295         struct parse_opt_ctx_t *p, const char *arg,
 296         const struct option *options)
 297 {
 298         const struct option *all_opts = options;
 299         const char *arg_end = strchrnul(arg, '=');
 300         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 301         int abbrev_flags = 0, ambiguous_flags = 0;
 302
 303         for (; options->type != OPTION_END; options++) {
 304                 const char *rest, *long_name = options->long_name;
 305                 int flags = 0, opt_flags = 0;
 306
 307                 if (!long_name)
 308                         continue;
 309
 310 again:
 311                 if (!skip_prefix(arg, long_name, &rest))
 312                         rest = NULL;
 313                 if (options->type == OPTION_ARGUMENT) {
 314                         if (!rest)
 315                                 continue;
 316                         if (*rest == '=')
 317                                 return error(_("%s takes no value"),
 318                                              optname(options, flags));
 319                         if (*rest)
 320                                 continue;
 321                         if (options->value)
 322                                 *(int *)options->value = options->defval;
 323                         p->out[p->cpidx++] = arg - 2;
 324                         return PARSE_OPT_DONE;
 325                 }
 326                 if (!rest) {
 327                         /* abbreviated? */
 328                         if (!(p->flags & PARSE_OPT_KEEP_UNKNOWN) &&
 329                             !strncmp(long_name, arg, arg_end - arg)) {
 330 is_abbreviated:
 331                                 if (abbrev_option &&
 332                                     !is_alias(p, abbrev_option, options)) {
 333                                         /*
 334                                          * If this is abbreviated, it is
 335                                          * ambiguous. So when there is no
 336                                          * exact match later, we need to
 337                                          * error out.
 338                                          */
 339                                         ambiguous_option = abbrev_option;
 340                                         ambiguous_flags = abbrev_flags;
 341                                 }
 342                                 if (!(flags & OPT_UNSET) && *arg_end)
 343                                         p->opt = arg_end + 1;
 344                                 abbrev_option = options;
 345                                 abbrev_flags = flags ^ opt_flags;
 346                                 continue;
 347                         }
 348                         /* negation allowed? */
 349                         if (options->flags & PARSE_OPT_NONEG)
 350                                 continue;
 351                         /* negated and abbreviated very much? */
 352                         if (starts_with("no-", arg)) {
 353                                 flags |= OPT_UNSET;
 354                                 goto is_abbreviated;
 355                         }
 356                         /* negated? */
 357                         if (!starts_with(arg, "no-")) {
 358                                 if (skip_prefix(long_name, "no-", &long_name)) {
 359                                         opt_flags |= OPT_UNSET;
 360                                         goto again;
 361                                 }
 362                                 continue;
 363                         }
 364                         flags |= OPT_UNSET;
 365                         if (!skip_prefix(arg + 3, long_name, &rest)) {
 366                                 /* abbreviated and negated? */
 367                                 if (starts_with(long_name, arg + 3))
 368                                         goto is_abbreviated;
 369                                 else
 370                                         continue;
 371                         }
 372                 }
 373                 if (*rest) {
 374                         if (*rest != '=')
 375                                 continue;
 376                         p->opt = rest + 1;
 377                 }
 378                 return get_value(p, options, all_opts, flags ^ opt_flags);
 379         }
 380
 381         if (disallow_abbreviated_options && (ambiguous_option || abbrev_option))
 382                 die("disallowed abbreviated or ambiguous option '%.*s'",
 383                     (int)(arg_end - arg), arg);
 384
 385         if (ambiguous_option) {
 386                 error(_("ambiguous option: %s "
 387                         "(could be --%s%s or --%s%s)"),
 388                         arg,
 389                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 390                         ambiguous_option->long_name,
 391                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 392                         abbrev_option->long_name);
 393                 return PARSE_OPT_HELP;
 394         }
 395         if (abbrev_option)
 396                 return get_value(p, abbrev_option, all_opts, abbrev_flags);
 397         return PARSE_OPT_UNKNOWN;
 398 }
 399
 400 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 401                             const struct option *options)
 402 {
 403         const struct option *all_opts = options;
 404
 405         for (; options->type != OPTION_END; options++) {
 406                 if (!(options->flags & PARSE_OPT_NODASH))
 407                         continue;
 408                 if (options->short_name == arg[0] && arg[1] == '\0')
 409                         return get_value(p, options, all_opts, OPT_SHORT);
 410         }
 411         return -2;
 412 }
 413
 414 static void check_typos(const char *arg, const struct option *options)
 415 {
 416         if (strlen(arg) < 3)
 417                 return;
 418
 419         if (starts_with(arg, "no-")) {
 420                 error(_("did you mean `--%s` (with two dashes)?"), arg);
 421                 exit(129);
 422         }
 423
 424         for (; options->type != OPTION_END; options++) {
 425                 if (!options->long_name)
 426                         continue;
 427                 if (starts_with(options->long_name, arg)) {
 428                         error(_("did you mean `--%s` (with two dashes)?"), arg);
 429                         exit(129);
 430                 }
 431         }
 432 }
 433
 434 static void parse_options_check(const struct option *opts)
 435 {
 436         int err = 0;
 437         char short_opts[128];
 438
 439         memset(short_opts, '\0', sizeof(short_opts));
 440         for (; opts->type != OPTION_END; opts++) {
 441                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 442                     (opts->flags & PARSE_OPT_OPTARG))
 443                         err |= optbug(opts, "uses incompatible flags "
 444                                         "LASTARG_DEFAULT and OPTARG");
 445                 if (opts->short_name) {
 446                         if (0x7F <= opts->short_name)
 447                                 err |= optbug(opts, "invalid short name");
 448                         else if (short_opts[opts->short_name]++)
 449                                 err |= optbug(opts, "short name already used");
 450                 }
 451                 if (opts->flags & PARSE_OPT_NODASH &&
 452                     ((opts->flags & PARSE_OPT_OPTARG) ||
 453                      !(opts->flags & PARSE_OPT_NOARG) ||
 454                      !(opts->flags & PARSE_OPT_NONEG) ||
 455                      opts->long_name))
 456                         err |= optbug(opts, "uses feature "
 457                                         "not supported for dashless options");
 458                 switch (opts->type) {
 459                 case OPTION_COUNTUP:
 460                 case OPTION_BIT:
 461                 case OPTION_NEGBIT:
 462                 case OPTION_SET_INT:
 463                 case OPTION_NUMBER:
 464                         if ((opts->flags & PARSE_OPT_OPTARG) ||
 465                             !(opts->flags & PARSE_OPT_NOARG))
 466                                 err |= optbug(opts, "should not accept an argument");
 467                         break;
 468                 case OPTION_CALLBACK:
 469                         if (!opts->callback && !opts->ll_callback)
 470                                 BUG("OPTION_CALLBACK needs one callback");
 471                         if (opts->callback && opts->ll_callback)
 472                                 BUG("OPTION_CALLBACK can't have two callbacks");
 473                         break;
 474                 case OPTION_LOWLEVEL_CALLBACK:
 475                         if (!opts->ll_callback)
 476                                 BUG("OPTION_LOWLEVEL_CALLBACK needs a callback");
 477                         if (opts->callback)
 478                                 BUG("OPTION_LOWLEVEL_CALLBACK needs no high level callback");
 479                         break;
 480                 case OPTION_ALIAS:
 481                         BUG("OPT_ALIAS() should not remain at this point. "
 482                             "Are you using parse_options_step() directly?\n"
 483                             "That case is not supported yet.");
 484                 default:
 485                         ; /* ok. (usually accepts an argument) */
 486                 }
 487                 if (opts->argh &&
 488                     strcspn(opts->argh, " _") != strlen(opts->argh))
 489                         err |= optbug(opts, "multi-word argh should use dash to separate words");
 490         }
 491         if (err)
 492                 exit(128);
 493 }
 494
 495 static void parse_options_start_1(struct parse_opt_ctx_t *ctx,
 496                                   int argc, const char **argv, const char *prefix,
 497                                   const struct option *options, int flags)
 498 {
 499         ctx->argc = argc;
 500         ctx->argv = argv;
 501         if (!(flags & PARSE_OPT_ONE_SHOT)) {
 502                 ctx->argc--;
 503                 ctx->argv++;
 504         }
 505         ctx->total = ctx->argc;
 506         ctx->out   = argv;
 507         ctx->prefix = prefix;
 508         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 509         ctx->flags = flags;
 510         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 511             (flags & PARSE_OPT_STOP_AT_NON_OPTION) &&
 512             !(flags & PARSE_OPT_ONE_SHOT))
 513                 BUG("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 514         if ((flags & PARSE_OPT_ONE_SHOT) &&
 515             (flags & PARSE_OPT_KEEP_ARGV0))
 516                 BUG("Can't keep argv0 if you don't have it");
 517         parse_options_check(options);
 518 }
 519
 520 void parse_options_start(struct parse_opt_ctx_t *ctx,
 521                          int argc, const char **argv, const char *prefix,
 522                          const struct option *options, int flags)
 523 {
 524         memset(ctx, 0, sizeof(*ctx));
 525         parse_options_start_1(ctx, argc, argv, prefix, options, flags);
 526 }
 527
 528 static void show_negated_gitcomp(const struct option *opts, int show_all,
 529                                  int nr_noopts)
 530 {
 531         int printed_dashdash = 0;
 532
 533         for (; opts->type != OPTION_END; opts++) {
 534                 int has_unset_form = 0;
 535                 const char *name;
 536
 537                 if (!opts->long_name)
 538                         continue;
 539                 if (!show_all &&
 540                         (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, int show_all)
 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 (!show_all &&
 588                         (opts->flags & (PARSE_OPT_HIDDEN | PARSE_OPT_NOCOMPLETE | PARSE_OPT_FROM_ALIAS)))
 589                         continue;
 590
 591                 switch (opts->type) {
 592                 case OPTION_GROUP:
 593                         continue;
 594                 case OPTION_STRING:
 595                 case OPTION_FILENAME:
 596                 case OPTION_INTEGER:
 597                 case OPTION_MAGNITUDE:
 598                 case OPTION_CALLBACK:
 599                         if (opts->flags & PARSE_OPT_NOARG)
 600                                 break;
 601                         if (opts->flags & PARSE_OPT_OPTARG)
 602                                 break;
 603                         if (opts->flags & PARSE_OPT_LASTARG_DEFAULT)
 604                                 break;
 605                         suffix = "=";
 606                         break;
 607                 default:
 608                         break;
 609                 }
 610                 if (opts->flags & PARSE_OPT_COMP_ARG)
 611                         suffix = "=";
 612                 if (starts_with(opts->long_name, "no-"))
 613                         nr_noopts++;
 614                 printf(" --%s%s", opts->long_name, suffix);
 615         }
 616         show_negated_gitcomp(original_opts, show_all, -1);
 617         show_negated_gitcomp(original_opts, show_all, nr_noopts);
 618         fputc('\n', stdout);
 619         return PARSE_OPT_COMPLETE;
 620 }
 621
 622 /*
 623  * Scan and may produce a new option[] array, which should be used
 624  * instead of the original 'options'.
 625  *
 626  * Right now this is only used to preprocess and substitute
 627  * OPTION_ALIAS.
 628  *
 629  * The returned options should be freed using free_preprocessed_options.
 630  */
 631 static struct option *preprocess_options(struct parse_opt_ctx_t *ctx,
 632                                          const struct option *options)
 633 {
 634         struct option *newopt;
 635         int i, nr, alias;
 636         int nr_aliases = 0;
 637
 638         for (nr = 0; options[nr].type != OPTION_END; nr++) {
 639                 if (options[nr].type == OPTION_ALIAS)
 640                         nr_aliases++;
 641         }
 642
 643         if (!nr_aliases)
 644                 return NULL;
 645
 646         ALLOC_ARRAY(newopt, nr + 1);
 647         COPY_ARRAY(newopt, options, nr + 1);
 648
 649         /* each alias has two string pointers and NULL */
 650         CALLOC_ARRAY(ctx->alias_groups, 3 * (nr_aliases + 1));
 651
 652         for (alias = 0, i = 0; i < nr; i++) {
 653                 int short_name;
 654                 const char *long_name;
 655                 const char *source;
 656                 struct strbuf help = STRBUF_INIT;
 657                 int j;
 658
 659                 if (newopt[i].type != OPTION_ALIAS)
 660                         continue;
 661
 662                 short_name = newopt[i].short_name;
 663                 long_name = newopt[i].long_name;
 664                 source = newopt[i].value;
 665
 666                 if (!long_name)
 667                         BUG("An alias must have long option name");
 668                 strbuf_addf(&help, _("alias of --%s"), source);
 669
 670                 for (j = 0; j < nr; j++) {
 671                         const char *name = options[j].long_name;
 672
 673                         if (!name || strcmp(name, source))
 674                                 continue;
 675
 676                         if (options[j].type == OPTION_ALIAS)
 677                                 BUG("No please. Nested aliases are not supported.");
 678
 679                         memcpy(newopt + i, options + j, sizeof(*newopt));
 680                         newopt[i].short_name = short_name;
 681                         newopt[i].long_name = long_name;
 682                         newopt[i].help = strbuf_detach(&help, NULL);
 683                         newopt[i].flags |= PARSE_OPT_FROM_ALIAS;
 684                         break;
 685                 }
 686
 687                 if (j == nr)
 688                         BUG("could not find source option '%s' of alias '%s'",
 689                             source, newopt[i].long_name);
 690                 ctx->alias_groups[alias * 3 + 0] = newopt[i].long_name;
 691                 ctx->alias_groups[alias * 3 + 1] = options[j].long_name;
 692                 ctx->alias_groups[alias * 3 + 2] = NULL;
 693                 alias++;
 694         }
 695
 696         return newopt;
 697 }
 698
 699 static void free_preprocessed_options(struct option *options)
 700 {
 701         int i;
 702
 703         if (!options)
 704                 return;
 705
 706         for (i = 0; options[i].type != OPTION_END; i++) {
 707                 if (options[i].flags & PARSE_OPT_FROM_ALIAS)
 708                         free((void *)options[i].help);
 709         }
 710         free(options);
 711 }
 712
 713 static int usage_with_options_internal(struct parse_opt_ctx_t *,
 714                                        const char * const *,
 715                                        const struct option *, int, int);
 716
 717 int parse_options_step(struct parse_opt_ctx_t *ctx,
 718                        const struct option *options,
 719                        const char * const usagestr[])
 720 {
 721         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 722
 723         /* we must reset ->opt, unknown short option leave it dangling */
 724         ctx->opt = NULL;
 725
 726         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 727                 const char *arg = ctx->argv[0];
 728
 729                 if (ctx->flags & PARSE_OPT_ONE_SHOT &&
 730                     ctx->argc != ctx->total)
 731                         break;
 732
 733                 if (*arg != '-' || !arg[1]) {
 734                         if (parse_nodash_opt(ctx, arg, options) == 0)
 735                                 continue;
 736                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 737                                 return PARSE_OPT_NON_OPTION;
 738                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 739                         continue;
 740                 }
 741
 742                 /* lone -h asks for help */
 743                 if (internal_help && ctx->total == 1 && !strcmp(arg + 1, "h"))
 744                         goto show_usage;
 745
 746                 /*
 747                  * lone --git-completion-helper and --git-completion-helper-all
 748                  * are asked by git-completion.bash
 749                  */
 750                 if (ctx->total == 1 && !strcmp(arg, "--git-completion-helper"))
 751                         return show_gitcomp(options, 0);
 752                 if (ctx->total == 1 && !strcmp(arg, "--git-completion-helper-all"))
 753                         return show_gitcomp(options, 1);
 754
 755                 if (arg[1] != '-') {
 756                         ctx->opt = arg + 1;
 757                         switch (parse_short_opt(ctx, options)) {
 758                         case PARSE_OPT_ERROR:
 759                                 return PARSE_OPT_ERROR;
 760                         case PARSE_OPT_UNKNOWN:
 761                                 if (ctx->opt)
 762                                         check_typos(arg + 1, options);
 763                                 if (internal_help && *ctx->opt == 'h')
 764                                         goto show_usage;
 765                                 goto unknown;
 766                         case PARSE_OPT_NON_OPTION:
 767                         case PARSE_OPT_HELP:
 768                         case PARSE_OPT_COMPLETE:
 769                                 BUG("parse_short_opt() cannot return these");
 770                         case PARSE_OPT_DONE:
 771                                 break;
 772                         }
 773                         if (ctx->opt)
 774                                 check_typos(arg + 1, options);
 775                         while (ctx->opt) {
 776                                 switch (parse_short_opt(ctx, options)) {
 777                                 case PARSE_OPT_ERROR:
 778                                         return PARSE_OPT_ERROR;
 779                                 case PARSE_OPT_UNKNOWN:
 780                                         if (internal_help && *ctx->opt == 'h')
 781                                                 goto show_usage;
 782
 783                                         /* fake a short option thing to hide the fact that we may have
 784                                          * started to parse aggregated stuff
 785                                          *
 786                                          * This is leaky, too bad.
 787                                          */
 788                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 789                                         *(char *)ctx->argv[0] = '-';
 790                                         goto unknown;
 791                                 case PARSE_OPT_NON_OPTION:
 792                                 case PARSE_OPT_COMPLETE:
 793                                 case PARSE_OPT_HELP:
 794                                         BUG("parse_short_opt() cannot return these");
 795                                 case PARSE_OPT_DONE:
 796                                         break;
 797                                 }
 798                         }
 799                         continue;
 800                 }
 801
 802                 if (!arg[2] /* "--" */ ||
 803                     !strcmp(arg + 2, "end-of-options")) {
 804                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 805                                 ctx->argc--;
 806                                 ctx->argv++;
 807                         }
 808                         break;
 809                 }
 810
 811                 if (internal_help && !strcmp(arg + 2, "help-all"))
 812                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 813                 if (internal_help && !strcmp(arg + 2, "help"))
 814                         goto show_usage;
 815                 switch (parse_long_opt(ctx, arg + 2, options)) {
 816                 case PARSE_OPT_ERROR:
 817                         return PARSE_OPT_ERROR;
 818                 case PARSE_OPT_UNKNOWN:
 819                         goto unknown;
 820                 case PARSE_OPT_HELP:
 821                         goto show_usage;
 822                 case PARSE_OPT_NON_OPTION:
 823                 case PARSE_OPT_COMPLETE:
 824                         BUG("parse_long_opt() cannot return these");
 825                 case PARSE_OPT_DONE:
 826                         break;
 827                 }
 828                 continue;
 829 unknown:
 830                 if (ctx->flags & PARSE_OPT_ONE_SHOT)
 831                         break;
 832                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 833                         return PARSE_OPT_UNKNOWN;
 834                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 835                 ctx->opt = NULL;
 836         }
 837         return PARSE_OPT_DONE;
 838
 839  show_usage:
 840         return usage_with_options_internal(ctx, usagestr, options, 0, 0);
 841 }
 842
 843 int parse_options_end(struct parse_opt_ctx_t *ctx)
 844 {
 845         if (ctx->flags & PARSE_OPT_ONE_SHOT)
 846                 return ctx->total - ctx->argc;
 847
 848         MOVE_ARRAY(ctx->out + ctx->cpidx, ctx->argv, ctx->argc);
 849         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 850         return ctx->cpidx + ctx->argc;
 851 }
 852
 853 int parse_options(int argc, const char **argv, const char *prefix,
 854                   const struct option *options, const char * const usagestr[],
 855                   int flags)
 856 {
 857         struct parse_opt_ctx_t ctx;
 858         struct option *real_options;
 859
 860         disallow_abbreviated_options =
 861                 git_env_bool("GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS", 0);
 862
 863         memset(&ctx, 0, sizeof(ctx));
 864         real_options = preprocess_options(&ctx, options);
 865         if (real_options)
 866                 options = real_options;
 867         parse_options_start_1(&ctx, argc, argv, prefix, options, flags);
 868         switch (parse_options_step(&ctx, options, usagestr)) {
 869         case PARSE_OPT_HELP:
 870         case PARSE_OPT_ERROR:
 871                 exit(129);
 872         case PARSE_OPT_COMPLETE:
 873                 exit(0);
 874         case PARSE_OPT_NON_OPTION:
 875         case PARSE_OPT_DONE:
 876                 break;
 877         default: /* PARSE_OPT_UNKNOWN */
 878                 if (ctx.argv[0][1] == '-') {
 879                         error(_("unknown option `%s'"), ctx.argv[0] + 2);
 880                 } else if (isascii(*ctx.opt)) {
 881                         error(_("unknown switch `%c'"), *ctx.opt);
 882                 } else {
 883                         error(_("unknown non-ascii option in string: `%s'"),
 884                               ctx.argv[0]);
 885                 }
 886                 usage_with_options(usagestr, options);
 887         }
 888
 889         precompose_argv_prefix(argc, argv, NULL);
 890         free_preprocessed_options(real_options);
 891         free(ctx.alias_groups);
 892         return parse_options_end(&ctx);
 893 }
 894
 895 static int usage_argh(const struct option *opts, FILE *outfile)
 896 {
 897         const char *s;
 898         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 899                 !opts->argh || !!strpbrk(opts->argh, "()<>[]|");
 900         if (opts->flags & PARSE_OPT_OPTARG)
 901                 if (opts->long_name)
 902                         s = literal ? "[=%s]" : "[=<%s>]";
 903                 else
 904                         s = literal ? "[%s]" : "[<%s>]";
 905         else
 906                 s = literal ? " %s" : " <%s>";
 907         return utf8_fprintf(outfile, s, opts->argh ? _(opts->argh) : _("..."));
 908 }
 909
 910 #define USAGE_OPTS_WIDTH 24
 911 #define USAGE_GAP         2
 912
 913 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 914                                        const char * const *usagestr,
 915                                        const struct option *opts, int full, int err)
 916 {
 917         FILE *outfile = err ? stderr : stdout;
 918         int need_newline;
 919
 920         if (!usagestr)
 921                 return PARSE_OPT_HELP;
 922
 923         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 924                 fprintf(outfile, "cat <<\\EOF\n");
 925
 926         fprintf_ln(outfile, _("usage: %s"), _(*usagestr++));
 927         while (*usagestr && **usagestr)
 928                 /*
 929                  * TRANSLATORS: the colon here should align with the
 930                  * one in "usage: %s" translation.
 931                  */
 932                 fprintf_ln(outfile, _("   or: %s"), _(*usagestr++));
 933         while (*usagestr) {
 934                 if (**usagestr)
 935                         fprintf_ln(outfile, _("    %s"), _(*usagestr));
 936                 else
 937                         fputc('\n', outfile);
 938                 usagestr++;
 939         }
 940
 941         need_newline = 1;
 942
 943         for (; opts->type != OPTION_END; opts++) {
 944                 size_t pos;
 945                 int pad;
 946
 947                 if (opts->type == OPTION_GROUP) {
 948                         fputc('\n', outfile);
 949                         need_newline = 0;
 950                         if (*opts->help)
 951                                 fprintf(outfile, "%s\n", _(opts->help));
 952                         continue;
 953                 }
 954                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 955                         continue;
 956
 957                 if (need_newline) {
 958                         fputc('\n', outfile);
 959                         need_newline = 0;
 960                 }
 961
 962                 pos = fprintf(outfile, "    ");
 963                 if (opts->short_name) {
 964                         if (opts->flags & PARSE_OPT_NODASH)
 965                                 pos += fprintf(outfile, "%c", opts->short_name);
 966                         else
 967                                 pos += fprintf(outfile, "-%c", opts->short_name);
 968                 }
 969                 if (opts->long_name && opts->short_name)
 970                         pos += fprintf(outfile, ", ");
 971                 if (opts->long_name)
 972                         pos += fprintf(outfile, "--%s", opts->long_name);
 973                 if (opts->type == OPTION_NUMBER)
 974                         pos += utf8_fprintf(outfile, _("-NUM"));
 975
 976                 if ((opts->flags & PARSE_OPT_LITERAL_ARGHELP) ||
 977                     !(opts->flags & PARSE_OPT_NOARG))
 978                         pos += usage_argh(opts, outfile);
 979
 980                 if (pos <= USAGE_OPTS_WIDTH)
 981                         pad = USAGE_OPTS_WIDTH - pos;
 982                 else {
 983                         fputc('\n', outfile);
 984                         pad = USAGE_OPTS_WIDTH;
 985                 }
 986                 if (opts->type == OPTION_ALIAS) {
 987                         fprintf(outfile, "%*s", pad + USAGE_GAP, "");
 988                         fprintf_ln(outfile, _("alias of --%s"),
 989                                    (const char *)opts->value);
 990                         continue;
 991                 }
 992                 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", _(opts->help));
 993         }
 994         fputc('\n', outfile);
 995
 996         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 997                 fputs("EOF\n", outfile);
 998
 999         return PARSE_OPT_HELP;
1000 }
1001
1002 void NORETURN usage_with_options(const char * const *usagestr,
1003                         const struct option *opts)
1004 {
1005         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
1006         exit(129);
1007 }
1008
1009 void NORETURN usage_msg_opt(const char *msg,
1010                    const char * const *usagestr,
1011                    const struct option *options)
1012 {
1013         fprintf(stderr, "fatal: %s\n\n", msg);
1014         usage_with_options(usagestr, options);
1015 }
1016
1017 const char *optname(const struct option *opt, int flags)
1018 {
1019         static struct strbuf sb = STRBUF_INIT;
1020
1021         strbuf_reset(&sb);
1022         if (flags & OPT_SHORT)
1023                 strbuf_addf(&sb, "switch `%c'", opt->short_name);
1024         else if (flags & OPT_UNSET)
1025                 strbuf_addf(&sb, "option `no-%s'", opt->long_name);
1026         else
1027                 strbuf_addf(&sb, "option `%s'", opt->long_name);
1028
1029         return sb.buf;
1030 }