parse-options.c

   1 #include "git-compat-util.h"
   2 #include "parse-options.h"
   3 #include "cache.h"
   4 #include "commit.h"
   5 #include "color.h"
   6
   7 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
   8                                const char * const *usagestr,
   9                                const struct option *opts, int err);
  10
  11 #define OPT_SHORT 1
  12 #define OPT_UNSET 2
  13
  14 static int opterror(const struct option *opt, const char *reason, int flags)
  15 {
  16         if (flags & OPT_SHORT)
  17                 return error("switch `%c' %s", opt->short_name, reason);
  18         if (flags & OPT_UNSET)
  19                 return error("option `no-%s' %s", opt->long_name, reason);
  20         return error("option `%s' %s", opt->long_name, reason);
  21 }
  22
  23 static int get_arg(struct parse_opt_ctx_t *p, const struct option *opt,
  24                    int flags, const char **arg)
  25 {
  26         if (p->opt) {
  27                 *arg = p->opt;
  28                 p->opt = NULL;
  29         } else if (p->argc == 1 && (opt->flags & PARSE_OPT_LASTARG_DEFAULT)) {
  30                 *arg = (const char *)opt->defval;
  31         } else if (p->argc > 1) {
  32                 p->argc--;
  33                 *arg = *++p->argv;
  34         } else
  35                 return opterror(opt, "requires a value", flags);
  36         return 0;
  37 }
  38
  39 static void fix_filename(const char *prefix, const char **file)
  40 {
  41         if (!file || !*file || !prefix || is_absolute_path(*file)
  42             || !strcmp("-", *file))
  43                 return;
  44         *file = xstrdup(prefix_filename(prefix, strlen(prefix), *file));
  45 }
  46
  47 static int get_value(struct parse_opt_ctx_t *p,
  48                      const struct option *opt, int flags)
  49 {
  50         const char *s, *arg;
  51         const int unset = flags & OPT_UNSET;
  52         int err;
  53
  54         if (unset && p->opt)
  55                 return opterror(opt, "takes no value", flags);
  56         if (unset && (opt->flags & PARSE_OPT_NONEG))
  57                 return opterror(opt, "isn't available", flags);
  58
  59         if (!(flags & OPT_SHORT) && p->opt) {
  60                 switch (opt->type) {
  61                 case OPTION_CALLBACK:
  62                         if (!(opt->flags & PARSE_OPT_NOARG))
  63                                 break;
  64                         /* FALLTHROUGH */
  65                 case OPTION_BOOLEAN:
  66                 case OPTION_BIT:
  67                 case OPTION_NEGBIT:
  68                 case OPTION_SET_INT:
  69                 case OPTION_SET_PTR:
  70                         return opterror(opt, "takes no value", flags);
  71                 default:
  72                         break;
  73                 }
  74         }
  75
  76         switch (opt->type) {
  77         case OPTION_BIT:
  78                 if (unset)
  79                         *(int *)opt->value &= ~opt->defval;
  80                 else
  81                         *(int *)opt->value |= opt->defval;
  82                 return 0;
  83
  84         case OPTION_NEGBIT:
  85                 if (unset)
  86                         *(int *)opt->value |= opt->defval;
  87                 else
  88                         *(int *)opt->value &= ~opt->defval;
  89                 return 0;
  90
  91         case OPTION_BOOLEAN:
  92                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  93                 return 0;
  94
  95         case OPTION_SET_INT:
  96                 *(int *)opt->value = unset ? 0 : opt->defval;
  97                 return 0;
  98
  99         case OPTION_SET_PTR:
 100                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
 101                 return 0;
 102
 103         case OPTION_STRING:
 104                 if (unset)
 105                         *(const char **)opt->value = NULL;
 106                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 107                         *(const char **)opt->value = (const char *)opt->defval;
 108                 else
 109                         return get_arg(p, opt, flags, (const char **)opt->value);
 110                 return 0;
 111
 112         case OPTION_FILENAME:
 113                 err = 0;
 114                 if (unset)
 115                         *(const char **)opt->value = NULL;
 116                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 117                         *(const char **)opt->value = (const char *)opt->defval;
 118                 else
 119                         err = get_arg(p, opt, flags, (const char **)opt->value);
 120
 121                 if (!err)
 122                         fix_filename(p->prefix, (const char **)opt->value);
 123                 return err;
 124
 125         case OPTION_CALLBACK:
 126                 if (unset)
 127                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 128                 if (opt->flags & PARSE_OPT_NOARG)
 129                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 130                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 131                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 132                 if (get_arg(p, opt, flags, &arg))
 133                         return -1;
 134                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 135
 136         case OPTION_INTEGER:
 137                 if (unset) {
 138                         *(int *)opt->value = 0;
 139                         return 0;
 140                 }
 141                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 142                         *(int *)opt->value = opt->defval;
 143                         return 0;
 144                 }
 145                 if (get_arg(p, opt, flags, &arg))
 146                         return -1;
 147                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 148                 if (*s)
 149                         return opterror(opt, "expects a numerical value", flags);
 150                 return 0;
 151
 152         default:
 153                 die("should not happen, someone must be hit on the forehead");
 154         }
 155 }
 156
 157 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 158 {
 159         const struct option *numopt = NULL;
 160
 161         for (; options->type != OPTION_END; options++) {
 162                 if (options->short_name == *p->opt) {
 163                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 164                         return get_value(p, options, OPT_SHORT);
 165                 }
 166
 167                 /*
 168                  * Handle the numerical option later, explicit one-digit
 169                  * options take precedence over it.
 170                  */
 171                 if (options->type == OPTION_NUMBER)
 172                         numopt = options;
 173         }
 174         if (numopt && isdigit(*p->opt)) {
 175                 size_t len = 1;
 176                 char *arg;
 177                 int rc;
 178
 179                 while (isdigit(p->opt[len]))
 180                         len++;
 181                 arg = xmemdupz(p->opt, len);
 182                 p->opt = p->opt[len] ? p->opt + len : NULL;
 183                 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 184                 free(arg);
 185                 return rc;
 186         }
 187         return -2;
 188 }
 189
 190 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 191                           const struct option *options)
 192 {
 193         const char *arg_end = strchr(arg, '=');
 194         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 195         int abbrev_flags = 0, ambiguous_flags = 0;
 196
 197         if (!arg_end)
 198                 arg_end = arg + strlen(arg);
 199
 200         for (; options->type != OPTION_END; options++) {
 201                 const char *rest;
 202                 int flags = 0;
 203
 204                 if (!options->long_name)
 205                         continue;
 206
 207                 rest = skip_prefix(arg, options->long_name);
 208                 if (options->type == OPTION_ARGUMENT) {
 209                         if (!rest)
 210                                 continue;
 211                         if (*rest == '=')
 212                                 return opterror(options, "takes no value", flags);
 213                         if (*rest)
 214                                 continue;
 215                         p->out[p->cpidx++] = arg - 2;
 216                         return 0;
 217                 }
 218                 if (!rest) {
 219                         /* abbreviated? */
 220                         if (!strncmp(options->long_name, arg, arg_end - arg)) {
 221 is_abbreviated:
 222                                 if (abbrev_option) {
 223                                         /*
 224                                          * If this is abbreviated, it is
 225                                          * ambiguous. So when there is no
 226                                          * exact match later, we need to
 227                                          * error out.
 228                                          */
 229                                         ambiguous_option = abbrev_option;
 230                                         ambiguous_flags = abbrev_flags;
 231                                 }
 232                                 if (!(flags & OPT_UNSET) && *arg_end)
 233                                         p->opt = arg_end + 1;
 234                                 abbrev_option = options;
 235                                 abbrev_flags = flags;
 236                                 continue;
 237                         }
 238                         /* negation allowed? */
 239                         if (options->flags & PARSE_OPT_NONEG)
 240                                 continue;
 241                         /* negated and abbreviated very much? */
 242                         if (!prefixcmp("no-", arg)) {
 243                                 flags |= OPT_UNSET;
 244                                 goto is_abbreviated;
 245                         }
 246                         /* negated? */
 247                         if (strncmp(arg, "no-", 3))
 248                                 continue;
 249                         flags |= OPT_UNSET;
 250                         rest = skip_prefix(arg + 3, options->long_name);
 251                         /* abbreviated and negated? */
 252                         if (!rest && !prefixcmp(options->long_name, arg + 3))
 253                                 goto is_abbreviated;
 254                         if (!rest)
 255                                 continue;
 256                 }
 257                 if (*rest) {
 258                         if (*rest != '=')
 259                                 continue;
 260                         p->opt = rest + 1;
 261                 }
 262                 return get_value(p, options, flags);
 263         }
 264
 265         if (ambiguous_option)
 266                 return error("Ambiguous option: %s "
 267                         "(could be --%s%s or --%s%s)",
 268                         arg,
 269                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 270                         ambiguous_option->long_name,
 271                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 272                         abbrev_option->long_name);
 273         if (abbrev_option)
 274                 return get_value(p, abbrev_option, abbrev_flags);
 275         return -2;
 276 }
 277
 278 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 279                             const struct option *options)
 280 {
 281         for (; options->type != OPTION_END; options++) {
 282                 if (!(options->flags & PARSE_OPT_NODASH))
 283                         continue;
 284                 if ((options->flags & PARSE_OPT_OPTARG) ||
 285                     !(options->flags & PARSE_OPT_NOARG))
 286                         die("BUG: dashless options don't support arguments");
 287                 if (!(options->flags & PARSE_OPT_NONEG))
 288                         die("BUG: dashless options don't support negation");
 289                 if (options->long_name)
 290                         die("BUG: dashless options can't be long");
 291                 if (options->short_name == arg[0] && arg[1] == '\0')
 292                         return get_value(p, options, OPT_SHORT);
 293         }
 294         return -2;
 295 }
 296
 297 static void check_typos(const char *arg, const struct option *options)
 298 {
 299         if (strlen(arg) < 3)
 300                 return;
 301
 302         if (!prefixcmp(arg, "no-")) {
 303                 error ("did you mean `--%s` (with two dashes ?)", arg);
 304                 exit(129);
 305         }
 306
 307         for (; options->type != OPTION_END; options++) {
 308                 if (!options->long_name)
 309                         continue;
 310                 if (!prefixcmp(options->long_name, arg)) {
 311                         error ("did you mean `--%s` (with two dashes ?)", arg);
 312                         exit(129);
 313                 }
 314         }
 315 }
 316
 317 static void parse_options_check(const struct option *opts)
 318 {
 319         int err = 0;
 320
 321         for (; opts->type != OPTION_END; opts++) {
 322                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 323                     (opts->flags & PARSE_OPT_OPTARG)) {
 324                         if (opts->long_name) {
 325                                 error("`--%s` uses incompatible flags "
 326                                       "LASTARG_DEFAULT and OPTARG", opts->long_name);
 327                         } else {
 328                                 error("`-%c` uses incompatible flags "
 329                                       "LASTARG_DEFAULT and OPTARG", opts->short_name);
 330                         }
 331                         err |= 1;
 332                 }
 333         }
 334
 335         if (err)
 336                 exit(129);
 337 }
 338
 339 void parse_options_start(struct parse_opt_ctx_t *ctx,
 340                          int argc, const char **argv, const char *prefix,
 341                          int flags)
 342 {
 343         memset(ctx, 0, sizeof(*ctx));
 344         ctx->argc = argc - 1;
 345         ctx->argv = argv + 1;
 346         ctx->out  = argv;
 347         ctx->prefix = prefix;
 348         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 349         ctx->flags = flags;
 350         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 351             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 352                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 353 }
 354
 355 static int usage_with_options_internal(struct parse_opt_ctx_t *,
 356                                        const char * const *,
 357                                        const struct option *, int, int);
 358
 359 int parse_options_step(struct parse_opt_ctx_t *ctx,
 360                        const struct option *options,
 361                        const char * const usagestr[])
 362 {
 363         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 364
 365         parse_options_check(options);
 366
 367         /* we must reset ->opt, unknown short option leave it dangling */
 368         ctx->opt = NULL;
 369
 370         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 371                 const char *arg = ctx->argv[0];
 372
 373                 if (*arg != '-' || !arg[1]) {
 374                         if (parse_nodash_opt(ctx, arg, options) == 0)
 375                                 continue;
 376                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 377                                 break;
 378                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 379                         continue;
 380                 }
 381
 382                 if (arg[1] != '-') {
 383                         ctx->opt = arg + 1;
 384                         if (internal_help && *ctx->opt == 'h')
 385                                 return parse_options_usage(ctx, usagestr, options, 0);
 386                         switch (parse_short_opt(ctx, options)) {
 387                         case -1:
 388                                 return parse_options_usage(ctx, usagestr, options, 1);
 389                         case -2:
 390                                 goto unknown;
 391                         }
 392                         if (ctx->opt)
 393                                 check_typos(arg + 1, options);
 394                         while (ctx->opt) {
 395                                 if (internal_help && *ctx->opt == 'h')
 396                                         return parse_options_usage(ctx, usagestr, options, 0);
 397                                 switch (parse_short_opt(ctx, options)) {
 398                                 case -1:
 399                                         return parse_options_usage(ctx, usagestr, options, 1);
 400                                 case -2:
 401                                         /* fake a short option thing to hide the fact that we may have
 402                                          * started to parse aggregated stuff
 403                                          *
 404                                          * This is leaky, too bad.
 405                                          */
 406                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 407                                         *(char *)ctx->argv[0] = '-';
 408                                         goto unknown;
 409                                 }
 410                         }
 411                         continue;
 412                 }
 413
 414                 if (!arg[2]) { /* "--" */
 415                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 416                                 ctx->argc--;
 417                                 ctx->argv++;
 418                         }
 419                         break;
 420                 }
 421
 422                 if (internal_help && !strcmp(arg + 2, "help-all"))
 423                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 424                 if (internal_help && !strcmp(arg + 2, "help"))
 425                         return parse_options_usage(ctx, usagestr, options, 0);
 426                 switch (parse_long_opt(ctx, arg + 2, options)) {
 427                 case -1:
 428                         return parse_options_usage(ctx, usagestr, options, 1);
 429                 case -2:
 430                         goto unknown;
 431                 }
 432                 continue;
 433 unknown:
 434                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 435                         return PARSE_OPT_UNKNOWN;
 436                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 437                 ctx->opt = NULL;
 438         }
 439         return PARSE_OPT_DONE;
 440 }
 441
 442 int parse_options_end(struct parse_opt_ctx_t *ctx)
 443 {
 444         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 445         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 446         return ctx->cpidx + ctx->argc;
 447 }
 448
 449 int parse_options(int argc, const char **argv, const char *prefix,
 450                   const struct option *options, const char * const usagestr[],
 451                   int flags)
 452 {
 453         struct parse_opt_ctx_t ctx;
 454
 455         parse_options_start(&ctx, argc, argv, prefix, flags);
 456         switch (parse_options_step(&ctx, options, usagestr)) {
 457         case PARSE_OPT_HELP:
 458                 exit(129);
 459         case PARSE_OPT_DONE:
 460                 break;
 461         default: /* PARSE_OPT_UNKNOWN */
 462                 if (ctx.argv[0][1] == '-') {
 463                         error("unknown option `%s'", ctx.argv[0] + 2);
 464                 } else {
 465                         error("unknown switch `%c'", *ctx.opt);
 466                 }
 467                 usage_with_options(usagestr, options);
 468         }
 469
 470         return parse_options_end(&ctx);
 471 }
 472
 473 static int usage_argh(const struct option *opts, FILE *outfile)
 474 {
 475         const char *s;
 476         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 477         if (opts->flags & PARSE_OPT_OPTARG)
 478                 if (opts->long_name)
 479                         s = literal ? "[=%s]" : "[=<%s>]";
 480                 else
 481                         s = literal ? "[%s]" : "[<%s>]";
 482         else
 483                 s = literal ? " %s" : " <%s>";
 484         return fprintf(outfile, s, opts->argh ? opts->argh : "...");
 485 }
 486
 487 #define USAGE_OPTS_WIDTH 24
 488 #define USAGE_GAP         2
 489
 490 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 491                                        const char * const *usagestr,
 492                                        const struct option *opts, int full, int err)
 493 {
 494         FILE *outfile = err ? stderr : stdout;
 495
 496         if (!usagestr)
 497                 return PARSE_OPT_HELP;
 498
 499         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 500                 fprintf(outfile, "cat <<\\EOF\n");
 501
 502         fprintf(outfile, "usage: %s\n", *usagestr++);
 503         while (*usagestr && **usagestr)
 504                 fprintf(outfile, "   or: %s\n", *usagestr++);
 505         while (*usagestr) {
 506                 fprintf(outfile, "%s%s\n",
 507                                 **usagestr ? "    " : "",
 508                                 *usagestr);
 509                 usagestr++;
 510         }
 511
 512         if (opts->type != OPTION_GROUP)
 513                 fputc('\n', outfile);
 514
 515         for (; opts->type != OPTION_END; opts++) {
 516                 size_t pos;
 517                 int pad;
 518
 519                 if (opts->type == OPTION_GROUP) {
 520                         fputc('\n', outfile);
 521                         if (*opts->help)
 522                                 fprintf(outfile, "%s\n", opts->help);
 523                         continue;
 524                 }
 525                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 526                         continue;
 527
 528                 pos = fprintf(outfile, "    ");
 529                 if (opts->short_name && !(opts->flags & PARSE_OPT_NEGHELP)) {
 530                         if (opts->flags & PARSE_OPT_NODASH)
 531                                 pos += fprintf(outfile, "%c", opts->short_name);
 532                         else
 533                                 pos += fprintf(outfile, "-%c", opts->short_name);
 534                 }
 535                 if (opts->long_name && opts->short_name)
 536                         pos += fprintf(outfile, ", ");
 537                 if (opts->long_name)
 538                         pos += fprintf(outfile, "--%s%s",
 539                                 (opts->flags & PARSE_OPT_NEGHELP) ?  "no-" : "",
 540                                 opts->long_name);
 541                 if (opts->type == OPTION_NUMBER)
 542                         pos += fprintf(outfile, "-NUM");
 543
 544                 if (!(opts->flags & PARSE_OPT_NOARG))
 545                         pos += usage_argh(opts, outfile);
 546
 547                 if (pos <= USAGE_OPTS_WIDTH)
 548                         pad = USAGE_OPTS_WIDTH - pos;
 549                 else {
 550                         fputc('\n', outfile);
 551                         pad = USAGE_OPTS_WIDTH;
 552                 }
 553                 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 554         }
 555         fputc('\n', outfile);
 556
 557         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 558                 fputs("EOF\n", outfile);
 559
 560         return PARSE_OPT_HELP;
 561 }
 562
 563 void usage_with_options(const char * const *usagestr,
 564                         const struct option *opts)
 565 {
 566         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 567         exit(129);
 568 }
 569
 570 void usage_msg_opt(const char *msg,
 571                    const char * const *usagestr,
 572                    const struct option *options)
 573 {
 574         fprintf(stderr, "%s\n\n", msg);
 575         usage_with_options(usagestr, options);
 576 }
 577
 578 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
 579                                const char * const *usagestr,
 580                                const struct option *opts, int err)
 581 {
 582         return usage_with_options_internal(ctx, usagestr, opts, 0, err);
 583 }
 584
 585
 586 /*----- some often used options -----*/
 587 #include "cache.h"
 588
 589 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 590 {
 591         int v;
 592
 593         if (!arg) {
 594                 v = unset ? 0 : DEFAULT_ABBREV;
 595         } else {
 596                 v = strtol(arg, (char **)&arg, 10);
 597                 if (*arg)
 598                         return opterror(opt, "expects a numerical value", 0);
 599                 if (v && v < MINIMUM_ABBREV)
 600                         v = MINIMUM_ABBREV;
 601                 else if (v > 40)
 602                         v = 40;
 603         }
 604         *(int *)(opt->value) = v;
 605         return 0;
 606 }
 607
 608 int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
 609                              int unset)
 610 {
 611         *(unsigned long *)(opt->value) = approxidate(arg);
 612         return 0;
 613 }
 614
 615 int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
 616                             int unset)
 617 {
 618         int value;
 619
 620         if (!arg)
 621                 arg = unset ? "never" : (const char *)opt->defval;
 622         value = git_config_colorbool(NULL, arg, -1);
 623         if (value < 0)
 624                 return opterror(opt,
 625                         "expects \"always\", \"auto\", or \"never\"", 0);
 626         *(int *)opt->value = value;
 627         return 0;
 628 }
 629
 630 int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
 631                            int unset)
 632 {
 633         int *target = opt->value;
 634
 635         if (unset)
 636                 /* --no-quiet, --no-verbose */
 637                 *target = 0;
 638         else if (opt->short_name == 'v') {
 639                 if (*target >= 0)
 640                         (*target)++;
 641                 else
 642                         *target = 1;
 643         } else {
 644                 if (*target <= 0)
 645                         (*target)--;
 646                 else
 647                         *target = -1;
 648         }
 649         return 0;
 650 }
 651
 652 int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
 653 {
 654         unsigned char sha1[20];
 655         struct commit *commit;
 656
 657         if (!arg)
 658                 return -1;
 659         if (get_sha1(arg, sha1))
 660                 return error("malformed object name %s", arg);
 661         commit = lookup_commit_reference(sha1);
 662         if (!commit)
 663                 return error("no such commit %s", arg);
 664         commit_list_insert(commit, opt->value);
 665         return 0;
 666 }
 667
 668 int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
 669 {
 670         int *target = opt->value;
 671         *target = unset ? 2 : 1;
 672         return 0;
 673 }
 674
 675 int parse_options_concat(struct option *dst, size_t dst_size, struct option *src)
 676 {
 677         int i, j;
 678
 679         for (i = 0; i < dst_size; i++)
 680                 if (dst[i].type == OPTION_END)
 681                         break;
 682         for (j = 0; i < dst_size; i++, j++) {
 683                 dst[i] = src[j];
 684                 if (src[j].type == OPTION_END)
 685                         return 0;
 686         }
 687         return -1;
 688 }