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