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->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                         err |= optbug(opts, "uses incompatible flags "
 325                                         "LASTARG_DEFAULT and OPTARG");
 326                 if (opts->flags & PARSE_OPT_NODASH &&
 327                     ((opts->flags & PARSE_OPT_OPTARG) ||
 328                      !(opts->flags & PARSE_OPT_NOARG) ||
 329                      !(opts->flags & PARSE_OPT_NONEG) ||
 330                      opts->long_name))
 331                         err |= optbug(opts, "uses feature "
 332                                         "not supported for dashless options");
 333                 switch (opts->type) {
 334                 case OPTION_BOOLEAN:
 335                 case OPTION_BIT:
 336                 case OPTION_NEGBIT:
 337                 case OPTION_SET_INT:
 338                 case OPTION_SET_PTR:
 339                 case OPTION_NUMBER:
 340                         if ((opts->flags & PARSE_OPT_OPTARG) ||
 341                             !(opts->flags & PARSE_OPT_NOARG))
 342                                 err |= optbug(opts, "should not accept an argument");
 343                 default:
 344                         ; /* ok. (usually accepts an argument) */
 345                 }
 346         }
 347         if (err)
 348                 exit(128);
 349 }
 350
 351 void parse_options_start(struct parse_opt_ctx_t *ctx,
 352                          int argc, const char **argv, const char *prefix,
 353                          const struct option *options, int flags)
 354 {
 355         memset(ctx, 0, sizeof(*ctx));
 356         ctx->argc = argc - 1;
 357         ctx->argv = argv + 1;
 358         ctx->out  = argv;
 359         ctx->prefix = prefix;
 360         ctx->cpidx = ((flags & PARSE_OPT_KEEP_ARGV0) != 0);
 361         ctx->flags = flags;
 362         if ((flags & PARSE_OPT_KEEP_UNKNOWN) &&
 363             (flags & PARSE_OPT_STOP_AT_NON_OPTION))
 364                 die("STOP_AT_NON_OPTION and KEEP_UNKNOWN don't go together");
 365         parse_options_check(options);
 366 }
 367
 368 static int usage_with_options_internal(struct parse_opt_ctx_t *,
 369                                        const char * const *,
 370                                        const struct option *, int, int);
 371
 372 int parse_options_step(struct parse_opt_ctx_t *ctx,
 373                        const struct option *options,
 374                        const char * const usagestr[])
 375 {
 376         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 377
 378         /* we must reset ->opt, unknown short option leave it dangling */
 379         ctx->opt = NULL;
 380
 381         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 382                 const char *arg = ctx->argv[0];
 383
 384                 if (*arg != '-' || !arg[1]) {
 385                         if (parse_nodash_opt(ctx, arg, options) == 0)
 386                                 continue;
 387                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 388                                 break;
 389                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 390                         continue;
 391                 }
 392
 393                 if (arg[1] != '-') {
 394                         ctx->opt = arg + 1;
 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                                 goto unknown;
 402                         }
 403                         if (ctx->opt)
 404                                 check_typos(arg + 1, options);
 405                         while (ctx->opt) {
 406                                 if (internal_help && *ctx->opt == 'h')
 407                                         return parse_options_usage(ctx, usagestr, options, 0);
 408                                 switch (parse_short_opt(ctx, options)) {
 409                                 case -1:
 410                                         return parse_options_usage(ctx, usagestr, options, 1);
 411                                 case -2:
 412                                         /* fake a short option thing to hide the fact that we may have
 413                                          * started to parse aggregated stuff
 414                                          *
 415                                          * This is leaky, too bad.
 416                                          */
 417                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 418                                         *(char *)ctx->argv[0] = '-';
 419                                         goto unknown;
 420                                 }
 421                         }
 422                         continue;
 423                 }
 424
 425                 if (!arg[2]) { /* "--" */
 426                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 427                                 ctx->argc--;
 428                                 ctx->argv++;
 429                         }
 430                         break;
 431                 }
 432
 433                 if (internal_help && !strcmp(arg + 2, "help-all"))
 434                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 435                 if (internal_help && !strcmp(arg + 2, "help"))
 436                         return parse_options_usage(ctx, usagestr, options, 0);
 437                 switch (parse_long_opt(ctx, arg + 2, options)) {
 438                 case -1:
 439                         return parse_options_usage(ctx, usagestr, options, 1);
 440                 case -2:
 441                         goto unknown;
 442                 }
 443                 continue;
 444 unknown:
 445                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 446                         return PARSE_OPT_UNKNOWN;
 447                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 448                 ctx->opt = NULL;
 449         }
 450         return PARSE_OPT_DONE;
 451 }
 452
 453 int parse_options_end(struct parse_opt_ctx_t *ctx)
 454 {
 455         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 456         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 457         return ctx->cpidx + ctx->argc;
 458 }
 459
 460 int parse_options(int argc, const char **argv, const char *prefix,
 461                   const struct option *options, const char * const usagestr[],
 462                   int flags)
 463 {
 464         struct parse_opt_ctx_t ctx;
 465
 466         parse_options_start(&ctx, argc, argv, prefix, options, flags);
 467         switch (parse_options_step(&ctx, options, usagestr)) {
 468         case PARSE_OPT_HELP:
 469                 exit(129);
 470         case PARSE_OPT_DONE:
 471                 break;
 472         default: /* PARSE_OPT_UNKNOWN */
 473                 if (ctx.argv[0][1] == '-') {
 474                         error("unknown option `%s'", ctx.argv[0] + 2);
 475                 } else {
 476                         error("unknown switch `%c'", *ctx.opt);
 477                 }
 478                 usage_with_options(usagestr, options);
 479         }
 480
 481         return parse_options_end(&ctx);
 482 }
 483
 484 static int usage_argh(const struct option *opts, FILE *outfile)
 485 {
 486         const char *s;
 487         int literal = (opts->flags & PARSE_OPT_LITERAL_ARGHELP) || !opts->argh;
 488         if (opts->flags & PARSE_OPT_OPTARG)
 489                 if (opts->long_name)
 490                         s = literal ? "[=%s]" : "[=<%s>]";
 491                 else
 492                         s = literal ? "[%s]" : "[<%s>]";
 493         else
 494                 s = literal ? " %s" : " <%s>";
 495         return fprintf(outfile, s, opts->argh ? opts->argh : "...");
 496 }
 497
 498 #define USAGE_OPTS_WIDTH 24
 499 #define USAGE_GAP         2
 500
 501 static int usage_with_options_internal(struct parse_opt_ctx_t *ctx,
 502                                        const char * const *usagestr,
 503                                        const struct option *opts, int full, int err)
 504 {
 505         FILE *outfile = err ? stderr : stdout;
 506
 507         if (!usagestr)
 508                 return PARSE_OPT_HELP;
 509
 510         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 511                 fprintf(outfile, "cat <<\\EOF\n");
 512
 513         fprintf(outfile, "usage: %s\n", *usagestr++);
 514         while (*usagestr && **usagestr)
 515                 fprintf(outfile, "   or: %s\n", *usagestr++);
 516         while (*usagestr) {
 517                 fprintf(outfile, "%s%s\n",
 518                                 **usagestr ? "    " : "",
 519                                 *usagestr);
 520                 usagestr++;
 521         }
 522
 523         if (opts->type != OPTION_GROUP)
 524                 fputc('\n', outfile);
 525
 526         for (; opts->type != OPTION_END; opts++) {
 527                 size_t pos;
 528                 int pad;
 529
 530                 if (opts->type == OPTION_GROUP) {
 531                         fputc('\n', outfile);
 532                         if (*opts->help)
 533                                 fprintf(outfile, "%s\n", opts->help);
 534                         continue;
 535                 }
 536                 if (!full && (opts->flags & PARSE_OPT_HIDDEN))
 537                         continue;
 538
 539                 pos = fprintf(outfile, "    ");
 540                 if (opts->short_name && !(opts->flags & PARSE_OPT_NEGHELP)) {
 541                         if (opts->flags & PARSE_OPT_NODASH)
 542                                 pos += fprintf(outfile, "%c", opts->short_name);
 543                         else
 544                                 pos += fprintf(outfile, "-%c", opts->short_name);
 545                 }
 546                 if (opts->long_name && opts->short_name)
 547                         pos += fprintf(outfile, ", ");
 548                 if (opts->long_name)
 549                         pos += fprintf(outfile, "--%s%s",
 550                                 (opts->flags & PARSE_OPT_NEGHELP) ?  "no-" : "",
 551                                 opts->long_name);
 552                 if (opts->type == OPTION_NUMBER)
 553                         pos += fprintf(outfile, "-NUM");
 554
 555                 if (!(opts->flags & PARSE_OPT_NOARG))
 556                         pos += usage_argh(opts, outfile);
 557
 558                 if (pos <= USAGE_OPTS_WIDTH)
 559                         pad = USAGE_OPTS_WIDTH - pos;
 560                 else {
 561                         fputc('\n', outfile);
 562                         pad = USAGE_OPTS_WIDTH;
 563                 }
 564                 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 565         }
 566         fputc('\n', outfile);
 567
 568         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 569                 fputs("EOF\n", outfile);
 570
 571         return PARSE_OPT_HELP;
 572 }
 573
 574 void usage_with_options(const char * const *usagestr,
 575                         const struct option *opts)
 576 {
 577         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 578         exit(129);
 579 }
 580
 581 void usage_msg_opt(const char *msg,
 582                    const char * const *usagestr,
 583                    const struct option *options)
 584 {
 585         fprintf(stderr, "%s\n\n", msg);
 586         usage_with_options(usagestr, options);
 587 }
 588
 589 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
 590                                const char * const *usagestr,
 591                                const struct option *opts, int err)
 592 {
 593         return usage_with_options_internal(ctx, usagestr, opts, 0, err);
 594 }
 595
 596
 597 /*----- some often used options -----*/
 598 #include "cache.h"
 599
 600 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 601 {
 602         int v;
 603
 604         if (!arg) {
 605                 v = unset ? 0 : DEFAULT_ABBREV;
 606         } else {
 607                 v = strtol(arg, (char **)&arg, 10);
 608                 if (*arg)
 609                         return opterror(opt, "expects a numerical value", 0);
 610                 if (v && v < MINIMUM_ABBREV)
 611                         v = MINIMUM_ABBREV;
 612                 else if (v > 40)
 613                         v = 40;
 614         }
 615         *(int *)(opt->value) = v;
 616         return 0;
 617 }
 618
 619 int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
 620                              int unset)
 621 {
 622         *(unsigned long *)(opt->value) = approxidate(arg);
 623         return 0;
 624 }
 625
 626 int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
 627                             int unset)
 628 {
 629         int value;
 630
 631         if (!arg)
 632                 arg = unset ? "never" : (const char *)opt->defval;
 633         value = git_config_colorbool(NULL, arg, -1);
 634         if (value < 0)
 635                 return opterror(opt,
 636                         "expects \"always\", \"auto\", or \"never\"", 0);
 637         *(int *)opt->value = value;
 638         return 0;
 639 }
 640
 641 int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
 642                            int unset)
 643 {
 644         int *target = opt->value;
 645
 646         if (unset)
 647                 /* --no-quiet, --no-verbose */
 648                 *target = 0;
 649         else if (opt->short_name == 'v') {
 650                 if (*target >= 0)
 651                         (*target)++;
 652                 else
 653                         *target = 1;
 654         } else {
 655                 if (*target <= 0)
 656                         (*target)--;
 657                 else
 658                         *target = -1;
 659         }
 660         return 0;
 661 }
 662
 663 int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
 664 {
 665         unsigned char sha1[20];
 666         struct commit *commit;
 667
 668         if (!arg)
 669                 return -1;
 670         if (get_sha1(arg, sha1))
 671                 return error("malformed object name %s", arg);
 672         commit = lookup_commit_reference(sha1);
 673         if (!commit)
 674                 return error("no such commit %s", arg);
 675         commit_list_insert(commit, opt->value);
 676         return 0;
 677 }
 678
 679 int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
 680 {
 681         int *target = opt->value;
 682         *target = unset ? 2 : 1;
 683         return 0;
 684 }
 685
 686 int parse_options_concat(struct option *dst, size_t dst_size, struct option *src)
 687 {
 688         int i, j;
 689
 690         for (i = 0; i < dst_size; i++)
 691                 if (dst[i].type == OPTION_END)
 692                         break;
 693         for (j = 0; i < dst_size; i++, j++) {
 694                 dst[i] = src[j];
 695                 if (src[j].type == OPTION_END)
 696                         return 0;
 697         }
 698         return -1;
 699 }