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         if (!(flags & OPT_SHORT) && p->opt && (opt->flags & PARSE_OPT_NOARG))
  66                 return opterror(opt, "takes no value", flags);
  67
  68         switch (opt->type) {
  69         case OPTION_LOWLEVEL_CALLBACK:
  70                 return (*(parse_opt_ll_cb *)opt->callback)(p, opt, unset);
  71
  72         case OPTION_BIT:
  73                 if (unset)
  74                         *(int *)opt->value &= ~opt->defval;
  75                 else
  76                         *(int *)opt->value |= opt->defval;
  77                 return 0;
  78
  79         case OPTION_NEGBIT:
  80                 if (unset)
  81                         *(int *)opt->value |= opt->defval;
  82                 else
  83                         *(int *)opt->value &= ~opt->defval;
  84                 return 0;
  85
  86         case OPTION_BOOLEAN:
  87                 *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  88                 return 0;
  89
  90         case OPTION_SET_INT:
  91                 *(int *)opt->value = unset ? 0 : opt->defval;
  92                 return 0;
  93
  94         case OPTION_SET_PTR:
  95                 *(void **)opt->value = unset ? NULL : (void *)opt->defval;
  96                 return 0;
  97
  98         case OPTION_STRING:
  99                 if (unset)
 100                         *(const char **)opt->value = NULL;
 101                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 102                         *(const char **)opt->value = (const char *)opt->defval;
 103                 else
 104                         return get_arg(p, opt, flags, (const char **)opt->value);
 105                 return 0;
 106
 107         case OPTION_FILENAME:
 108                 err = 0;
 109                 if (unset)
 110                         *(const char **)opt->value = NULL;
 111                 else if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 112                         *(const char **)opt->value = (const char *)opt->defval;
 113                 else
 114                         err = get_arg(p, opt, flags, (const char **)opt->value);
 115
 116                 if (!err)
 117                         fix_filename(p->prefix, (const char **)opt->value);
 118                 return err;
 119
 120         case OPTION_CALLBACK:
 121                 if (unset)
 122                         return (*opt->callback)(opt, NULL, 1) ? (-1) : 0;
 123                 if (opt->flags & PARSE_OPT_NOARG)
 124                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 125                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt)
 126                         return (*opt->callback)(opt, NULL, 0) ? (-1) : 0;
 127                 if (get_arg(p, opt, flags, &arg))
 128                         return -1;
 129                 return (*opt->callback)(opt, arg, 0) ? (-1) : 0;
 130
 131         case OPTION_INTEGER:
 132                 if (unset) {
 133                         *(int *)opt->value = 0;
 134                         return 0;
 135                 }
 136                 if (opt->flags & PARSE_OPT_OPTARG && !p->opt) {
 137                         *(int *)opt->value = opt->defval;
 138                         return 0;
 139                 }
 140                 if (get_arg(p, opt, flags, &arg))
 141                         return -1;
 142                 *(int *)opt->value = strtol(arg, (char **)&s, 10);
 143                 if (*s)
 144                         return opterror(opt, "expects a numerical value", flags);
 145                 return 0;
 146
 147         default:
 148                 die("should not happen, someone must be hit on the forehead");
 149         }
 150 }
 151
 152 static int parse_short_opt(struct parse_opt_ctx_t *p, const struct option *options)
 153 {
 154         const struct option *numopt = NULL;
 155
 156         for (; options->type != OPTION_END; options++) {
 157                 if (options->short_name == *p->opt) {
 158                         p->opt = p->opt[1] ? p->opt + 1 : NULL;
 159                         return get_value(p, options, OPT_SHORT);
 160                 }
 161
 162                 /*
 163                  * Handle the numerical option later, explicit one-digit
 164                  * options take precedence over it.
 165                  */
 166                 if (options->type == OPTION_NUMBER)
 167                         numopt = options;
 168         }
 169         if (numopt && isdigit(*p->opt)) {
 170                 size_t len = 1;
 171                 char *arg;
 172                 int rc;
 173
 174                 while (isdigit(p->opt[len]))
 175                         len++;
 176                 arg = xmemdupz(p->opt, len);
 177                 p->opt = p->opt[len] ? p->opt + len : NULL;
 178                 rc = (*numopt->callback)(numopt, arg, 0) ? (-1) : 0;
 179                 free(arg);
 180                 return rc;
 181         }
 182         return -2;
 183 }
 184
 185 static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
 186                           const struct option *options)
 187 {
 188         const char *arg_end = strchr(arg, '=');
 189         const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 190         int abbrev_flags = 0, ambiguous_flags = 0;
 191
 192         if (!arg_end)
 193                 arg_end = arg + strlen(arg);
 194
 195         for (; options->type != OPTION_END; options++) {
 196                 const char *rest;
 197                 int flags = 0;
 198
 199                 if (!options->long_name)
 200                         continue;
 201
 202                 rest = skip_prefix(arg, options->long_name);
 203                 if (options->type == OPTION_ARGUMENT) {
 204                         if (!rest)
 205                                 continue;
 206                         if (*rest == '=')
 207                                 return opterror(options, "takes no value", flags);
 208                         if (*rest)
 209                                 continue;
 210                         p->out[p->cpidx++] = arg - 2;
 211                         return 0;
 212                 }
 213                 if (!rest) {
 214                         /* abbreviated? */
 215                         if (!strncmp(options->long_name, arg, arg_end - arg)) {
 216 is_abbreviated:
 217                                 if (abbrev_option) {
 218                                         /*
 219                                          * If this is abbreviated, it is
 220                                          * ambiguous. So when there is no
 221                                          * exact match later, we need to
 222                                          * error out.
 223                                          */
 224                                         ambiguous_option = abbrev_option;
 225                                         ambiguous_flags = abbrev_flags;
 226                                 }
 227                                 if (!(flags & OPT_UNSET) && *arg_end)
 228                                         p->opt = arg_end + 1;
 229                                 abbrev_option = options;
 230                                 abbrev_flags = flags;
 231                                 continue;
 232                         }
 233                         /* negation allowed? */
 234                         if (options->flags & PARSE_OPT_NONEG)
 235                                 continue;
 236                         /* negated and abbreviated very much? */
 237                         if (!prefixcmp("no-", arg)) {
 238                                 flags |= OPT_UNSET;
 239                                 goto is_abbreviated;
 240                         }
 241                         /* negated? */
 242                         if (strncmp(arg, "no-", 3))
 243                                 continue;
 244                         flags |= OPT_UNSET;
 245                         rest = skip_prefix(arg + 3, options->long_name);
 246                         /* abbreviated and negated? */
 247                         if (!rest && !prefixcmp(options->long_name, arg + 3))
 248                                 goto is_abbreviated;
 249                         if (!rest)
 250                                 continue;
 251                 }
 252                 if (*rest) {
 253                         if (*rest != '=')
 254                                 continue;
 255                         p->opt = rest + 1;
 256                 }
 257                 return get_value(p, options, flags);
 258         }
 259
 260         if (ambiguous_option)
 261                 return error("Ambiguous option: %s "
 262                         "(could be --%s%s or --%s%s)",
 263                         arg,
 264                         (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 265                         ambiguous_option->long_name,
 266                         (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 267                         abbrev_option->long_name);
 268         if (abbrev_option)
 269                 return get_value(p, abbrev_option, abbrev_flags);
 270         return -2;
 271 }
 272
 273 static int parse_nodash_opt(struct parse_opt_ctx_t *p, const char *arg,
 274                             const struct option *options)
 275 {
 276         for (; options->type != OPTION_END; options++) {
 277                 if (!(options->flags & PARSE_OPT_NODASH))
 278                         continue;
 279                 if (options->short_name == arg[0] && arg[1] == '\0')
 280                         return get_value(p, options, OPT_SHORT);
 281         }
 282         return -2;
 283 }
 284
 285 static void check_typos(const char *arg, const struct option *options)
 286 {
 287         if (strlen(arg) < 3)
 288                 return;
 289
 290         if (!prefixcmp(arg, "no-")) {
 291                 error ("did you mean `--%s` (with two dashes ?)", arg);
 292                 exit(129);
 293         }
 294
 295         for (; options->type != OPTION_END; options++) {
 296                 if (!options->long_name)
 297                         continue;
 298                 if (!prefixcmp(options->long_name, arg)) {
 299                         error ("did you mean `--%s` (with two dashes ?)", arg);
 300                         exit(129);
 301                 }
 302         }
 303 }
 304
 305 static void parse_options_check(const struct option *opts)
 306 {
 307         int err = 0;
 308
 309         for (; opts->type != OPTION_END; opts++) {
 310                 if ((opts->flags & PARSE_OPT_LASTARG_DEFAULT) &&
 311                     (opts->flags & PARSE_OPT_OPTARG))
 312                         err |= optbug(opts, "uses incompatible flags "
 313                                         "LASTARG_DEFAULT and OPTARG");
 314                 if (opts->flags & PARSE_OPT_NODASH &&
 315                     ((opts->flags & PARSE_OPT_OPTARG) ||
 316                      !(opts->flags & PARSE_OPT_NOARG) ||
 317                      !(opts->flags & PARSE_OPT_NONEG) ||
 318                      opts->long_name))
 319                         err |= optbug(opts, "uses feature "
 320                                         "not supported for dashless options");
 321                 switch (opts->type) {
 322                 case OPTION_BOOLEAN:
 323                 case OPTION_BIT:
 324                 case OPTION_NEGBIT:
 325                 case OPTION_SET_INT:
 326                 case OPTION_SET_PTR:
 327                 case OPTION_NUMBER:
 328                         if ((opts->flags & PARSE_OPT_OPTARG) ||
 329                             !(opts->flags & PARSE_OPT_NOARG))
 330                                 err |= optbug(opts, "should not accept an argument");
 331                 default:
 332                         ; /* ok. (usually accepts an argument) */
 333                 }
 334         }
 335         if (err)
 336                 exit(128);
 337 }
 338
 339 void parse_options_start(struct parse_opt_ctx_t *ctx,
 340                          int argc, const char **argv, const char *prefix,
 341                          const struct option *options, 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         parse_options_check(options);
 354 }
 355
 356 static int usage_with_options_internal(struct parse_opt_ctx_t *,
 357                                        const char * const *,
 358                                        const struct option *, int, int);
 359
 360 int parse_options_step(struct parse_opt_ctx_t *ctx,
 361                        const struct option *options,
 362                        const char * const usagestr[])
 363 {
 364         int internal_help = !(ctx->flags & PARSE_OPT_NO_INTERNAL_HELP);
 365
 366         /* we must reset ->opt, unknown short option leave it dangling */
 367         ctx->opt = NULL;
 368
 369         for (; ctx->argc; ctx->argc--, ctx->argv++) {
 370                 const char *arg = ctx->argv[0];
 371
 372                 if (*arg != '-' || !arg[1]) {
 373                         if (parse_nodash_opt(ctx, arg, options) == 0)
 374                                 continue;
 375                         if (ctx->flags & PARSE_OPT_STOP_AT_NON_OPTION)
 376                                 return PARSE_OPT_NON_OPTION;
 377                         ctx->out[ctx->cpidx++] = ctx->argv[0];
 378                         continue;
 379                 }
 380
 381                 if (arg[1] != '-') {
 382                         ctx->opt = arg + 1;
 383                         if (internal_help && *ctx->opt == 'h')
 384                                 return parse_options_usage(ctx, usagestr, options, 0);
 385                         switch (parse_short_opt(ctx, options)) {
 386                         case -1:
 387                                 return parse_options_usage(ctx, usagestr, options, 1);
 388                         case -2:
 389                                 goto unknown;
 390                         }
 391                         if (ctx->opt)
 392                                 check_typos(arg + 1, options);
 393                         while (ctx->opt) {
 394                                 if (internal_help && *ctx->opt == 'h')
 395                                         return parse_options_usage(ctx, usagestr, options, 0);
 396                                 switch (parse_short_opt(ctx, options)) {
 397                                 case -1:
 398                                         return parse_options_usage(ctx, usagestr, options, 1);
 399                                 case -2:
 400                                         /* fake a short option thing to hide the fact that we may have
 401                                          * started to parse aggregated stuff
 402                                          *
 403                                          * This is leaky, too bad.
 404                                          */
 405                                         ctx->argv[0] = xstrdup(ctx->opt - 1);
 406                                         *(char *)ctx->argv[0] = '-';
 407                                         goto unknown;
 408                                 }
 409                         }
 410                         continue;
 411                 }
 412
 413                 if (!arg[2]) { /* "--" */
 414                         if (!(ctx->flags & PARSE_OPT_KEEP_DASHDASH)) {
 415                                 ctx->argc--;
 416                                 ctx->argv++;
 417                         }
 418                         break;
 419                 }
 420
 421                 if (internal_help && !strcmp(arg + 2, "help-all"))
 422                         return usage_with_options_internal(ctx, usagestr, options, 1, 0);
 423                 if (internal_help && !strcmp(arg + 2, "help"))
 424                         return parse_options_usage(ctx, usagestr, options, 0);
 425                 switch (parse_long_opt(ctx, arg + 2, options)) {
 426                 case -1:
 427                         return parse_options_usage(ctx, usagestr, options, 1);
 428                 case -2:
 429                         goto unknown;
 430                 }
 431                 continue;
 432 unknown:
 433                 if (!(ctx->flags & PARSE_OPT_KEEP_UNKNOWN))
 434                         return PARSE_OPT_UNKNOWN;
 435                 ctx->out[ctx->cpidx++] = ctx->argv[0];
 436                 ctx->opt = NULL;
 437         }
 438         return PARSE_OPT_DONE;
 439 }
 440
 441 int parse_options_end(struct parse_opt_ctx_t *ctx)
 442 {
 443         memmove(ctx->out + ctx->cpidx, ctx->argv, ctx->argc * sizeof(*ctx->out));
 444         ctx->out[ctx->cpidx + ctx->argc] = NULL;
 445         return ctx->cpidx + ctx->argc;
 446 }
 447
 448 int parse_options(int argc, const char **argv, const char *prefix,
 449                   const struct option *options, const char * const usagestr[],
 450                   int flags)
 451 {
 452         struct parse_opt_ctx_t ctx;
 453
 454         parse_options_start(&ctx, argc, argv, prefix, options, flags);
 455         switch (parse_options_step(&ctx, options, usagestr)) {
 456         case PARSE_OPT_HELP:
 457                 exit(129);
 458         case PARSE_OPT_NON_OPTION:
 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_LITERAL_ARGHELP) ||
 545                     !(opts->flags & PARSE_OPT_NOARG))
 546                         pos += usage_argh(opts, outfile);
 547
 548                 if (pos <= USAGE_OPTS_WIDTH)
 549                         pad = USAGE_OPTS_WIDTH - pos;
 550                 else {
 551                         fputc('\n', outfile);
 552                         pad = USAGE_OPTS_WIDTH;
 553                 }
 554                 fprintf(outfile, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 555         }
 556         fputc('\n', outfile);
 557
 558         if (!err && ctx && ctx->flags & PARSE_OPT_SHELL_EVAL)
 559                 fputs("EOF\n", outfile);
 560
 561         return PARSE_OPT_HELP;
 562 }
 563
 564 void NORETURN usage_with_options(const char * const *usagestr,
 565                         const struct option *opts)
 566 {
 567         usage_with_options_internal(NULL, usagestr, opts, 0, 1);
 568         exit(129);
 569 }
 570
 571 void NORETURN usage_msg_opt(const char *msg,
 572                    const char * const *usagestr,
 573                    const struct option *options)
 574 {
 575         fprintf(stderr, "%s\n\n", msg);
 576         usage_with_options(usagestr, options);
 577 }
 578
 579 static int parse_options_usage(struct parse_opt_ctx_t *ctx,
 580                                const char * const *usagestr,
 581                                const struct option *opts, int err)
 582 {
 583         return usage_with_options_internal(ctx, usagestr, opts, 0, err);
 584 }
 585
 586
 587 /*----- some often used options -----*/
 588 #include "cache.h"
 589
 590 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 591 {
 592         int v;
 593
 594         if (!arg) {
 595                 v = unset ? 0 : DEFAULT_ABBREV;
 596         } else {
 597                 v = strtol(arg, (char **)&arg, 10);
 598                 if (*arg)
 599                         return opterror(opt, "expects a numerical value", 0);
 600                 if (v && v < MINIMUM_ABBREV)
 601                         v = MINIMUM_ABBREV;
 602                 else if (v > 40)
 603                         v = 40;
 604         }
 605         *(int *)(opt->value) = v;
 606         return 0;
 607 }
 608
 609 int parse_opt_approxidate_cb(const struct option *opt, const char *arg,
 610                              int unset)
 611 {
 612         *(unsigned long *)(opt->value) = approxidate(arg);
 613         return 0;
 614 }
 615
 616 int parse_opt_color_flag_cb(const struct option *opt, const char *arg,
 617                             int unset)
 618 {
 619         int value;
 620
 621         if (!arg)
 622                 arg = unset ? "never" : (const char *)opt->defval;
 623         value = git_config_colorbool(NULL, arg, -1);
 624         if (value < 0)
 625                 return opterror(opt,
 626                         "expects \"always\", \"auto\", or \"never\"", 0);
 627         *(int *)opt->value = value;
 628         return 0;
 629 }
 630
 631 int parse_opt_verbosity_cb(const struct option *opt, const char *arg,
 632                            int unset)
 633 {
 634         int *target = opt->value;
 635
 636         if (unset)
 637                 /* --no-quiet, --no-verbose */
 638                 *target = 0;
 639         else if (opt->short_name == 'v') {
 640                 if (*target >= 0)
 641                         (*target)++;
 642                 else
 643                         *target = 1;
 644         } else {
 645                 if (*target <= 0)
 646                         (*target)--;
 647                 else
 648                         *target = -1;
 649         }
 650         return 0;
 651 }
 652
 653 int parse_opt_with_commit(const struct option *opt, const char *arg, int unset)
 654 {
 655         unsigned char sha1[20];
 656         struct commit *commit;
 657
 658         if (!arg)
 659                 return -1;
 660         if (get_sha1(arg, sha1))
 661                 return error("malformed object name %s", arg);
 662         commit = lookup_commit_reference(sha1);
 663         if (!commit)
 664                 return error("no such commit %s", arg);
 665         commit_list_insert(commit, opt->value);
 666         return 0;
 667 }
 668
 669 int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
 670 {
 671         int *target = opt->value;
 672         *target = unset ? 2 : 1;
 673         return 0;
 674 }
 675
 676 int parse_options_concat(struct option *dst, size_t dst_size, struct option *src)
 677 {
 678         int i, j;
 679
 680         for (i = 0; i < dst_size; i++)
 681                 if (dst[i].type == OPTION_END)
 682                         break;
 683         for (j = 0; i < dst_size; i++, j++) {
 684                 dst[i] = src[j];
 685                 if (src[j].type == OPTION_END)
 686                         return 0;
 687         }
 688         return -1;
 689 }