Andrew's git - gitweb.git/blob

   1#include "git-compat-util.h"
   2#include "parse-options.h"
   3
   4#define OPT_SHORT 1
   5#define OPT_UNSET 2
   6
   7struct optparse_t {
   8        const char **argv;
   9        int argc;
  10        const char *opt;
  11};
  12
  13static inline const char *get_arg(struct optparse_t *p)
  14{
  15        if (p->opt) {
  16                const char *res = p->opt;
  17                p->opt = NULL;
  18                return res;
  19        }
  20        p->argc--;
  21        return *++p->argv;
  22}
  23
  24static inline const char *skip_prefix(const char *str, const char *prefix)
  25{
  26        size_t len = strlen(prefix);
  27        return strncmp(str, prefix, len) ? NULL : str + len;
  28}
  29
  30static int opterror(const struct option *opt, const char *reason, int flags)
  31{
  32        if (flags & OPT_SHORT)
  33                return error("switch `%c' %s", opt->short_name, reason);
  34        if (flags & OPT_UNSET)
  35                return error("option `no-%s' %s", opt->long_name, reason);
  36        return error("option `%s' %s", opt->long_name, reason);
  37}
  38
  39static int get_value(struct optparse_t *p,
  40                     const struct option *opt, int flags)
  41{
  42        const char *s, *arg;
  43        const int unset = flags & OPT_UNSET;
  44
  45        if (unset && p->opt)
  46                return opterror(opt, "takes no value", flags);
  47        if (unset && (opt->flags & PARSE_OPT_NONEG))
  48                return opterror(opt, "isn't available", flags);
  49
  50        if (!(flags & OPT_SHORT) && p->opt) {
  51                switch (opt->type) {
  52                case OPTION_CALLBACK:
  53                        if (!(opt->flags & PARSE_OPT_NOARG))
  54                                break;
  55                        /* FALLTHROUGH */
  56                case OPTION_BOOLEAN:
  57                case OPTION_BIT:
  58                case OPTION_SET_INT:
  59                case OPTION_SET_PTR:
  60                        return opterror(opt, "takes no value", flags);
  61                default:
  62                        break;
  63                }
  64        }
  65
  66        arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
  67        switch (opt->type) {
  68        case OPTION_BIT:
  69                if (unset)
  70                        *(int *)opt->value &= ~opt->defval;
  71                else
  72                        *(int *)opt->value |= opt->defval;
  73                return 0;
  74
  75        case OPTION_BOOLEAN:
  76                *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
  77                return 0;
  78
  79        case OPTION_SET_INT:
  80                *(int *)opt->value = unset ? 0 : opt->defval;
  81                return 0;
  82
  83        case OPTION_SET_PTR:
  84                *(void **)opt->value = unset ? NULL : (void *)opt->defval;
  85                return 0;
  86
  87        case OPTION_STRING:
  88                if (unset) {
  89                        *(const char **)opt->value = NULL;
  90                        return 0;
  91                }
  92                if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-')) {
  93                        *(const char **)opt->value = (const char *)opt->defval;
  94                        return 0;
  95                }
  96                if (!arg)
  97                        return opterror(opt, "requires a value", flags);
  98                *(const char **)opt->value = get_arg(p);
  99                return 0;
 100
 101        case OPTION_CALLBACK:
 102                if (unset)
 103                        return (*opt->callback)(opt, NULL, 1);
 104                if (opt->flags & PARSE_OPT_NOARG)
 105                        return (*opt->callback)(opt, NULL, 0);
 106                if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-'))
 107                        return (*opt->callback)(opt, NULL, 0);
 108                if (!arg)
 109                        return opterror(opt, "requires a value", flags);
 110                return (*opt->callback)(opt, get_arg(p), 0);
 111
 112        case OPTION_INTEGER:
 113                if (unset) {
 114                        *(int *)opt->value = 0;
 115                        return 0;
 116                }
 117                if (opt->flags & PARSE_OPT_OPTARG && (!arg || !isdigit(*arg))) {
 118                        *(int *)opt->value = opt->defval;
 119                        return 0;
 120                }
 121                if (!arg)
 122                        return opterror(opt, "requires a value", flags);
 123                *(int *)opt->value = strtol(get_arg(p), (char **)&s, 10);
 124                if (*s)
 125                        return opterror(opt, "expects a numerical value", flags);
 126                return 0;
 127
 128        default:
 129                die("should not happen, someone must be hit on the forehead");
 130        }
 131}
 132
 133static int parse_short_opt(struct optparse_t *p, const struct option *options)
 134{
 135        for (; options->type != OPTION_END; options++) {
 136                if (options->short_name == *p->opt) {
 137                        p->opt = p->opt[1] ? p->opt + 1 : NULL;
 138                        return get_value(p, options, OPT_SHORT);
 139                }
 140        }
 141        return error("unknown switch `%c'", *p->opt);
 142}
 143
 144static int parse_long_opt(struct optparse_t *p, const char *arg,
 145                          const struct option *options)
 146{
 147        const char *arg_end = strchr(arg, '=');
 148        const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
 149        int abbrev_flags = 0, ambiguous_flags = 0;
 150
 151        if (!arg_end)
 152                arg_end = arg + strlen(arg);
 153
 154        for (; options->type != OPTION_END; options++) {
 155                const char *rest;
 156                int flags = 0;
 157
 158                if (!options->long_name)
 159                        continue;
 160
 161                rest = skip_prefix(arg, options->long_name);
 162                if (!rest) {
 163                        /* abbreviated? */
 164                        if (!strncmp(options->long_name, arg, arg_end - arg)) {
 165is_abbreviated:
 166                                if (abbrev_option) {
 167                                        /*
 168                                         * If this is abbreviated, it is
 169                                         * ambiguous. So when there is no
 170                                         * exact match later, we need to
 171                                         * error out.
 172                                         */
 173                                        ambiguous_option = abbrev_option;
 174                                        ambiguous_flags = abbrev_flags;
 175                                }
 176                                if (!(flags & OPT_UNSET) && *arg_end)
 177                                        p->opt = arg_end + 1;
 178                                abbrev_option = options;
 179                                abbrev_flags = flags;
 180                                continue;
 181                        }
 182                        /* negated and abbreviated very much? */
 183                        if (!prefixcmp("no-", arg)) {
 184                                flags |= OPT_UNSET;
 185                                goto is_abbreviated;
 186                        }
 187                        /* negated? */
 188                        if (strncmp(arg, "no-", 3))
 189                                continue;
 190                        flags |= OPT_UNSET;
 191                        rest = skip_prefix(arg + 3, options->long_name);
 192                        /* abbreviated and negated? */
 193                        if (!rest && !prefixcmp(options->long_name, arg + 3))
 194                                goto is_abbreviated;
 195                        if (!rest)
 196                                continue;
 197                }
 198                if (*rest) {
 199                        if (*rest != '=')
 200                                continue;
 201                        p->opt = rest + 1;
 202                }
 203                return get_value(p, options, flags);
 204        }
 205
 206        if (ambiguous_option)
 207                return error("Ambiguous option: %s "
 208                        "(could be --%s%s or --%s%s)",
 209                        arg,
 210                        (ambiguous_flags & OPT_UNSET) ?  "no-" : "",
 211                        ambiguous_option->long_name,
 212                        (abbrev_flags & OPT_UNSET) ?  "no-" : "",
 213                        abbrev_option->long_name);
 214        if (abbrev_option)
 215                return get_value(p, abbrev_option, abbrev_flags);
 216        return error("unknown option `%s'", arg);
 217}
 218
 219int parse_options(int argc, const char **argv, const struct option *options,
 220                  const char * const usagestr[], int flags)
 221{
 222        struct optparse_t args = { argv + 1, argc - 1, NULL };
 223        int j = 0;
 224
 225        for (; args.argc; args.argc--, args.argv++) {
 226                const char *arg = args.argv[0];
 227
 228                if (*arg != '-' || !arg[1]) {
 229                        argv[j++] = args.argv[0];
 230                        continue;
 231                }
 232
 233                if (arg[1] != '-') {
 234                        args.opt = arg + 1;
 235                        do {
 236                                if (*args.opt == 'h')
 237                                        usage_with_options(usagestr, options);
 238                                if (parse_short_opt(&args, options) < 0)
 239                                        usage_with_options(usagestr, options);
 240                        } while (args.opt);
 241                        continue;
 242                }
 243
 244                if (!arg[2]) { /* "--" */
 245                        if (!(flags & PARSE_OPT_KEEP_DASHDASH)) {
 246                                args.argc--;
 247                                args.argv++;
 248                        }
 249                        break;
 250                }
 251
 252                if (!strcmp(arg + 2, "help"))
 253                        usage_with_options(usagestr, options);
 254                if (parse_long_opt(&args, arg + 2, options))
 255                        usage_with_options(usagestr, options);
 256        }
 257
 258        memmove(argv + j, args.argv, args.argc * sizeof(*argv));
 259        argv[j + args.argc] = NULL;
 260        return j + args.argc;
 261}
 262
 263#define USAGE_OPTS_WIDTH 24
 264#define USAGE_GAP         2
 265
 266void usage_with_options(const char * const *usagestr,
 267                        const struct option *opts)
 268{
 269        fprintf(stderr, "usage: %s\n", *usagestr++);
 270        while (*usagestr && **usagestr)
 271                fprintf(stderr, "   or: %s\n", *usagestr++);
 272        while (*usagestr)
 273                fprintf(stderr, "    %s\n", *usagestr++);
 274
 275        if (opts->type != OPTION_GROUP)
 276                fputc('\n', stderr);
 277
 278        for (; opts->type != OPTION_END; opts++) {
 279                size_t pos;
 280                int pad;
 281
 282                if (opts->type == OPTION_GROUP) {
 283                        fputc('\n', stderr);
 284                        if (*opts->help)
 285                                fprintf(stderr, "%s\n", opts->help);
 286                        continue;
 287                }
 288
 289                pos = fprintf(stderr, "    ");
 290                if (opts->short_name)
 291                        pos += fprintf(stderr, "-%c", opts->short_name);
 292                if (opts->long_name && opts->short_name)
 293                        pos += fprintf(stderr, ", ");
 294                if (opts->long_name)
 295                        pos += fprintf(stderr, "--%s", opts->long_name);
 296
 297                switch (opts->type) {
 298                case OPTION_INTEGER:
 299                        if (opts->flags & PARSE_OPT_OPTARG)
 300                                pos += fprintf(stderr, " [<n>]");
 301                        else
 302                                pos += fprintf(stderr, " <n>");
 303                        break;
 304                case OPTION_CALLBACK:
 305                        if (opts->flags & PARSE_OPT_NOARG)
 306                                break;
 307                        /* FALLTHROUGH */
 308                case OPTION_STRING:
 309                        if (opts->argh) {
 310                                if (opts->flags & PARSE_OPT_OPTARG)
 311                                        pos += fprintf(stderr, " [<%s>]", opts->argh);
 312                                else
 313                                        pos += fprintf(stderr, " <%s>", opts->argh);
 314                        } else {
 315                                if (opts->flags & PARSE_OPT_OPTARG)
 316                                        pos += fprintf(stderr, " [...]");
 317                                else
 318                                        pos += fprintf(stderr, " ...");
 319                        }
 320                        break;
 321                default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
 322                        break;
 323                }
 324
 325                if (pos <= USAGE_OPTS_WIDTH)
 326                        pad = USAGE_OPTS_WIDTH - pos;
 327                else {
 328                        fputc('\n', stderr);
 329                        pad = USAGE_OPTS_WIDTH;
 330                }
 331                fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 332        }
 333        fputc('\n', stderr);
 334
 335        exit(129);
 336}
 337
 338/*----- some often used options -----*/
 339#include "cache.h"
 340
 341int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 342{
 343        int v;
 344
 345        if (!arg) {
 346                v = unset ? 0 : DEFAULT_ABBREV;
 347        } else {
 348                v = strtol(arg, (char **)&arg, 10);
 349                if (*arg)
 350                        return opterror(opt, "expects a numerical value", 0);
 351                if (v && v < MINIMUM_ABBREV)
 352                        v = MINIMUM_ABBREV;
 353                else if (v > 40)
 354                        v = 40;
 355        }
 356        *(int *)(opt->value) = v;
 357        return 0;
 358}