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        arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
  44
  45        if (p->opt && (flags & OPT_UNSET))
  46                return opterror(opt, "takes no value", flags);
  47
  48        switch (opt->type) {
  49        case OPTION_BOOLEAN:
  50                if (!(flags & OPT_SHORT) && p->opt)
  51                        return opterror(opt, "takes no value", flags);
  52                if (flags & OPT_UNSET)
  53                        *(int *)opt->value = 0;
  54                else
  55                        (*(int *)opt->value)++;
  56                return 0;
  57
  58        case OPTION_STRING:
  59                if (flags & OPT_UNSET) {
  60                        *(const char **)opt->value = (const char *)NULL;
  61                        return 0;
  62                }
  63                if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-')) {
  64                        *(const char **)opt->value = (const char *)opt->defval;
  65                        return 0;
  66                }
  67                if (!arg)
  68                        return opterror(opt, "requires a value", flags);
  69                *(const char **)opt->value = get_arg(p);
  70                return 0;
  71
  72        case OPTION_CALLBACK:
  73                if (flags & OPT_UNSET)
  74                        return (*opt->callback)(opt, NULL, 1);
  75                if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-'))
  76                        return (*opt->callback)(opt, NULL, 0);
  77                if (!arg)
  78                        return opterror(opt, "requires a value", flags);
  79                return (*opt->callback)(opt, get_arg(p), 0);
  80
  81        case OPTION_INTEGER:
  82                if (flags & OPT_UNSET) {
  83                        *(int *)opt->value = 0;
  84                        return 0;
  85                }
  86                if (opt->flags & PARSE_OPT_OPTARG && (!arg || !isdigit(*arg))) {
  87                        *(int *)opt->value = opt->defval;
  88                        return 0;
  89                }
  90                if (!arg)
  91                        return opterror(opt, "requires a value", flags);
  92                *(int *)opt->value = strtol(get_arg(p), (char **)&s, 10);
  93                if (*s)
  94                        return opterror(opt, "expects a numerical value", flags);
  95                return 0;
  96
  97        default:
  98                die("should not happen, someone must be hit on the forehead");
  99        }
 100}
 101
 102static int parse_short_opt(struct optparse_t *p, const struct option *options)
 103{
 104        for (; options->type != OPTION_END; options++) {
 105                if (options->short_name == *p->opt) {
 106                        p->opt = p->opt[1] ? p->opt + 1 : NULL;
 107                        return get_value(p, options, OPT_SHORT);
 108                }
 109        }
 110        return error("unknown switch `%c'", *p->opt);
 111}
 112
 113static int parse_long_opt(struct optparse_t *p, const char *arg,
 114                          const struct option *options)
 115{
 116        for (; options->type != OPTION_END; options++) {
 117                const char *rest;
 118                int flags = 0;
 119
 120                if (!options->long_name)
 121                        continue;
 122
 123                rest = skip_prefix(arg, options->long_name);
 124                if (!rest) {
 125                        if (strncmp(arg, "no-", 3))
 126                                continue;
 127                        flags |= OPT_UNSET;
 128                        rest = skip_prefix(arg + 3, options->long_name);
 129                        if (!rest)
 130                                continue;
 131                }
 132                if (*rest) {
 133                        if (*rest != '=')
 134                                continue;
 135                        p->opt = rest + 1;
 136                }
 137                return get_value(p, options, flags);
 138        }
 139        return error("unknown option `%s'", arg);
 140}
 141
 142int parse_options(int argc, const char **argv, const struct option *options,
 143                  const char * const usagestr[], int flags)
 144{
 145        struct optparse_t args = { argv + 1, argc - 1, NULL };
 146        int j = 0;
 147
 148        for (; args.argc; args.argc--, args.argv++) {
 149                const char *arg = args.argv[0];
 150
 151                if (*arg != '-' || !arg[1]) {
 152                        argv[j++] = args.argv[0];
 153                        continue;
 154                }
 155
 156                if (arg[1] != '-') {
 157                        args.opt = arg + 1;
 158                        do {
 159                                if (*args.opt == 'h')
 160                                        usage_with_options(usagestr, options);
 161                                if (parse_short_opt(&args, options) < 0)
 162                                        usage_with_options(usagestr, options);
 163                        } while (args.opt);
 164                        continue;
 165                }
 166
 167                if (!arg[2]) { /* "--" */
 168                        if (!(flags & PARSE_OPT_KEEP_DASHDASH)) {
 169                                args.argc--;
 170                                args.argv++;
 171                        }
 172                        break;
 173                }
 174
 175                if (!strcmp(arg + 2, "help"))
 176                        usage_with_options(usagestr, options);
 177                if (parse_long_opt(&args, arg + 2, options))
 178                        usage_with_options(usagestr, options);
 179        }
 180
 181        memmove(argv + j, args.argv, args.argc * sizeof(*argv));
 182        argv[j + args.argc] = NULL;
 183        return j + args.argc;
 184}
 185
 186#define USAGE_OPTS_WIDTH 24
 187#define USAGE_GAP         2
 188
 189void usage_with_options(const char * const *usagestr,
 190                        const struct option *opts)
 191{
 192        fprintf(stderr, "usage: %s\n", *usagestr++);
 193        while (*usagestr && **usagestr)
 194                fprintf(stderr, "   or: %s\n", *usagestr++);
 195        while (*usagestr)
 196                fprintf(stderr, "    %s\n", *usagestr++);
 197
 198        if (opts->type != OPTION_GROUP)
 199                fputc('\n', stderr);
 200
 201        for (; opts->type != OPTION_END; opts++) {
 202                size_t pos;
 203                int pad;
 204
 205                if (opts->type == OPTION_GROUP) {
 206                        fputc('\n', stderr);
 207                        if (*opts->help)
 208                                fprintf(stderr, "%s\n", opts->help);
 209                        continue;
 210                }
 211
 212                pos = fprintf(stderr, "    ");
 213                if (opts->short_name)
 214                        pos += fprintf(stderr, "-%c", opts->short_name);
 215                if (opts->long_name && opts->short_name)
 216                        pos += fprintf(stderr, ", ");
 217                if (opts->long_name)
 218                        pos += fprintf(stderr, "--%s", opts->long_name);
 219
 220                switch (opts->type) {
 221                case OPTION_INTEGER:
 222                        if (opts->flags & PARSE_OPT_OPTARG)
 223                                pos += fprintf(stderr, " [<n>]");
 224                        else
 225                                pos += fprintf(stderr, " <n>");
 226                        break;
 227                case OPTION_STRING:
 228                case OPTION_CALLBACK:
 229                        if (opts->argh) {
 230                                if (opts->flags & PARSE_OPT_OPTARG)
 231                                        pos += fprintf(stderr, " [<%s>]", opts->argh);
 232                                else
 233                                        pos += fprintf(stderr, " <%s>", opts->argh);
 234                        } else {
 235                                if (opts->flags & PARSE_OPT_OPTARG)
 236                                        pos += fprintf(stderr, " [...]");
 237                                else
 238                                        pos += fprintf(stderr, " ...");
 239                        }
 240                        break;
 241                default:
 242                        break;
 243                }
 244
 245                if (pos <= USAGE_OPTS_WIDTH)
 246                        pad = USAGE_OPTS_WIDTH - pos;
 247                else {
 248                        fputc('\n', stderr);
 249                        pad = USAGE_OPTS_WIDTH;
 250                }
 251                fprintf(stderr, "%*s%s\n", pad + USAGE_GAP, "", opts->help);
 252        }
 253        fputc('\n', stderr);
 254
 255        exit(129);
 256}