#ifndef PARSE_OPTIONS_H #define PARSE_OPTIONS_H enum parse_opt_type { /* special types */ OPTION_END, OPTION_ARGUMENT, OPTION_GROUP, /* options with no arguments */ OPTION_BIT, OPTION_BOOLEAN, /* _INCR would have been a better name */ OPTION_SET_INT, OPTION_SET_PTR, /* options with arguments (usually) */ OPTION_STRING, OPTION_INTEGER, OPTION_CALLBACK, }; enum parse_opt_flags { PARSE_OPT_KEEP_DASHDASH = 1, PARSE_OPT_STOP_AT_NON_OPTION = 2, PARSE_OPT_KEEP_ARGV0 = 4, PARSE_OPT_KEEP_UNKNOWN = 8, PARSE_OPT_NO_INTERNAL_HELP = 16, }; enum parse_opt_option_flags { PARSE_OPT_OPTARG = 1, PARSE_OPT_NOARG = 2, PARSE_OPT_NONEG = 4, PARSE_OPT_HIDDEN = 8, PARSE_OPT_LASTARG_DEFAULT = 16, }; struct option; typedef int parse_opt_cb(const struct option *, const char *arg, int unset); /* * `type`:: * holds the type of the option, you must have an OPTION_END last in your * array. * * `short_name`:: * the character to use as a short option name, '\0' if none. * * `long_name`:: * the long option name, without the leading dashes, NULL if none. * * `value`:: * stores pointers to the values to be filled. * * `argh`:: * token to explain the kind of argument this option wants. Keep it * homogeneous across the repository. * * `help`:: * the short help associated to what the option does. * Must never be NULL (except for OPTION_END). * OPTION_GROUP uses this pointer to store the group header. * * `flags`:: * mask of parse_opt_option_flags. * PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs) * PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs * PARSE_OPT_NONEG: says that this option cannot be negated * PARSE_OPT_HIDDEN this option is skipped in the default usage, showed in * the long one. * * `callback`:: * pointer to the callback to use for OPTION_CALLBACK. * * `defval`:: * default value to fill (*->value) with for PARSE_OPT_OPTARG. * OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in * the value when met. * CALLBACKS can use it like they want. */ struct option { enum parse_opt_type type; int short_name; const char *long_name; void *value; const char *argh; const char *help; int flags; parse_opt_cb *callback; intptr_t defval; }; #define OPT_END() { OPTION_END } #define OPT_ARGUMENT(l, h) { OPTION_ARGUMENT, 0, (l), NULL, NULL, (h) } #define OPT_GROUP(h) { OPTION_GROUP, 0, NULL, NULL, NULL, (h) } #define OPT_BIT(s, l, v, h, b) { OPTION_BIT, (s), (l), (v), NULL, (h), 0, NULL, (b) } #define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) } #define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, (h), 0, NULL, (i) } #define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, (h), 0, NULL, (p) } #define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), NULL, (h) } #define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) } #define OPT_DATE(s, l, v, h) \ { OPTION_CALLBACK, (s), (l), (v), "time",(h), 0, \ parse_opt_approxidate_cb } #define OPT_CALLBACK(s, l, v, a, h, f) \ { OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) } /* parse_options() will filter out the processed options and leave the * non-option arguments in argv[]. * Returns the number of arguments left in argv[]. */ extern int parse_options(int argc, const char **argv, const struct option *options, const char * const usagestr[], int flags); extern NORETURN void usage_with_options(const char * const *usagestr, const struct option *options); /*----- incremental advanced APIs -----*/ enum { PARSE_OPT_HELP = -1, PARSE_OPT_DONE, PARSE_OPT_UNKNOWN, }; /* * It's okay for the caller to consume argv/argc in the usual way. * Other fields of that structure are private to parse-options and should not * be modified in any way. */ struct parse_opt_ctx_t { const char **argv; const char **out; int argc, cpidx; const char *opt; int flags; }; extern int parse_options_usage(const char * const *usagestr, const struct option *opts); extern void parse_options_start(struct parse_opt_ctx_t *ctx, int argc, const char **argv, int flags); extern int parse_options_step(struct parse_opt_ctx_t *ctx, const struct option *options, const char * const usagestr[]); extern int parse_options_end(struct parse_opt_ctx_t *ctx); /*----- some often used options -----*/ extern int parse_opt_abbrev_cb(const struct option *, const char *, int); extern int parse_opt_approxidate_cb(const struct option *, const char *, int); extern int parse_opt_verbosity_cb(const struct option *, const char *, int); extern int parse_opt_with_commit(const struct option *, const char *, int); #define OPT__VERBOSE(var) OPT_BOOLEAN('v', "verbose", (var), "be verbose") #define OPT__QUIET(var) OPT_BOOLEAN('q', "quiet", (var), "be quiet") #define OPT__VERBOSITY(var) \ { OPTION_CALLBACK, 'v', "verbose", (var), NULL, "be more verbose", \ PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \ { OPTION_CALLBACK, 'q', "quiet", (var), NULL, "be more quiet", \ PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 } #define OPT__DRY_RUN(var) OPT_BOOLEAN('n', "dry-run", (var), "dry run") #define OPT__ABBREV(var) \ { OPTION_CALLBACK, 0, "abbrev", (var), "n", \ "use <n> digits to display SHA-1s", \ PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 } extern const char *parse_options_fix_filename(const char *prefix, const char *file); #endif