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#ifndef PARSE_OPTIONS_H
#define PARSE_OPTIONS_H

enum parse_opt_type {
/* special types */
OPTION_END,
OPTION_ARGUMENT,
OPTION_GROUP,
OPTION_NUMBER,
/* options with no arguments */
OPTION_BIT,
OPTION_NEGBIT,
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,
OPTION_FILENAME
};

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,
PARSE_OPT_NODASH = 32,
PARSE_OPT_LITERAL_ARGHELP = 64,
PARSE_OPT_NEGHELP = 128,
};

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
* PARSE_OPT_NONEG: says that this option cannot be negated
* PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
* shown only in the full usage.
* PARSE_OPT_LASTARG_DEFAULT: says that this option will take the default
* value if no argument is given when the option
* is last on the command line. If the option is
* not last it will require an argument.
* Should not be used with PARSE_OPT_OPTARG.
* PARSE_OPT_NODASH: this option doesn't start with a dash.
* PARSE_OPT_LITERAL_ARGHELP: says that argh shouldn't be enclosed in brackets
* (i.e. '<argh>') in the help message.
* Useful for options with multiple parameters.
* PARSE_OPT_NEGHELP: says that the long option should always be shown with
* the --no prefix in the usage message. Sometimes
* useful for users of OPTION_NEGBIT.
*
* `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), PARSE_OPT_NOARG}
#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), \
PARSE_OPT_NOARG, NULL, (b) }
#define OPT_NEGBIT(s, l, v, h, b) { OPTION_NEGBIT, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG, NULL, (b) }
#define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG }
#define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG, NULL, (i) }
#define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG, NULL, (p) }
#define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), "n", (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) }
#define OPT_NUMBER_CALLBACK(v, h, f) \
{ OPTION_NUMBER, 0, NULL, (v), NULL, (h), \
PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) }
#define OPT_FILENAME(s, l, v, h) { OPTION_FILENAME, (s), (l), (v), \
"FILE", (h) }

/* 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 char *prefix,
                         const struct option *options,
                         const char * const usagestr[], int flags);

extern NORETURN void usage_with_options(const char * const *usagestr,
                                        const struct option *options);

extern NORETURN void usage_msg_opt(const char *msg,
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;
const char *prefix;
};

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, const char *prefix,
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 }

#endif
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