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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_COUNTUP,
OPTION_SET_INT,
OPTION_SET_PTR,
/* options with arguments (usually) */
OPTION_STRING,
OPTION_INTEGER,
OPTION_CALLBACK,
OPTION_LOWLEVEL_CALLBACK,
OPTION_FILENAME
};

/* Deprecated synonym */
#define OPTION_BOOLEAN OPTION_COUNTUP

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_SHELL_EVAL = 256
};

struct option;
typedef int parse_opt_cb(const struct option *, const char *arg, int unset);

struct parse_opt_ctx_t;
typedef int parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
const struct option *opt, 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. Should be wrapped by N_() for
* translation.
*
* `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.
* Should be wrapped by N_() for translation.
*
* `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 does not take an 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.
*
* `callback`::
* pointer to the callback to use for OPTION_CALLBACK or
* OPTION_LOWLEVEL_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_COUNTUP(s, l, v, h) { OPTION_COUNTUP, (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_BOOL(s, l, v, h) OPT_SET_INT(s, l, v, h, 1)
#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_("n"), (h) }
#define OPT_STRING(s, l, v, a, h) { OPTION_STRING, (s), (l), (v), (a), (h) }
#define OPT_STRING_LIST(s, l, v, a, h) \
{ OPTION_CALLBACK, (s), (l), (v), (a), \
(h), 0, &parse_opt_string_list }
#define OPT_UYN(s, l, v, h) { OPTION_CALLBACK, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG, &parse_opt_tertiary }
#define OPT_DATE(s, l, v, h) \
{ OPTION_CALLBACK, (s), (l), (v), N_("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), \
N_("file"), (h) }
#define OPT_COLOR_FLAG(s, l, v, h) \
{ OPTION_CALLBACK, (s), (l), (v), N_("when"), (h), PARSE_OPT_OPTARG, \
parse_opt_color_flag_cb, (intptr_t)"always" }

#define OPT_NOOP_NOARG(s, l) \
{ OPTION_CALLBACK, (s), (l), NULL, NULL, \
N_("no-op (backward compatibility)"), \
PARSE_OPT_HIDDEN | PARSE_OPT_NOARG, parse_opt_noop_cb }

/* Deprecated synonym */
#define OPT_BOOLEAN OPT_COUNTUP

/* parse_options() will filter out the processed options and leave the
* non-option arguments in argv[]. usagestr strings should be marked
* for translation with N_().
* 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);

extern int optbug(const struct option *opt, const char *reason);
extern int opterror(const struct option *opt, const char *reason, int flags);
/*----- incremental advanced APIs -----*/

enum {
PARSE_OPT_HELP = -1,
PARSE_OPT_DONE,
PARSE_OPT_NON_OPTION,
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 void parse_options_start(struct parse_opt_ctx_t *ctx,
int argc, const char **argv, const char *prefix,
const struct option *options, 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);

extern int parse_options_concat(struct option *dst, size_t, struct option *src);

/*----- 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_color_flag_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);
extern int parse_opt_tertiary(const struct option *, const char *, int);
extern int parse_opt_string_list(const struct option *, const char *, int);
extern int parse_opt_noop_cb(const struct option *, const char *, int);

#define OPT__VERBOSE(var, h) OPT_BOOLEAN('v', "verbose", (var), (h))
#define OPT__QUIET(var, h) OPT_BOOLEAN('q', "quiet", (var), (h))
#define OPT__VERBOSITY(var) \
{ OPTION_CALLBACK, 'v', "verbose", (var), NULL, N_("be more verbose"), \
PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
{ OPTION_CALLBACK, 'q', "quiet", (var), NULL, N_("be more quiet"), \
PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
#define OPT__DRY_RUN(var, h) OPT_BOOLEAN('n', "dry-run", (var), (h))
#define OPT__FORCE(var, h) OPT_BOOLEAN('f', "force", (var), (h))
#define OPT__ABBREV(var) \
{ OPTION_CALLBACK, 0, "abbrev", (var), N_("n"), \
N_("use <n> digits to display SHA-1s"), \
PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
#define OPT__COLOR(var, h) \
OPT_COLOR_FLAG(0, "color", (var), (h))
#define OPT_COLUMN(s, l, v, h) \
{ OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }

#endif
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