parse-options.h 10.1 KB
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#ifndef PARSE_OPTIONS_H
#define PARSE_OPTIONS_H

enum parse_opt_type {
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	/* special types */
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	OPTION_END,
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	OPTION_ARGUMENT,
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	OPTION_GROUP,
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	OPTION_NUMBER,
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	/* options with no arguments */
	OPTION_BIT,
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	OPTION_NEGBIT,
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	OPTION_COUNTUP,
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	OPTION_SET_INT,
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	OPTION_CMDMODE,
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	/* options with arguments (usually) */
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	OPTION_STRING,
	OPTION_INTEGER,
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	OPTION_MAGNITUDE,
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	OPTION_CALLBACK,
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	OPTION_LOWLEVEL_CALLBACK,
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	OPTION_FILENAME
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};

enum parse_opt_flags {
	PARSE_OPT_KEEP_DASHDASH = 1,
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	PARSE_OPT_STOP_AT_NON_OPTION = 2,
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	PARSE_OPT_KEEP_ARGV0 = 4,
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	PARSE_OPT_KEEP_UNKNOWN = 8,
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	PARSE_OPT_NO_INTERNAL_HELP = 16
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};

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enum parse_opt_option_flags {
	PARSE_OPT_OPTARG  = 1,
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	PARSE_OPT_NOARG   = 2,
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	PARSE_OPT_NONEG   = 4,
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	PARSE_OPT_HIDDEN  = 8,
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	PARSE_OPT_LASTARG_DEFAULT = 16,
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	PARSE_OPT_NODASH = 32,
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	PARSE_OPT_LITERAL_ARGHELP = 64,
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	PARSE_OPT_SHELL_EVAL = 256
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};

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

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struct parse_opt_ctx_t;
typedef int parse_opt_ll_cb(struct parse_opt_ctx_t *ctx,
				const struct option *opt, int unset);

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/*
 * `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
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 *   homogeneous across the repository. Should be wrapped by N_() for
 *   translation.
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 *
 * `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.
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 *   Should be wrapped by N_() for translation.
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 *
 * `flags`::
 *   mask of parse_opt_option_flags.
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 *   PARSE_OPT_OPTARG: says that the argument is optional (not for BOOLEANs)
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 *   PARSE_OPT_NOARG: says that this option does not take an argument
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 *   PARSE_OPT_NONEG: says that this option cannot be negated
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 *   PARSE_OPT_HIDDEN: this option is skipped in the default usage, and
 *                     shown only in the full usage.
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 *   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.
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 *   PARSE_OPT_NODASH: this option doesn't start with a dash.
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 *   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.
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 *
 * `callback`::
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 *   pointer to the callback to use for OPTION_CALLBACK or
 *   OPTION_LOWLEVEL_CALLBACK.
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 *
 * `defval`::
 *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
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 *   OPTION_{BIT,SET_INT} store the {mask,integer} to put in the value when met.
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 *   CALLBACKS can use it like they want.
 */
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struct option {
	enum parse_opt_type type;
	int short_name;
	const char *long_name;
	void *value;
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	const char *argh;
	const char *help;
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	int flags;
	parse_opt_cb *callback;
	intptr_t defval;
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};

#define OPT_END()                   { OPTION_END }
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#define OPT_ARGUMENT(l, h)          { OPTION_ARGUMENT, 0, (l), NULL, NULL, \
				      (h), PARSE_OPT_NOARG}
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#define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
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#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) }
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#define OPT_COUNTUP(s, l, v, h)     { OPTION_COUNTUP, (s), (l), (v), NULL, \
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				      (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) }
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#define OPT_BOOL(s, l, v, h)        OPT_SET_INT(s, l, v, h, 1)
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#define OPT_HIDDEN_BOOL(s, l, v, h) { OPTION_SET_INT, (s), (l), (v), NULL, \
				      (h), PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1}
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#define OPT_CMDMODE(s, l, v, h, i)  { OPTION_CMDMODE, (s), (l), (v), NULL, \
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				      (h), PARSE_OPT_NOARG|PARSE_OPT_NONEG, NULL, (i) }
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#define OPT_INTEGER(s, l, v, h)     { OPTION_INTEGER, (s), (l), (v), N_("n"), (h) }
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#define OPT_MAGNITUDE(s, l, v, h)   { OPTION_MAGNITUDE, (s), (l), (v), \
				      N_("n"), (h), PARSE_OPT_NONEG }
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#define OPT_STRING(s, l, v, a, h)   { OPTION_STRING,  (s), (l), (v), (a), (h) }
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#define OPT_STRING_LIST(s, l, v, a, h) \
				    { OPTION_CALLBACK, (s), (l), (v), (a), \
				      (h), 0, &parse_opt_string_list }
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#define OPT_UYN(s, l, v, h)         { OPTION_CALLBACK, (s), (l), (v), NULL, \
				      (h), PARSE_OPT_NOARG, &parse_opt_tertiary }
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#define OPT_DATE(s, l, v, h) \
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	{ OPTION_CALLBACK, (s), (l), (v), N_("time"),(h), 0,	\
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	  parse_opt_approxidate_cb }
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#define OPT_EXPIRY_DATE(s, l, v, h) \
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	{ OPTION_CALLBACK, (s), (l), (v), N_("expiry-date"),(h), 0,	\
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	  parse_opt_expiry_date_cb }
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#define OPT_CALLBACK(s, l, v, a, h, f) \
	{ OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
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#define OPT_NUMBER_CALLBACK(v, h, f) \
	{ OPTION_NUMBER, 0, NULL, (v), NULL, (h), \
	  PARSE_OPT_NOARG | PARSE_OPT_NONEG, (f) }
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#define OPT_FILENAME(s, l, v, h)    { OPTION_FILENAME, (s), (l), (v), \
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				       N_("file"), (h) }
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#define OPT_COLOR_FLAG(s, l, v, h) \
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	{ OPTION_CALLBACK, (s), (l), (v), N_("when"), (h), PARSE_OPT_OPTARG, \
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		parse_opt_color_flag_cb, (intptr_t)"always" }

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

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/* parse_options() will filter out the processed options and leave the
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 * non-option arguments in argv[]. usagestr strings should be marked
 * for translation with N_().
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 * Returns the number of arguments left in argv[].
 */
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extern int parse_options(int argc, const char **argv, const char *prefix,
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                         const struct option *options,
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                         const char * const usagestr[], int flags);

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

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extern int optbug(const struct option *opt, const char *reason);
extern int opterror(const struct option *opt, const char *reason, int flags);
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#if defined(__GNUC__)
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#define opterror(o,r,f) (opterror((o),(r),(f)), const_error())
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#endif

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/*----- incremental advanced APIs -----*/
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enum {
	PARSE_OPT_HELP = -1,
	PARSE_OPT_DONE,
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	PARSE_OPT_NON_OPTION,
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	PARSE_OPT_UNKNOWN
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};

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/*
 * 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.
 */
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struct parse_opt_ctx_t {
	const char **argv;
	const char **out;
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	int argc, cpidx, total;
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	const char *opt;
	int flags;
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	const char *prefix;
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};

extern void parse_options_start(struct parse_opt_ctx_t *ctx,
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				int argc, const char **argv, const char *prefix,
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				const struct option *options, int flags);
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extern int parse_options_step(struct parse_opt_ctx_t *ctx,
			      const struct option *options,
			      const char * const usagestr[]);

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extern int parse_options_end(struct parse_opt_ctx_t *ctx);

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extern struct option *parse_options_concat(struct option *a, struct option *b);
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/*----- some often used options -----*/
extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
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extern int parse_opt_approxidate_cb(const struct option *, const char *, int);
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extern int parse_opt_expiry_date_cb(const struct option *, const char *, int);
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extern int parse_opt_color_flag_cb(const struct option *, const char *, int);
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extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
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extern int parse_opt_object_name(const struct option *, const char *, int);
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extern int parse_opt_commits(const struct option *, const char *, int);
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extern int parse_opt_tertiary(const struct option *, const char *, int);
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extern int parse_opt_string_list(const struct option *, const char *, int);
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extern int parse_opt_noop_cb(const struct option *, const char *, int);
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extern int parse_opt_unknown_cb(const struct option *, const char *, int);
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extern int parse_opt_passthru(const struct option *, const char *, int);
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extern int parse_opt_passthru_argv(const struct option *, const char *, int);
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#define OPT__VERBOSE(var, h)  OPT_COUNTUP('v', "verbose", (var), (h))
#define OPT__QUIET(var, h)    OPT_COUNTUP('q', "quiet",   (var), (h))
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#define OPT__VERBOSITY(var) \
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	{ OPTION_CALLBACK, 'v', "verbose", (var), NULL, N_("be more verbose"), \
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	  PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }, \
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	{ OPTION_CALLBACK, 'q', "quiet", (var), NULL, N_("be more quiet"), \
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	  PARSE_OPT_NOARG, &parse_opt_verbosity_cb, 0 }
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#define OPT__DRY_RUN(var, h)  OPT_BOOL('n', "dry-run", (var), (h))
#define OPT__FORCE(var, h)    OPT_COUNTUP('f', "force",   (var), (h))
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#define OPT__ABBREV(var)  \
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	{ OPTION_CALLBACK, 0, "abbrev", (var), N_("n"),	\
	  N_("use <n> digits to display SHA-1s"),	\
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	  PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
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#define OPT__COLOR(var, h) \
	OPT_COLOR_FLAG(0, "color", (var), (h))
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#define OPT_COLUMN(s, l, v, h) \
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	{ OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }
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#define OPT_PASSTHRU(s, l, v, a, h, f) \
	{ OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru }
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#define OPT_PASSTHRU_ARGV(s, l, v, a, h, f) \
	{ OPTION_CALLBACK, (s), (l), (v), (a), (h), (f), parse_opt_passthru_argv }
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#define _OPT_CONTAINS_OR_WITH(name, variable, help, flag) \
	{ OPTION_CALLBACK, 0, name, (variable), N_("commit"), (help), \
	  PARSE_OPT_LASTARG_DEFAULT | flag, \
	  parse_opt_commits, (intptr_t) "HEAD" \
	}
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#define OPT_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("contains", v, h, PARSE_OPT_NONEG)
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#define OPT_NO_CONTAINS(v, h) _OPT_CONTAINS_OR_WITH("no-contains", v, h, PARSE_OPT_NONEG)
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#define OPT_WITH(v, h) _OPT_CONTAINS_OR_WITH("with", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
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#define OPT_WITHOUT(v, h) _OPT_CONTAINS_OR_WITH("without", v, h, PARSE_OPT_HIDDEN | PARSE_OPT_NONEG)
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#endif