/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef __BTRFS_HELP_H__
#define __BTRFS_HELP_H__

#include <limits.h>
#include <stdbool.h>

struct cmd_struct;
struct cmd_group;

/* User defined long options first option */
#define GETOPT_VAL_FIRST			256

#define GETOPT_VAL_SI				512
#define GETOPT_VAL_IEC				513
#define GETOPT_VAL_RAW				514
#define GETOPT_VAL_HUMAN_READABLE		515
#define GETOPT_VAL_KBYTES			516
#define GETOPT_VAL_MBYTES			517
#define GETOPT_VAL_GBYTES			518
#define GETOPT_VAL_TBYTES			519

#define GETOPT_VAL_HELP				520
#define GETOPT_VAL_PARAM			521
#define GETOPT_VAL_DRY_RUN			522

#define ARGV0_BUF_SIZE	PATH_MAX

#define HELPINFO_UNITS_LONG						\
	OPTLINE("--raw", "raw numbers in bytes"),			\
	OPTLINE("--human-readable", "human friendly numbers, base 1024 (default)"), \
	OPTLINE("--iec", "use 1024 as a base (KiB, MiB, GiB, TiB)"),	\
	OPTLINE("--si", "use 1000 as a base (kB, MB, GB, TB)"),		\
	OPTLINE("--kbytes", "show sizes in KiB, or kB with --si"),	\
	OPTLINE("--mbytes", "show sizes in MiB, or MB with --si"),	\
	OPTLINE("--gbytes", "show sizes in GiB, or GB with --si"),	\
	OPTLINE("--tbytes", "show sizes in TiB, or TB with --si")

#define HELPINFO_UNITS_SHORT_LONG					\
	OPTLINE("-b|--raw", "raw numbers in bytes"),			\
	OPTLINE("-h|--human-readable", "human friendly numbers, base 1024 (default)"), \
	OPTLINE("-H", "human friendly numbers, base 1000"),		\
	OPTLINE("--iec", "use 1024 as a base (KiB, MiB, GiB, TiB)"),	\
	OPTLINE("--si", "use 1000 as a base (kB, MB, GB, TB)"),		\
	OPTLINE("-k|--kbytes", "show sizes in KiB, or kB with --si"),	\
	OPTLINE("-m|--mbytes", "show sizes in MiB, or MB with --si"),	\
	OPTLINE("-g|--gbytes", "show sizes in GiB, or GB with --si"),	\
	OPTLINE("-t|--tbytes", "show sizes in TiB, or TB with --si")

#define HELPINFO_OPTION			"\x01"
#define HELPINFO_DESC			"\x02"
/* Keep the line length below 100 chars. */
#define HELPINFO_PREFIX_WIDTH		4
#define HELPINFO_LISTING_WIDTH		8
#define HELPINFO_OPTION_WIDTH		24
#define HELPINFO_OPTION_MARGIN		2
#define HELPINFO_DESC_PREFIX		(HELPINFO_PREFIX_WIDTH +	\
					 HELPINFO_OPTION_WIDTH +	\
					 HELPINFO_OPTION_MARGIN)
#define HELPINFO_DESC_WIDTH		99 - HELPINFO_DESC_PREFIX
#define OPTLINE(opt, text)		HELPINFO_OPTION opt HELPINFO_DESC text

/*
 * Special marker in the help strings that will preemptively insert the global
 * options and then continue with the following text that possibly follows
 * after the regular options
 */
#define HELPINFO_INSERT_GLOBALS		"",					\
					"Global options:"

#define HELPINFO_INSERT_FORMAT		"--format TYPE"
#define HELPINFO_INSERT_DRY_RUN OPTLINE("--dry-run", "do not do any active/changing actions")
#define HELPINFO_INSERT_VERBOSE	OPTLINE("-v|--verbose", "increase output verbosity")
#define HELPINFO_INSERT_QUIET	OPTLINE("-q|--quiet", "print only errors")

/*
 * Descriptor of output format
 */
struct format_desc {
	unsigned int value;
	char name[8];
};

extern const struct format_desc output_formats[2];

const char *output_format_name(unsigned int value);

__attribute__((noreturn))
void usage_unknown_option(const struct cmd_struct *cmd, char **argv);

__attribute__((noreturn))
void usage(const struct cmd_struct *cmd, int error);
void usage_command(const struct cmd_struct *cmd, bool full, bool err);
void usage_command_group(const struct cmd_group *grp, bool all, bool err);
void usage_command_group_short(const struct cmd_group *grp);

__attribute__((noreturn))
void help_unknown_token(const char *arg, const struct cmd_group *grp);
__attribute__((noreturn))
void help_ambiguous_token(const char *arg, const struct cmd_group *grp);

void help_command_group(const struct cmd_group *grp, int argc, char **argv);

int check_argc_exact(int nargs, int expected);
int check_argc_min(int nargs, int expected);
int check_argc_max(int nargs, int expected);
void clean_args_no_options(const struct cmd_struct *cmd,
			   int argc, char *argv[]);
void clean_args_no_options_relaxed(const struct cmd_struct *cmd,
				   int argc, char *argv[]);

void fixup_argv0(char **argv, const char *token);
void set_argv0(char **argv);
const char *get_argv0_buf(void);

#endif
