/*
 * 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.
 */

#define ARGV0_BUF_SIZE	64

struct cmd_struct {
	const char *token;
	int (*fn)(int, char **);

	/*
	 * Usage strings
	 *
	 * A NULL-terminated array of the following format:
	 *
	 *   usagestr[0] - one-line synopsis (required)
	 *   usagestr[1] - one-line short description (required)
	 *   usagestr[2..m] - a long (possibly multi-line) description
	 *                    (optional)
	 *   usagestr[m + 1] - an empty line separator (required if at least one
	 *                     option string is given, not needed otherwise)
	 *   usagestr[m + 2..n] - option strings, one option per line
	 *                        (optional)
	 *   usagestr[n + 1] - NULL terminator
	 *
	 * Options (if present) should always (even if there is no long
	 * description) be prepended with an empty line.  Supplied strings are
	 * indented but otherwise printed as-is, no automatic wrapping is done.
	 *
	 * Grep for cmd_*_usage[] for examples.
	 */
	const char * const *usagestr;

	/* should be NULL if token is not a subgroup */
	const struct cmd_group *next;

	/* if true don't list this token in help listings */
	int hidden;
};

struct cmd_group {
	const char *usagestr;
	const char *infostr;

	const struct cmd_struct commands[];
};

/* btrfs.c */
int prefixcmp(const char *str, const char *prefix);

int check_argc_exact(int nargs, int expected);
int check_argc_min(int nargs, int expected);
int check_argc_max(int nargs, int expected);

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

/* help.c */
extern const char * const generic_cmd_help_usage[];

void usage(const char * const *usagestr);
void usage_command(const struct cmd_struct *cmd, int full, int err);
void usage_command_group(const struct cmd_group *grp, int all, int err);

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