/* $OpenBSD: cmd-generic.c,v 1.5 2009/07/30 13:45:56 nicm Exp $ */

/*
 * Copyright (c) 2008 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

int	cmd_getopt(int, char **, const char *, uint64_t);
int	cmd_flags(int, uint64_t, uint64_t *);
size_t	cmd_print_flags(char *, size_t, size_t, uint64_t);
int	cmd_fill_argument(int, char **, int, char **);

size_t
cmd_prarg(char *buf, size_t len, const char *prefix, char *arg)
{
	if (strchr(arg, ' ') != NULL)
		return (xsnprintf(buf, len, "%s\"%s\"", prefix, arg));
	return (xsnprintf(buf, len, "%s%s", prefix, arg));
}

/* Prepend flags from chflags onto flagstr and call getopt. */
int
cmd_getopt(int argc, char **argv, const char *flagstr, uint64_t chflags)
{
	u_char	ch;
	char	buf[128];
	size_t	len, off;

	*buf = '\0';

	len = sizeof buf;
	off = 0;

	for (ch = 0; ch < 26; ch++) {
		if (chflags & CMD_CHFLAG('a' + ch))
			off += xsnprintf(buf + off, len - off, "%c", 'a' + ch);
		if (chflags & CMD_CHFLAG('A' + ch))
			off += xsnprintf(buf + off, len - off, "%c", 'A' + ch);
	}
	
	strlcat(buf, flagstr, sizeof buf);

	return (getopt(argc, argv, buf));
}

/* 
 * If this option is expected (in ichflags), set it in ochflags, otherwise
 * return -1.
 */
int
cmd_flags(int opt, uint64_t ichflags, uint64_t *ochflags)
{
	u_char	ch;

	for (ch = 0; ch < 26; ch++) {
		if (opt == 'a' + ch && ichflags & CMD_CHFLAG(opt)) {
			(*ochflags) |= CMD_CHFLAG(opt);
			return (0);
		}
		if (opt == 'A' + ch && ichflags & CMD_CHFLAG(opt)) {
			(*ochflags) |= CMD_CHFLAG(opt);
			return (0);
		}
	}
	return (-1);
}

/* Print the flags supported in chflags. */
size_t
cmd_print_flags(char *buf, size_t len, size_t off, uint64_t chflags)
{
	u_char	ch;
	size_t	boff = off;

	if (chflags == 0)
		return (0);
	off += xsnprintf(buf + off, len - off, " -");

	for (ch = 0; ch < 26; ch++) {
		if (chflags & CMD_CHFLAG('a' + ch))
			off += xsnprintf(buf + off, len - off, "%c", 'a' + ch);
		if (chflags & CMD_CHFLAG('A' + ch))
			off += xsnprintf(buf + off, len - off, "%c", 'A' + ch);
	}
	return (off - boff);
}

int
cmd_fill_argument(int flags, char **arg, int argc, char **argv)
{
	*arg = NULL;

	if (flags & CMD_ARG1) {
		if (argc != 1)
			return (-1);
		*arg = xstrdup(argv[0]);
		return (0);
	}

	if (flags & CMD_ARG01) {
		if (argc != 0 && argc != 1)
			return (-1);
		if (argc == 1)
			*arg = xstrdup(argv[0]);
		return (0);
	}

	if (argc != 0)
		return (-1);
	return (0);
}

void
cmd_target_init(struct cmd *self, unused int key)
{
	struct cmd_target_data	*data;

	self->data = data = xmalloc(sizeof *data);
	data->chflags = 0;
	data->target = NULL;
	data->arg = NULL;
}

int
cmd_target_parse(struct cmd *self, int argc, char **argv, char **cause)
{
	struct cmd_target_data	*data;
	const struct cmd_entry	*entry = self->entry;
	int			 opt;

	/* Don't use the entry version since it may be dependent on key. */
	cmd_target_init(self, 0);
	data = self->data;

	while ((opt = cmd_getopt(argc, argv, "t:", entry->chflags)) != -1) {
		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
			continue;
		switch (opt) {
		case 't':
			if (data->target == NULL)
				data->target = xstrdup(optarg);
			break;
		default:
			goto usage;
		}
	}
	argc -= optind;
	argv += optind;

	if (cmd_fill_argument(self->entry->flags, &data->arg, argc, argv) != 0)
		goto usage;
	return (0);

usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

	self->entry->free(self);
	return (-1);
}

void
cmd_target_free(struct cmd *self)
{
	struct cmd_target_data	*data = self->data;

	if (data->target != NULL)
		xfree(data->target);
	if (data->arg != NULL)
		xfree(data->arg);
	xfree(data);
}

size_t
cmd_target_print(struct cmd *self, char *buf, size_t len)
{
	struct cmd_target_data	*data = self->data;
	size_t			 off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
		return (off);
	off += cmd_print_flags(buf, len, off, data->chflags);
	if (off < len && data->target != NULL)
		off += cmd_prarg(buf + off, len - off, " -t ", data->target);
 	if (off < len && data->arg != NULL)
		off += cmd_prarg(buf + off, len - off, " ", data->arg);
	return (off);
}

void
cmd_srcdst_init(struct cmd *self, unused int key)
{
	struct cmd_srcdst_data	*data;

	self->data = data = xmalloc(sizeof *data);
	data->chflags = 0;
	data->src = NULL;
	data->dst = NULL;
	data->arg = NULL;
}

int
cmd_srcdst_parse(struct cmd *self, int argc, char **argv, char **cause)
{
	struct cmd_srcdst_data	*data;
	const struct cmd_entry	*entry = self->entry;
	int			 opt;

	cmd_srcdst_init(self, 0);
	data = self->data;

	while ((opt = cmd_getopt(argc, argv, "s:t:", entry->chflags)) != -1) {
		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
			continue;
		switch (opt) {
		case 's':
			if (data->src == NULL)
				data->src = xstrdup(optarg);
			break;
		case 't':
			if (data->dst == NULL)
				data->dst = xstrdup(optarg);
			break;
		default:
			goto usage;
		}
	}
	argc -= optind;
	argv += optind;

	if (cmd_fill_argument(self->entry->flags, &data->arg, argc, argv) != 0)
		goto usage;
	return (0);

usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

	self->entry->free(self);
	return (-1);
}

void
cmd_srcdst_free(struct cmd *self)
{
	struct cmd_srcdst_data	*data = self->data;

	if (data->src != NULL)
		xfree(data->src);
	if (data->dst != NULL)
		xfree(data->dst);
	if (data->arg != NULL)
		xfree(data->arg);
	xfree(data);
}

size_t
cmd_srcdst_print(struct cmd *self, char *buf, size_t len)
{
	struct cmd_srcdst_data	*data = self->data;
	size_t			 off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
		return (off);
	off += cmd_print_flags(buf, len, off, data->chflags);
	if (off < len && data->src != NULL)
		off += xsnprintf(buf + off, len - off, " -s %s", data->src);
	if (off < len && data->dst != NULL)
		off += xsnprintf(buf + off, len - off, " -t %s", data->dst);
 	if (off < len && data->arg != NULL)
		off += cmd_prarg(buf + off, len - off, " ", data->arg);
	return (off);
}

void
cmd_buffer_init(struct cmd *self, unused int key)
{
	struct cmd_buffer_data	*data;

	self->data = data = xmalloc(sizeof *data);
	data->chflags = 0;
	data->target = NULL;
	data->buffer = -1;
	data->arg = NULL;
}

int
cmd_buffer_parse(struct cmd *self, int argc, char **argv, char **cause)
{
	struct cmd_buffer_data	*data;
	const struct cmd_entry	*entry = self->entry;
	int			 opt, n;
	const char		*errstr;

	cmd_buffer_init(self, 0);
	data = self->data;

	while ((opt = cmd_getopt(argc, argv, "b:t:", entry->chflags)) != -1) {
		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
			continue;
		switch (opt) {
		case 'b':
			if (data->buffer == -1) {
				n = strtonum(optarg, 0, INT_MAX, &errstr);
				if (errstr != NULL) {
					xasprintf(cause, "buffer %s", errstr);
					goto error;
				}
				data->buffer = n;
			}
			break;
		case 't':
			if (data->target == NULL)
				data->target = xstrdup(optarg);
			break;
		default:
			goto usage;
		}
	}
	argc -= optind;
	argv += optind;

	if (cmd_fill_argument(self->entry->flags, &data->arg, argc, argv) != 0)
		goto usage;
	return (0);

usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

error:
	self->entry->free(self);
	return (-1);
}

void
cmd_buffer_free(struct cmd *self)
{
	struct cmd_buffer_data	*data = self->data;

	if (data->target != NULL)
		xfree(data->target);
	if (data->arg != NULL)
		xfree(data->arg);
	xfree(data);
}

size_t
cmd_buffer_print(struct cmd *self, char *buf, size_t len)
{
	struct cmd_buffer_data	*data = self->data;
	size_t			 off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
		return (off);
	off += cmd_print_flags(buf, len, off, data->chflags);
	if (off < len && data->buffer != -1)
		off += xsnprintf(buf + off, len - off, " -b %d", data->buffer);
	if (off < len && data->target != NULL)
		off += cmd_prarg(buf + off, len - off, " -t ", data->target);
 	if (off < len && data->arg != NULL)
		off += cmd_prarg(buf + off, len - off, " ", data->arg);
	return (off);
}

void
cmd_option_init(struct cmd *self, unused int key)
{
	struct cmd_option_data	*data;

	self->data = data = xmalloc(sizeof *data);
	data->chflags = 0;
	data->target = NULL;
	data->option = NULL;
	data->value = NULL;
}

int
cmd_option_parse(struct cmd *self, int argc, char **argv, char **cause)
{
	struct cmd_option_data	*data;
	const struct cmd_entry	*entry = self->entry;
	int			 opt;

	/* Don't use the entry version since it may be dependent on key. */
	cmd_option_init(self, 0);
	data = self->data;

	while ((opt = cmd_getopt(argc, argv, "t:", entry->chflags)) != -1) {
		if (cmd_flags(opt, entry->chflags, &data->chflags) == 0)
			continue;
		switch (opt) {
		case 't':
			if (data->target == NULL)
				data->target = xstrdup(optarg);
			break;
		default:
			goto usage;
		}
	}
	argc -= optind;
	argv += optind;

	if (argc == 2) {
		data->option = xstrdup(argv[0]);
		data->value = xstrdup(argv[1]);
	} else if (argc == 1)
		data->option = xstrdup(argv[0]);
	else
		goto usage;
	return (0);

usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

	self->entry->free(self);
	return (-1);
}

void
cmd_option_free(struct cmd *self)
{
	struct cmd_option_data	*data = self->data;

	if (data->target != NULL)
		xfree(data->target);
	if (data->option != NULL)
		xfree(data->option);
	if (data->value != NULL)
		xfree(data->value);
	xfree(data);
}

size_t
cmd_option_print(struct cmd *self, char *buf, size_t len)
{
	struct cmd_option_data	*data = self->data;
	size_t			 off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
		return (off);
	off += cmd_print_flags(buf, len, off, data->chflags);
	if (off < len && data->target != NULL)
		off += cmd_prarg(buf + off, len - off, " -t ", data->target);
 	if (off < len && data->option != NULL)
		off += xsnprintf(buf + off, len - off, " %s", data->option);
 	if (off < len && data->value != NULL)
		off += xsnprintf(buf + off, len - off, " %s", data->value);
	return (off);
}