/* $OpenBSD: options.c,v 1.20 2016/10/10 21:29:23 nicm Exp $ */

/*
 * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * 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 <stdarg.h>
#include <stdlib.h>
#include <string.h>

#include "tmux.h"

/*
 * Option handling; each option has a name, type and value and is stored in
 * a red-black tree.
 */

struct options {
	RB_HEAD(options_tree, options_entry) tree;
	struct options	*parent;
};

static int	options_cmp(struct options_entry *, struct options_entry *);
RB_GENERATE_STATIC(options_tree, options_entry, entry, options_cmp);

static void	options_free1(struct options *, struct options_entry *);

static int
options_cmp(struct options_entry *o1, struct options_entry *o2)
{
	return (strcmp(o1->name, o2->name));
}

struct options *
options_create(struct options *parent)
{
	struct options	*oo;

	oo = xcalloc(1, sizeof *oo);
	RB_INIT(&oo->tree);
	oo->parent = parent;
	return (oo);
}

static void
options_free1(struct options *oo, struct options_entry *o)
{
	RB_REMOVE(options_tree, &oo->tree, o);
	free((char *)o->name);
	if (o->type == OPTIONS_STRING)
		free(o->str);
	free(o);
}

void
options_free(struct options *oo)
{
	struct options_entry	*o, *o1;

	RB_FOREACH_SAFE (o, options_tree, &oo->tree, o1)
		options_free1(oo, o);
	free(oo);
}

struct options_entry *
options_first(struct options *oo)
{
	return (RB_MIN(options_tree, &oo->tree));
}

struct options_entry *
options_next(struct options_entry *o)
{
	return (RB_NEXT(options_tree, &oo->tree, o));
}

struct options_entry *
options_find1(struct options *oo, const char *name)
{
	struct options_entry	p;

	p.name = (char *)name;
	return (RB_FIND(options_tree, &oo->tree, &p));
}

struct options_entry *
options_find(struct options *oo, const char *name)
{
	struct options_entry	*o, p;

	p.name = (char *)name;
	o = RB_FIND(options_tree, &oo->tree, &p);
	while (o == NULL) {
		oo = oo->parent;
		if (oo == NULL)
			break;
		o = RB_FIND(options_tree, &oo->tree, &p);
	}
	return (o);
}

void
options_remove(struct options *oo, const char *name)
{
	struct options_entry	*o;

	if ((o = options_find1(oo, name)) != NULL)
		options_free1(oo, o);
}

struct options_entry *
options_set_string(struct options *oo, const char *name, const char *fmt, ...)
{
	struct options_entry	*o;
	va_list			 ap;
	char			*s;

	s = NULL;
	if ((o = options_find1(oo, name)) == NULL) {
		o = xmalloc(sizeof *o);
		o->name = xstrdup(name);
		RB_INSERT(options_tree, &oo->tree, o);
		memcpy(&o->style, &grid_default_cell, sizeof o->style);
	} else if (o->type == OPTIONS_STRING)
		s = o->str;

	va_start(ap, fmt);
	o->type = OPTIONS_STRING;
	xvasprintf(&o->str, fmt, ap);
	va_end(ap);

	free(s);
	return (o);
}

char *
options_get_string(struct options *oo, const char *name)
{
	struct options_entry	*o;

	if ((o = options_find(oo, name)) == NULL)
		fatalx("missing option %s", name);
	if (o->type != OPTIONS_STRING)
		fatalx("option %s not a string", name);
	return (o->str);
}

struct options_entry *
options_set_number(struct options *oo, const char *name, long long value)
{
	struct options_entry	*o;

	if ((o = options_find1(oo, name)) == NULL) {
		o = xmalloc(sizeof *o);
		o->name = xstrdup(name);
		RB_INSERT(options_tree, &oo->tree, o);
		memcpy(&o->style, &grid_default_cell, sizeof o->style);
	} else if (o->type == OPTIONS_STRING)
		free(o->str);

	o->type = OPTIONS_NUMBER;
	o->num = value;
	return (o);
}

long long
options_get_number(struct options *oo, const char *name)
{
	struct options_entry	*o;

	if ((o = options_find(oo, name)) == NULL)
		fatalx("missing option %s", name);
	if (o->type != OPTIONS_NUMBER)
		fatalx("option %s not a number", name);
	return (o->num);
}

struct options_entry *
options_set_style(struct options *oo, const char *name, const char *value,
    int append)
{
	struct options_entry	*o;
	struct grid_cell	 tmpgc;

	o = options_find1(oo, name);
	if (o == NULL || !append)
		memcpy(&tmpgc, &grid_default_cell, sizeof tmpgc);
	else
		memcpy(&tmpgc, &o->style, sizeof tmpgc);

	if (style_parse(&grid_default_cell, &tmpgc, value) == -1)
		return (NULL);

	if (o == NULL) {
		o = xmalloc(sizeof *o);
		o->name = xstrdup(name);
		RB_INSERT(options_tree, &oo->tree, o);
	} else if (o->type == OPTIONS_STRING)
		free(o->str);

	o->type = OPTIONS_STYLE;
	memcpy(&o->style, &tmpgc, sizeof o->style);
	return (o);
}

struct grid_cell *
options_get_style(struct options *oo, const char *name)
{
	struct options_entry	*o;

	if ((o = options_find(oo, name)) == NULL)
		fatalx("missing option %s", name);
	if (o->type != OPTIONS_STYLE)
		fatalx("option %s not a style", name);
	return (&o->style);
}