/* Copyright (C) 2009 Luke Shumaker
   
   This file is part of rvs.
   
   rvs is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your
   option) any later version.
   
   rvs 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 rvs; see the file COPYING.
   If not, write to the Free Software Foundation,
   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef FILE_plugin_h_SEEN
#define FILE_plugin_h_SEEN

#include "rvs.h"

/* a plugin */
/* a generic binary tree emulating a n-ary tree via linked list */
struct plugin
{
	char *name;
	struct plugin_command *commands;/* left  leaf */
	struct plugin         *next;    /* right leaf */
};

/* a single plugin command */
struct plugin_command
{
	/* node */
	char *name;
	struct plugin         *plugin; /* which plugin does it belong to? */
	struct plugin_command *depend; /* what does this depend on? */
	char                  *depends;/* what does this depend on? (string) */
	
	/* linked list */
	struct plugin_command *next;
};

/* create a blank plugin_command */
struct plugin_command *
mkcommand()
{
	struct plugin_command *command;
	command=(struct plugin_command *)xmalloc(sizeof(*command));
	
	/* node */
	command->name=NULL;
	command->plugin=NULL;
	command->depend=NULL;
	command->depends=NULL;
	
	/* linked list */
	command->next=NULL;
	
	return command;
}


struct plugin *
plugin_find_plugin(struct plugin *node, char *name)
{
	
	if (node==NULL)
		return node;
	else {
		if (strcmp(node->name,name) == 0)
			return node;
		else
			return plugin_find_plugin(node->next,name);
	}
}

struct plugin_command *
plugin_find_plugin_command(struct plugin_command *node, char *name)
{
	if (node==NULL)
		return node;
	else {
		if (strcmp(node->name,name) == 0)
			return node;
		else
			return plugin_find_plugin_command(node->next,name);
	}
}

/* returns the first command with `name' it finds
   Perhaps it should return a linked list of all commands with `name'?
   This would require a dedicated struct for the function.
   That makes me kind of want to move it to another file.             */
struct plugin_command *
plugin_find_command(struct plugin *plugin, char *name)
{
	struct plugin_command *ret;
	ret=plugin_find_plugin_command(plugin->commands,name);
	if (ret == NULL)
		ret=plugin_find_command(plugin->next,name);
	return ret;
}

void
plugin_free_command(struct plugin_command *command)
{
	if (command!=NULL) {
		#ifdef DEBUG
			printf("    + %s\n",command->name);
		#endif
		xfree(command->name);
		xfree(command->depends);
		xfree(command);
		plugin_free_command(command->next);
	}
}

void
plugin_free_plugin(struct plugin *plugin)
{
	if (plugin!=NULL) {
		#ifdef DEBUG
			printf(" - %s\n",plugin->name);
		#endif
		xfree(plugin->name);
		plugin_free_command(plugin->commands);
		plugin_free_plugin(plugin->next);
	}
}

#endif