<?php
###############################################################################
# Gregarius - A PHP based RSS aggregator.
# Copyright (C) 2003 - 2005 Marco Bonetti
#
###############################################################################
# This program is free software and open source 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 of the License,
# or (at your option) any later version.
#
# 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  02111-1307  USA  or visit
# http://www.gnu.org/licenses/gpl.html
#
###############################################################################
# E-mail:      mbonetti at users dot sourceforge dot net
# Web page:    http://sourceforge.net/projects/gregarius
#
###############################################################################

require_once('init.php');

/**
 * (private) 
 * Returns a reference to the hooks array, which holds
 * references of installed plugin's callback functions
 */
function & __getHooksArray() {
	static $__rss_hooks;
	if ($__rss_hooks == null) {
		$__rss_hooks = array();
	}
	return ($__rss_hooks);
}

/**
 * Allows a plugin to register itself for the 
 * given hook
 */
function rss_set_hook($hook,$fnct) {
	 $hooks =& __getHooksArray();
	 if (array_key_exists($hook, $hooks)) {
		  $hooks[$hook][] = $fnct;
	 } else {
		  $hooks[$hook]=array($fnct);
	 }
}

/**
 * Performs callbacks for the given hook,
 * based on the plugins registered functions
 */
function rss_plugin_hook($hook, $data) {
	$hooks =& __getHooksArray();
	if (array_key_exists($hook, $hooks)) {
		  foreach($hooks[$hook] as $fnct) {
				if (function_exists($fnct)) {
				     _pf("calling plugin func for $hook ...");
					 $data = call_user_func($fnct,$data);
					 _pf("done");
				}
		  }
	 }
	 return $data;
}


/**
 * loads the active plugins from the config, instantiates
 * them
 */
foreach(getConfig('rss.config.plugins') as $pf) {
	if (defined('RSS_FILE_LOCATION')) {
		$prefix = "../";
	} else {
		$prefix = "";
	}
  if (file_exists($prefix . RSS_PLUGINS_DIR.'/'.$pf)) {
		require_once($prefix . RSS_PLUGINS_DIR."/$pf");
  } 
}

/*
 * autoload plugins specific to a theme without the
 * need to add them to config
 * all plugins def must be inside a unique file called plugins.php that
 * do all the works
 */
	$mytheme = defined('THEME_OVERRIDE')?constant("THEME_OVERRIDE"):getConfig('rss.output.theme');
/*
 * If theme is set in the request then let it overide everything. 
 * Then it can have a plugins.php page. 
 */
	if (isset($_REQUEST['theme'])) {
		    $mytheme = preg_replace('/[^a-zA-Z0-9_]/','',$_REQUEST['theme']);
	}
	$mythemeplugin=RSS_THEME_DIR."/$mytheme/plugins.php";
	if (file_exists($mythemeplugin)) require_once($mythemeplugin);

?>