plugins.php

<?php

	/**
	 * Action and Filter Plugins for Xerte by John Smith @ Glasgow Caledonian University
	 *
	 * First define some constants that we need
	 */
	define('D_S', DIRECTORY_SEPARATOR);
	define('PLUGINS_PATH', dirname(__FILE__) . D_S . 'plugins');


	/**
	 * We will be absorbing the Wordpress plugins.php code
	 * Wordpress 'plugins.php' has been renamed 'wp_plugins.php' to identify Wordpress codebase
	 */
	require_once(dirname(__FILE__) . D_S . 'website_code' . D_S . 'php' . D_S . 'wp_plugins.php');


	/**
	 * Traverse the /plugins folder, if available and include any plugins that are found
	 * Handles both single file plugins and also folder style plugins containing js/css/images etc
	 */
	if ($dir = opendir(PLUGINS_PATH)) {

		while (false !== ($filename = readdir($dir)) && $dir) {

			if ($filename != "." && $filename != "..") {

				if (is_dir(PLUGINS_PATH . D_S . $filename)) {

					$plugin_file = PLUGINS_PATH . D_S . $filename . D_S . $filename . ".php";

					if (file_exists($plugin_file)) {

						require_once($plugin_file);
					}
				}
				else {

					$plugin_file = PLUGINS_PATH . D_S . $filename;

					if (file_exists($plugin_file) && pathinfo($plugin_file, PATHINFO_EXTENSION) == 'php') {

						require_once($plugin_file);

					}
				}
			}
		}

		closedir($dir);
	}


	/**
	 * After the plugins are all loaded, let's trigger an action, just in case we can use it later
	 */
	do_action("plugins_loaded");


	/**
	 * This function returns the name of the main script minus the .php extension in
	 * order to help identify the current page
	 *
	 * @return array Filename of current script without .php and logged in status
	 */
	function plugins_get_context() {

		global $authmech;
		if (!$authmech) $authmech = Xerte_Authentication_Factory::create($xerte_toolkits_site->authentication_method);
		$basename = basename($_SERVER['SCRIPT_NAME'], '.php');
		$logged_in = !$authmech->needsLogin();
		return array($basename, $logged_in);

	}


	/**
	 * This function returns true if we're on initial login page
	 */
	function is_login_page() {

		$context = plugins_get_context();
		//print_r($context);
		return ($context[0] == "index" && !$context[1]);

	}


	/**
	 * This function returns true if we're on editor page
	 */
	function is_editor_page() {

		$context = plugins_get_context();
		return ($context[0] == "index" && $context[1]);

	}


	/**
	 * Helper functions to trigger the appropriate action
	 *
	 * @return void
	 */
	function head_start() { do_action("head_start"); }

	function head_end() { do_action("head_end"); }

	function body_start() { do_action("body_start"); }

	function body_end() { do_action("body_end"); }

	function startup() { do_action("startup"); }

	function shutdown() { do_action("shutdown"); }