squirrelmail/functions/plugin.php

<?php

   /**
    *   plugin.php
    *
    *   Copyright (c) 1999-2001 The Squirrelmail Development Team
    *   Licensed under the GNU GPL. For full terms see the file COPYING.
    *
    *   This file provides the framework for a plugin architecture.
    *
    *   Documentation on how to write plugins might show up some time.
    *
    *   $Id$
    */

    global $squirrelmail_plugin_hooks;

    $squirrelmail_plugin_hooks = array();

    // This function adds a plugin
    function use_plugin ($name) {

        if (file_exists('../plugins/'.$name.'/setup.php')) {
            include_once('../plugins/'.$name.'/setup.php');
            $function = 'squirrelmail_plugin_init_'.$name;
            if (function_exists($function)) {
                $function();
            }
        }

    }

    // This function executes a hook
    function do_hook ($name) {
        global $squirrelmail_plugin_hooks;
        $Data = func_get_args();
        if (isset($squirrelmail_plugin_hooks[$name]) &&
            is_array($squirrelmail_plugin_hooks[$name])) {
            foreach ($squirrelmail_plugin_hooks[$name] as $function) {
                // Add something to set correct gettext domain for plugin
                if (function_exists($function)) {
                    $function($Data);
                }
            }
        }

        // Variable-length argument lists have a slight problem when
        // passing values by reference.  Pity.  This is a workaround.
        return $Data;
    }

    /* -------------------- MAIN --------------------- */

    // On startup, register all plugins configured for use
    if (isset($plugins) && is_array($plugins)) {
        foreach ($plugins as $name) {
            use_plugin($name);
        }
    }

?>