From 7924d311d0262cee9b0eb0391e687a2e5332f05c Mon Sep 17 00:00:00 2001
From: Heikki Hokkanen <hoxu@users.sf.net>
Date: Sat, 10 Jan 2009 11:49:34 +0200
Subject: [PATCH] Started working on a plugin framework.

Added a base class VGPlugin that all plugins should inherit.
---
 inc/plugins.php        | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++
 plugins/hello/main.php | 20 ++++++++++++++++++
 2 files changed, 75 insertions(+)
 create mode 100644 inc/plugins.php
 create mode 100644 plugins/hello/main.php

diff --git a/inc/plugins.php b/inc/plugins.php
new file mode 100644
index 0000000..69f259b
--- /dev/null
+++ b/inc/plugins.php
@@ -0,0 +1,55 @@
+<?php
+
+$plugin_actions = array(); // action -> plugin object
+$plugin_hooks = array();
+
+function call_hooks($type) {
+	global $plugin_hooks;
+	foreach ($plugin_hooks as $type => $classes) {
+		foreach ($classes as $class) {
+			$class->hook($type);
+		}
+	}
+}
+
+/**
+ * Base class plugins should extend. This defines the public, hopefully
+ * somewhat static API plugins should be able to rely on.
+ */
+class VGPlugin
+{
+	function __construct() {
+
+	}
+
+	/**
+	 * Called when a registered action is triggered.
+	 */
+	function action($action) {}
+
+	/**
+	 * Called when a registered hook is triggered.
+	 */
+	function hook($type) {}
+
+	/**
+	 * Can be used to output xhtml.
+	 */
+	function output($xhtml) {
+		echo($xhtml);
+	}
+
+	/**
+	 * Registers the given action for this plugin.
+	 */
+	function register_action($action) {
+		global $plugin_actions;
+		$plugin_actions[$action] = $this;
+	}
+
+	function register_hook($type) {
+		global $plugin_hooks;
+		$plugin_hooks[$type][] = $this;
+	}
+}
+
diff --git a/plugins/hello/main.php b/plugins/hello/main.php
new file mode 100644
index 0000000..621c1f9
--- /dev/null
+++ b/plugins/hello/main.php
@@ -0,0 +1,20 @@
+<?php
+
+class HelloPlugin extends VGPlugin
+{
+	function __construct() {
+		$this->register_action('hello');
+		$this->register_hook('pagenav');
+	}
+
+	function action($action) {
+		$this->output("Hello world!");
+	}
+
+	function hook($type) {
+		if ($type == 'pagenav') {
+			$this->output(" | <a href=\"". makelink(array('a' => 'hello')) ."\">Hello</a> ");
+		}
+	}
+}
+
-- 
2.11.4.GIT