add LaTex Plugin

LaTex/Plugin.php

@@ -0,0 +1,64 @@
+<?php
+/**
+ * LaTex 公式解析
+ * 
+ * @package LaTex
+ * @author mutoo
+ * @version 1.0.0
+ * @link http://blog.mutoo.im/LaTex.html
+ */
+class LaTex_Plugin implements Typecho_Plugin_Interface
+{
+    /**
+     * 激活插件方法,如果激活失败,直接抛出异常
+     * 
+     * @access public
+     * @return void
+     * @throws Typecho_Plugin_Exception
+     */
+    public static function activate()
+    {
+        Typecho_Plugin::factory('Widget_Archive')->footer = array('LaTex_Plugin', 'footer');
+    }
+    
+    /**
+     * 禁用插件方法,如果禁用失败,直接抛出异常
+     * 
+     * @static
+     * @access public
+     * @return void
+     * @throws Typecho_Plugin_Exception
+     */
+    public static function deactivate()
+    {}
+    
+    /**
+     * 获取插件配置面板
+     * 
+     * @access public
+     * @param Typecho_Widget_Helper_Form $form 配置面板
+     * @return void
+     */
+    public static function config(Typecho_Widget_Helper_Form $form){}
+    
+    /**
+     * 个人用户的配置面板
+     * 
+     * @access public
+     * @param Typecho_Widget_Helper_Form $form
+     * @return void
+     */
+    public static function personalConfig(Typecho_Widget_Helper_Form $form){}
+    
+    /**
+     * 输出尾部js
+     * 
+     * @access public
+     * @param unknown $footer
+     * @return unknown
+     */
+    public static function footer() {
+        $jsUrl = Helper::options()->pluginUrl . '/LaTex/latex.js';
+        echo '<script type="text/javascript" src="'. $jsUrl .'"></script>';
+    }
+}

LaTex/latex.js

@@ -0,0 +1,13 @@
+(function() {
+	var $ = document.querySelectorAll.bind(document);
+	var latex = $('code.lang-laTex, code.lang-latex, code.lang-tex');
+	for (var i = 0, l = latex.length; i < l; i++) {
+		var node = latex[i];
+		var latex_image = document.createElement("img");
+		latex_image.src = "http://latex.codecogs.com/png.latex?"+ node.innerHTML;
+
+		var parent = node.parentNode;
+		parent.insertBefore(latex_image, node);
+		parent.removeChild(node);
+	}
+})();