Gist Extension for MediaWiki

Gist.php

<?php
# GitHubGist MediaWiki extension v.1
#    Author: Shohei Yokoyama (Shizuoka Univ. Japan)
# 
#-Install
# 1. Save this code as $MediaWikiRoot/extensions/Gist.php
# 2. Append "require_once "$IP/extensions/Gist.php";" to LocalSetting.php
#
#-Usage
#  Tag :
#    <gist><script src="https://gist.github.com/1476815.js"> </script></gist>
#  Tag :
#    <gist>1477057</gist> and <gist>1477057 </gist>

$wgExtensionFunctions[] = 'wfGist';
$wgExtensionCredits['parserhook'][] = array(
        'name' => 'Gist',
        'description' => 'Import Gist entry.',
        'author' => 'Shohei Yokoyama',
        'url' => 'http://shohei.yokoyama.ac/'
);

function wfGist() {
        global $wgParser;
        $wgParser->setHook('gist', 'wfGist_func');
}

function wfGist_func($input,$arg,&$parser) {
	if(preg_match("/^[0-9]+ ?/",$input)){
		return '<script src="https://gist.github.com/'.trim($input).'.js"> </script>';
	}else{
		$script = new SimpleXMLElement($input);
		if(preg_match("/^https\:\/\/gist\.github\.com\/[0-9]+\.js(\?file\=.*)?$/",$script["src"])){
			return '<script src="'.$script["src"].'"> </script>';
		}else{
			return "<b>ERROR: Gist url(".$script["src"].") is invalid.</b>";
		}
	}

}
?>