Below you will find the code for version 0.2 of the Wikilink plugin by Auz. This is just a mirror of the most up to date code that is available here

<?php
class NP_WikiLink extends NucleusPlugin {
 
  // name of plugin
  function getName() {
    return 'WikiLink';
  }
 
  // author of plugin
  function getAuthor() {
    return 'Auz';
  }
 
  // an URL to the plugin website
  // can also be of the form mailto:foo@bar.com
  function getURL() {
    return 'http://www.auzsoft.net/';
  }
 
  // version of the plugin
  function getVersion() {
    return '0.3';
  }
 
  // a description to be shown on the installed plugins listing
  function getDescription() {
    return 'Replaces [[Wiki]] and [[Wiki (site)|Wiki]] coding with links to Wikipedia';
  }
 
  function getEventList() {
    return array('PreItem');
  }
 
  function event_PreItem($data) {
    $this->currentItem = &$data["item"];
 
		$this->currentItem->body = NP_WikiLink::wikiLink( $this->currentItem->body );
		$this->currentItem->more = NP_WikiLink::wikiLink( $this->currentItem->more );
 
//    $this->currentItem->body = preg_replace( "/\[\[(.+?)\|(.+?)\]\]/", "<a href=\"http://en.wikipedia.org/wiki/\\1\" target=\"_blank\" title=\"Wikipedia: \\2\">\\2</a>", $this->currentItem->body );
//    $this->currentItem->more = preg_replace( "/\[\[(.+?)\|(.+?)\]\]/", "<a href=\"http://en.wikipedia.org/wiki/\\1\" target=\"_blank\" title=\"Wikipedia: \\2\">\\2</a>", $this->currentItem->more );
 
 
//    $this->currentItem->body = preg_replace( "/\[\[(.+?)\]\]/", "<a href=\"http://en.wikipedia.org/wiki/\\1\" target=\"_blank\" title=\"Wikipedia: \\1\">\\1</a>", $this->currentItem->body );
//    $this->currentItem->more = preg_replace( "/\[\[(.+?)\]\]/", "<a href=\"http://en.wikipedia.org/wiki/\\1\" target=\"_blank\" title=\"Wikipedia: \\1\">\\1</a>", $this->currentItem->more );
  }
 
	function wikiLink( $text ) {
		$links = preg_match_all( "/(\[\[.+?\]\])/", $text, $wiki, PREG_SET_ORDER );
 
		for( $i=0; $i<$links; $i++ ) {
			$link = preg_match( "/^\[\[(.+?)\]\]$/", $wiki[$i][0], $item );
			//$info .= $item[1];
			$split = explode( "|", $item[1] );
			if ( count($split) == 2 ) {
				$linkage = "<a href=\"http://en.wikipedia.org/wiki/$split[0]\" target=\"_blank\" title=\"Wikipedia: $split[0]\">$split[1]</a>";
			} else {
				$linkage = "<a href=\"http://en.wikipedia.org/wiki/$split[0]\" target=\"_blank\" title=\"Wikipedia: $split[0]\">$split[0]</a>";
			}
			$text = str_replace( $item[0], $linkage, $text );
		}
		return($text);
	}
}
?>