Extension:CodeTag

{{TNT|Extension 1.17+ ( and probably much earlier ) see below Read changelog ]] Provides a syntax highligher using GeSHi
 * name     = Code
 * status   = beta
 * type1    = tag
 * type2    =
 * hook1    = ParserFirstCallInit
 * username = Gri6507
 * author   = Paul Grinberg
 * image    =
 * license  = GPL
 * version  = 0.9
 * update   = 2011-07-18
 * mediawiki =
 * download =
 * needs-updatephp = No
 * readme   =
 * changelog = [[#Revisions|
 * description =
 * parameters= * $language
 * $showLineNumbers
 * $showDownloadLink
 * $tabwidth
 * $source
 * rights   =
 * example  =
 * tags     = *

Step 2
Add the following text to your :

Usage
The extension has the following usage:

where options are: lang='s'      This is the language type that explains how to highlight the code. Default is 'text'. See GeSHi for full list of supported syntaxes linenumbers   Turn on line numbers for each line in your code download      Turn on the "Download Code" link for this block of your code tabwidth='n'  How many spaces does a TAB represent fileurl='s'   Instead of processing the code provided between the tags, process the code at specified URL

Revisions
Updated for MediaWiki 1.17+ initial release on MW.
 * v0.9 - 2011-07-18 -
 * v0.8 - 2010-04-29 -

mash-up RawFile/Geshi/CodeFile
I'm working on Extension:RawCodeFile it's a mix of 2 extensions, including this one, updated. It works under 1.25+ if geshi is installed.