4. Select one or more system events from this list on the System Events tab:
OnChunkFormRender (chunk editor - html highlighting)
OnDocFormRender (Document editor if you are not using an RTE - html highlighting)
OnModFormRender (module editor - php highlighting)
OnPluginFormRender (plugin editor - php highlighting)
OnSnipFormRender (Snippet editor - php highlighting)
OnTempFormRender (template editor - html highlighting)
[[ImportTemplateFile? &filename=`assets/templates/yarn/index.html`]]
<?php
$filename= (isset($filename)) ? $filename: "index.html";
$output = implode ('', file($filename));
return $output;
?>