nice HTML pre-processor

 htp is an HTML pre-processor. It is designed to be a flexible authoring tool
 that can easily be integrated into the HTML design process.
 .
 It is able to preprocess HTML, XHTML, XML and CSS files (it could handle
 any text based files). Its purpose is to assist on maintaining a consistent
 look over an entire set of web pages. This is done by allowing someone to
 define their own tags as abbreviations for sets of standard HTML tags.
 .
 Those looking for a tool that allows handling HTML files with any text
 editor, not graphical based editors only, will find htp very helpful since
 it runs from the command-line to build the final HTML code that goes on the
 HTTP server.
 .
 Documentation and examples are included.