Seems quite a few web apps / websites have this stuff in Boot...

    def filter(m:Matcher):String = {
      val filter_name = m.group(1)
      val body = m.group(2)
      engine.filter(filter_name) match {
        case Some(filter)=>
          filter.filter(RenderContext(), body)
        case None=> "<div class=\"macro error\"><p>filter not found: %s</p><pre>%s</pre></div>".format(filter_name, body)
      }
    }

    def pygmentize(m:Matcher):String = Pygmentize.pygmentize(m.group(2), m.group(1))

    // add some macros to markdown.
    Markdown.macros :::= List(
      MacroDefinition("""\{filter::(.*?)\}(.*?)\{filter\}""", "s", filter, true),
      MacroDefinition("""\{pygmentize::(.*?)\}(.*?)\{pygmentize\}""", "s", pygmentize, true),
      MacroDefinition("""\{pygmentize\_and\_compare::(.*?)\}(.*?)\{pygmentize\_and\_compare\}""", "s", pygmentize, true)
    )

    // add some more recognized pipelines.
    for( ssp <- engine.filter("ssp"); md <- engine.filter("markdown") ) {
      engine.pipelines += "ssp.md"-> List(ssp, md)
      engine.pipelines += "ssp.markdown"-> List(ssp, md)
    }

Shouldn't this kinda stuff be added by default?