module Middleman::Renderers::Markdown

def registered(app)
  # Set our preference for a markdown engine
  # TODO: Find a JRuby-compatible version
  app.set :markdown_engine, :maruku
  app.set :markdown_engine_prefix, ::Tilt
  app.before_configuration do
    template_extensions :markdown => :html,
                        :mdown    => :html,
                        :md       => :html,
                        :mkd      => :html,
                        :mkdn     => :html
  end
  # Once configuration is parsed
  app.after_configuration do
    
    begin
      # Look for the user's preferred engine
      if markdown_engine == :redcarpet
        require "middleman-core/renderers/redcarpet"
        ::Tilt.prefer(::Middleman::Renderers::RedcarpetTemplate)
      elsif markdown_engine.nil?
        # Map symbols to classes
        markdown_engine_klass = if markdown_engine.is_a? Symbol
          engine = markdown_engine.to_s
          engine = engine == "rdiscount" ? "RDiscount" : engine.camelize
          markdown_engine_prefix.const_get("#{engine}Template")
        else 
          markdown_engine_prefix
        end
      
        # Tell tilt to use that engine
        ::Tilt.prefer(markdown_engine_klass)
      end  
    rescue LoadError
      $stderr.puts "Requested Markdown engine (#{markdown_engine}) not found. Maybe the gem needs to be installed and required?"
    end
  end
end