module Middleman::Renderers::ERb

def registered(app)
  # Setup a default ERb engine
  app.set :erb_engine, :erb
  app.set :erb_engine_prefix, ::Tilt
  app.before_configuration do
    template_extensions :erb => :html
  end
  # After config
  app.after_configuration do
    # Find the user's prefered engine
    # Convert symbols to classes
    if erb_engine.is_a? Symbol
      engine = engine.to_s
      engine = engine == "erb" ? "ERB" : engine.camelize
      erb_engine = erb_engine_prefix.const_get("#{engine}Template")
    end

    # Tell Tilt to use the preferred engine
    ::Tilt.prefer(erb_engine)
  end
end