class Tilt::Pipeline

def prepare
  @pipeline = self.class::TEMPLATES.inject(proc{|*| data}) do |data, (klass, options)|
    proc do |s,l,&sb|
      klass.new(file, line, options, &proc{|*| data.call(s, l, &sb)}).render(s, l, &sb)
    end
  end
end