module Useless
  module Doc
    module Rack

      # +Doc::Rack::Stylesheet+ serves the stylesheet for the current +Doc::UI+
      # iff the request path is '/doc.css'. Otherwise, it passes the request
      # through.
      # 
      class Stylesheet
        def initialize(app)
          @app = app
        end

        def call(env)
          unless env['useless.doc.ui']
            raise 'No UI specified.'
          end

          if env["PATH_INFO"].to_s == '/doc.css'
            [200, {'Content-Type' => 'text/css'}, [env['useless.doc.ui'].css]]
          else
            @app.call(env)
          end
        end
      end
    end
  end
end