new

# File railties/lib/rails/rack/log_tailer.rb, line 4
      def initialize(app, log = nil)
        @app = app

        path = Pathname.new(log || "#{File.expand_path(Rails.root)}/log/#{Rails.env}.log").cleanpath
        @cursor = ::File.size(path)

        @file = ::File.open(path, 'r')
      end