class Film def initialize(stdout, terminal) @stdout = stdout @terminal = terminal end def snapshot_at(time) stdout_each_until(time) do |delay, data| terminal.feed(data) end terminal.snapshot end def frames frames = stdout.map do |delay, data| terminal.feed(data) [delay, Frame.new(terminal.snapshot, terminal.cursor)] end FrameDiffList.new(frames) end private def stdout_each_until(seconds) stdout.each do |delay, frame_data| seconds -= delay break if seconds <= 0 yield(delay, frame_data) end end attr_reader :stdout, :terminal end