loop3.go

func (bt *BlinkyTape) playPattern(p Pattern, delay time.Duration) {
	bt.clear()

L:
	for _, frame := range p {
		bt.setFrame(frame)

		if err := bt.render(); err != nil {
			log.Fatalf("render error: %s\n", err)
		}
		timer := timer.NewTimer(delay)
		timer.Start()

		stop := bt.stop
		pause := bt.pause
		resume := nil
		timerC := nil

		select {
		case <-stop:
			stop <- struct{}{}
			break L
		case <-pause:
			if paused := timer.Pause(); paused != false {
				// stop = bt.stop
				pause = nil
				resume = bt.resume
				timerC = nil
			}
		case <-resume:
			if started := timer.Start(); started != false {
				// stop = bt.stop
				pause = nil
				resume = nil
				timerC = timer.C
			}
		case <-timerC:
			continue L
		}
	}
	bt.next <- struct{}{}
}