learngo/15-project-retro-led-clock/exercises/03-split-second/solution/main.go

// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials  : https://learngoprogramming.com
// In-person training  : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus

package main

import (
	"fmt"
	"time"

	"github.com/inancgumus/screen"
)

func main() {
	screen.Clear()

	for {
		screen.MoveTopLeft()

		now := time.Now()
		hour, min, sec := now.Hour(), now.Minute(), now.Second()
		ssec := now.Nanosecond() / 1e8

		clock := [...]placeholder{
			digits[hour/10], digits[hour%10],
			colon,
			digits[min/10], digits[min%10],
			colon,
			digits[sec/10], digits[sec%10],
			dot,
			digits[ssec],
		}

		for line := range clock[0] {
			for index, digit := range clock {
				next := clock[index][line]
				if (digit == colon || digit == dot) && sec%2 == 0 {
					next = "   "
				}
				fmt.Print(next, "  ")
			}
			fmt.Println()
		}

		const splitSecond = time.Second / 10
		time.Sleep(splitSecond)
	}
}