progress-printer.go

package main

import (
	"fmt"
	"time"

	"github.com/fatih/color"
)

var startTime = time.Hour * 8
var normalEndTime = time.Hour*18 + time.Minute*0
var fridayEndTime = time.Hour*14 + time.Minute*30
var summerEndTime = time.Hour*14 + time.Minute*30
var progressPrinter = color.New(color.FgHiCyan)

func main() {
	dayProgressCurr := int((currtime() - startTime).Minutes())
	dayProgressEnd := int((todaysEndTime() - startTime).Minutes())
	fmt.Println("Day progress...")
	loadUntil(
		dayProgressCurr/10,
		dayProgressEnd/10,
	)
	fmt.Printf("%.1f hours left\n", float64(dayProgressEnd-dayProgressCurr)/60.0)
	color.HiBlue("Not having caffeine for a month...")
	loadUntil(time.Now().Day(), 30)
}

func currtime() time.Duration {
	now := time.Now()
	m, h := time.Duration(now.Minute()), time.Duration(now.Hour())
	return (time.Minute * m) + (time.Hour * h)
}

func todaysEndTime() time.Duration {
	now := time.Now()
	if now.Weekday() == time.Friday {
		return fridayEndTime
	}
	m := now.Month()
	if m == time.July || m == time.August || (m == time.September && now.Day() < 15) {
		return summerEndTime
	}
	return normalEndTime
}

func loadUntil(n, max int) {
	for i := 0; i <= n; i++ {
		time.Sleep(time.Millisecond * 32)
		progressPrinter.Printf("\r%s %d/%d", string(progressBar(i, max)), i, max)
	}
	fmt.Println()
	if n == 30 {
		fmt.Println("Done!")
	}
}

func progressBar(actual, max int) []rune {
	res := make([]rune, max+2)
	res[0], res[max+1] = '[', ']'
	for i := 1; i <= actual; i++ {
		res[i] = '#'
	}
	for i := actual + 1; i < max+1; i++ {
		res[i] = '-'
	}
	return res
}