Golang Terminal Percent Bar

main.go

package main

import (
	"fmt"
	"math"
	"strings"
	"time"
)

var (
	csr = []rune{' ', '▏', '▎', '▍', '▌', '▋', '▊', '▉'}
	cR  = '█'
)

func main() {
	fmt.Print("\033[?25l")
	defer func() { fmt.Println("\033[?25h") }()
	var p float64
	for i := 0.0; i <= 1000; i++ {
		p = i / 1000
		fmt.Printf("\r%.3d%% >%s<\033[K %.03f", int(p*100), cE(p, 20, true), p)
		time.Sleep(5 * time.Millisecond)
	}
}

func cE(percent float64, size int, color bool) (bar string) {

	if color {
		bar += "\033[32m\033[41m"
	}

	pS := float64(size) * percent
	pSR := int(math.Floor(pS))

	bar += strings.Repeat(string(cR), pSR)

	var pFM float64

	if pSR != 0 {
		pFM = math.Mod(pS, math.Floor(pS))
	} else {
		pFM = pS
	}

	if pSR != size {
		id := pFM * float64(len(csr)-1)
		iR := int(math.Round(id))
		bar += string(csr[iR])
	}

	if (size-pSR)-1 >= 0 {
		bar += strings.Repeat(" ", (size-pSR)-1)
	}

	// RESET Codes
	if color {
		bar += "\033[0m\033[41m\033[0m"
	}

	// fmt.Printf("\033[0mpS: %0.2f   pSR: %d   pFM: %.2f   id: %0.2f   r: %d %s\n", pS, pSR, pFM, id, iR, bar)

	return bar
}

func percent() float64 {
	now := time.Now()

	currentInterval := uint64(math.Floor(float64(now.Unix()) / 30.0))

	// fmt.Println(currentInterval)

	nextIntervalTime := time.Unix(int64((currentInterval+1)*30), 0)
	timeUntilNextInterval := nextIntervalTime.Sub(now).Milliseconds()

	// fmt.Println(timeUntilNextInterval)
	// fmt.Printf("%v%%\n", math.Floor((float64(timeUntilNextInterval)/30000.0)*100))

	totalIntervalTime := 30000 // Interval duration in milliseconds
	remainingPercentage := float64(timeUntilNextInterval) / float64(totalIntervalTime)
	return remainingPercentage
}