Go app to print default sink and volume (int54)

audio.go

package main

import (
	"fmt"
	"strings"
	"os/exec"
	"strconv"
)

const vmax = 65635
const vmin = 0

func getdefault() (string, int64) {
	var sink string
	var volume int64

	out, err := exec.Command("pacmd", "dump").Output()
	if err != nil {
		fmt.Println(err)
	}
	lines := strings.Split(string(out), "\n")
	// Get sink
	for _, line := range lines {
		if (strings.HasPrefix(line, "set-default-sink")) {
			sink = string(strings.Replace(line, "set-default-sink ", "", 1))
		}
	}
	// Get volume
	for _, line := range lines {
		if (strings.HasPrefix(line, "set-sink-volume " + sink)) {
			
			volume, _  = strconv.ParseInt(strings.Replace(line, "set-sink-volume " + sink + " ", "", 1), 0, 64)
		}
	}
	return sink, volume
}

func setvolume(sink string, volume int64){
	if (volume > vmax){
		volume = vmax
	}
	if (volume <= vmin){
		volume = vmin
	}
	out, err := exec.Command("pactl", "set-sink-volume", sink, strconv.FormatInt(volume, 10)).Output()
	if err != nil {
		fmt.Println(err, out)
	}
}

func main() {
	sink, vol := getdefault()
	setvolume(sink, vol - 1000)

	fmt.Println(getdefault())
}