A go code program failed to run in the background - go

Question

Go code running in the background
I am a beginner of the go language.
I wrote a small program that made a keyboard sound.
After go build main.go, you can hear the sound of the button in the current shell.
But when running ./main in the background or when re-opening a new shell will not hear the button sound.
This is what I need help with.
package main
import (
"fmt"
"github.com/eiannone/keyboard"
"github.com/faiface/beep"
"github.com/faiface/beep/speaker"
"github.com/faiface/beep/wav"
"os"
"time"
"log"
"path/filepath"
)
func main(){
env:= os.Getenv("HOME")
fmt.Println(env)
err := keyboard.Open()
if err != nil {
panic(err)
}
defer keyboard.Close()
for {
char, key, err := keyboard.GetKey()
if err != nil {
log.Fatal(err)
}else if (key == keyboard.KeyEsc){
break
}
n := int(char)
path := "./wav/*.wav"
fpath,_ := filepath.Glob(path)
name := fpath[n]
f, err := os.Open(name)
if err != nil {
log.Fatal(err)
}
streamer, format, err := wav.Decode(f)
if err != nil {
log.Fatal(err)
}
defer streamer.Close()
speaker.Init(format.SampleRate, format.SampleRate.N(time.Second/10))
done := make(chan bool)
speaker.Play(beep.Seq(streamer, beep.Callback(func() {
done <- true
})))
<-done
}
}
I want it to run in the background. I can hear the corresponding sound after pressing the keyboard.

Answer 1

If the program is running in the background it will not get any input from the keyboard.
Also since n depends on user input it would be easy for it to exceed the number of sound files and you would get an index out of bounds error at run-time. You should do something like this:
if fpath, _ := filepath.Glob("./wav/*.wav"); len(fpath) > 0 {
n := int(char)%len(fpath)
name := fpath[n]
...