~/.zshrc,~/.bin/since.go: Display exit code if command fails

.bin/since.go

func main() {
	last := os.Args[1]
	cmdName := os.Args[2]
	exitStatus := os.Args[3]
	t, err := time.Parse(time.RFC3339Nano, last)
	if err != nil {
		return
		// notify window manager (bell character, some window managers/terminals mark when it appears)
		fmt.Printf("\a")
		// send notification for long-running commands
		cmd := exec.Command("notify-send", fmt.Sprintf("%q done", cmdName), fmt.Sprintf("took %s", dur))
		statusInfo := "done"
		if exitStatus != "0" {
			statusInfo = fmt.Sprintf("failed (%s)", exitStatus)
		}
		cmd := exec.Command("notify-send", fmt.Sprintf("%q %s", cmdName, statusInfo), fmt.Sprintf("took %s", dur))
		cmd.Start()
	}
	fmt.Printf("(%s) ", dur)

.zshrc

autoload colors && colors
function precmd {
	last_exit="$?"
	echo -ne "\033]0;\007"
	user="%{$fg[red]%}%n%{$reset_color%}"
	dir="%{$fg[cyan]%}%~%{$reset_color%}"
	duration=$(since "$__last_cmd_time" "$history[$(($HISTCMD-1))]")
	duration=$(since "$__last_cmd_time" "$history[$(($HISTCMD-1))]" "$last_exit")
	# store last cmd in psvar[1] (magically avoids escaping problems?)
	psvar[1]="$history[$(($HISTCMD-1))]"
	if [ -n "$SSH_CONNECTION" ]; then