#!/bin/bash

i3status | while :
do
    read line

    SPOTIFY_WIN_ID=$(xwininfo -root -all | grep "\"spotify\" \"Spotify\"" | cut -d '"' -f 1 | sed -n 1p | sed -e 's/^[[:space:]]*//')

    NOWPLAYING=$(xprop -id $SPOTIFY_WIN_ID | grep WM_NAME | cut -d '"' -f 2 | sed -n 1p)

    echo -n "${NOWPLAYING} | ${line}" || exit 1

done