polybar_launch.sh

#!/bin/bash

check-display() {
  xrandr | grep $1 | grep " connected" | awk '{ print$1 }'
}

# Terminate already running bar instances
killall -q polybar

# Wait until the processes have been shut down
while pgrep -u $UID -x polybar >/dev/null; do sleep 1; done

DISPLAY1="$(check-display "eDP1")"
DISPLAY2="$(check-display "DP2")"
DISPLAY3="$(check-display "HDMI1")"

[[ ! -z "$DISPLAY1" ]] && MONITOR="$DISPLAY1" polybar main &
[[ ! -z "$DISPLAY2" ]] && MONITOR="$DISPLAY2" polybar extra &
[[ ! -z "$DISPLAY3" ]] && MONITOR="$DISPLAY3" polybar extra &