[polybar] Start polybar on all monitors and restart on monitor configuration change

config.ini

[barsettings]
monitor = ${env:MONITOR:}
; ... any other global settings for all bars ...

[bar/top]
inherit=barsettings
bottom=false

modules-left = ...
modules-center = ...
modules-right = ...

[bar/top-primary]
inherit=bar/top

; you can only have the tray on one of the monitors
tray-position = right

; feel free to also override the modules on non-primary displays if you want

[bar/bottom]
inherit=barsettings
bottom=true

modules-left = ...
modules-center = ...
modules-right = ...

[bar/bottom-primary]
inherit=bar/bottom

[settings]
; disable the builtin XCB_RANDR_SCREEN_CHANGE_NOTIFY handling
screenchange-reload = false

i3

exec --no-startup-id $HOME/.config/polybar/launch_on_monitor_change.py

launch.sh

#!/bin/bash

# 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

# Launch Polybar, using default config location ~/.config/polybar/config
polybar --list-monitors | while read -r line; do
    m=$(echo $line | cut -d":" -f1)
    if [[ "$line" == *"(primary)"* ]]; then
        MONITOR=$m polybar --reload bottom-primary &
        MONITOR=$m polybar --reload top-primary &
    else
        MONITOR=$m polybar --reload bottom &
        MONITOR=$m polybar --reload top &
    fi
done

echo "Polybar launched..."

launch_on_monitor_change.py

#!/usr/bin/python3
import xcffib
from xcffib.xproto import *
import xcffib.randr
import os

conn = xcffib.connect()
setup = conn.get_setup()
root = setup.roots[0].root
randr = conn(xcffib.randr.key)
randr.SelectInput(root, xcffib.randr.NotifyMask.ScreenChange)
conn.flush()

os.system("/home/krzys_h/.config/polybar/launch.sh")
while True:
    event = conn.wait_for_event()
    if isinstance(event, xcffib.randr.ScreenChangeNotifyEvent):
        os.system("/home/krzys_h/.config/polybar/launch.sh")