#!/bin/bash
source <(systemctl --user show-environment)
SECOND_DISPLAY="${DISPLAY%\.[0-9]*}.1"
if xrandr -d "$SECOND_DISPLAY" -q | grep -q "connected"; then
    [ "$DISPLAY" != "$SECOND_DISPLAY" ] && d="DISPLAY=$SECOND_DISPLAY" || d="DISPLAY=$DISPLAY"
    echo "$d" > ~/.second_display;
else
    rm -f ~/.second_display
fi