#!/bin/sh -e

screen_is_on() {
    [ "$(brightnessctl g)" -ne 0 ]
}

turn_on_screen() {
    brightnessctl -r
}

turn_off_screen() {
    brightnessctl -s
    brightnessctl s 0
}

if screen_is_on; then
    turn_off_screen
else
    turn_on_screen
fi