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#!/bin/bash -x
# Example notifier script -- lowers screen brightness, then waits to be killed
# and restores previous brightness on exit.
## CONFIGURATION ##############################################################
# Brightness will be lowered to this value.
min_brightness=500
# If your video driver works with xbacklight, set -time and -steps for fading
# to $min_brightness here. Setting steps to 1 disables fading.
fade_steps=20
# Time to sleep (in seconds) between increments when using sysfs. If unset or
# empty, fading is disabled.
fade_step_time=0.05
###############################################################################
get_brightness() {
brightnessctl get
}
set_brightness() {
brightnessctl set $1
}
fade_brightness() {
local level
local value=$(get_brightness)
local decrement=$((($value - $1) / $fade_steps))
for level in $(eval echo {$fade_steps..1}); do
local value=$(($value - $decrement))
set_brightness $value
sleep $fade_step_time
done
}
trap 'exit 0' TERM INT
trap "set_brightness $(get_brightness); kill %%" EXIT
fade_brightness $min_brightness
sleep 2147483647 &
wait
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