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#!/usr/bin/env bash
#
# Sets backlight through /sys/class/backlight/intel_backlight/brightness
# Note: This requires the file to be user-writable!
# Changes can be applied either by (positive or negative) relative increment
# [-i] or as an absolute value [-s] (in percentage).
set -euo pipefail
# brightness steps in percentage
brightness_step_size=5
brightness_device=/sys/class/backlight/intel_backlight/brightness
brightness_max_device=/sys/class/backlight/intel_backlight/max_brightness
calculated_brightness=0
amount=0
brightness_steps=$(echo "100/${brightness_step_size}" |bc -l)
maximum_brightness_raw=$(cat $brightness_max_device)
current_brightness_raw=$(cat $brightness_device)
brightness_one_percent_raw=$(echo "${maximum_brightness_raw}/100" |bc -l)
current_brightness_percentage=$(echo "${current_brightness_raw}/(${maximum_brightness_raw}/100)" |bc -l)
current_brightness_remainder=$(echo "${current_brightness_percentage}%${brightness_step_size}"|bc -l)
current_step=$(echo ${current_brightness_percentage}/${brightness_step_size}|bc -l)
check_if_number() {
if [[ $1 =~ ^[!\-0-9]+$ ]]; then
echo "Not an Integer: $1"
exit 1
fi
}
calculate_increment() {
check_if_number $1
if [ $1 -eq 0 ]; then
echo "There's nothing to do."
exit 1
fi
if [ $1 -gt 0 ]; then
if [ $(printf '%.0f' $current_brightness_percentage) -eq 100 ]; then
echo "Already at 100%"
exit 0
elif [ $(printf '%.0f' $(echo "${current_brightness_percentage}+$1"| bc)) -gt 100 ]; then
calculated_brightness=100
else
calculated_brightness=$(printf '%.0f' $(echo "${current_brightness_percentage}+$1"| bc))
fi
else
if [ $(printf '%.0f' $current_brightness_percentage) -eq 0 ]; then
echo "Already at 0%"
exit 0
elif [ $(printf '%.0f' $(echo "${current_brightness_percentage}+$1"| bc)) -lt 0 ]; then
calculated_brightness=0
else
calculated_brightness=$(printf '%.0f' $(echo "${current_brightness_percentage}+$1"| bc))
fi
fi
}
calculate_percentage() {
check_if_number $1
if [ $1 -lt 0 ] || [ $1 -gt 100 ]; then
echo "Invalid range: $1"
exit 1
fi
calculated_brightness=$1
}
percentage_to_raw() {
printf '%.0f' $(echo "$1*${brightness_one_percent_raw}"|bc -l)
}
set_brightness() {
echo "$(percentage_to_raw $calculated_brightness)" > $brightness_device
}
print_help() {
echo -e "Usage: $0 [-i <increment_in_percent>] [-s <brightness_in_percent>]"
exit 0
}
if [ ${#@} -gt 0 ]; then
while getopts 'hi:s:' flag; do
case "${flag}" in
h)
print_help
;;
i)
calculate_increment $OPTARG
;;
s)
calculate_percentage $OPTARG
;;
*)
echo "Error! Try '${0} -h'."
exit 1
;;
esac
done
else
echo "$current_brightness_percentage"
exit 0
fi
set_brightness
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