dotfiles/home/.local/bin/scripts/brightness

64 lines
1.7 KiB
Plaintext
Raw Normal View History

2021-07-14 13:33:36 +00:00
#!/bin/sh
BRIGHTNESS_FILE="/sys/class/backlight/intel_backlight/brightness"
BRIGHTNESS_MAX=937
function change_brightness() {
BRIGHTNESS=$(cat $BRIGHTNESS_FILE)
change_value=$2
# If we're dealing with percentages, convert to absolutes
if [ $3 == "%" ]; then
change_value=$((($BRIGHTNESS_MAX / 100) * $change_value))
elif [ $3 == "#" ]; then
change_value=$change_value
else
echo "Invalid unit, options: [% - percent, # - absolute], default: %"
exit 1
fi
# Increment or decrement based on first arg
if [ $1 == "+" ]; then
new_brightness=$(($BRIGHTNESS + $change_value))
elif [ $1 == "-" ]; then
new_brightness=$(($BRIGHTNESS - $change_value))
else
echo "Invalid operator, options: [+, -]"
exit 1
fi
# Make sure we respect min/max boundaries
if [ $new_brightness -lt 0 ]; then
new_brightness=0
elif [ $new_brightness -gt $BRIGHTNESS_MAX ]; then
new_brightness=$BRIGHTNESS_MAX
fi
# Write the brightness (sudo shouldn't require password here)
echo $new_brightness | sudo tee $BRIGHTNESS_FILE
}
if [ $# -ge 1 ] && [ "$1" == "+" ] || [ "$1" == "-" ]; then
if [ $# -lt 2 ]; then
change_value=5 # Default to 5%
else
change_value=$2
fi
if [ $# -lt 3 ]; then
unit="%"
else
unit=$3
fi
change_brightness $1 $change_value $unit > /dev/null
fi
# Display new brightness
BRIGHTNESS=$(cat $BRIGHTNESS_FILE)
BRIGHTNESS_PERCENT=$(echo "($BRIGHTNESS / $BRIGHTNESS_MAX) * 100" | bc -l)
BRIGHTNESS_PERCENT=$(printf "%.2f" $BRIGHTNESS_PERCENT)
echo "Brightness: ${BRIGHTNESS_PERCENT}% (absolute: $BRIGHTNESS)"