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#!/bin/sh
. slib
help() {
cat << EOF
${0}: Wrapper script to change backlight
options:
-i [Brg] Increase backlight by Brg
-d [Brg] Decrease backlight by Brg
-s [Brg] Set backlight to Brg
-p Show the current backlight
-h Print this message and exit
NOTE: Script interprets values as percentages
EOF
exit 0
}
check_program "brightnessctl"
[ ${#} != 1 ] && [ ${#} != 2 ] && invalid_use
while getopts "i:d:s:ph" option; do
case "${option}" in
i) run --reload-status "brightnessctl set +${OPTARG}%" ;;
d) run --reload-status "brightnessctl set ${OPTARG}-%" ;;
s) run --reload-status "brightnessctl set ${OPTARG}%" ;;
p)
if ! echo $(( ($(brightnessctl g) * 100) / $(brightnessctl m) )); then
err "Failed to get current brightness"
else
exit 0
fi
;;
h) help ;;
*) invalid_use -h ;;
esac
done
# Unreachable
invalid_use
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