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#!/bin/sh
help() {
cat << EOF
$0: Wrapper script to change backlight
options:
-i [Brg] Increase backlight by Brg
-d [Brg] Decrease backlight by Brg
-s [Brg] Set backlight to Brg
-p Show the current backlight
-h Print this message and exit
NOTE: Script interprets values as percentages
EOF
}
err() {
printf "$*\n"
exit 1
}
run() {
if ! $(${1} > /dev/null 2>&1); then
err "%s""${2}"
fi
}
if [ $# != 1 ] && [ $# != 2 ]; then
err "${0}: Invalid usage\nTry '$0 -h' for help."
fi
if ! command -v brightnessctl > /dev/null 2>&1; then
err "brightnessctl must be installed"
fi
while getopts "i:d:s:ph" option; do
case "${option}" in
i)
run "brightnessctl set +${OPTARG}%" \
"${0}: Failed to increase brightness"
;;
d)
run "brightnessctl set ${OPTARG}-%" \
"${0}: Failed to decrease brightness"
;;
s)
run "brightnessctl set ${OPTARG}%" \
"${0}: Failed to set brightness"
;;
p)
if ! brightnessctl 2>/dev/null; then
err "Failed to get current brightness"
fi
;;
h) help; exit 0 ;;
*) err "Try '$0 -h' for help.";;
esac
done
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