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#!/bin/sh
help() {
cat << EOF
${0}: Wrapper script to change backlight
options:
-i [Brg] Increase backlight by Brg
-d [Brg] Decrease backlight by Brg
-s [Brg] Set backlight to Brg
-p Show the current backlight
-h Print this message and exit
NOTE: Script interprets values as percentages
EOF
}
err() {
for line in "${@}"; do
echo "${line}" >&2
done
exit 1
}
run() {
if ! ${1} > /dev/null 2>&1; then
err "${2}"
fi
[ -n "${3}" ] && echo "${3}"
slreload || echo "Warning: Failed to reload slstatus" >&2
exit 0
}
if ! command -v brightnessctl > /dev/null 2>&1; then
err "${0}: brightnessctl must be installed"
fi
if [ ${#} != 1 ] && [ ${#} != 2 ]; then
err "${0}: Invalid usage" "Try '${0} -h' for help."
fi
while getopts "i:d:s:ph" option; do
case "${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 ! echo $(( (`brightnessctl g` * 100) / `brightnessctl m` )); then
err "Failed to get current brightness"
else
exit 0
fi
;;
h) help; exit 0 ;;
*) err "Try '${0} -h' for help." ;;
esac
done
err "${0}: Invalid usage" "Try '${0} -h' for help."
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