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|
#!/usr/bin/env sh
die() {
echo "ERROR: $1"
exit 1
}
help() {
cat <<EOF
This is a system brightness manager
USAGE:
$NAME set VALUE
OPTIONS:
--help | -h
Output this help and exit.
COMMANDS:
set VALUE
Set the brightness to the specified percentage.
ARGUMENTS:
VALUE := [[seq 0 100]]
The amount to increase/decrease the brightness. In percentage
EOF
}
BACKLIGHT="/sys/class/backlight/$BACKLIGHT_NAME"
brightness() {
perc="$1"
max="$(cat "$BACKLIGHT/max_brightness")"
new="$(echo | awk --assign=perc="$perc" '{printf (perc / 100)}')"
output="$(echo | awk --assign=new="$new" --assign=max="$max" '{printf max * new}')"
echo "$output" >"$BACKLIGHT/brightness"
}
for arg in "$@"; do
case "$arg" in
"--help" | "-h")
help
exit 0
;;
esac
done
[ "$(id --user)" != 0 ] && die "This script requires root (as it needs to write into '$BACKLIGHT/brightness')"
case "$1" in
"set")
shift 1
if [ -n "$1" ]; then
value="$1"
else
die "No value specified"
fi
brightness "$value"
;;
*)
die "The command '$1' does not exist! See '--help' for a list"
;;
esac
# vim: ft=sh
|
