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#!/usr/bin/env dash
# shellcheck source=/dev/null
SHELL_LIBRARY_VERSION="2.1.2" . %SHELL_LIBRARY_PATH
help() {
cat <<EOF
This is a system brightness manager
USAGE:
$NAME up [VALUE] | down [VALUE]
OPTIONS:
--help | -h
Output this help and exit.
--version | -v
Output the version and exit.
COMMANDS:
up [VALUE]
Increase the brightness by VALUE or 5%.
down [VALUE]
Decrease the brightness by VALUE or 5%.
ARGUMENTS:
VALUE := [[seq 0 100]]
The amount to increase/decrease the brightness. In percentage
EOF
}
BACKLIGHT="/sys/class/backlight/%BACKLIGHT_NAME"
brightness() {
offset="$1"
max="$(cat $BACKLIGHT/max_brightness)"
cur="$(cat $BACKLIGHT/brightness)"
percentage="$(echo | awk --assign=cur="$cur" --assign=max="$max" '{printf cur / max}')"
new="$(echo | awk --assign=per="$percentage" --assign=offset="$offset" '{printf per + (offset / 10)}')"
output="$(echo | awk --assign=new="$new" --assign=max="$max" '{printf max * new}')"
echo "$output" | sudo tee "$BACKLIGHT/brightness" >/dev/null
}
for arg in "$@"; do
case "$arg" in
"--help" | "-h")
help
exit 0
;;
"--version" | "-v")
version
exit 0
;;
esac
done
case "$1" in
"up")
shift 1
value="5"
[ -n "$1" ] && value="$1"
brightness "+$value"
;;
"down")
shift 1
value="-5"
[ -n "$1" ] && value="$1"
brightness "-$value"
;;
*)
die "The command '$1' does not exist! See '--help' for a list"
;;
esac
# vim: ft=sh
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