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#!/bin/bash
# Get the correct sub-directory for your backlight device
root_path="/sys/class/backlight/"
device="$(find "$root_path" | tail -n 1)"
max="$(cat "$device/max_brightness")"
# What percentage to increase/decrease by when no argument is given
default_step=10
# What percentage to set to when no argument is given
default_set=50
to_percent() {
printf "%d" "$((100 * $1 / $max))"
}
to_value() {
printf "%d" "$((max * $1 / 100))"
}
get_status() {
cat "$device/brightness"
}
get_percent() {
to_percent "$(get_status)"
}
# Add $1 to current brightness. Adjust if out of bounds (0-$max)
# $1 is converted to a value between 0-$max within this function
get_total() {
value="$(to_value "$1")"
printf "%d" "$(($(get_status) + $value))"
}
helpmsg="Usage: backlightctl -[FLAG] [PERCENTAGE]
-i, --increase: Increase brightness by n (default 10%)
-d, --decrease: Decrease brightness by n (default 10%)
-s, --set: Set brightness to specific value (default 50%)
-g --get: Get current brightness
-q, --quiet: Don't send any notification (for use in dwmblocks)
-h, --help: Print this help message
"
case "$1" in
-i | --increase)
[ -z "$2" ] && step="$default_step" || step="$2"
get_total "$step" >"$device/brightness"
;;
-d | --decrease)
[ -z "$2" ] && step="$default_step" || step="$2"
get_total "-$step" >"$device/brightness"
;;
-s | --set)
[ -z "$2" ] && set="$default_set" || set="$2"
to_value "$set" >"$device/brightness"
;;
-g | --get)
printf " %s\n" "$(get_status)%"
;;
-h | --help)
printf "%s" "$helpmsg"
;;
*)
printf "\033[31mInvalid option: $1\033[0m\n%s" "$helpmsg" && exit 1
;;
esac
# Send notification
case "$@" in
*-q* | *--quiet*)
exit 0
;;
*)
notify-send.sh -t 1000 --replace-file /tmp/bl-notif -a " Brightness:" "$(get_percent)%"
;;
esac
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