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#!/bin/bash
# Usage:
# - setmonitor dp-brightness [increase|decrease|min|max]
# - setmonitor night-light [increase|decrease|day|night]
set -e
if [ $# -ne 2 ]; then
echo 'Check setmonitor source for usage'
exit 1
fi
MONITORS="$(xrandr --listactivemonitors | tail -n +2 | cut -d'+' -f2 | cut -d' ' -f1 | sed 's/^\*//')"
EXTERNAL_MONITORS="$(echo $MONITORS | tr ' ' '\n' | grep -v eDP)"
# Usage: brightness MONITOR
brightness () {
echo "$(xrandr --verbose | grep "^$1" -A5 | grep Brightness | cut -d':' -f2 | sed 's/\s*//')"
}
# Usage: dp_brightness [increase|decrease|min|max] MONITOR
dp_brightness () {
STEP=5
BRIGHTNESS="$(bc <<< "$(brightness "$2")*100")"
case "$1" in
increase) BRIGHTNESS="$(bc <<< "$BRIGHTNESS+$STEP")" ;;
decrease) BRIGHTNESS="$(bc <<< "$BRIGHTNESS-$STEP")" ;;
min) BRIGHTNESS=0 ;;
max) BRIGHTNESS=100 ;;
*)
echo "Invalid argument '$1'"
exit 1
;;
esac
BRIGHTNESS="$(bc <<< "scale=2; $BRIGHTNESS/100")"
xrandr --output "$MONITOR" --brightness "$BRIGHTNESS"
}
# Usage: nightlight [increase|decrease|day|night]
nightlight () {
TMPFILE=/tmp/.night-light-index
# https://askubuntu.com/a/1061304
STEPS=(
"1:0.18172716:0.00000001" "1:0.42322816:0.00000001" "1:0.54360078:0.08679949"
"1:0.64373109:0.28819679" "1:0.71976951:0.42860152" "1:0.77987699:0.54642268"
"1:0.82854786:0.64816570" "1:0.86860704:0.73688797" "1:0.90198230:0.81465502"
"1:0.93853986:0.88130458" "1:0.97107439:0.94305985" "1:1:1"
)
CUR=$((${#STEPS[@]}-1))
if [ -f $TMPFILE ]; then
CUR=$(cat $TMPFILE)
fi
case "$1" in
increase) NEW=$(($CUR >= ${#STEPS[@]} ? $CUR : $CUR+1)) ;;
decrease) NEW=$(($CUR <= 0 ? $CUR : $CUR-1)) ;;
day) NEW=$((${#STEPS[@]}-1)) ;;
night) NEW=0 ;;
*)
echo "Invalid argument '$1'"
exit 1
;;
esac
echo $NEW > $TMPFILE
for MONITOR in $MONITORS; do
BRIGHTNESS=$(brightness "$MONITOR")
xrandr --output "$MONITOR" --gamma "${STEPS[$NEW]}" --brightness "$BRIGHTNESS" || true
done
}
case "$1" in
dp-brightness)
for MONITOR in $EXTERNAL_MONITORS; do
dp_brightness "$2" "$MONITOR"
done
;;
night-light)
nightlight "$2"
;;
*)
echo 'Check setmonitor source for usage'
exit 1
esac
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