redshiftbrightness.sh

#!/bin/bash

input="$1"
#either 1 or -1, must be int

#turn off redshift animations if you don't want to commit die

pid=$(pidof redshift)

if [[ $pid -eq 0 ]]
then
  number=10
else
  current=$(ps --no-headers $pid | awk '{print $7}')
  number="${current//.}"
fi

new=$((number + input))

if (( $new > 10 ))
then
  #echo "Redshift: Max brightness reached"
  new=10
fi

if (( $new < 1 ))
then
  #echo "Redshift: Min brightness reached"
  new=1
fi

displayval=$((new * 10))

newnum=$(echo "scale=1; $new/10" | bc)
#convert 10 to 1.0 etc

killall redshift
redshift -b "${newnum}" &

if [ ! -s /dev/shm/rsnotifid ]
then
  #echo "Redshift brightness: creating temp file"
  touch /dev/shm/rsnotifid
  echo 0 > /dev/shm/rsnotifid
fi

replaceid=$(cat /dev/shm/rsnotifid)

replaceidnew=$(gdbus call --session --dest org.freedesktop.Notifications --object-path /org/freedesktop/Notifications --method org.freedesktop.Notifications.Notify redshiftbrightness.sh ${replaceid} redshift "" "" [] "{'String':<0>,'value':<${displayval}>,'String':<0>,'transient':<'true'>}" 2000 | cut -c 9- | egrep -o '[0-9]+')

echo $replaceidnew > /dev/shm/rsnotifid