Fading out notifier for screen saver

screen-fader.sh

#!/bin/bash

SEC=10
[ $# -eq 1 ] && SEC=$1
FRAMES=100
SLEEP=`echo $SEC / $FRAMES | bc -l`

trap "xcalib -clear" EXIT

sleep 0.1

LAST_IDLE=`xprintidle`
for (( i = 1; i <= $FRAMES; i++ )); do
  NEW_IDLE=`xprintidle`
  if [ $LAST_IDLE -gt $NEW_IDLE ]; then
    exit 0
  fi
  LAST_IDLE=$NEW_IDLE
  xcalib -co 95 -a
  sleep $SLEEP
done

xset dpms force off