File heartbeat of Package xss-lock

#!/bin/bash

: ${DISPLAY=:0}
export DISPLAY
: ${XDG_CONFIG_HOME=$HOME}

typeset -i xset=1
typeset -a screens=($(xvinfo -display ${DISPLAY} 2>/dev/null |sed -rn 's/^screen\s+#([0-9]+)$/\1/p'))

if test -s ${XDG_CONFIG_HOME}/xss-lock/xset
then
    . ${XDG_CONFIG_HOME}/xss-lock/xset
else
    xset s blank
    xset s on
    xset s 600 300
    xset +dpms
    xset dpms 1200 1800 2400
fi

checkFullscreen()
{
    local scr
    local activ_win_id

    for scr in ${screens[*]}
    do
	activ_win=($(xprop -display ${DISPLAY}.${scr} -root _NET_ACTIVE_WINDOW 2>/dev/null))
	if test -n "$(xwininfo -id ${activ_win[4]} -display ${DISPLAY}.${scr} -wm 2>/dev/null | grep Fullscreen)"
	then
	    xset s reset
	    if ((xset > 0))
	    then
		xset s noblank
		xset s off
		xset -dpms
		let xset=0
	    fi
	else
	    if ((xset == 0))
	    then
		if test -s ${XDG_CONFIG_HOME}/xss-lock/xset
		then
		    . ${XDG_CONFIG_HOME}/xss-lock/xset
		else
		    xset s blank 
		    xset s on
		    xset s 600 300 
		    xset +dpms 
		    xset dpms 1200 1800 2400
		fi
		let xset++
	    fi
	fi
    done
}

while sleep 10
do
    checkFullscreen
done