# Extracted from /etc/acpi/powerbtn.sh and modified
# shuber@sthu.org


# Taken from Debian's 2.0.4-1 diff file.  This version handles KDE4.
# Power Button event handler.
# Checks to see if gnome or KDE are already handling the power button.
# If not, initiates a plain shutdown.

# getXuser gets the X user belonging to the display in $displaynum.
# If you want the foreground X user, use getXconsole!
# Input:
#   displaynum - X display number
# Output: 
#   XUSER - the name of the user
#   XAUTHORITY - full pathname of the user's .Xauthority file
getXuser() {
	user=`pinky -fw | awk '{ if ($2 == ":'$displaynum'" || $(NF) == ":'$displaynum'" ) { print $1; exit; } }'`
	if [ x"$user" = x"" ]; then
		startx=`pgrep -n startx`
		if [ x"$startx" != x"" ]; then
			user=`ps -o user --no-headers $startx`
		fi
	fi
	if [ x"$user" != x"" ]; then
		userhome=`getent passwd $user | cut -d: -f6`
		export XAUTHORITY=$userhome/.Xauthority
	else
		export XAUTHORITY=""
	fi
	export XUSER=$user
}

# Gets the X display number for the active virtual terminal.
# Output:
#   DISPLAY - the X display number
#   See getXuser()'s output.
getXconsole() {
	pid=$(pgrep -x X | head -n 1)
	if [ x"$pid" != x"" ]; then
		displaynum=`ps -p "$pid" -o args | sed -n -re 's,.*/X .*:([0-9]+).*,\1,p'`
		if [ x"$displaynum" != x"" ]; then
			export DISPLAY=":$displaynum"
			getXuser
		fi
	fi
}