#! /bin/sh

###
#
# A sort of screen saver using iHook. A temporary solution for
# the lack of screen saver at the Mac OS X login screen.
#
###

PATH=/bin:/usr/bin; export PATH

# trap SIGTERM, which iHook sends when the user clicks the cancel button,
# and exit cleanly, so iHook goes away without a fuss.
trap "exit 0" 15

# set the first background image.
echo %BACKGROUND /Some/Custom/Image/Telling/User/How/To/Kill/iHook

# enable the cancel button, so the user can kill iHook and login.
echo %CANCEL ENABLE
echo Click the Cancel button to get to the login screen.
sleep 5

# Enter an infinite loop. The user will be killing the process when they
# click the cancel button to get back to the login screen. The sleeps give
# the user time to click the cancel button.

while [ true ]; do

    # move the iHook window around the screen. You may also want to change
    # the iHook window size with the %WINDOWSIZE directive.
    echo %WINDOWPOSITION TOP LEFT
    sleep 5
    echo %WINDOWPOSITION TOP RIGHT
    echo %BACKGROUND /Another/Custom/Image/Describing/How/To/Login
    sleep 5
    echo %WINDOWPOSITION BOTTOM RIGHT
    echo %BACKGROUND /Yet/Another/Image
    sleep 5
    echo %WINDOWPOSITION BOTTOM LEFT
    echo %BACKGROUND /Still/Another/Image
    sleep 5
    echo %WINDOWPOSITION CENTER
    echo %BACKGROUND /Some/Custom/Image/Telling/User/How/To/Kill/iHook
    sleep 5

done

exit 0