#! /bin/sh

###
#
# Another 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

# fill the screen with the iHook window. Requires iHook 0.8.7.
echo %WINDOWSIZE MAX

# 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.

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

while [ true ]; do

    # change the background image periodically, to give the effect of
    # a screensaver. note that the Cancel button may cause some burn in,
    # as it does notchange position, as in the other hook screensaver. you
    # may want to disable/enable/remove it from time to time.
    sleep 5
    echo %BACKGROUND /Another/Custom/Image/Describing/How/To/Login
    sleep 5
    echo %BACKGROUND /Yet/Another/Image
    sleep 5
    echo %BACKGROUND /Still/Another/Image
    sleep 5
    echo %BACKGROUND /Some/Custom/Image/Telling/User/How/To/Kill/iHook
    sleep 5

done

exit 0