#! /bin/sh

#               Display Space Shuttle countdown clock

#                           by John Walker
#                      http://www.fourmilab.ch/
#                          October 15, 1995

#       countdown [seconds]

#   The clock is updated every [seconds] seconds.  If no argument is
#   given, it's updated every minute.  A beep is sent to the terminal
#   when the status changes between "Holding" and "Counting".  You can
#   supply a command to play a sound file in lieu of the beep.

#   NASA URL providing the clock

URL=http://www.ksc.nasa.gov/htbin/cdt_clock.pl

#   Command used to retrieve the above URL

#cmd="www -n -source"                 # CERN line-mode browser
cmd="lynx -source"                    # LYNX
#cmd="http_get"                       # Jef Poskanzer's http_get program

#   If not null, command to play sound file when status changes

# sound="cp /usr/lib/sounds/whatever.au /dev/audio"

#   You shouldn't have to change anything below this line.

if [ x$1 = x ]
then
    freq=60
else
    freq=$1
fi

stat=

while true
do
    wallclock=`date +%T`
    mung=`$cmd $URL | grep Minutes | \
        sed "s/.*H2> /$wallclock: /" | sed "s/ <.*$/Z/"`
    echo -n `echo $mung | tr "Z" "\015"`
    s=`echo $mung | sed "s/.*and //"`
    if [ x$stat != x -a x$s != x$stat ]
    then
        if [ "x$sound" != x ]
        then
            $sound
        else
            echo -n `echo XXXXX | tr "X" "\007"`
        fi
    fi
    stat=$s
    sleep $freq
done