#!/bin/sh
# slideshow.sh -- output a series of gifs for a slideshow
# Created by Howard Cohen, copyright 1996. A Timefold(tm) product.
# hoco@timefold.com, http://www.timefold.com
#
# Right to use granted as long as the above copyrights and credits are
# not altered.

me=slideshow.sh

wwwroot=/usr/home/hoco/pub/hoco/public_html
		# this is the pathname down to the root of the web area,
		# where you would find your home.html.  Go to that
		# directory and execute 'pwd' to find out what to put
		# here.  If you happen to see "/auto" or "/tmp_mount" at
		# the front of the pathname, strip off that part when you
		# specify the name here. [trust me -- hsc]

debugfile=$wwwroot/cgi/scripts/debug/slidebug

debug=N		# set to Y to turn on debugging, but be sure to choose 
		# a debugfile which you can access.  /tmp may be
		# on a different machine (the one serving the web) from
		# the machine you log into in order to work on web pages.
		# also, the debug file must exist in a writable directory.

	
delay=0		# set to a number of seconds to delay between slides, maybe...

slidedir="$wwwroot/$PATH_INFO"	# This is the path from the root of the 
				# web down to the directory containing the 
				# slides.

if [ "$debug" = "Y" ]
then
    umask 0
    rm -f $debugfile
    date >$debugfile
    pwd >>$debugfile
    echo "$me" "$@" >>$debugfile
    echo "slidedir=$slidedir"  >> $debugfile
    env >> $debugfile
fi

cd $slidedir

slides=`ls *.gif | sort -n`
if [ "$debug" = "Y" ]
then
    echo "$slides" >>$debugfile
fi

# this header is required to run server push scripts
echo "HTTP/1.0 200 Okay"

# this prints the required Content-type header and defines the boundary 
# string.  Notice that there is no space after the semicolon.
# There is also a blank line after the header.
echo "Content-type: multipart/x-mixed-replace;boundary=slide"
echo

for sl in $slides
do
    # here is a new slide
    echo "--slide"

    # Introduce the content type and include a blank line
    echo "Content-type: image/gif"
    echo
    if [ "$debug" = "Y" ]
    then
	echo sending $sl >>$debugfile
    fi

    cat $sl

    if [ "$delay" -gt 0 ]
    then
	sleep $delay
    fi
    echo
done

echo "--slide--"