#! /bin/sh
# This is the viserver shell script
if [ $# -ne 2 ]
then
        echo "Syntax : $0 inpipe outpipe" 1>&2
#        message goes to window which is about to disappear
#        so wait for user to read it and hit return key
        echo "Hit return to quit" 1>&2 ; read h ; exit 1
fi
inpipe=$1
outpipe=$2
# add possible locations of mknod to PATH
PATH=/etc:"$PATH"
for pipe in "$inpipe" "$outpipe"
do
        if [ ! -p $pipe ]
        then
                echo 2>&1 "$pipe is not a named pipe"
                echo "Hit return to quit" 1>&2 ; read h ; exit 1
        fi
done
# make sure named pipes are removed when server goes away.
trap "rm -f $inpipe $outpipe" 0

# Now pipes are set up, go into loop reading filenames from pipe
# and editing those files.  Indicate when an editing session
# is done by writing filename to ouput pipe.
# If client sends null filename then shut down server (after
# echo filename to outpipe).
echo "Starting editing loop"
while h=`cat < $inpipe`
do
        if [ "$h" = "" ]
        then
                echo "" > $outpipe
                break
        fi
        vi $h
# print the edited file in the window for reference
        cat $h
        echo $h > $outpipe
done