#!/bin/sh
filename=`basename $1`

if [ ! -d "$filename" ] ; then
    echo Sorry, $filename is not a directory.
    exit
fi

tar -cvzf "$filename.tar.gz" "$filename"

if [ $? -gt 0 ] ; then
    echo Something bad happened while tarring directory.  Exiting.
    exit
fi

echo
echo Calculating space savings...
typeset -i original=`du -sk "$filename" |cut -f 1`
typeset -i packed=`du -sk "$filename".tar.gz |cut -f 1`
typeset -i delta=original-packed
percent=`echo "scale=1;$packed * 100 / $original" |bc`
echo Packed "$original"KB into "$packed"KB\; saved "$delta"KB\; tarball is $percent% original size.

echo
echo -n "Do you want to remove the directory? [y/N]: "
read answer
if [ $answer == "y" ] ; then
    rm -fr "$filename"
fi