POSTIN

/bin/sh

if [ "$1" = 1 ] ; then
   [ ! -f /usr/share/timidity/timidity.cfg ] && touch /usr/share/timidity/timidity.cfg
   cat /usr/share/timidity/timidity.cfg | grep "dir /usr/share/timidity" || echo "dir /usr/share/timidity" >> /usr/share/timidity/timidity.cfg
   cat /usr/share/timidity/timidity.cfg | grep "source midia.cfg" || echo "source midia.cfg" >> /usr/share/timidity/timidity.cfg
fi

POSTUN

/bin/sh

if [ "$1" = 0 ] ; then
   if [ -f /usr/share/timidity/timidity.cfg ];then
   perl -pi -e 's#^dir /usr/share/timidity##; s#^source midia.cfg##;' /usr/share/timidity/timidity.cfg
   fi
fi