#
# Build differences files '<set>.new' and '<set>.del'
# from current ipset members and the droplist file
#
mk_ip-diffs() {
# $1    ipset name
# $2    path to new droplist file; IPs in column 1
local funtag="[${FUNCNAME[0]}]"
local   this_set=$1
local   dropfile=$2
local   droplist="$POOL/$this_set".droplist
local   currfile="$POOL/$this_set".current
local   newfile="$POOL/$this_set".new
local   delfile="$POOL/$this_set".del

        rm -f $POOL/$this_set.*

        # Keep current members of IPSET in a warm place
        ipset l $this_set | grep '^[1-9]' | awk '{print $1}'| sort -V > $currfile

        # Assure natural IP sort order of droplist as well
	grep '^[1-9]' $dropfile | awk '{print $1}' | sort -V > $droplist

        diff -c $currfile $droplist     |\
        awk     -v newfile=$newfile     \
                -v delfile=$delfile     '
        /^[+][[:space:]]/       { print $2 > newfile }
        /^[-][[:space:]]/       { print $2 > delfile }
        '
}