antipope_filter

antipope_filter () {
    local state=0  a b c OIFS="$IFS"

    IFS=
    while read a ; do
        case "$a" in
            Poster:\ * )
                c="$( sed 's/^Poster: *//' <<< "$a" )"
                state=print
                while read b ; do
                    if [ "$c" = "$b" ] ; then
                        state=skip
                        break
                    fi
                done < ~/.killfile-for-antipope
        esac
        if [ $state = print ] ; then echo "$a" ; fi
    done
    IFS="$OIFS"
}