Something

on *:ban:*:{
 if ($ialchan($banmask,$chan,0)) {
   var %i = $v1,%r
   while (%i) {
     %r = %r $nick($chan,$ialchan($banmask,$chan,%i).nick).pnick
     if ($len(%r) > 500) {
       %r = %r $+ ...
       break
     }
     dec %i
   }
   echo -t $chan This ban affects: $tbr($replace(%r,$chr(32),$chr(44) $+ $chr(32)))
 }
}