 
     IO.inspect( draw_payload )
 
-    Enum.each( clients, fn({pid, nick}) ->
+    Enum.each( clients, fn({pid, _nick}) ->
       send pid, make_packet( "draw", draw_payload )
     end )
   end


  def handle_call( :list_clients, _from, clients ) do
    { :reply, clients, clients }
  end

  def handle_call( :get_nick, from, clients ) do
    { :reply, client_for_pid(clients, from), clients }
  end

  def handle_cast( { :add_client, { pid, nick } }, clients ) do

    this is sent to everyone
  """
  defp broadcast_pen_up( clients, source_pid ) do
    Enum.each( clients, fn({pid, _nick}) ->
      send pid, make_packet( "pen_up", [ userId: inspect(source_pid) ] )
    end )
  end
