module Utils::IRB::Shell

def receiver_unless_main(method, &block)

Returns:

(String, nil) - the receiver name if it is not 'main', otherwise nil

Parameters:

block (Proc) -- an optional block to execute with the receiver name
method (Method) -- the method object to inspect

def receiver_unless_main(method, &block)
  receiver_name = method.receiver.to_s
  if receiver_name != 'main'
    if block
      block.(receiver_name)
    else
      receiver_name
    end
  end
end