module Spruz::Full

foo.full?(&:bar) in the previous block form.
given by dispatch is called on the object. This is the same as
argument +dispatch+ was given and the object wasn't blank the method
blank, the block is executed with the object as its first argument. If an
returns nil. If a block was given as an argument and the object isn't
Returns the object if it isn't blank (as in Object#blank?), otherwise it

def full?(dispatch = nil, *args)
  if blank?
    obj = nil
  #elsif Module === dispatch # TODO
  #  dispatch.found?(self)
  elsif dispatch
    obj = __send__(dispatch, *args)
    obj = nil if obj.blank?
  else
    obj = self
  end
  if block_given? and obj
    yield obj
  else
    obj
  end
end