class Thor::Runner

def help(meth=nil)
  if meth && !self.respond_to?(meth)
    initialize_thorfiles(meth)
    klass, task = Thor::Util.namespace_to_thor_class_and_task(meth)
    # Send mapping -h because it works with Thor::Group too
    klass.start(["-h", task].compact, :shell => self.shell)
  else
    super
  end
end