class Thor::Group

def _invoke_for_class_method(klass, command=nil, *args, &block) #:nodoc:

:nodoc:
invoke and invoke_from_option class methods.
Shortcut to invoke with padding and block handling. Use internally by 
def _invoke_for_class_method(klass, command=nil, *args, &block) #:nodoc:
  with_padding do
    if block
      case block.arity
      when 3
        block.call(self, klass, command)
      when 2
        block.call(self, klass)
      when 1
        instance_exec(klass, &block)
      end
    else
      invoke klass, command, *args
    end
  end
end