class Thor::Group

def invoke(*names, &block)


usage. Check invoke_from_option for more information.
The namespace/class given will have its options showed on the help

configure how it will be invoked.
method that will invoke the klass and task. You can give a block to
Invoke the given namespace or class given. It adds an instance 
def invoke(*names, &block)
  options = names.last.is_a?(Hash) ? names.pop : {}
  verbose = options.fetch(:verbose, true)
  names.each do |name|
    invocations[name] = false
    invocation_blocks[name] = block if block_given?
    class_eval <<-METHOD, __FILE__, __LINE__
      def _invoke_#{name.to_s.gsub(/\W/, '_')}
        klass, task = self.class.prepare_for_invocation(nil, #{name.inspect})
        if klass
          say_status :invoke, #{name.inspect}, #{verbose.inspect}
          block = self.class.invocation_blocks[#{name.inspect}]
          _invoke_for_class_method klass, task, &block
        else
          say_status :error, %(#{name.inspect} [not found]), :red
        end
      end
    METHOD
  end
end