invoke

# File railties/lib/rails/generators.rb, line 272
      def invoke(namespace, args = ARGV, config = {})
        names = namespace.to_s.split(":")
        if klass = find_by_namespace(names.pop, names.any? && names.join(":"))
          args << "--help" if args.empty? && klass.arguments.any?(&:required?)
          klass.start(args, config)
        else
          options     = sorted_groups.flat_map(&:last)
          suggestion  = Rails::Command::Spellchecker.suggest(namespace.to_s, from: options)
          suggestion_msg = "Maybe you meant #{suggestion.inspect}?" if suggestion

          puts <<~MSG
            Could not find generator '#{namespace}'. #{suggestion_msg}
            Run `rails generate --help` for more options.
          MSG
        end
      end

      private

        def print_list(base, namespaces) # :doc:
          namespaces = namespaces.reject { |n| hidden_namespaces.include?(n) }
          super
        end

        # Try fallbacks for the given base.
        def invoke_fallbacks_for(name, base)
          return nil unless base && fallbacks[base.to_sym]
          invoked_fallbacks = []

          Array(fallbacks[base.to_sym]).each do |fallback|
            next if invoked_fallbacks.include?(fallback)
            invoked_fallbacks << fallback

            klass = find_by_namespace(name, fallback)
            return klass if klass
          end

          nil
        end

        def command_type # :doc:
          @command_type ||= "generator"
        end

        def lookup_paths # :doc:
          @lookup_paths ||= %( rails/generators generators )
        end

        def file_lookup_paths # :doc:
          @file_lookup_paths ||= [ "{#{lookup_paths.join(',')}}", "**", "*_generator.rb" ]
        end
    end