split_namespace

# File railties/lib/rails/command.rb, line 125
        def split_namespace(namespace)
          case namespace
          when /^(.+):(\w+)$/
            [$1, $2]
          when ""
            ["help", "help"]
          when HELP_MAPPINGS, "help"
            ["help", "help_extended"]
          when VERSION_MAPPINGS
            ["version", "version"]
          else
            [namespace, namespace]
          end
        end