?foo=bar</tt>, etc all redirect to <tt>/posts</tt>.
      #
      # The redirect will use a <tt>301 Moved Permanently</tt> status code by
      # default. This can be overridden with the +:status+ option:
      #
      #   get "/stories" => redirect("/posts", status: 307)
      #
      # You can also use interpolation in the supplied redirect argument:
      #
      #   get 'docs/:article', to: redirect('/wiki/%{article}')
      #
      # Note that if you return a path without a leading slash then the URL is prefixed with the
      # current SCRIPT_NAME environment variable. This is typically '/' but may be different in
      # a mounted engine or where the application is deployed to a subdirectory of a website.
      #
      # Alternatively you can use one of the other syntaxes:
      #
      # The block version of redirect allows for the easy encapsulation of any logic associated with
      # the redirect in question. Either the params and request are supplied as arguments, or just
      # params, depending of how many arguments your block accepts. A string is required as a
      # return value.
      #
      #   get 'jokes/:number', to: redirect { |params, request|
      #     path = (params[:number].to_i.even? ? "wheres-the-beef" : "i-love-lamp")
      #     "http://#{request.host_with_port}/#{path}"
      #   }
      #
      # Note that the <tt>do end</tt> syntax for the redirect block wouldn't work, as Ruby would pass
      # the block to +get+ instead of +redirect+. Use <tt>{ ... }</tt> instead.
      #
      # The options version of redirect allows you to supply only the parts of the URL which need
      # to change, it also supports interpolation of the path similar to the first example.
      #
      #   get 'stores/:name',       to: redirect(subdomain: 'stores', path: '/%{name}')
      #   get 'stores/:name(*all)', to: redirect(subdomain: 'stores', path: '/%{name}%{all}')
      #   get '/stories', to: redirect(path: '/posts')
      #
      # This will redirect the user, while changing only the specified parts of the request,
      # for example the +path+ option in the last example.
      # <tt>/stories</tt>, <tt>/stories?foo=bar</tt>, redirect to <tt>/posts</tt> and <tt>/posts?foo=bar</tt> respectively.
      #
      # Finally, an object which responds to call can be supplied to redirect, allowing you to reuse
      # common redirect routes. The call method must accept two arguments, params and request, and return
      # a string.
      #
      #   get 'accounts/:name' => redirect(SubdomainRedirector.new('api'))
      #
      def redirect(*args, &block)
        options = args.extract_options!
        status  = options.delete(:status) || 301
        path    = args.shift

        return OptionRedirect.new(status, options) if options.any?
        return PathRedirect.new(status, path) if String === path

        block = path if path.respond_to? :call
        raise ArgumentError, "redirection argument not supported" unless block
        Redirect.new status, block
      end
    end
  end
end
