module NavigationHelpers
  def path_to(page_name)
    case page_name
    when "the new album page"
      '/albums/new'
    when /^the image for text "(.+)", size "(.+)"$/
      "/text/#{$1}/#{$2}"
    else
      raise "Can't find mapping from \"#{page_name}\" to a path.\n" +
        "Now, go and add a mapping in #{__FILE__}"
    end
  end
end

World(NavigationHelpers)