module NavigationHelpers
  def path_to(page_name)
    case page_name
      when /^the home\s?page$/
        '/'
      when /^the track page for "([^\"]*)"$/
        track_path Track.find_by_name($1)
      else
        begin
          page_name =~ /^the (.*) page$/
          path_components = $1.split(/\s+/)
          self.send(path_components.push('path').join('_').to_sym)
        rescue NoMethodError, ArgumentError
          raise "Can't find mapping from \"#{page_name}\" to a path.\n" +
            "Now, go and add a mapping in #{__FILE__}"
        end
    end
  end
end

World(NavigationHelpers)