def generate_dir(dest)
      return if @generated_dirs.has_key?(dest)

      path = interpolate(dest)
      empty_directory path

      @generated_dirs[dest] = path
      return path
    end
def generate_dir(dest)
      return if @generated_dirs.has_key?(dest)

      path = interpolate(dest)
      empty_directory path

      @generated_dirs[dest] = path
      return path
    end
Generates an empty directory.

 @param [String] dest
   The uninterpolated destination path.

 @return [String]
   The destination path of the directory.

 @since 0.7.1