RubyEncodingMarker - скрипт, занимающийся вставкой информации о кодировке файла необходимой для корректной работы Ruby 1.9. Полезен при переходе со старой версии Ruby.

ruby_encoding_marker.rb

# -*- encoding: utf-8 -*-

# file name: ruby_encoding_marker.rb
#
# @example Use in console:
#   $ ruby ruby_encoding_marker.rb app/controllers
#

module RubyEncodingMarker
  UTF8 = '# -*- encoding: utf-8 -*-'

  class << self
    # @param [String] Путь до файла или директории
    #
    def mark_as_utf8(path)
      mark_dir_or_file(path, UTF8)
    end

    private

    def mark_dir_or_file(path, encoding_comment)
      if Dir.exists?(path)
        mark_dir(path, UTF8)
      elsif File.exists?(path)
        mark_file(path, UTF8)
      else
        raise "Path: #{path} not detected as directory or file"
      end
    end

    # @note Работает рекурсия
    #
    def mark_dir(path, encoding_comment)
      Dir.foreach(path) do |filename|
        next if filename == '.' || filename == '..'

        file_path = File.join(path, filename)
        if Dir.exists?(file_path)
          mark_dir(file_path, encoding_comment)
        elsif File.exists?(file_path)
          mark_file(file_path, encoding_comment)
        else
          raise "Path: #{file_path} not detected as directory or file"
        end
      end
    end

    def mark_file(file_path, encoding_comment)
      current_file_content = File.read(file_path)
      new_file_content = [encoding_comment, current_file_content].join("\n\n")

      File.write(file_path, new_file_content, :mode => 'w')
    end

  end  # class << self

end


def main(path)
  RubyEncodingMarker.mark_as_utf8(path)
end


## Begin

path = ARGV[0]

main(path)