locale filter

gistfile1.rb

###### application_controller.rb
  before_filter :set_locale


  def set_locale
    locale = params[:locale] || cookies[:locale] || TLD_LOCALES[request.host.split('.').last] || request.headers['HTTP_ACCEPT_LANGUAGE'].split(',').map { |l| l.split(';').first } 
    locale = DEFAULT_LOCALE unless (SUPPORTED_LOCALES).include?(locale.to_s)

    I18n.locale = locale.to_s
    cookies[:locale] = locale unless (cookies[:locale] && cookies[:locale] == locale)
  end


###### environment.rb
  DEFAULT_LOCALE = "en"
  LOCALES_DIRECTORY = "#{RAILS_ROOT}/config/locales/"
  locale_files = Dir["#{LOCALES_DIRECTORY}/*.{rb,yml}"]

  SUPPORTED_LOCALES = (locale_files.collect do |locale_file|
    File.basename(File.basename(locale_file, ".rb"), ".yml")
  end + [DEFAULT_LOCALE]).uniq

   TLD_LOCALES = {
   '.ru'  => :ru,
   '.eu'  => :en,
   '.net' => :en
 }