gistfile1.rbx

def translate(locale, key, options = {})
  # ...
  entry = lookup(locale, key, scope) || resolve(locale, key, default, options) || raise(I18n::MissingTranslationData.new(locale, key, options))
  # ...
end

def localize(locale, object, format = :default)
  raise ArgumentError, "Object must be a Date, DateTime or Time object. #{object.inspect} given." unless object.respond_to?(:strftime)
  
  if Symbol == format
    type = object.respond_to?(:sec) ? 'time' : 'date'
    format = :"#{type}.formats.#{format}"
  end
  
  format = resolve locale, object, format, :raise => true
  
  format.gsub!(/%a/, translate(locale, :"date.abbr_day_names")[object.wday])
  format.gsub!(/%A/, translate(locale, :"date.day_names")[object.wday])
  format.gsub!(/%b/, translate(locale, :"date.abbr_month_names")[object.mon])
  format.gsub!(/%B/, translate(locale, :"date.month_names")[object.mon])
  format.gsub!(/%p/, translate(locale, :"time.#{object.hour < 12 ? :am : :pm}")) if object.respond_to? :hour
  
  object.strftime(format)
end

# rename #default to #resolve
def resolve(locale, object, subject, options = {})
  case subject
    when String then subject
    when Symbol then translate locale, subject, options
    when Proc   then subject.call object
    when Array  then subject.each do |subject|
      result = resolve(locale, object, subject, options.dup) and return result
    end
  end
rescue MissingTranslationData => e
  raise e if options[:raise]
end