downcase with accents for latin1 (sort of)

gistfile1.txt

# -*- coding: utf-8 -*-
class String
  def downcase_with_accents
     return nil if s.nil?
     norm = self.downcase
     norm.tr!('ÁÉÍÓÚÇ', 'aeiouç')
     norm.tr!('ÀÈÌÒÙ', 'aeiou')
     norm.tr!('ÄËÏÖÜ', 'aeiou')
     norm.tr!('ÂÊÎÔÛ', 'aeiou')
     norm.tr!('áéíóú', 'aeiou')
     norm.tr!('àèìòù', 'aeiou')
     norm.tr!('äëïöü', 'aeiou')
     norm.tr!('âêîôû', 'aeiou')
     norm
   end    mapping = {
      'Á' => 'á',
      'É' => 'é',
      'Í' => 'í',
      'Ó' => 'ó',
      'Ú' => 'ú',
      'À' => 'à',
      'Â' => 'â',
      'Ê' => 'ê',
      'Ô' => 'ô',
      'Ã' => 'ã',
      'Õ' => 'õ',
      'Ç' => 'ç'
    }

    mapping.inject(self.downcase_without_accents) { |str, m|
      str.tr(m[0], m[1])
    }
  end

  alias :downcase_without_accents :downcase
  alias :downcase :downcase_with_accents

  def capitalize_with_accents
    self[0..0] + self[1..-1].downcase
  end

  alias :capitalize_without_accents :capitalize
  alias :capitalize :capitalize_with_accents
end