Permalinks mit Umlauten

gistfile1.rbx

ActionController::Base.logger.info "[Base] Loading config/initializers/" + File.basename(__FILE__)
class String
  def to_permalink
    text = self.dup
    
    replacements = { 
      # replacement         special character(s) to be replaced
      "A" =>                [ "À", "Á", "Â", "Ã", "Å"],
      "Ae" =>               [ "Ä", "Æ" ],
      "C" =>                [ "Ç" ],
      "D" =>                [ "Ð" ],
      "E" =>                [ "È", "É", "Ê", "Ë" ],
      "I" =>                [ "Ì", "Í", "Î", "Ï" ],
      "N" =>                [ "Ñ" ],
      "O" =>                [ "Ò", "Ó", "Ô", "Õ", "Ø" ],
      "Oe" =>               [ "Ö" ],
      "U" =>                [ "Ù", "Ú", "Û" ],
      "Ue" =>               [ "Ü" ],
      "Y" =>                [ "Ý" ],
      
      "p" =>                [ "Þ"],
      "a" =>                [ "à", "á", "â", "ã", "å" ],
      "ae" =>               [ "ä", "æ" ],
      "c" =>                [ "ç" ],
      "d" =>                [ "ð" ],
      "e" =>                [ "è", "é", "ê", "ë" ],
      "i" =>                [ "ì", "í", "î", "ï" ],
      "n" =>                [ "ñ" ],
      "o" =>                [ "ò", "ó", "ô", "õ", "ø" ],
      "oe" =>               [ "ö" ],
      "ss" =>               [ "ß" ],
      "u" =>                [ "ù", "ú", "û" ],
      "ue" =>               [ "ü" ],
      "y" =>                [ "ý" ]
    }
    
    replacements.each_pair do |replacement, search_chars|
      search_chars.each do |ch|
        text.gsub!(ch, replacement)
      end
    end
    
    text.gsub!(/([^\-\.A-Za-z0-9_])/, "-") # replace all special chars with hyphens
    text.gsub!(/([\-.][\-.]+)/, "-") # replace multiple hyphens with single hyphen
    text.gsub!(/(^[\-.]|[\-.]$)/, "") # remove leading and trailing hyphen
    
    text
  end
end