Nameize Ruby

nameize.rb

class String
  SPACE = ' '
  APOS = "'"

  def nameize
    case self
    when / /
      downcase.split(SPACE).each { |part| part.nameize! }.join(SPACE)
    when /^(mac|mc)(\w)(.*)$/i
      "#{$1.capitalize}#{$2.capitalize}#{$3}"
    when /\'/
      downcase.split(APOS).each{ |piece| piece.capitalize! }.join(APOS)
    else
      downcase.capitalize
    end
  end

  def nameize!
  replace nameize
  end

end

puts "COLYN O'REILLY".nameize

Ok