require 'stringex'
require 'digest/md5'

class String
  def filename_to_slug
    s = self.to_url
    if s.blank?
      return Digest::MD5.hexdigest(self)
    end
    s
  end
end
#
# module FilenameToSlug
#   extend ActiveSupport::Concern
#   included do
#     before_post_process :filename_to_slug
#   end
#
#   def filename_to_slug
#     if self.class.attachment_definitions
#       self.class.attachment_definitions.each do |k,v|
#         if self.send(k).file?
#           full_file_name = self.send("#{k}_file_name")
#           extension = File.extname(full_file_name)[1..-1]
#           file_name = full_file_name[0..full_file_name.size-extension.size-1]
#           self.send("#{k}").instance_write(:file_name, "#{file_name.filename_to_slug}.#{extension.filename_to_slug}")
#         end
#       end
#     end
#   end
# end