gistfile1.rb

###

if options[:validate_password_field]
  validates_length_of options[:password_field], {:minimum => 4, :if => "validate_#{options[:password_field]}?".to_sym}.merge(options[:password_field_validates_length_of_options])
  validates_confirmation_of options[:password_field], options[:password_field_validates_confirmation_of_options].merge(:if => "#{options[:password_salt_field]}_changed?".to_sym)
  validates_presence_of "#{options[:password_field]}_confirmation", :if => "#{options[:password_salt_field]}_changed?".to_sym
end

###

class_eval <<-"end eval", __FILE__, __LINE__

  # etc

  def validate_#{options[:password_field]}?
    self.#{options[:crypted_password_field]}.blank?
  end
  
  # etc

end_eval