lighttroupe/luz

#
# easy_accessor :background_color, :default => []
#
# like attr_accessor but with default values (cached so as to not generate garbage with each call, for complex defaults like rgb colors)
#
# also adds eg. set_background_color(...) method which is chainable.
#
class Module
    def easy_accessor(*signals)
        # easy_accessor :value, :default => 0.5
        if signals.size == 2 && (options = signals.last).is_a?(Hash)
            signal = signals.first
            default = options[:default]
            #puts "def #{signal}() ; @#{signal} || (@#{signal}_default_#{Time.now.to_i} ||= #{default.inspect}) ; end"        # using Time breaks cache on code reload
            module_eval( "def #{signal}() ; @#{signal} || (@#{signal}_default_#{Time.now.to_i} ||= #{default.inspect}) ; end", __FILE__, __LINE__ )
            module_eval( "def #{signal}=(value) @#{signal} = value ; end", __FILE__, __LINE__ )
            module_eval( "def set_#{signal}(value) self.#{signal} = value ; self ; end", __FILE__, __LINE__ )
        else
            # easy_accessor :one, :two, :three
            signals.each { |signal|
                module_eval( "def #{signal}() ; @#{signal} ; end", __FILE__, __LINE__ )
                module_eval( "def #{signal}=(value) @#{signal} = value ; end", __FILE__, __LINE__ )
                module_eval( "def set_#{signal}(value) self.#{signal} = value ; self ; end", __FILE__, __LINE__ )
            }
        end
    end
end