Module: TcravitRubyLib::Configurable
- Defined in:
- lib/tcravit_ruby_lib/configurable.rb
Overview
Make a class configurable via a DSL
From www.toptal.com/ruby/ruby-dsl-metaprogramming-guide
Sample Usage:
class MyApp
include Configurable.with(:app_id, :title, :cookie_name)
# ...
end
SomeClass.configure do
app_id "my_app"
title "My App"
{ "#{app_id}_session" }
end
Class Method Summary collapse
-
.with(*attrs) ⇒ Object
nodoc
.
Class Method Details
.with(*attrs) ⇒ Object
nodoc
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# File 'lib/tcravit_ruby_lib/configurable.rb', line 45 def self.with(*attrs) not_provided = Object.new config_class = Class.new do attrs.each do |attr| define_method attr do |value = not_provided, &block| if value === not_provided && block.nil? result = instance_variable_get("@#{attr}") result.is_a?(Proc) ? instance_eval(&result) : result else instance_variable_set("@#{attr}", block || value) end end end attr_writer *attrs end class_methods = Module.new do define_method :config do @config ||= config_class.new end def configure(&block) config.instance_eval(&block) end end Module.new do singleton_class.send :define_method, :included do |host_class| host_class.extend class_methods end end end |