module Usable class ModExtender SPEC = :UsableSpec CLASS_MODULE = :ClassMethods attr_reader :name attr_accessor :copy, :mod, :options, :unwanted def initialize(mod, options = {}) @mod = mod @options = options @options[:method] ||= :include if has_spec? @copy = mod.const_get SPEC @name = "#{mod.name}UsableSpec" else @copy = mod @name = mod.name end @unwanted = options[:only] ? @copy.instance_methods - Array(options[:only]) : [] if @unwanted.any? @copy = @copy.dup end end # @note Destructive, as it changes @copy def override unwanted.each do |method_name| copy.send :remove_method, method_name end end # @description Directly include a module whose methods you want made available in +usable_config.available_methods+ # Gives the module a name when including so that it shows up properly in the list of ancestors def use!(target) override if copy.name.nil? const_name = "#{mod_name}Used" target.send :remove_const, const_name if target.const_defined? const_name, false target.const_set const_name, copy end target.usable_config.modules << copy target.send options[:method], copy end # @description Includes or prepends the original module onto the target def use_original!(target) return unless has_spec? target.usable_config.modules << mod target.send options[:method], mod end # @description Extends the target with the module's ClassMethod mod def use_class_methods!(target) return unless mod.const_defined? CLASS_MODULE target.extend mod.const_get CLASS_MODULE end def has_spec? mod.const_defined? SPEC end def mod_name if name name.split('::').last else "UsableMod#{Time.now.strftime('%s')}" end end end end