module Rails module Generator # A spec knows where a generator was found and how to instantiate it. # Metadata include the generator's name, its base path, and the source # which yielded it (PathSource, GemSource, etc.) class Spec attr_reader :name, :path, :source def initialize(name, path, source) @name, @path, @source = name, path, source end # Look up the generator class. Require its class file, find the class # in ObjectSpace, tag it with this spec, and return. def klass unless @klass require class_file @klass = lookup_class @klass.spec = self end @klass end def class_file "#{path}/#{name}_generator.rb" end def class_name "#{name.camelize}Generator" end private # Search for the first Class descending from Rails::Generator::Base # whose name matches the requested class name. def lookup_class ObjectSpace.each_object(Class) do |obj| return obj if obj.ancestors.include?(Rails::Generator::Base) and obj.name.split('::').last == class_name end raise NameError, "Missing #{class_name} class in #{class_file}" end end end end