--- /dev/null
+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, GemPathSource, 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