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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
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