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#
# Copyright:: Copyright 2011-2019, Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
class Chef
module Mixin
# If you have:
#
# module A
# extend LazyModuleInclude
# end
#
# module B
# include A
# end
#
# module C
# include B
# end
#
# module Monkeypatches
# def monkey
# puts "monkey!"
# end
# end
#
# A.send(:include, Monkeypatches)
#
# Then B and C and any classes that they're included in will also get the #monkey method patched into them.
#
module LazyModuleInclude
# Most of the magick is in this hook which creates a closure over the parent class and then builds an
# "infector" module which infects all descendants and which is responsible for updating the list of
# descendants in the parent class.
def included(klass)
super
parent_klass = self
infector = Module.new do
define_method(:included) do |subklass|
super(subklass)
puts "infecting #{subclass}"
subklass.extend(infector)
parent_klass.descendants.push(subklass)
end
end
klass.extend(infector)
parent_klass.descendants.push(klass)
end
def descendants
@descendants ||= []
end
def include(*classes)
super
classes.each do |klass|
descendants.each do |descendant|
puts "recursively including #{klass} into #{descendant}"
descendant.send(:include, klass)
end
end
end
end
end
end
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