blob: 3e2b9307a90598a5b4b74af9d29e82bc56358a6e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
#
# 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 magic 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)
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|
descendant.send(:include, klass)
end
end
end
end
end
end
|