Make module dependency DSL opt in

3 files changed, 24 insertions, 27 deletions

diff --git a/activesupport/lib/active_support/core_ext/module.rb b/activesupport/lib/active_support/core_ext/module.rb
index fee91534e7..215c47b114 100644
--- a/activesupport/lib/active_support/core_ext/module.rb
+++ b/activesupport/lib/active_support/core_ext/module.rb
@@ -9,4 +9,3 @@ require 'active_support/core_ext/module/delegation'
 require 'active_support/core_ext/module/loading'
 require 'active_support/core_ext/module/model_naming'
 require 'active_support/core_ext/module/synchronization'
-require 'active_support/core_ext/module/setup'
diff --git a/activesupport/lib/active_support/core_ext/module/setup.rb b/activesupport/lib/active_support/core_ext/module/setup.rb
deleted file mode 100644
index e6dfd0cf56..0000000000
--- a/activesupport/lib/active_support/core_ext/module/setup.rb
+++ /dev/null
@@ -1,26 +0,0 @@
-class Module
-  attr_accessor :_setup_block
-  attr_accessor :_dependencies
-  
-  def setup(&blk)
-    @_setup_block = blk
-  end
-  
-  def use(mod)
-    return if self < mod
-    
-    (mod._dependencies || []).each do |dep|
-      use dep
-    end
-    # raise "Circular dependencies" if self < mod
-    include mod
-    extend mod.const_get("ClassMethods") if mod.const_defined?("ClassMethods")
-    class_eval(&mod._setup_block) if mod._setup_block
-  end
-  
-  def depends_on(mod)
-    return if self < mod
-    @_dependencies ||= []
-    @_dependencies << mod
-  end
-end
\ No newline at end of file
diff --git a/activesupport/lib/active_support/dependency_module.rb b/activesupport/lib/active_support/dependency_module.rb
new file mode 100644
index 0000000000..0e1cc67b53
--- /dev/null
+++ b/activesupport/lib/active_support/dependency_module.rb
@@ -0,0 +1,24 @@
+module ActiveSupport
+  module DependencyModule
+    def setup(&blk)
+      @_setup_block = blk
+    end
+
+    def append_features(base)
+      return if base < self
+      (@_dependencies ||= []).each { |dep| base.send(:include, dep) }
+      super
+    end
+
+    def included(base)
+      base.extend const_get("ClassMethods") if const_defined?("ClassMethods")
+      base.class_eval(&@_setup_block) if instance_variable_defined?("@_setup_block")
+    end
+
+    def depends_on(mod)
+      return if self < mod
+      @_dependencies ||= []
+      @_dependencies << mod
+    end
+  end
+end