Start adding configuration to ActionView instead of using constants.

  By using config rather than hardcoded constants, we can evolve the
  configuration system over time (we'd just need to update the config
  method with more robust capabilities and all consumers would get
  the capabilities with no code changes)

2 files changed, 37 insertions, 0 deletions

diff --git a/activesupport/lib/active_support/autoload.rb b/activesupport/lib/active_support/autoload.rb
index 47a17687bf..f3a68b482f 100644
--- a/activesupport/lib/active_support/autoload.rb
+++ b/activesupport/lib/active_support/autoload.rb
@@ -7,6 +7,8 @@ module ActiveSupport
   autoload :Callbacks, 'active_support/callbacks'
   autoload :Concern, 'active_support/concern'
   autoload :ConcurrentHash, 'active_support/concurrent_hash'
+  autoload :Configurable, 'active_support/configurable'
+  autoload :DependencyModule, 'active_support/dependency_module'
   autoload :DeprecatedCallbacks, 'active_support/deprecated_callbacks'
   autoload :Deprecation, 'active_support/deprecation'
   autoload :Gzip, 'active_support/gzip'
diff --git a/activesupport/lib/active_support/configurable.rb b/activesupport/lib/active_support/configurable.rb
new file mode 100644
index 0000000000..890f465ce1
--- /dev/null
+++ b/activesupport/lib/active_support/configurable.rb
@@ -0,0 +1,35 @@
+require "active_support/concern"
+
+module ActiveSupport
+  module Configurable
+    extend ActiveSupport::Concern
+
+    module ClassMethods
+      def get_config
+        module_parts = name.split("::")
+        modules = [Object]
+        module_parts.each {|name| modules.push modules.last.const_get(name) }
+        modules.reverse_each do |mod|
+          return mod.const_get(:DEFAULT_CONFIG) if const_defined?(:DEFAULT_CONFIG)
+        end
+        {}
+      end
+      
+      def config
+        self.config = get_config unless @config
+        @config
+      end
+
+      def config=(hash)
+        @config = ActiveSupport::OrderedOptions.new
+        hash.each do |key, value|
+          @config[key] = value
+        end
+      end
+    end
+
+    def config
+      self.class.config
+    end
+  end
+end
\ No newline at end of file