Revert "Auto-load template handlers based on unmatched extensions [#1540 state:resolved]"

This reverts commit e8c1915416579a3840573ca2c80822d96cb31823.

Reasons :
- ActionPack tests run very slow
- Gem.searcher hanging for long time when extension is nil

1 files changed, 1 insertions, 24 deletions

diff --git a/actionpack/lib/action_view/template_handlers.rb b/actionpack/lib/action_view/template_handlers.rb
index c50a51b0d1..d06ddd5fb5 100644
--- a/actionpack/lib/action_view/template_handlers.rb
+++ b/actionpack/lib/action_view/template_handlers.rb
@@ -28,10 +28,6 @@ module ActionView #:nodoc:
       @@template_handlers[extension.to_sym] = klass
     end
 
-    def valid_extension?(extension)
-      template_handler_extensions.include?(extension) || init_path_for_extension(extension)
-    end
-
     def template_handler_extensions
       @@template_handlers.keys.map(&:to_s).sort
     end
@@ -42,26 +38,7 @@ module ActionView #:nodoc:
     end
 
     def handler_class_for_extension(extension)
-      (extension && @@template_handlers[extension.to_sym] || autoload_handler_class(extension)) ||
-        @@default_template_handlers
+      (extension && @@template_handlers[extension.to_sym]) || @@default_template_handlers
     end
-
-    private
-      def autoload_handler_class(extension)
-        return if Gem.loaded_specs[extension]
-        return unless init_path = init_path_for_extension(extension)
-        Gem.activate(extension)
-        load(init_path)
-        handler_class_for_extension(extension)
-      end
-
-      # Returns the path to the rails/init.rb file for the given extension,
-      # or nil if no gem provides it.
-      def init_path_for_extension(extension)
-        return unless spec = Gem.searcher.find(extension.to_s)
-        returning File.join(spec.full_gem_path, 'rails', 'init.rb') do |path|
-          return unless File.file?(path)
-        end
-      end
   end
 end