From 8ff44631939fd9220f03f9b18a687cbd040220e3 Mon Sep 17 00:00:00 2001
From: Nicholas Seckar <nseckar@gmail.com>
Date: Mon, 13 Mar 2006 15:54:33 +0000
Subject: Simplify controller_path Cache File.directory? calls to avoid
 filesystem calls when using layouts

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3861 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
---
 actionpack/CHANGELOG                       |  4 ++++
 actionpack/lib/action_controller/base.rb   |  8 +-------
 actionpack/lib/action_controller/layout.rb | 25 ++++++++++++++++++++++---
 3 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/actionpack/CHANGELOG b/actionpack/CHANGELOG
index aa1ddd1a08..8beff49f54 100644
--- a/actionpack/CHANGELOG
+++ b/actionpack/CHANGELOG
@@ -1,5 +1,9 @@
 *SVN*
 
+* Avoid hitting the filesystem when using layouts by using a File.directory? cache. [Stefan Kaes, Nicholas Seckar]
+
+* Simplify ActionController::Base#controller_path [Nicholas Seckar]
+
 * Added simple alert() notifications for RJS exceptions when config.action_view.debug_rjs = true. [Sam Stephenson]
 
 * Added :content_type option to render, so you can change the content type on the fly [DHH]. Example: render :action => "atom.rxml", :content_type => "application/atom+xml"
diff --git a/actionpack/lib/action_controller/base.rb b/actionpack/lib/action_controller/base.rb
index bcfea86ac4..afb17d7655 100755
--- a/actionpack/lib/action_controller/base.rb
+++ b/actionpack/lib/action_controller/base.rb
@@ -348,13 +348,7 @@ module ActionController #:nodoc:
       
       # Converts the class name from something like "OneModule::TwoModule::NeatController" to "one_module/two_module/neat".
       def controller_path
-        unless @controller_path
-          components = self.name.to_s.split('::')
-          components[-1] = $1 if /^(.*)Controller$/ =~ components.last
-          @controller_path = components.map { |name| name.underscore }.join('/')
-        end
-
-        @controller_path
+        @controller_path ||= name.gsub(/Controller$/, '').underscore
       end
 
       # Return an array containing the names of public methods that have been marked hidden from the action processor.
diff --git a/actionpack/lib/action_controller/layout.rb b/actionpack/lib/action_controller/layout.rb
index 66438d277e..fdee677bbb 100644
--- a/actionpack/lib/action_controller/layout.rb
+++ b/actionpack/lib/action_controller/layout.rb
@@ -192,6 +192,12 @@ module ActionController #:nodoc:
         def normalize_conditions(conditions)
           conditions.inject({}) {|hash, (key, value)| hash.merge(key => [value].flatten.map {|action| action.to_s})}
         end
+        
+        def layout_directory_exists_cache
+          @@layout_directory_exists_cache ||= Hash.new do |h, dirname|
+            h[dirname] = File.directory? dirname
+          end
+        end
     end
 
     # Returns the name of the active layout. If the layout was specified as a method reference (through a symbol), this method
@@ -202,16 +208,21 @@ module ActionController #:nodoc:
       layout = passed_layout || self.class.read_inheritable_attribute("layout")
 
       active_layout = case layout
+        when String then layout
         when Symbol then send(layout)
         when Proc   then layout.call(self)
-        when String then layout
       end
       
       # Explicitly passed layout names with slashes are looked up relative to the template root,
       # but auto-discovered layouts derived from a nested controller will contain a slash, though be relative
       # to the 'layouts' directory so we have to check the file system to infer which case the layout name came from.
-      nested_controller = File.directory?(File.dirname(File.join(self.class.template_root, 'layouts', active_layout))) if active_layout
-      active_layout.include?('/') && !nested_controller ? active_layout : "layouts/#{active_layout}" if active_layout
+      if active_layout
+        if active_layout.include?('/') && ! layout_directory?(active_layout)
+          active_layout
+        else
+          "layouts/#{active_layout}"
+        end
+      end
     end
 
     def render_with_a_layout(options = nil, deprecated_status = nil, deprecated_layout = nil, &block) #:nodoc:
@@ -280,5 +291,13 @@ module ActionController #:nodoc:
           true
         end
       end
+      
+      # Does a layout directory for this class exist?
+      # we cache this info in a class level hash
+      def layout_directory?(layout_name)
+        template_path = File.join(self.class.view_root, 'layouts', layout_name)
+        dirname = File.dirname(template_path)
+        self.class.send(:layout_directory_exists_cache)[dirname]
+      end
   end
 end
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