1 files changed, 103 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/view_load_paths.rb b/actionpack/lib/action_view/view_load_paths.rb
new file mode 100644
index 0000000000..e873d96aa0
--- /dev/null
+++ b/actionpack/lib/action_view/view_load_paths.rb
@@ -0,0 +1,103 @@
+module ActionView #:nodoc:
+  class ViewLoadPaths < Array #:nodoc:
+    def self.type_cast(obj)
+      obj.is_a?(String) ? LoadPath.new(obj) : obj
+    end
+
+    class LoadPath #:nodoc:
+      attr_reader :path, :paths
+      delegate :to_s, :inspect, :to => :path
+
+      def initialize(path)
+        @path = path.freeze
+        reload!
+      end
+
+      def eql?(view_path)
+        view_path.is_a?(ViewPath) && @path == view_path.path
+      end
+
+      def hash
+        @path.hash
+      end
+
+      # Rebuild load path directory cache
+      def reload!
+        @paths = {}
+
+        files.each do |file|
+          @paths[file.path] = file
+          @paths[file.path_without_extension] ||= file
+        end
+
+        @paths.freeze
+      end
+
+      # Tries to find the extension for the template name.
+      # If it does not it exist, tries again without the format extension
+      #   find_template_file_for_partial_path('users/show') => 'html.erb'
+      #   find_template_file_for_partial_path('users/legacy') => 'rhtml'
+      def find_template_file_for_partial_path(file)
+        @paths[file.path] || @paths[file.path_without_extension] || @paths[file.path_without_format_and_extension]
+      end
+
+      private
+        # Get all the files and directories in the path
+        def files_in_path
+          Dir.glob("#{@path}/**/*/**") | Dir.glob("#{@path}/**")
+        end
+
+        # Create an array of all the files within the path
+        def files
+          files_in_path.map do |file|
+            TemplateFile.from_full_path(@path, file) unless File.directory?(file)
+          end.compact
+        end
+    end
+
+    def initialize(*args)
+      super(*args).map! { |obj| self.class.type_cast(obj) }
+    end
+
+    def reload!
+      each { |path| path.reload! }
+    end
+
+    def <<(obj)
+      super(self.class.type_cast(obj))
+    end
+
+    def push(*objs)
+      delete_paths!(objs)
+      super(*objs.map { |obj| self.class.type_cast(obj) })
+    end
+
+    def unshift(*objs)
+      delete_paths!(objs)
+      super(*objs.map { |obj| self.class.type_cast(obj) })
+    end
+
+    def template_exists?(file)
+      find_load_path_for_path(file) ? true : false
+    end
+
+    def find_load_path_for_path(file)
+      find { |path| path.paths[file.to_s] }
+    end
+
+    def find_template_file_for_path(file)
+      file = TemplateFile.from_path(file)
+      each do |path|
+        if f = path.find_template_file_for_partial_path(file)
+          return f
+        end
+      end
+      nil
+    end
+
+    private
+      def delete_paths!(paths)
+        paths.each { |p1| delete_if { |p2| p1.to_s == p2.to_s } }
+      end
+  end
+end