Reduce Jekyll::Renderer instances during a build

lib/jekyll/convertible.rb

@@ -78,23 +78,23 @@ def validate_permalink!(filename)
     #
     # Returns the transformed contents.
     def transform
-      _renderer.convert(content)
+      renderer.convert(content)
     end
 
     # Determine the extension depending on content_type.
     #
     # Returns the String extension for the output file.
     #   e.g. ".html" for an HTML output file.
     def output_ext
-      _renderer.output_ext
+      renderer.output_ext
     end
 
     # Determine which converter to use based on this convertible's
     # extension.
     #
     # Returns the Converter instance.
     def converters
-      _renderer.converters
+      renderer.converters
     end
 
     # Render Liquid in the content
@@ -105,7 +105,7 @@ def converters
     #
     # Returns the converted content
     def render_liquid(content, payload, info, path)
-      _renderer.render_liquid(content, payload, info, path)
+      renderer.render_liquid(content, payload, info, path)
     end
 
     # Convert this Convertible's data to a Hash suitable for use by Liquid.
@@ -191,10 +191,10 @@ def invalid_layout?(layout)
     #
     # Returns nothing
     def render_all_layouts(layouts, payload, info)
-      _renderer.layouts = layouts
-      self.output = _renderer.place_in_layouts(output, payload, info)
+      renderer.layouts = layouts
+      self.output = renderer.place_in_layouts(output, payload, info)
     ensure
-      @_renderer = nil # this will allow the modifications above to disappear
+      @renderer = nil # this will allow the modifications above to disappear
     end
 
     # Add any necessary layouts to this convertible document.
@@ -204,15 +204,15 @@ def render_all_layouts(layouts, payload, info)
     #
     # Returns nothing.
     def do_layout(payload, layouts)
-      self.output = _renderer.tap do |renderer|
-        renderer.layouts = layouts
-        renderer.payload = payload
+      self.output = renderer.tap do |doc_renderer|
+        doc_renderer.layouts = layouts
+        doc_renderer.payload = payload
       end.run
 
       Jekyll.logger.debug "Post-Render Hooks:", relative_path
       Jekyll::Hooks.trigger hook_owner, :post_render, self
     ensure
-      @_renderer = nil # this will allow the modifications above to disappear
+      @renderer = nil # this will allow the modifications above to disappear
     end
 
     # Write the generated page file to the destination directory.
@@ -241,12 +241,12 @@ def [](property)
       end
     end
 
-    private
-
-    def _renderer
-      @_renderer ||= Jekyll::Renderer.new(site, self)
+    def renderer
+      @renderer ||= Jekyll::Renderer.new(site, self)
     end
 
+    private
+
     def no_layout?
       data["layout"] == "none"
     end

lib/jekyll/document.rb

@@ -116,7 +116,7 @@ def relative_path
     #
     # Returns the output extension
     def output_ext
-      @output_ext ||= Jekyll::Renderer.new(site, self).output_ext
+      renderer.output_ext
     end
 
     # The base filename of the document, without the file extname.
@@ -133,6 +133,10 @@ def basename
       @basename ||= File.basename(path)
     end
 
+    def renderer
+      @renderer ||= Jekyll::Renderer.new(site, self)
+    end
+
     # Produces a "cleaned" relative path.
     # The "cleaned" relative path is the relative path without the extname
     #   and with the collection's directory removed as well.

lib/jekyll/site.rb

@@ -520,7 +520,8 @@ def render_pages(payload)
     def render_regenerated(document, payload)
       return unless regenerator.regenerate?(document)
 
-      document.output = Jekyll::Renderer.new(self, document, payload).run
+      document.renderer.payload = payload
+      document.output = document.renderer.run
       document.trigger_hooks(:post_render)
     end
   end