Extracted each method

lib/jekyll/site.rb

@@ -240,9 +240,7 @@ module Jekyll
 
       # files to be written
       files = Set.new
-      [self.posts, self.pages, self.static_files].flatten.each do |item|
-        files << item.destination(self.dest)
-      end
+      site_files_each { |item| files << item.destination(self.dest) }
 
       # adding files' parent directories
       dirs = Set.new
@@ -269,9 +267,7 @@ module Jekyll
     #
     # Returns nothing.
     def write
-      [self.posts, self.pages, self.static_files].flatten.each do |item|
-        item.write(self.dest)
-      end
+      site_files_each { |item| item.write(self.dest) }
     end
 
     # Construct a Hash of Posts indexed by the specified Post attribute.
@@ -404,6 +400,14 @@ module Jekyll
       end
     end
 
+    def site_files_each
+      %w(posts pages static_files).each do |type|
+        self.send(type).each do |item|
+          yield item
+        end
+      end
+    end
+
     private
 
     def has_yaml_header?(file)