From 4b471fe9fb27d9e9eab637eacf2adb45aea0c8c1 Mon Sep 17 00:00:00 2001
From: Parker Moore <parkrmoore@gmail.com>
Date: Thu, 31 Mar 2016 13:39:08 -0700
Subject: [PATCH] DocumentDrop: add `#<=>` which sorts by date (falling back to
 path)

---
 lib/jekyll/drops/document_drop.rb | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lib/jekyll/drops/document_drop.rb b/lib/jekyll/drops/document_drop.rb
index 69933752..4eb9e50c 100644
--- a/lib/jekyll/drops/document_drop.rb
+++ b/lib/jekyll/drops/document_drop.rb
@@ -20,6 +20,13 @@ module Jekyll
         fallback_data['excerpt'].to_s
       end
 
+      def <=>(other)
+        return nil unless other.is_a? DocumentDrop
+        cmp = self['date'] <=> other['date']
+        cmp = self['path'] <=> other['path'] if cmp.nil? || cmp == 0
+        cmp
+      end
+
       private
       def_delegator :@obj, :data, :fallback_data
     end