Order posts by slug name if the date is the same

features/site_data.feature

@@ -65,10 +65,12 @@ Feature: Site data
   And I have an "index.html" page that contains "{% for post in site.posts %}{{ post.title }}:{{ post.previous.title}},{{ post.next.title}} {% endfor %}"
   And I have the following posts:
     | title | date      | content |
+    | first | 2/26/2009 | first   |
     | A     | 3/26/2009 | A       |
     | B     | 3/26/2009 | B       |
     | C     | 3/26/2009 | C       |
+    | last  | 4/26/2009 | last    |
   When I run jekyll
   Then the _site directory should exist
-  And I should see "C:B, B:A,C A:,B" in "_site/index.html"
+  And I should see "last:C, C:B,last B:A,C A:first,B first:,A" in "_site/index.html"
   

lib/jekyll/post.rb

@@ -70,11 +70,15 @@ module Jekyll
       end
     end
 
-    # Spaceship is based on Post#date
+    # Spaceship is based on Post#date, slug
     #
     # Returns -1, 0, 1
     def <=>(other)
-      self.date <=> other.date
+      cmp = self.date <=> other.date
+      if 0 == cmp
+       cmp = self.slug <=> other.slug
+      end
+      return cmp
     end
 
     # Extract information from the post filename