Merge pull request #890 from zachgersh/abbreviated_month

Added abbreviated month + test.

lib/jekyll/post.rb

@@ -169,6 +169,7 @@ module Jekyll
           "i_day"      => date.strftime("%d").to_i.to_s,
           "i_month"    => date.strftime("%m").to_i.to_s,
           "categories" => categories.map { |c| URI.escape(c.to_s) }.join('/'),
+          "short_month" => date.strftime("%b"),
           "output_ext" => self.output_ext
         }.inject(template) { |result, token|
           result.gsub(/:#{Regexp.escape token.first}/, token.last)

test/test_post.rb

@@ -225,6 +225,17 @@ class TestPost < Test::Unit::TestCase
           end
         end
 
+        context "with custom abbreviated month date permalink" do
+          setup do
+            @post.site.permalink_style = '/:categories/:year/:short_month/:day/:title/'
+            @post.process(@fake_file)
+          end
+
+          should "process the url correctly" do
+            assert_equal "/2008/Sep/09/foo-bar/", @post.url
+          end
+        end
+
         context "with prefix style and no extension" do
           setup do
             @post.site.permalink_style = "/prefix/:title"