Add StaticFile#to_liquid['extname'] :)

lib/jekyll/static_file.rb

@@ -75,7 +75,8 @@ module Jekyll
     def to_liquid
       {
         "path"          => relative_path,
-        "modified_time" => mtime.to_s
+        "modified_time" => mtime.to_s,
+        "extname"       => File.extname(relative_path)
       }
     end
   end

test/source/static_files.html

@@ -1,6 +1,4 @@
 ---
 ---
-
 {% for file in site.static_files %}
-  - {{ file.path }} last edited at {{ file.modified_time }}
-{% endfor %}
+- {{ file.path }} last edited at {{ file.modified_time }} with extname {{ file.extname }}{% endfor %}

test/test_generated_site.rb

@@ -46,7 +46,12 @@ class TestGeneratedSite < Test::Unit::TestCase
     end
 
     should "print a nice list of static files" do
-      assert_equal "", File.read(dest_dir('static_files.html'))
+      expected_output = Regexp.new <<-OUTPUT
+- /css/screen.css last edited at \\d+ with extname .css
+- /products.yml last edited at \\d+ with extname .yml
+- /symlink-test/symlinked-dir/screen.css last edited at \\d+ with extname .css
+OUTPUT
+      assert_match expected_output, File.read(dest_dir('static_files.html'))
     end
   end