Add inspect filter

lib/jekyll/filters.rb

@@ -248,6 +248,15 @@ module Jekyll
       end
     end
 
+    # Convert an object into its String representation for debugging
+    #
+    # input - The Object to be converted
+    #
+    # Returns a String representation of the object.
+    def inspect(input)
+      CGI.escapeHTML(input.inspect)
+    end
+
     private
     def time(input)
       case input

test/test_filters.rb

@@ -211,5 +211,11 @@ class TestFilters < Test::Unit::TestCase
       end
     end
 
+    context "inspect filter" do
+      should "return a HTML-escaped string representation of an object" do
+        assert_equal "{&quot;&lt;a&gt;&quot;=&gt;1}", @filter.inspect({ "<a>" => 1 })
+      end
+    end
+
   end
 end