view_helpers.rb in gumdrop-1.1.2

- old
+ new

@@ -1,5 +1,7 @@
+require 'digest/md5'
+
 module Gumdrop
   
   module Util
     module ViewHelpers
       
@@ -27,9 +29,34 @@
         unless eng_class.nil?
           eng= eng_class.new { source }
           eng.render
         else
           raise StandardError, "Textile is not available: Include a Textile engine in your Gemfile!"
+        end
+      end
+
+      def uri_fresh(path)
+        if (path[0] == '/')
+          internal_path= path[1..-1]
+        else
+          internal_path= path
+          path= "/#{path}"
+        end
+        "#{ path }?v=#{ checksum_for internal_path }"
+      end
+
+      def cache_bust(path)
+        uri_fresh(path)
+      end
+
+      def checksum_for(path)
+        path= path[1..-1] if path[0] == '/'
+        @_checksum_cache ||= {}
+        if @_checksum_cache.has_key? path
+          @_checksum_cache[path]
+        else
+          content= render path
+          @_checksum_cache[path]= Digest::MD5.hexdigest( content )
         end
       end
       
       def config
         site.config