Move Cache into Util

middleman-core/lib/middleman-core/util.rb

@@ -31,5 +31,60 @@ module Middleman
     def self.normalize_path(path)
       path.sub(/^\//, "").gsub("%20", " ")
     end
+    
+    # Simple shared cache implementation
+    class Cache
+      # Initialize
+      def initialize
+        self.clear
+      end
+
+      # Either get the cached key or save the contents of the block
+      #
+      # @param Anything Hash can use as a key
+      # @return Cached value
+      def fetch(*key)
+        @cache[key] ||= yield
+      end
+
+      # Whether the key is in the cache
+      # 
+      # @param Anything Hash can use as a key
+      # @return [Boolean]
+      def has_key?(key)
+        @cache.has_key?(key)
+      end
+
+      # Get a specific key
+      #
+      # @param Anything Hash can use as a key
+      # @return Cached value
+      def get(key)
+        @cache[key]
+      end
+
+      def keys
+        @cache.keys
+      end
+
+      # Clear the entire cache
+      def clear
+        @cache = {}
+      end
+
+      # Set a specific key
+      #
+      # @param Anything Hash can use as a key
+      # @param Cached value
+      def set(key, value)
+        @cache[key] = value
+      end
+
+      # Remove a specific key
+      # @param Anything Hash can use as a key
+      def remove(*key)
+        @cache.delete(key)
+      end
+    end
   end
 end