Remove used blocks from templates

lib/template.js

@@ -80,18 +80,22 @@ var TemplateEngine = function(book) {
 // Process a block in a context
 TemplateEngine.prototype.processBlock = function(blk) {
     if (_.isString(blk)) blk = { body: blk };
+
     blk = _.defaults(blk, {
         parse: false
     });
     blk.id = _.uniqueId("blk");
 
+    //Parsable block, just return it
+    if (blk.parse) {
+        return blk.body;
+    }
+
     // Add to global map
     this.blocks[blk.id] = blk;
 
-    // If don't parse id, return it as a macro
-    if (!blk.parse) return "%+%"+blk.id+"%+%";
-
-    return blk.body;
+    // Return it as a macro
+    return "%+%"+blk.id+"%+%";
 };
 
 // Replace blocks by body after processing
@@ -101,8 +105,14 @@ TemplateEngine.prototype.replaceBlocks = function(content) {
 
     return content.replace(/\%\+\%([\s\S]+?)\%\+\%/g, function(match, key) {
         var blk = that.blocks[key];
-        if (!blk || blk.parse) return match;
-        return blk.body;
+        if (!blk) return match;
+
+        var body = blk.body;
+
+        // Remove it from map
+        delete that.blocks[key];
+
+        return body;
     });
 };