add 'macroize' to utils

src/g-component.html

@@ -440,12 +440,24 @@ license that can be found in the LICENSE file.
         }
       };
 
+      // string interpolation
+      var macroize = function(inText, inMap, inPattern) {
+        var result = inText, pattern = inPattern || macroize.pattern;
+        var fn = function(macro, name) {
+          var v = inMap[name];
+          return (v === undefined || v === null) ? macro : v;
         };
+        result = result.replace(pattern, fn);
+        return result;
+      };
+      // Matches macros of the form {{name}}.
+      macroize.pattern = /\{{([^{}]*)\}}/g;
 
       // collect utils
 
       var utils = {
         job: job,
+        macroize: macroize,
         findDistributedTarget: findDistributedTarget
       };