code: function replaceShortcuts(blocks, filePath, content) {
      var shortcuts = listShortcuts(blocks, filePath);
      return shortcuts.reduce(applyShortcut, content);
  }
docs: Replace shortcuts from blocks in a string
  
  @param {List<TemplateBlock>} engine
  @param {String} filePath
  @param {String} content
  @return {String}