code: function(offset, newline){
      var ast;
      offset = offset || 0;
      newline = newline ? '\n' : '';
      ast = this.buffer(newline + Array(this.indents + offset).join(this.pp));
      if (this.parentIndents) {
  
        push.apply(ast, this.ast_buffer(t.callExpression(
                                  t.memberExpression(t.identifier('pug_indent'), t.identifier('join')),
                                  [t.stringLiteral('')]
                                )));
  
      }
      return ast;
    }
docs: Buffer an indent based on the current `indent`
  property and an additional `offset`.
  
  @param {Number} offset
  @param {Boolean} newline
  @api public