// indent increments (or decrements) the indentation.
func (x *expandState) indent(n int) {
	x.indentLevel += n
}

// Printf does an indented fmt.Printf on the format and args.
func (x *expandState) Printf(format string, a ...interface{}) (n int, err error) {
	if x.indentLevel > 0 {
		fmt.Printf("%[1]*s", x.indentLevel, "")
	}
	return fmt.Printf(format, a...)
}