Helper to diff lines for debugging multi-line output

quick_line_diff.go

func diffLines(a, b string) {
	fmt.Printf("len(a) %d len(b) %d\n", len(a), len(b))
	sa := bufio.NewScanner(strings.NewReader(a))
	sb := bufio.NewScanner(strings.NewReader(b))

	index := 0
	for {
		index++
		var readSomething bool
		var aline string
		var bline string
		if sa.Scan() {
			aline = sa.Text()
			readSomething = true
		}
		if sb.Scan() {
			bline = sb.Text()
			readSomething = true
		}
		if !readSomething {
			break
		}
		if aline != bline {
			fmt.Printf("%4d:\ngot:\n%s\nwant:\n%s\n", index, aline, bline)
		}
	}
}