Function Diff

pkg/test/diff.go:27–51

Diff returns the unified diff (from running "diff -u") or returns an error string.

(a, b []byte)

// Diff returns the unified diff (from running "diff -u") or
// returns an error string.
func Diff(a, b []byte) string {
	if bytes.Equal(a, b) {
		return ""
	}
	ta, err := os.CreateTemp("", "")
	if err != nil {
		return err.Error()
	}
	tb, err := os.CreateTemp("", "")
	if err != nil {
		return err.Error()
	}
	defer os.Remove(ta.Name())
	defer os.Remove(tb.Name())
	// Lqzy...
	ta.Write(a)
	tb.Write(b)
	ta.Close()
	tb.Close()
	out, err := exec.Command("diff", "-u", ta.Name(), tb.Name()).CombinedOutput()
	if err != nil && len(out) == 0 {
		return err.Error()
	}
	return string(out)
}