Check for data on stdin in Go

main.go

	if fi, _ := os.Stdin.Stat(); fi.Mode()&os.ModeNamedPipe != 0 || fi.Mode()&os.ModeCharDevice == 0 {
		data, err := io.ReadAll(os.Stdin)
		if err != nil {
			log.Fatal(err)
		}
		...
	}