host

var (
	InterfaceAddrs = net.InterfaceAddrs
	Now            = func() string { return time.Now().UTC().Format(time.RFC3339Nano) }
)

var GetKernelVersion = func() (string, error) {
	out, err := exec.Command("uname", "-v").CombinedOutput()
	if err != nil {
		return "Darwin unknown", err
	}
	matches := unameRe.FindAllStringSubmatch(string(out), -1)
	if matches == nil || len(matches) < 1 || len(matches[0]) < 1 {
		return "Darwin unknown", nil
	}
	return fmt.Sprintf("Darwin %s", matches[0][1]), nil
}

var GetLoad = func() string {
	out, err := exec.Command("w").CombinedOutput()
	if err != nil {
		return "unknown"
	}
	matches := loadRe.FindAllStringSubmatch(string(out), -1)
	if matches == nil || len(matches) < 1 || len(matches[0]) < 4 {
		return "unknown"
	}
	return fmt.Sprintf("%s %s %s", matches[0][1], matches[0][2], matches[0][3])
}

var GetUptime = func() (time.Duration, error) {
	out, err := exec.Command("w").CombinedOutput()
	if err != nil {
		return 0, err
	}
	matches := uptimeRe.FindAllStringSubmatch(string(out), -1)
	if matches == nil || len(matches) < 1 || len(matches[0]) < 4 {
		return 0, err
	}
	d, err := strconv.Atoi(matches[0][1])
	if err != nil {
		return 0, err
	}
	h, err := strconv.Atoi(matches[0][2])
	if err != nil {
		return 0, err
	}
	m, err := strconv.Atoi(matches[0][3])
	if err != nil {
		return 0, err
	}
	return (time.Duration(d) * 24 * time.Hour) + (time.Duration(h) * time.Hour) + (time.Duration(m) * time.Minute), nil
}