added Windows support.

Fixed build number and OS version for Windows.

Signed-off-by: Mike Lloyd <mike@reboot3times.org>

system/system_info_windows.go

@@ -0,0 +1,34 @@
+package system
+
+import (
+	"os/exec"
+	"strings"
+)
+
+type SystemInfo struct {
+	ProductName    string
+	ProductVersion string
+	BuildVersion   string
+}
+
+func NewSystemInfo() *SystemInfo {
+	m := make(map[string]string)
+
+	cmd := exec.Command("powershell.exe", "(Get-CimInstance Win32_OperatingSystem).version")
+	out, err := cmd.Output()
+	if err != nil {
+		panic(err)
+	}
+	s := strings.Split(string(out), ".")
+	m["ProductName"] = "Windows"
+	m["ProductVersion"] = "Windows " + s[0] + "." + s[1]
+	m["BuildVersion"] = s[2]
+
+	sysInfo := SystemInfo{
+		ProductName:    m["ProductName"],
+		ProductVersion: m["ProductVersion"],
+		BuildVersion:   m["BuildVersion"],
+	}
+
+	return &sysInfo
+}