Closes #32. OS version and build info into System module

system/system_info.go

@@ -0,0 +1,33 @@
+package system
+
+import (
+	"strings"
+)
+
+type SystemInfo struct {
+	ProductName    string
+	ProductVersion string
+	BuildVersion   string
+}
+
+func NewSystemInfo(raw string) *SystemInfo {
+	m := make(map[string]string)
+
+	for _, row := range strings.Split(raw, "\n") {
+		parts := strings.Split(row, ":")
+
+		if len(parts) < 2 {
+			continue
+		}
+
+		m[strings.TrimSpace(parts[0])] = strings.TrimSpace(parts[1])
+	}
+
+	sysInfo := SystemInfo{
+		ProductName:    m["ProductName"],
+		ProductVersion: m["ProductVersion"],
+		BuildVersion:   m["BuildVersion"],
+	}
+
+	return &sysInfo
+}

system/widget.go

@@ -2,6 +2,7 @@ package system
 
 import (
 	"fmt"
+	"os/exec"
 	"time"
 
 	"github.com/olebedev/config"
@@ -14,17 +15,21 @@ var Config *config.Config
 type Widget struct {
 	wtf.TextWidget
 
-	BuiltAt string
-	Version string
+	systemInfo *SystemInfo
+	BuiltAt    string
+	Version    string
 }
 
 func NewWidget(builtAt, version string) *Widget {
 	widget := Widget{
 		TextWidget: wtf.NewTextWidget(" Build ", "system", false),
-		BuiltAt:    builtAt,
-		Version:    version,
+
+		BuiltAt: builtAt,
+		Version: version,
 	}
 
+	widget.buildSystemInfo()
+
 	return &widget
 }
 
@@ -37,11 +42,15 @@ func (widget *Widget) Refresh() {
 
 	fmt.Fprintf(
 		widget.View,
-		"%6s: %s\n%6s: %s",
+		"%8s: %s\n%8s: %s\n\n%8s: %s\n%8s: %s",
 		"Built",
 		widget.prettyBuiltAt(),
 		"Vers",
 		widget.Version,
+		"OS",
+		widget.systemInfo.ProductVersion,
+		"Build",
+		widget.systemInfo.BuildVersion,
 	)
 
 	widget.RefreshedAt = time.Now()
@@ -55,3 +64,12 @@ func (widget *Widget) prettyBuiltAt() string {
 		return str.Format("Jan _2, 15:04")
 	}
 }
+
+func (widget *Widget) buildSystemInfo() {
+	arg := []string{}
+
+	cmd := exec.Command("sw_vers", arg...)
+	str := wtf.ExecuteCommand(cmd)
+
+	widget.systemInfo = NewSystemInfo(str)
+}