Added the System widget with basic build info

system/widget.go

@@ -0,0 +1,57 @@
+package system
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/olebedev/config"
+	"github.com/senorprogrammer/wtf/wtf"
+)
+
+// Config is a pointer to the global config object
+var Config *config.Config
+
+type Widget struct {
+	wtf.TextWidget
+
+	BuiltAt string
+	Version string
+}
+
+func NewWidget(builtAt, version string) *Widget {
+	widget := Widget{
+		TextWidget: wtf.NewTextWidget(" System ", "system"),
+		BuiltAt:    builtAt,
+		Version:    version,
+	}
+
+	return &widget
+}
+
+func (widget *Widget) Refresh() {
+	if widget.Disabled() {
+		return
+	}
+
+	widget.View.Clear()
+
+	fmt.Fprintf(
+		widget.View,
+		"%6s: %s\n%6s: %s",
+		"Built",
+		widget.prettyBuiltAt(),
+		"Vers",
+		widget.Version,
+	)
+
+	widget.RefreshedAt = time.Now()
+}
+
+func (widget *Widget) prettyBuiltAt() string {
+	str, err := time.Parse("2006-01-02T15:04:05-0700", widget.BuiltAt)
+	if err != nil {
+		return err.Error()
+	} else {
+		return str.Format("Jan _2, 15:04")
+	}
+}