Add version flag

Signed-off-by: Ali Yousuf <[email protected]>

cmd/twenty48/build.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+)
+
+// build variables
+var (
+	version = "dev"
+	commit  = "none"
+	date    = "unknown"
+)
+
+func PrintVersion() {
+	fmt.Printf("version: %s\ncommit: %s\nbuild at: %s\n", version, commit, date)
+}

cmd/twenty48/main.go

@@ -5,17 +5,25 @@ import (
 )
 
 var (
+	fVersion bool
+
 	fWidth  int
 	fHeight int
 )
 
 func init() {
+	flag.BoolVar(&fVersion, "version", false, "")
 	flag.IntVar(&fWidth, "width", 8, "board width")
 	flag.IntVar(&fHeight, "height", 8, "board height")
 }
 
 func main() {
 	flag.Parse()
 
+	if fVersion {
+		PrintVersion()
+		return
+	}
+
 	startGame(fWidth, fHeight)
 }