Feat: detecting a git version.

main.go

@@ -1,7 +1,24 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+)
 
-func main () {
+const header = "package main\nconst Value = \""
-    fmt.Println("version is here")
+
+func main() {
+	cmd := exec.Command("git", "describe", "--tags", "--abbrev=0")
+	out, err := cmd.Output()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(0)
+	}
+	version := string(out)
+	version = version[:len(version)-1]
+	content := header + version + "\""
+
+	ioutil.WriteFile("version.go", []byte(content), 0644)
 }