feat: update -version output

cmd/server/main.go

@@ -28,8 +28,8 @@ func Start() {
 
 	// show server and protocl version and exit
 	if *showVersionFlag {
-		fmt.Println("Server-Version:", metadata.GoTomatoVersion)
-		fmt.Println("Protocol-Version:", metadata.ProtocolVersion)
+		fmt.Printf("GoTomato v%s\n", metadata.GoTomatoVersion)
+		fmt.Printf("Protocol-Version: %s\n", metadata.ProtocolVersion)
 		os.Exit(0)
 	}
 

internal/metadata/version.go

@@ -1,7 +1,20 @@
 package metadata
 
-import "strings"
+import (
+	"os/exec"
+	"strings"
+)
 
-// This will be overwritten by goreleaser on build
-var GoTomatoVersion = "devel"                                // The GoTomato version
-var ProtocolVersion = strings.Split(GoTomatoVersion, ".")[0] // The protocol version
+var (
+	GoTomatoVersion = "" // The GoTomato version
+	ProtocolVersion = "" // The protocol version
+)
+
+func init() {
+	if GoTomatoVersion == "" {
+		output, _ := exec.Command("git", "describe", "--tags").Output()
+		trimmed_output := strings.TrimSpace(string(output))           // strip newlines
+		GoTomatoVersion = strings.Replace(trimmed_output, "v", "", 1) // strip leading "v"
+	}
+	ProtocolVersion = strings.Split(GoTomatoVersion, ".")[0] // The protocol version
+}