add --version flag

ensure version is injected at build time in makefile/taskfile

cmd/q3rcon/main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"runtime/debug"
 	"strings"
 	"time"
 
@@ -14,6 +15,8 @@ import (
 	"github.com/onyx-and-iris/q3rcon"
 )
 
+var version string // Version will be set at build time
+
 func main() {
 	var exitCode int
 
@@ -42,6 +45,7 @@ func run() (func(), error) {
 		rconpass    string
 		interactive bool
 		loglevel    string
+		versionFlag bool
 	)
 
 	flag.StringVar(&host, "host", "localhost", "hostname of the gameserver")
@@ -67,8 +71,16 @@ func run() (func(), error) {
 	flag.StringVar(&loglevel, "loglevel", "warn", "log level")
 	flag.StringVar(&loglevel, "l", "warn", "log level (shorthand)")
 
+	flag.BoolVar(&versionFlag, "version", false, "print version information and exit")
+	flag.BoolVar(&versionFlag, "v", false, "print version information and exit (shorthand)")
+
 	flag.Parse()
 
+	if versionFlag {
+		fmt.Printf("q3rcon version: %s\n", versionFromBuild())
+		return nil, nil
+	}
+
 	level, err := log.ParseLevel(loglevel)
 	if err != nil {
 		return nil, fmt.Errorf("invalid log level: %s", loglevel)
@@ -110,6 +122,18 @@ func run() (func(), error) {
 	return closer, nil
 }
 
+// versionFromBuild retrieves the version information from the build metadata.
+func versionFromBuild() string {
+	if version == "" {
+		info, ok := debug.ReadBuildInfo()
+		if !ok {
+			return "(unable to read build info)"
+		}
+		version = strings.Split(info.Main.Version, "-")[0]
+	}
+	return version
+}
+
 func connectRcon(host string, port int, password string) (*q3rcon.Rcon, func(), error) {
 	client, err := q3rcon.New(host, port, password, q3rcon.WithTimeouts(map[string]time.Duration{
 		"map":         time.Second,