Add version flag (specially für sava)

telegabber.go

@@ -15,6 +15,8 @@ import (
 	goxmpp "gosrc.io/xmpp"
 )
 
+const version string = "1.2.1-dev"
+
 var sm *goxmpp.StreamManager
 var component *goxmpp.Component
 var err error
@@ -28,8 +30,14 @@ func main() {
 	var configPath = flag.String("config", "config.yml", "Config file path")
 	// JSON schema (not for editing by a user)
 	var schemaPath = flag.String("schema", "./config_schema.json", "Schema file path")
+	var versionFlag = flag.Bool("version", false, "Print the version and exit")
 	flag.Parse()
 
+	if *versionFlag {
+		fmt.Printf("%v\n", version)
+		os.Exit(0)
+	}
+
 	if *profilingPort > 0 {
 		go func() {
 			log.Println(http.ListenAndServe(fmt.Sprintf("localhost:%v", *profilingPort), nil))