webcmd: external versioning

App.go

@@ -10,6 +10,8 @@ import (
 	"sync"
 )
 
+var APP_VERSION string = "x.x.x" // Overridden by makefile
+
 type App struct {
 	cfg AppConfig
 
@@ -44,7 +46,7 @@ func NewAppFromConfig(cfg AppConfig) *App {
 }
 
 func (this *App) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Server", "webcmd/1.0")
+	w.Header().Set("Server", "webcmd/"+APP_VERSION)
 
 	if r.Method == "GET" {
 		if r.URL.Path == "/" {

cmd/webcmd/main.go

@@ -2,15 +2,23 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"log"
+	"os"
 
 	"code.ivysaur.me/webcmd"
 )
 
 func main() {
 	confPath := flag.String("config", "webcmd.conf", "Path to configuration file")
+	versionFlag := flag.Bool("version", false, "Display version number and exit")
 	flag.Parse()
 
+	if *versionFlag {
+		fmt.Println("webcmd/" + webcmd.APP_VERSION)
+		os.Exit(0)
+	}
+
 	app, err := webcmd.NewApp(*confPath)
 	if err != nil {
 		log.Fatalf(err.Error())