And read CSS from embedded FS. Bumped to v5

main.go

@@ -7,6 +7,7 @@ import (
 	"embed"
 	"encoding/json"
 	"flag"
+	"fmt"
 	"html/template"
 	"io"
 	"log"
@@ -16,12 +17,12 @@ import (
 	"strings"
 )
 
-const VERSION = "v1"
+const VERSION = "v5"
 
 var (
 	flagVerbose       bool
-	flagWsURL   string
-	flagWatch   string
+	flagVersion       bool
+	flagDebuggingPort int
 
 	//go:embed static
 	fs embed.FS
@@ -29,10 +30,15 @@ var (
 
 func main() {
 	flag.BoolVar(&flagVerbose, "v", false, "verbose")
-	flag.StringVar(&flagWsURL, "ws", "ws://127.0.0.1:9222", "devtools url")
-	flag.StringVar(&flagWatch, "watch", "", "Files to watch")
+	flag.BoolVar(&flagVersion, "version", false, "Print version and exit")
+	flag.IntVar(&flagDebuggingPort, "port", 9222, "Chrome debugging port")
 	flag.Parse()
 
+	if flagVersion {
+		fmt.Println(VERSION)
+		return
+	}
+
 	http.HandleFunc("/", pageIndex)
 	http.HandleFunc("/css/main.css", pageCSS)
 
@@ -43,7 +49,11 @@ func main() {
 	http.HandleFunc("/sites", actionSites)
 
 	log.Println("Listen on [::]:5123")
-	http.ListenAndServe("[::]:5123", nil)
+	err := http.ListenAndServe("[::]:5123", nil)
+	if err != nil {
+		log.Println(err)
+		os.Exit(1)
+	}
 }
 
 func replaceTilde(str string) string { // {{{
@@ -63,10 +73,7 @@ func replaceTilde(str string) string {// {{{
 func pageIndex(w http.ResponseWriter, r *http.Request) { // {{{
 	var tmpl *template.Template
 	var err error
-	if false {
 	tmpl, err = template.ParseFS(fs, "static/html/index.html")
-	}
-	tmpl, err = template.ParseFiles("static/html/index.html")
 	if err != nil {
 		w.Write([]byte(err.Error()))
 		return
@@ -81,8 +88,7 @@ func pageIndex(w http.ResponseWriter, r *http.Request) { // {{{
 func pageCSS(w http.ResponseWriter, r *http.Request) { // {{{
 	w.Header().Add("Content-Type", "text/css")
 
-	//data, err := fs.ReadFile("static/css/main.css")
-	data, err := os.ReadFile("static/css/main.css")
+	data, err := fs.ReadFile("static/css/main.css")
 	if err != nil {
 		w.Write([]byte(err.Error()))
 		return
@@ -103,7 +109,7 @@ func actionSites(w http.ResponseWriter, r *http.Request) { // {{{
 func actionBrowserStart(w http.ResponseWriter, r *http.Request) { // {{{
 	body, _ := io.ReadAll(r.Body)
 	userDataDir := replaceTilde(string(body))
-	browser := exec.Command("google-chrome", "--user-data-dir="+string(userDataDir), "--remote-debugging-port=9222")
+	browser := exec.Command("google-chrome", "--user-data-dir="+string(userDataDir), fmt.Sprintf("--remote-debugging-port=%d", flagDebuggingPort))
 	err := browser.Start()
 	if err != nil {
 		log.Println(err)
@@ -133,7 +139,8 @@ func actionStart(w http.ResponseWriter, r *http.Request) { // {{{
 
 	var site Site
 	expandedWatch := replaceTilde(req.Watch)
-	site, err = NewSite(flagWsURL, req.URL, expandedWatch)
+	wsURL := fmt.Sprintf("ws://127.0.0.1:%d", flagDebuggingPort)
+	site, err = NewSite(wsURL, req.URL, expandedWatch)
 	if err != nil {
 		log.Println(err)
 	}