port parse

main.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"embed"
+	"flag"
+	"fmt"
 	"html/template"
 	"io/fs"
 	"log"
@@ -12,6 +14,9 @@ import (
 var sourceFS embed.FS
 
 func main() {
+	port := flag.Int("port", 8081, "port to listen on")
+	flag.Parse()
+
 	staticRoot, err := fs.Sub(sourceFS, "source")
 	if err != nil {
 		log.Fatal(err)
@@ -152,6 +157,8 @@ func main() {
 
 	mux.Handle("/static/", http.StripPrefix("/static/", http.FileServerFS(assetsRoot)))
 
-	log.Println("running on http://localhost:8081/")
-	log.Fatal(http.ListenAndServe(":8081", mux))
+	addr := fmt.Sprintf(":%d", *port)
+	log.Printf("running on http://localhost%s/\n", addr)
+	log.Fatal(http.ListenAndServe(addr, mux))
+
 }