Specify port with -port argument

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"gitlab.com/golang-commonmark/markdown"
 	"html/template"
@@ -409,6 +410,10 @@ func (h *recentHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 }
 
 func main() {
+	var port int
+	flag.IntVar(&port, "port", 8080, "http port")
+	flag.Parse()
+
 	mp = NewFilePages("data")
 
 	http.Handle("/auth/", &authHandler{})
@@ -419,6 +424,6 @@ func main() {
 	http.Handle("/recent/", &recentHandler{})
 	http.Handle("/", &indexHandler{})
 
-	fmt.Printf("Running on port 8080")
-	log.Fatal(http.ListenAndServe(":8080", nil))
+	fmt.Printf("Running on port %d\n", port)
+	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", port), nil))
 }