Let user specify port

main.go

@@ -1,10 +1,14 @@
 package main
 
 import (
+	"flag"
+	"fmt"
 	"log"
 	"net/http"
 )
 
+var port = flag.Int("port", 8000, "port from which to serve")
+
 func logger(h http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		log.Printf("%s: %s\n", r.RemoteAddr, r.URL)
@@ -13,6 +17,11 @@ func logger(h http.Handler) http.Handler {
 }
 
 func main() {
+	flag.Parse()
+	addr := fmt.Sprintf(":%d", *port)
 	fh := http.FileServer(http.Dir("./"))
 	http.ListenAndServe(":8080", logger(fh))
+	if err := http.ListenAndServe(addr, logger(fh)); err != nil {
+		log.Fatal(err)
+	}
 }