port number is now an argument

implemented actions for auto-building!

bang.go

@@ -5,6 +5,7 @@ import (
 	"crypto/sha256"
 	"encoding/base64"
 	"encoding/json"
+	"flag"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -329,10 +330,13 @@ func withCORS(handler http.HandlerFunc) http.HandlerFunc {
 }
 
 func main() {
+	port := flag.Int("port", 8080, "port to listen on")
+	flag.Parse()
+
 	http.HandleFunc("/users", withCORS(createUserHandler))
 	http.HandleFunc("/email", withCORS(receiveEmailHandler))
 	http.HandleFunc("/mailbox", withCORS(listMailboxHandler))
 	http.HandleFunc("/mailbox/open", withCORS(markEmailOpenedHandler))
-	log.Println("Email server running on :80")
-	log.Fatal(http.ListenAndServe(":80", nil))
+	log.Printf("Email server running on :%d", *port)
+	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", *port), nil))
 }