Add an config param allowing to delay renicking if the previously tried nick was already in use

client/connection.go

@@ -112,6 +112,9 @@ type Config struct {
 	// See DefaultNewNick implementation below for details.
 	NewNick func(string) string
 
+	// A delay in NewNick before actually sending the new nick command. Default is not set, so it's 0.
+	ReNickDelay time.Duration
+
 	// Client->server ping frequency, in seconds. Defaults to 3m.
 	// Set to 0 to disable client-side pings.
 	PingFreq time.Duration

client/handlers.go

@@ -310,6 +310,9 @@ func (conn *Conn) h_001(line *Line) {
 
 // Handler to deal with "433 :Nickname already in use"
 func (conn *Conn) h_433(line *Line) {
+	// Delay trying again if a non-zero delay was set 
+	time.Sleep(conn.cfg.ReNickDelay)
+
 	// Args[1] is the new nick we were attempting to acquire
 	me := conn.Me()
 	neu := conn.cfg.NewNick(line.Args[1])