Handle nick collisions by right-padding with _

irc/client.go

@@ -21,6 +21,7 @@ type Client struct {
 	Realname          string
 	Messages          chan *Message
 	ConnectionChanged chan bool
+	HandleNickInUse   func(string) string
 
 	nick     string
 	channels []string

irc/conn.go

@@ -188,6 +188,12 @@ func (c *Client) recv() {
 
 		case ReplyWelcome:
 			c.once.Do(c.ready.Done)
+
+		case "433":
+			if c.HandleNickInUse != nil {
+				c.nick = c.HandleNickInUse(c.nick)
+				c.writeNick(c.nick)
+			}
 		}
 	}
 }