Check if a user was mentioned, but ignore its own messages

buttsbot.go

@@ -40,6 +40,7 @@ func main() {
 
 	//Handlers
 	Session.AddHandler(ready)
+	Session.AddHandler(messageCreate)
 
 	//Open a connection to Discord
 	err = Session.Open()
@@ -66,3 +67,26 @@ func ready(s *discordgo.Session, event *discordgo.Ready) {
 	s.UpdateStatus(0, "with butts!")
 	s.ChannelMessageSend(bot_channel, "This isn't a butt...")
 }
+
+func messageCreate(s *discordgo.Session, m *discordgo.MessageCreate) {
+	//Ignore messages by itself
+	if m.Author.ID == s.State.User.ID {
+		return
+	}
+
+	//Check if the bot was mentioned
+	if isUserMentioned(m, s.State.User) == true {
+		s.ChannelMessageSend(m.ChannelID, "butt")
+	}
+}
+
+//Easy way to check if a user was mentioned in a message
+func isUserMentioned(m *discordgo.MessageCreate, u *discordgo.User) bool {
+	//mentioned := false
+	for _, user := range m.Mentions {
+		if user.ID == u.ID {
+			return true
+		}
+	}
+	return false
+}