add text commands: /quit /exit /deafen /clear /help

ui.go

@@ -135,6 +135,20 @@ func (b *Barnard) OnTextInput(ui *uiterm.Ui, textbox *uiterm.Textbox, text strin
 	if text == "" {
 		return
 	}
+	switch strings.TrimSpace(text) {
+	case "/quit", "/exit":
+		b.OnQuitPress(ui, 0)
+		return
+	case "/deafen":
+		b.OnDeafenToggle(ui, 0)
+		return
+	case "/clear":
+		b.OnClearPress(ui, 0)
+		return
+	case "/help":
+		b.AddOutputLine("/quit /exit /deafen /clear /help")
+		return
+	}
 	if b.Client != nil && b.Client.Self != nil {
 		b.Client.Self.Channel.Send(text, false)
 		b.AddOutputMessage(b.Client.Self, text)