Add Telegram sticker handler

internal/handlers/telegram/handler.go

@@ -30,6 +30,17 @@ func messageHandler(tg *Client, u tgbotapi.Update) {
 	tg.sendToIrc(formatted)
 }
 
+/*
+stickerHandler handles the Message.Sticker Telegram Object, which formats the
+Telegram message into its base Emoji unicode character.
+*/
+func stickerHandler(tg *Client, u tgbotapi.Update) {
+	formatted := tg.Settings.Prefix + u.Message.From.UserName +
+		tg.Settings.Suffix + u.Message.Sticker.Emoji
+
+	tg.sendToIrc(formatted)
+}
+
 /*
 documentHandler receives a document object from Telegram, and sends
 a notification to IRC.

internal/handlers/telegram/telegram.go

@@ -70,16 +70,18 @@ func (tg *Client) StartBot(errChan chan<- error, sendMessage func(string)) {
 
 	// TODO: Move these lines into the updateHandler when available
 	for update := range updates {
-		if update.Message == nil {
-			continue
+		switch {
+			case update.Message == nil:
+				continue
+			case update.Message.Text != "":
+				messageHandler(tg, update)
+			case update.Message.Sticker != nil:
+				stickerHandler(tg, update)
+			case update.Message.Document != nil:
+				documentHandler(tg, update.Message)
+			default:
+				continue
 		}
-
-		if update.Message.Document != nil {
-			documentHandler(tg, update.Message)
-		} else {
-			messageHandler(tg, update)
-		}
-
 	}
 	errChan <- nil
 }