From fc098c7d508ab82aaf7a817373b16319a2861547 Mon Sep 17 00:00:00 2001
From: Lan Tian <xuyh0120@outlook.com>
Date: Mon, 29 Jun 2020 15:04:32 +0800
Subject: [PATCH] frontend: improve empty result handling

---
 frontend/telegram_bot.go | 36 +++++++++++++++++++-----------------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/frontend/telegram_bot.go b/frontend/telegram_bot.go
index 8491f9e..4767e42 100644
--- a/frontend/telegram_bot.go
+++ b/frontend/telegram_bot.go
@@ -145,22 +145,24 @@ func webHandlerTelegramBot(w http.ResponseWriter, r *http.Request) {
 	}
 
 	commandResult = strings.TrimSpace(commandResult)
-	if len(commandResult) > 0 {
-		// Create a JSON response
-		w.Header().Add("Content-Type", "application/json")
-		response := &tgWebhookResponse{
-			Method:           "sendMessage",
-			ChatID:           request.Message.Chat.ID,
-			Text:             "```\n" + commandResult + "\n```",
-			ReplyToMessageID: request.Message.MessageID,
-			ParseMode:        "Markdown",
-		}
-		data, err := json.Marshal(response)
-		if err != nil {
-			println(err.Error())
-			return
-		}
-		// println(string(data))
-		w.Write(data)
+	if len(commandResult) < 0 {
+		commandResult = "empty result"
 	}
+
+	// Create a JSON response
+	w.Header().Add("Content-Type", "application/json")
+	response := &tgWebhookResponse{
+		Method:           "sendMessage",
+		ChatID:           request.Message.Chat.ID,
+		Text:             "```\n" + commandResult + "\n```",
+		ReplyToMessageID: request.Message.MessageID,
+		ParseMode:        "Markdown",
+	}
+	data, err := json.Marshal(response)
+	if err != nil {
+		println(err.Error())
+		return
+	}
+	// println(string(data))
+	w.Write(data)
 }