From da64f51589eaf41f1c3bdd7ed018c196035ff2aa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonatan=20K=C5=82osko?= <jonatanklosko@gmail.com>
Date: Thu, 3 Jun 2021 19:43:22 +0200
Subject: [PATCH] Show an informative message on completion when there is no
 runtime (#316)

---
 lib/livebook_web/live/session_live.ex | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/livebook_web/live/session_live.ex b/lib/livebook_web/live/session_live.ex
index dc6421e7d..e95569a15 100644
--- a/lib/livebook_web/live/session_live.ex
+++ b/lib/livebook_web/live/session_live.ex
@@ -514,7 +514,12 @@ defmodule LivebookWeb.SessionLive do
 
         {:reply, %{"completion_ref" => inspect(ref)}, socket}
       else
-        {:reply, %{"completion_ref" => nil}, socket}
+        {:reply, %{"completion_ref" => nil},
+         put_flash(
+           socket,
+           :info,
+           "You need to start a runtime (or evaluate a cell) for accurate completion"
+         )}
       end
     else
       _ -> {:noreply, socket}