From 165eff6734a8d10ef10524b6fec7f1eed5ecab2c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonatan=20K=C5=82osko?= <jonatanklosko@gmail.com>
Date: Sat, 22 Jul 2023 00:23:14 +0200
Subject: [PATCH] Fix smart cell editor when no language is specified

---
 assets/js/hooks/cell_editor.js | 8 ++++++--
 lib/livebook/runtime.ex        | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/assets/js/hooks/cell_editor.js b/assets/js/hooks/cell_editor.js
index 12c18170b..d24b7a7d7 100644
--- a/assets/js/hooks/cell_editor.js
+++ b/assets/js/hooks/cell_editor.js
@@ -1,5 +1,9 @@
 import LiveEditor from "./cell_editor/live_editor";
-import { getAttributeOrThrow, parseBoolean } from "../lib/attribute";
+import {
+  getAttributeOrDefault,
+  getAttributeOrThrow,
+  parseBoolean,
+} from "../lib/attribute";
 
 const CellEditor = {
   mounted() {
@@ -70,7 +74,7 @@ const CellEditor = {
     return {
       cellId: getAttributeOrThrow(this.el, "data-cell-id"),
       tag: getAttributeOrThrow(this.el, "data-tag"),
-      language: getAttributeOrThrow(this.el, "data-language"),
+      language: getAttributeOrDefault(this.el, "data-language", null),
       intellisense: getAttributeOrThrow(
         this.el,
         "data-intellisense",
diff --git a/lib/livebook/runtime.ex b/lib/livebook/runtime.ex
index 121958904..7f39282d3 100644
--- a/lib/livebook/runtime.ex
+++ b/lib/livebook/runtime.ex
@@ -364,7 +364,7 @@ defprotocol Livebook.Runtime do
   @typedoc """
   Smart cell editor configuration.
   """
-  @type editor :: %{language: String.t(), placement: :bottom | :top, source: String.t()}
+  @type editor :: %{language: String.t() | nil, placement: :bottom | :top, source: String.t()}
 
   @typedoc """
   An opaque file reference.