fix: unset variable by setting its value to nil (#5)

Author: fahchen

lib/kino/excalidraw/options.ex

@@ -55,11 +55,13 @@ defmodule Kino.Excalidraw.Options do
   end
 
   @option_names [:variable, "variable"]
-  defp build_option({option, value}) when is_binary(value) when option in @option_names do
+  defp build_option({option, value}) when is_binary(value) and option in @option_names do
+    value = String.trim(value)
+
     if Kino.SmartCell.valid_variable_name?(value) do
       [{:variable, value}]
     else
-      []
+      [{:variable, nil}]
     end
   end
 

mix.exs

@@ -1,7 +1,7 @@
 defmodule KinoExcalidraw.MixProject do
   use Mix.Project
 
-  @version "0.4.0"
+  @version "0.5.0"
   @description "Excalidraw integration with Livebook"
 
   def project do