Allow configuring vega embed actions

assets/vega_lite/main.js

@@ -129,7 +129,12 @@ export function init(ctx, data) {
   let theme = config.theme === "livebook" ? livebookTheme : {};
 
   const options = {
-    actions: { export: true, source: false, compiled: false, editor: false },
+    actions: {
+      export: config.export,
+      source: config.view_source,
+      compiled: config.view_compiled_vega,
+      editor: config.open_vega_editor
+    },
     config: theme,
   };
 

lib/kino/vega_lite.ex

@@ -52,6 +52,14 @@ defmodule Kino.VegaLite do
     )
   end
 
+  @default_config [
+    theme: :livebook,
+    export: true,
+    view_source: true,
+    view_compiled_vega: false,
+    open_vega_editor: true
+  ]
+
   @doc """
   Applies global configuration options for the VegaLite kinos.
 
@@ -60,19 +68,42 @@ defmodule Kino.VegaLite do
     * `:theme` - the theme to be applied on the rendered VegaLite
       charts. Currently the only supported theme is `:livebook`. If
       set to `nil`, no theme is applied. Defaults to `:livebook`.
+
+    * `:export` - whether the **Export as SVG/PNG** actions will be
+      enabled on the chart widget. Defaults to `true`.
+
+    * `:view_source` - whether the **View Source** action will be enabled
+      on the chart widget. Defaults to `true`.
+
+    * `:view_compiled_vega` - whether the **View Compiled Vega** action
+      will be enabled on the chart widget. Defaults to `false`.
+
+    * `:open_vega_editor` - whether the **Open in Vega Editor** action
+      will be enabled on the chart widget. Defaults to `true`.
   """
   @spec configure(keyword()) :: :ok
   def configure(opts) do
-    opts = Keyword.validate!(opts, theme: :livebook)
+    opts = Keyword.validate!(opts, @default_config)
 
     unless opts[:theme] in [nil, :livebook] do
       raise ArgumentError,
             "expected :theme to be either :livebook or nil, got: #{inspect(opts[:theme])}"
     end
 
+    for field <- [:export, :view_source, :view_compiled_vega, :open_vega_editor] do
+      validate_boolean!(opts, field)
+    end
+
     Application.put_all_env(kino_vega_lite: opts)
   end
 
+  defp validate_boolean!(opts, field) do
+    unless is_boolean(opts[field]) do
+      raise ArgumentError,
+            "expected #{inspect(field)} to be a boolean, got: #{inspect(opts[field])}"
+    end
+  end
+
   @doc """
   Renders and returns a new kino with the given VegaLite definition.
 
@@ -256,9 +287,7 @@ defmodule Kino.VegaLite do
   end
 
   defp config do
-    default_config = [theme: :livebook]
-
-    default_config
+    @default_config
     |> Keyword.merge(Application.get_all_env(:kino_vega_lite))
     |> Map.new()
   end

test/kino/vega_lite_test.exs

@@ -99,19 +99,49 @@ defmodule Kino.VegaLiteTest do
                  "expected :theme to be either :livebook or nil, got: :invalid",
                  fn -> Kino.VegaLite.configure(theme: :invalid) end
 
-    # with default theme
+    # with invalid value for boolean options
+    for field <- [:export, :view_source, :view_compiled_vega, :open_vega_editor] do
+      message = "expected #{inspect(field)} to be a boolean, got: nil"
+      assert_raise ArgumentError, message, fn -> Kino.VegaLite.configure([{field, nil}]) end
+    end
+
+    # with default values
     kino = start_kino()
 
     data = connect(kino)
-    assert %{config: %{theme: :livebook}} = data
 
-    # with empty theme
-    Kino.VegaLite.configure(theme: nil)
+    assert %{
+             config: %{
+               theme: :livebook,
+               export: true,
+               view_source: true,
+               view_compiled_vega: false,
+               open_vega_editor: true
+             }
+           } = data
+
+    # with updated config
+    Kino.VegaLite.configure(
+      theme: nil,
+      export: false,
+      view_source: false,
+      view_compiled_vega: true,
+      open_vega_editor: false
+    )
 
     kino = start_kino()
 
     data = connect(kino)
-    assert %{config: %{theme: nil}} = data
+
+    assert %{
+             config: %{
+               theme: nil,
+               export: false,
+               view_source: false,
+               view_compiled_vega: true,
+               open_vega_editor: false
+             }
+           } = data
   end
 
   defp start_kino() do