feat: first take at UI app

lib/bds/ui/menu_bar.ex

@@ -0,0 +1,41 @@
+defmodule BDS.UI.MenuBar do
+  @moduledoc false
+
+  alias BDS.UI.Workbench
+
+  def default_groups(opts \\ []) do
+    dev_mode? = Keyword.get(opts, :dev_mode?, false)
+
+    [
+      %{id: :app, items: [%{id: :about}, %{id: :settings}]},
+      %{id: :file, items: [%{id: :new_post}, %{id: :new_page}, %{id: :close_tab}]},
+      %{id: :edit, items: [%{id: :undo}, %{id: :redo}]},
+      %{id: :view, items: view_items(dev_mode?)},
+      %{id: :window, items: [%{id: :minimize}, %{id: :zoom}]},
+      %{id: :help, items: [%{id: :documentation}, %{id: :api_documentation}]}
+    ]
+  end
+
+  def execute(state, :toggle_sidebar), do: Workbench.toggle_sidebar(state)
+  def execute(state, :toggle_panel), do: Workbench.toggle_panel(state)
+  def execute(state, :toggle_assistant_sidebar), do: Workbench.toggle_assistant_sidebar(state)
+
+  def execute(state, :close_tab) do
+    case state.active_tab do
+      {type, id} -> Workbench.close_tab(state, type, id)
+      nil -> state
+    end
+  end
+
+  def execute(state, _command_id), do: state
+
+  defp view_items(dev_mode?) do
+    base = [
+      %{id: :toggle_sidebar},
+      %{id: :toggle_panel},
+      %{id: :toggle_assistant_sidebar}
+    ]
+
+    if dev_mode?, do: base ++ [%{id: :toggle_dev_tools}], else: base
+  end
+end