feat: first take at UI app

lib/bds/desktop/menu_bar.ex

@@ -0,0 +1,73 @@
+defmodule BDS.Desktop.MenuBar do
+  @moduledoc false
+
+  use Desktop.Menu
+  alias Desktop.Window
+
+  def groups(opts \\ []) do
+    dev_mode? = Keyword.get(opts, :dev_mode?, false)
+
+    [
+      %{id: :app, label: "App", items: [%{id: :about, label: "About"}]},
+      %{id: :file, label: "File", items: [%{id: :new_post, label: "New Post"}, %{id: :close_tab, label: "Close Tab"}]},
+      %{id: :edit, label: "Edit", items: [%{id: :undo, label: "Undo"}, %{id: :redo, label: "Redo"}]},
+      %{id: :view, label: "View", items: view_items(dev_mode?)},
+      %{id: :window, label: "Window", items: [%{id: :minimize, label: "Minimize"}]},
+      %{id: :help, label: "Help", items: [%{id: :documentation, label: "Documentation"}]}
+    ]
+  end
+
+  @impl true
+  def mount(menu) do
+    {:ok,
+     Desktop.Menu.assign(
+       menu,
+       :groups,
+       groups(dev_mode?: Application.get_env(:bds, :dev_routes, false))
+     )}
+  end
+
+  @impl true
+  def render(assigns) do
+    ~H"""
+    <menubar>
+      <%= for group <- @groups do %>
+        <menu label={group.label}>
+          <%= for item <- group.items do %>
+            <item onclick={Atom.to_string(item.id)}>{item.label}</item>
+          <% end %>
+        </menu>
+      <% end %>
+    </menubar>
+    """
+  end
+
+  @impl true
+  def handle_event("quit", menu) do
+    Window.quit()
+    {:noreply, menu}
+  end
+
+  def handle_event(_, menu) do
+    {:noreply, menu}
+  end
+
+  @impl true
+  def handle_info(_, menu) do
+    {:noreply, menu}
+  end
+
+  defp view_items(dev_mode?) do
+    items = [
+      %{id: :toggle_sidebar, label: "Toggle Sidebar"},
+      %{id: :toggle_panel, label: "Toggle Panel"},
+      %{id: :toggle_assistant_sidebar, label: "Toggle Assistant Sidebar"}
+    ]
+
+    if dev_mode? do
+      items ++ [%{id: :toggle_dev_tools, label: "Toggle Dev Tools"}]
+    else
+      items
+    end
+  end
+end