diff --git a/src/api/window.c b/src/api/window.c
index fb272d3..b4e1998 100644
--- a/src/api/window.c
+++ b/src/api/window.c
@@ -9,6 +9,7 @@ extern SDL_Window *window;
 
 
 static const char *window_opts[] = { "normal", "maximized", "fullscreen", 0 };
+enum { WIN_NORMAL, WIN_MAXIMIZED, WIN_FULLSCREEN };
 
 static int f_get_window_mode(lua_State *L) {
   unsigned flags = SDL_GetWindowFlags(window);
@@ -43,6 +44,15 @@ static int f_get_window_size(lua_State *L) {
   return 2;
 }
 
+static int f_set_window_mode(lua_State *L) {
+  int n = luaL_checkoption(L, 1, "normal", window_opts);
+  SDL_SetWindowFullscreen(window,
+    n == WIN_FULLSCREEN ? SDL_WINDOW_FULLSCREEN_DESKTOP : 0);
+  if (n == WIN_NORMAL) { SDL_RestoreWindow(window); }
+  if (n == WIN_MAXIMIZED) { SDL_MaximizeWindow(window); }
+  return 0;
+}
+
 // does not seem to work on Fedora Gnome Wayland
 // it returns true but visually nothing changes
 // possibly bc the view paints solid?
@@ -77,13 +87,58 @@ static int f_set_window_size(lua_State *L) {
 }
 
 
+static int f_set_window_title(lua_State *L) {
+  const char *title = luaL_checkstring(L, 1);
+  SDL_SetWindowTitle(window, title);
+  return 0;
+}
+
+
+static int f_show_confirm_dialog(lua_State *L) {
+  const char *title = luaL_checkstring(L, 1);
+  const char *msg = luaL_checkstring(L, 2);
+
+#if _WIN32
+  int id = MessageBox(0, msg, title, MB_YESNO | MB_ICONWARNING);
+  lua_pushboolean(L, id == IDYES);
+
+#else
+  SDL_MessageBoxButtonData buttons[] = {
+    { SDL_MESSAGEBOX_BUTTON_RETURNKEY_DEFAULT, 1, "Yes" },
+    { SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT, 0, "No" },
+  };
+  SDL_MessageBoxData data = {
+    .title = title,
+    .message = msg,
+    .numbuttons = 2,
+    .buttons = buttons,
+  };
+  int buttonid;
+  SDL_ShowMessageBox(&data, &buttonid);
+  lua_pushboolean(L, buttonid == 1);
+#endif
+  return 1;
+}
+
+
+static int f_window_has_focus(lua_State *L) {
+  unsigned flags = SDL_GetWindowFlags(window);
+  lua_pushboolean(L, flags & SDL_WINDOW_INPUT_FOCUS);
+  return 1;
+}
+
+
 static const luaL_Reg lib[] = {
-  { "get_mode",          f_get_window_mode     },
-  { "get_position",      f_get_window_position },
-  { "get_size",          f_get_window_size     },
-  { "set_opacity",       f_set_window_opacity  },
-  { "set_position",      f_set_window_position },
-  { "set_size",          f_set_window_size     },
+  { "get_mode",            f_get_window_mode     },
+  { "get_position",        f_get_window_position },
+  { "get_size",            f_get_window_size     },
+  { "set_mode",            f_set_window_mode     },
+  { "set_opacity",         f_set_window_opacity  },
+  { "set_position",        f_set_window_position },
+  { "set_size",            f_set_window_size     },
+  { "set_title",           f_set_window_title    },
+  { "show_confirm_dialog", f_show_confirm_dialog },
+  { "has_focus",           f_window_has_focus    },
   { NULL, NULL }
 };