Write settings to nvs when changing from the setting screen

Otherwise, settings may not actually be saved if the device crashes/
reboots unexpectedly.

Fixes #148

1 files changed, 39 insertions, 0 deletions

diff --git a/src/tangara/lua/lua_nvs.cpp b/src/tangara/lua/lua_nvs.cpp
new file mode 100644
index 00000000..e38e58d9
--- /dev/null
+++ b/src/tangara/lua/lua_nvs.cpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2024 Clayton Craft <clayton@craftyguy.net>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "lua/lua_version.hpp"
+
+#include "lua.hpp"
+#include "lua/bridge.hpp"
+
+#include "lua.h"
+#include "lua/lua_thread.hpp"
+
+namespace lua {
+
+[[maybe_unused]] static constexpr char kTag[] = "lua_nvs";
+
+static auto write(lua_State* L) -> int {
+  Bridge* instance = Bridge::Get(L);
+  instance->services().nvs().Write();
+
+  return 1;
+}
+
+static const struct luaL_Reg kNvsFuncs[] = {{"write", write},
+                                             {NULL, NULL}};
+
+static auto lua_nvs(lua_State* L) -> int {
+  luaL_newlib(L, kNvsFuncs);
+  return 1;
+}
+
+auto RegisterNvsModule(lua_State* L) -> void {
+  luaL_requiref(L, "nvs", lua_nvs, true);
+  lua_pop(L, 1);
+}
+
+}  // namespace lua