[nostalgia/studio] Switch file dialog to NFDE and add save file dialog

src/nostalgia/studio/lib/filedialog_nfd.cpp

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2016 - 2022 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#include <nfd.hpp>
+
+#include <ox/std/error.hpp>
+#include <ox/std/string.hpp>
+#include <ox/std/trace.hpp>
+
+#include "filedialog.hpp"
+
+namespace nostalgia::studio {
+
+static ox::Result<ox::String> toResult(nfdresult_t r, const NFD::UniquePathN &path) noexcept {
+	switch (r) {
+		case NFD_OKAY:
+			return ox::String(path.get());
+		case NFD_CANCEL:
+			return OxError(1, "Operation cancelled");
+		default:
+			return OxError(2, NFD::GetError());
+	}
+}
+
+ox::Result<ox::String> saveFile(const ox::Vector<FDFilterItem> &filters) noexcept {
+	NFD::Guard guard;
+	NFD::UniquePathN path;
+	ox::Vector<nfdnfilteritem_t, 5> filterItems(filters.size());
+	for (auto i = 0u; const auto &f : filters) {
+		filterItems[i] = {f.name.c_str(), f.spec.c_str()};
+		++i;
+	}
+	return toResult(NFD::SaveDialog(path, filterItems.data(), filterItems.size()), path);
+}
+
+ox::Result<ox::String> chooseDirectory() noexcept {
+	NFD::Guard guard;
+	NFD::UniquePathN path;
+	return toResult(NFD::PickFolder(path), path);
+}
+
+}