[nostalgia] Add NewMenu for creating new files

src/nostalgia/studio/lib/itemmaker.hpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2016 - 2022 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#pragma once
+
+#include <ox/claw/claw.hpp>
+
+#include <nostalgia/core/context.hpp>
+
+namespace nostalgia::studio {
+
+class ItemMaker {
+	public:
+		const ox::String name;
+		const ox::String parentDir;
+		const ox::String fileExt;
+		constexpr explicit ItemMaker(ox::String pName, ox::String pParentDir, ox::String pFileExt) noexcept:
+			name(std::move(pName)),
+			parentDir(std::move(pParentDir)),
+			fileExt(std::move(pFileExt)) {
+		}
+		virtual ~ItemMaker() noexcept = default;
+		virtual ox::Error write(core::Context *ctx, const char *pName) const noexcept = 0;
+};
+
+template<typename T>
+class ItemMakerT: public ItemMaker {
+	private:
+		const T item;
+		const ox::ClawFormat fmt;
+	public:
+		constexpr explicit ItemMakerT(ox::String pDisplayName, ox::String pParentDir, ox::String fileExt, ox::ClawFormat pFmt = ox::ClawFormat::Metal) noexcept:
+			ItemMaker(std::move(pDisplayName), std::move(pParentDir), std::move(fileExt)),
+			fmt(pFmt) {
+		}
+		constexpr ItemMakerT(ox::String pDisplayName, ox::String pParentDir, ox::String fileExt, const T &pItem, ox::ClawFormat pFmt) noexcept:
+			ItemMaker(std::move(pDisplayName), std::move(pParentDir), std::move(fileExt)),
+			item(pItem),
+			fmt(pFmt) {
+		}
+		constexpr ItemMakerT(ox::String pDisplayName, ox::String pParentDir, T &&pItem, ox::ClawFormat pFmt) noexcept:
+			ItemMaker(std::move(pDisplayName), std::move(pParentDir), std::move(fileExt)),
+			item(std::forward(pItem)),
+			fmt(pFmt) {
+		}
+		ox::Error write(core::Context *ctx, const char *pName) const noexcept override {
+			const auto path = ox::sfmt("{}/{}.{}", parentDir, pName, fileExt);
+			auto sctx = core::applicationData<studio::StudioContext>(ctx);
+			return sctx->project->writeObj(path, &item, fmt);
+		}
+};
+
+}