[nostalgia/studio] Add ability to index and list files of different types in Project

src/nostalgia/studio/lib/project.hpp

@@ -6,14 +6,13 @@
 
 #include <memory>
 
-#include <ox/claw/claw.hpp>
 #include <ox/claw/read.hpp>
 #include <ox/claw/write.hpp>
+#include <ox/event/signal.hpp>
 #include <ox/fs/fs.hpp>
 #include <ox/mc/mc.hpp>
 #include <ox/model/descwrite.hpp>
-#include <ox/event/signal.hpp>
-#include <ox/std/std.hpp>
+#include <ox/std/hashmap.hpp>
 
 #include "nostalgiastudio_export.h"
 
@@ -29,6 +28,15 @@ enum class ProjectEvent {
 	FileUpdated,
 };
 
+[[nodiscard]]
+constexpr ox::Result<ox::String> fileExt(auto path) noexcept {
+	const auto extStart = std::find(path.crbegin(), path.crend(), '.').offset();
+	if (!extStart) {
+		return OxError(1, "Cannot open a file without valid extension.");
+	}
+	return path.substr(extStart + 1);
+}
+
 [[nodiscard]]
 ox::String filePathToName(const ox::String &path, const ox::String &prefix, const ox::String &suffix) noexcept;
 
@@ -36,6 +44,7 @@ class NOSTALGIASTUDIO_EXPORT Project {
 	private:
 		ox::String m_path = "";
 		mutable ox::FileSystem *m_fs = nullptr;
+		ox::HashMap<ox::String, ox::Vector<ox::String>> m_fileExtFileMap;
 
 	public:
 		explicit Project(ox::FileSystem *fs, const ox::String &path) noexcept;
@@ -63,7 +72,12 @@ class NOSTALGIASTUDIO_EXPORT Project {
 		template<typename Functor>
 		ox::Error subscribe(ProjectEvent e, ox::SignalHandler *tgt, Functor &&slot) const noexcept;
 
+		[[nodiscard]]
+		const ox::Vector<ox::String> &fileList(const char *ng) noexcept;
+
 	private:
+		void buildFileIndex() noexcept;
+
 		ox::Error writeBuff(const ox::String &path, const ox::Buffer &buff) const noexcept;
 
 		ox::Result<ox::Buffer> loadBuff(const ox::String &path) const noexcept;
@@ -96,8 +110,8 @@ ox::Error Project::writeObj(const ox::String &path, auto *obj) const noexcept {
 	// replace garbage last character with new line
 	typeOut.back().value = '\n';
 	// write to FS
-	ox::String descPath = "/.nostalgia/type_descriptors/";
-	const auto typePath = descPath + type->typeName;
+	static constexpr auto descPath = "/.nostalgia/type_descriptors/";
+	const auto typePath = ox::sfmt("{}{}", descPath, type->typeName);
 	oxReturnError(mkdir(descPath));
 	oxReturnError(writeBuff(typePath, typeOut));
 	fileUpdated.emit(path);
@@ -121,8 +135,8 @@ ox::Error Project::subscribe(ProjectEvent e, ox::SignalHandler *tgt, Functor &&s
 			break;
 		case ProjectEvent::FileRecognized:
 		{
-			oxRequire(fileList, listFiles());
-			for (auto f : fileList) {
+			oxRequire(files, listFiles());
+			for (auto f : files) {
 				slot(f);
 			}
 			connect(this, &Project::fileRecognized, tgt, slot);