handle UTF-8 command-line paths

src/common/file.cpp

@@ -245,28 +245,33 @@ void File::Printf(const char* format, ...) {
 	Write(s.data(), static_cast<uint32_t>(s.size()));
 }
 
+static std::filesystem::path WithoutTrailingSeparator(
+	const std::filesystem::path& path) {
+		if (!path.empty() && !path.has_filename() &&
+			path != path.root_path()) {
+			return path.parent_path();
+		}
+
+		return path;
+}
+
+
 bool File::IsDirectoryExisting(const std::filesystem::path& path) {
-	auto path_str = PathToGenericString(path);
-	return SysFileIsDirectoryExisting(path_str.ends_with("/") ? Common::RemoveLast(path_str, 1)
-	                                                          : path_str);
+	return SysFileIsDirectoryExisting(WithoutTrailingSeparator(path));
 }
 
 bool File::IsFileExisting(const std::filesystem::path& name) {
 	return SysFileIsFileExisting(name);
 }
 
-bool File::CreateDirectory(
-    const std::filesystem::path& path) // @suppress("Member declaration not found")
-{
-	auto path_str = PathToGenericString(path);
-	return SysFileCreateDirectory(path_str.ends_with("/") ? Common::RemoveLast(path_str, 1)
-	                                                      : path_str);
+bool File::CreateDirectory(const std::filesystem::path& path) {
+    return SysFileCreateDirectory(
+        WithoutTrailingSeparator(path));
 }
 
 bool File::DeleteDirectory(const std::filesystem::path& path) {
-	auto path_str = PathToGenericString(path);
-	return SysFileDeleteDirectory(path_str.ends_with("/") ? Common::RemoveLast(path_str, 1)
-	                                                      : path_str);
+    return SysFileDeleteDirectory(
+        WithoutTrailingSeparator(path));
 }
 
 bool File::CreateDirectories(const std::filesystem::path& path) {

src/common/stringUtils.h

@@ -34,6 +34,23 @@ inline std::string PathToGenericString(const std::filesystem::path& path) {
 #endif
 }
 
+inline std::filesystem::path PathFromUtf8(std::string_view text) {
+#if defined(__cpp_char8_t)
+	std::u8string utf8;
+	utf8.reserve(text.size());
+
+	for (const char ch: text) {
+		utf8.push_back(
+			static_cast<char8_t>(static_cast<unsigned char>(ch))
+		);
+	}
+
+	return std::filesystem::path(utf8);
+#else
+	return std::filesystem::u8path(text.begin(), text.end());
+#endif
+}
+
 inline bool EqualNoCase(std::string_view lhs, std::string_view rhs) {
 	if (lhs.size() != rhs.size()) {
 		return false;