added missing files (part 2)

src/util/command_line.cpp

@@ -0,0 +1,46 @@
+#include "command_line.h"
+
+#include <filesystem>
+
+namespace fs = std::filesystem;
+
+using std::filesystem::path;
+using std::string;
+using std::cout;
+using std::cerr;
+using std::endl;
+
+bool parse_cmdline(int argc, char** argv, EnginePaths& paths) {
+	ArgsReader reader(argc, argv);
+	reader.skip();
+	while (reader.hasNext()) {
+		string token = reader.next();
+		if (reader.isKeywordArg()) {
+			if (token == "--res") {
+				token = reader.next();
+				if (!fs::is_directory(path(token))) {
+					throw std::runtime_error(token+" is not a directory");
+				}
+				paths.setResources(path(token));
+				cout << "resources folder: " << token << std::endl;
+			} else if (token == "--dir") {
+				token = reader.next();
+				if (!fs::is_directory(path(token))) {
+					fs::create_directories(path(token));
+				}
+				paths.setUserfiles(path(token));
+				cout << "userfiles folder: " << token << endl;
+			} else if (token == "--help" || token == "-h") {
+				cout << "VoxelEngine command-line arguments:" << endl;
+				cout << " --res [path] - set resources directory" << endl;
+				cout << " --dir [path] - set userfiles directory" << endl;
+				return false;
+			} else {
+				cerr << "unknown argument " << token << endl;
+			}
+		} else {
+			cerr << "unexpected token" << endl;
+		}
+	}
+	return true;
+}