command_line refactor

src/util/command_line.cpp

@@ -4,36 +4,45 @@
 
 namespace fs = std::filesystem;
 
+bool perform_keyword(ArgsReader& reader, const std::string& keyword, EnginePaths& paths) {
+    if (keyword == "--res") {
+        auto token = reader.next();
+        if (!fs::is_directory(fs::path(token))) {
+            throw std::runtime_error(token+" is not a directory");
+        }
+        paths.setResources(fs::path(token));
+        std::cout << "resources folder: " << token << std::endl;
+    } else if (keyword == "--dir") {
+        auto token = reader.next();
+        if (!fs::is_directory(fs::path(token))) {
+            fs::create_directories(fs::path(token));
+        }
+        paths.setUserfiles(fs::path(token));
+        std::cout << "userfiles folder: " << token << std::endl;
+    } else if (keyword == "--help" || keyword == "-h") {
+        std::cout << "VoxelEngine command-line arguments:" << std::endl;
+        std::cout << " --res [path] - set resources directory" << std::endl;
+        std::cout << " --dir [path] - set userfiles directory" << std::endl;
+        return false;
+    } else {
+        std::cerr << "unknown argument " << keyword << std::endl;
+        return false;
+    }
+    return true;
+}
+
 bool parse_cmdline(int argc, char** argv, EnginePaths& paths) {
     ArgsReader reader(argc, argv);
     reader.skip();
     while (reader.hasNext()) {
         std::string token = reader.next();
         if (reader.isKeywordArg()) {
-			if (token == "--res") {
+            if (!perform_keyword(reader, token, paths)) {
-				token = reader.next();
-				if (!fs::is_directory(fs::path(token))) {
-					throw std::runtime_error(token+" is not a directory");
-				}
-				paths.setResources(fs::path(token));
-				std::cout << "resources folder: " << token << std::endl;
-			} else if (token == "--dir") {
-				token = reader.next();
-				if (!fs::is_directory(fs::path(token))) {
-					fs::create_directories(fs::path(token));
-				}
-				paths.setUserfiles(fs::path(token));
-				std::cout << "userfiles folder: " << token << std::endl;
-			} else if (token == "--help" || token == "-h") {
-				std::cout << "VoxelEngine command-line arguments:" << std::endl;
-				std::cout << " --res [path] - set resources directory" << std::endl;
-				std::cout << " --dir [path] - set userfiles directory" << std::endl;
                 return false;
-			} else {
-				std::cerr << "unknown argument " << token << std::endl;
             }
         } else {
             std::cerr << "unexpected token" << std::endl;
+            return false;
         }
     }
     return true;