command -v(--version) support. ast typeName method now returns magic_enum::enum_name

src/main.cpp

@@ -71,7 +71,12 @@ int main(int argc, char **argv)
 {
     argparse::ArgumentParser program("Fig Interpreter", Fig::Core::VERSION.data());
     program.add_argument("source")
-        .help("source file to be interpreted");
+        .help("source file to be interpreted")
+        .default_value(std::string(""));
+    program.add_argument("-v", "--version")
+        .help("get the version of Fig Interpreter")
+        .default_value(false)
+        .implicit_value(true);
     // interpreter
 
     try
@@ -83,8 +88,17 @@ int main(int argc, char **argv)
         std::cerr << e.what() << '\n';
         return 1;
     }
-
+    if (program.get<bool>("--version"))
+    {
+        std::print("Fig Interpreter version {}\n", Fig::Core::VERSION);
+        return 0;
+    }
     Fig::FString sourcePath(program.get<std::string>("source"));
+    if (sourcePath.empty())
+    {
+        std::cerr << "No source file provided.\n";
+        return 1;
+    }
     std::ifstream file(sourcePath.toBasicString());
     if (!file.is_open())
     {