chore: import upstream snapshot with attribution

python/mlc_llm/support/argparse.py

@@ -0,0 +1,16 @@
+"""An enhanced argument parser for mlc-chat."""
+
+import argparse
+import sys
+
+
+class ArgumentParser(argparse.ArgumentParser):
+    """An enhanced argument parser for mlc-chat."""
+
+    def error(self, message):
+        """Overrides the behavior when erroring out"""
+        print("-" * 25 + " Usage " + "-" * 25)
+        self.print_help()
+        print("-" * 25 + " Error " + "-" * 25)
+        print(message, file=sys.stderr)
+        sys.exit(2)