improve version display

Author: 3nids

pum/cli.py

@@ -4,6 +4,7 @@
 import logging
 import sys
 from typing import Any
+import importlib.metadata
 
 import psycopg
 
@@ -298,6 +299,14 @@ def create_parser() -> argparse.ArgumentParser:
         help="Increase output verbosity (e.g. -v, -vv)",
     )
 
+    version = importlib.metadata.version("pum")
+    parser.add_argument(
+        "--version",
+        action="version",
+        version=f"pum {version}",
+        help="Show program's version number and exit."
+    )
+
     subparsers = parser.add_subparsers(
         title="commands", description="valid pum commands", dest="command"
     )