Added -v, --version command line option (#273)

* Added -v, --version command line option

* Corrected parsing of -v and --version

* Review corrections

umu/umu_run.py

@@ -63,6 +63,9 @@ def parse_args() -> Namespace | tuple[str, list[str]]:  # noqa: D103
         ),
         formatter_class=RawTextHelpFormatter,
     )
+    parser.add_argument("-v", "--version", action='store_true',
+                        help="show this version and exit"
+    )
     parser.add_argument(
         "--config", help=("path to TOML file (requires Python 3.11+)")
     )
@@ -77,6 +80,18 @@ def parse_args() -> Namespace | tuple[str, list[str]]:  # noqa: D103
         parser.print_help(sys.stderr)
         sys.exit(1)
 
+    # Show version
+    # Need to avoid clashes with later options (for example: wineboot -u)
+    #   but parse_args scans the whole command line.
+    # So look at the first argument and see if we have -v or --version
+    #   in sort of the same way parse_args would.
+    if sys.argv[1].lower().endswith(("--version", "-v")):
+        print(
+            f"umu-launcher version {__version__} ({sys.version})", 
+            file=sys.stderr
+        )
+        sys.exit(0)
+
     # Winetricks
     # Exit if no winetricks verbs were passed
     if sys.argv[1].endswith("winetricks") and not sys.argv[2:]: