added --version CLI option

scripts/packme

@@ -14,7 +14,7 @@ import sys
 
 from typing import List
 
-from packme import Packman
+from packme import Packman, __version__
 
 class NotSudo(Exception):
     pass
@@ -47,6 +47,11 @@ def clean_templates_dir(templates_base_dir: str):
         except PermissionError:
             raise NotSudo("Only sudoers can remove packer_cache directory")
 
+def show_version():
+
+    print(__version__)
+
+
 def parse_args() -> argparse.Namespace:
     """Returns the argument namespace after command-line parsing.
     """
@@ -55,6 +60,7 @@ def parse_args() -> argparse.Namespace:
     parser.add_argument("--log", "-l", dest="log", action="store_true", help="log packer output")
     parser.add_argument("--key-rate", "-k", dest="key_rate", default="10", help="rate for automatic key entering (in ms)")
     parser.add_argument("--clean", "-c", dest="clean", action="store_true", help="clean up templates directories")
+    parser.add_argument("--version", "-v", dest="version", action="store_true", help="show package version")
     parser.add_argument("--debug", "-d", dest="debug", action="store_true", help="debug mode (keep temporary files)")
     parser.add_argument("--run", "-r", dest="run", action="store_true", help="run packer after json manifest(s) generation")
     parser.add_argument("--templates-base-dir", "-t", dest="templates_base_dir", required=True, help="Templates base directory")
@@ -75,10 +81,15 @@ if __name__ == "__main__":
     packages_base_dir : str = args.packages_base_dir
     selected_templates : List[str] = args.selected_templates
     clean : bool = args.clean
+    version : bool = args.version
     debug : bool= args.debug
     log : bool = args.log
     key_rate : int = int(args.key_rate)
 
+    if version:
+        show_version()
+        sys.exit(0)
+
     # If --clean option is set, cleanup the templates dir (builds, packer_cache, manifest.json files and directories)
     if clean:
         clean_templates_dir(templates_base_dir)