Merge pull request #4 from ngirard/5wtcza-codex/add-taskgit---version-command

Add CLI version option

Author: ngirard

src/taskgist/main.py

@@ -139,13 +139,13 @@ def main_cli():
         formatter_class=argparse.RawTextHelpFormatter,
     )
     parser.add_argument(
-        "-v",
         "--version",
-        action="version",
-        version=f"%(prog)s {__version__}",
+        action="store_true",
+        help="Show program's version number and exit",
     )
     parser.add_argument(
         "task",
+        nargs="?",
         type=str,
         help="The task description string, or a file path prefixed with '@:' (e.g., '@:path/to/task.txt').\n"
         'Example: taskgist "Create a new user authentication system"\n'
@@ -154,6 +154,13 @@ def main_cli():
 
     args = parser.parse_args()
 
+    if args.version:
+        print(f"{parser.prog} {__version__}")
+        return
+
+    if args.task is None:
+        parser.error("the following arguments are required: task")
+
     try:
         task_description_content = get_task_description(args.task)
     except FileNotFoundError as e: