Add --version option to show deadcode version

Author: albertas

Diff for: deadcode/__init__.py

@@ -1,6 +1,8 @@
 try:
     import importlib.metadata
+
     __version__ = importlib.metadata.version(__package__ or __name__)
 except ImportError:
     import importlib_metadata
+
     __version__ = importlib_metadata.version(__package__ or __name__)

Diff for: deadcode/actions/parse_arguments.py

@@ -194,6 +194,12 @@ def parse_arguments(args: Optional[List[str]]) -> Args:
         action='store_true',
         default=False,
     )
+    parser.add_argument(
+        '--version',
+        help='Shows deadcode version',
+        action='store_true',
+        default=False,
+    )
 
     parsed_args = parser.parse_args(args).__dict__
 

Diff for: deadcode/cli.py

@@ -1,5 +1,6 @@
 from typing import List, Optional
 
+from deadcode import __version__
 from deadcode.actions.find_python_filenames import find_python_filenames
 from deadcode.actions.find_unused_names import find_unused_names
 from deadcode.actions.fix_or_show_unused_code import fix_or_show_unused_code
@@ -12,6 +13,10 @@
 def main(
     command_line_args: Optional[List[str]] = None,
 ) -> Optional[str]:
+
+    if command_line_args and '--version' in command_line_args:
+        return __version__
+
     args = parse_arguments(command_line_args)
 
     filenames = find_python_filenames(args=args)

Diff for: deadcode/data_types.py

@@ -14,6 +14,7 @@
 class Args:
     fix: bool = False
     verbose: bool = False
+    version: bool = False
     dry: bool = False
     only: Iterable[Pathname] = ()
     paths: Iterable[Pathname] = ()

Diff for: tests/cli_args/test_version.py

@@ -0,0 +1,41 @@
+from deadcode import __version__
+from deadcode.cli import main
+from deadcode.utils.base_test_case import BaseTestCase
+
+
+class TestVersionCliOption(BaseTestCase):
+    def test_show_version(self):
+        self.files = {
+            'foo.py': b"""
+                class UnusedClass:
+                    pass
+
+                print("Dont change this file")""",
+            'bar.py': b"""
+                def unused_function():
+                    pass
+
+                print("Dont change this file")""",
+        }
+
+        result = main('--version'.split())
+
+        self.assertEqual(result, __version__)
+
+    def test_show_version_when_path_provided(self):
+        self.files = {
+            'foo.py': b"""
+                class UnusedClass:
+                    pass
+
+                print("Dont change this file")""",
+            'bar.py': b"""
+                def unused_function():
+                    pass
+
+                print("Dont change this file")""",
+        }
+
+        result = main('. --version'.split())
+
+        self.assertEqual(result, __version__)