Added version flag to base tool

pyproject.toml

@@ -54,6 +54,9 @@ tc_make_release = "tctools.make_release.__main__:main_argv"
 [tool.poetry-dynamic-versioning]
 enable = true
 
+[tool.poetry-dynamic-versioning.substitution]
+files = ["src/tctools/__init__.py"]
+
 # ----------- Other tools -----------
 
 [tool.black]

src/tctools/common.py

@@ -7,6 +7,8 @@
 
 from lxml import etree
 
+from . import __version__
+
 try:
     import tomllib
 except ImportError:
@@ -87,6 +89,9 @@ def get_argument_parser(cls) -> ArgumentParser:
     @classmethod
     def set_arguments(cls, parser):
         """Create application-specific arguments."""
+        parser.add_argument(
+            "--version", "-V", action="version", version="%(prog)s " + __version__
+        )
         parser.add_argument(
             "--dry",
             help="Do not modify files on disk, only report changes to be made",

tests/test_common.py

@@ -1,4 +1,6 @@
 from pathlib import Path
+import sys
+import subprocess
 
 import pytest  # noqa
 
@@ -48,6 +50,15 @@ def test_cli_arguments_default(self):
         tool = MyTool()
         assert tool.args.my_option == "default-text"
 
+    def test_cli_version(self, capsys):
+        with pytest.raises(SystemExit) as err:
+            _ = MyTool("--version")
+
+        assert err.type == SystemExit
+
+        message = capsys.readouterr().out
+        assert message
+
     def test_config_file(self, tmp_path, monkeypatch):
         conf_dir = tmp_path / "project"
         work_dir = conf_dir / "subdir1" / "subdir2"