fix(cli): Handle --version compatible with G_IS_TEST pattern

The previous implementation used argparse's version action which calls
sys.exit(), preventing run() from returning in test mode. Now version
is printed manually and returns None when G_IS_TEST is set, matching
the pattern used when no VCS is found.

Adds tests for --version and -V flags.

Author: tony

src/g/__init__.py

@@ -14,7 +14,7 @@
 
 from g.__about__ import __version__
 
-__all__ = ["DEFAULT", "create_parser", "run", "sys", "vcspath_registry"]
+__all__ = ["DEFAULT", "__version__", "create_parser", "run", "sys", "vcspath_registry"]
 
 vcspath_registry = {".git": "git", ".svn": "svn", ".hg": "hg"}
 
@@ -99,8 +99,10 @@ def run(
     # Handle --version/-V before VCS detection
     assert isinstance(cmd_args, (tuple, list))
     if cmd_args and cmd_args[0] in ("--version", "-V"):
-        parser = create_parser()
-        parser.parse_args(["--version"])  # Will print version and exit
+        print(f"g {__version__}")
+        if os.getenv("G_IS_TEST") and __name__ != "__main__":
+            return None
+        sys.exit(0)
 
     if cmd is DEFAULT:
         cmd = find_repo_type(pathlib.Path.cwd())

tests/test_cli.py

@@ -81,6 +81,18 @@ class CommandLineTestFixture(t.NamedTuple):
         argv_args=["g --help"],
         expect_cmd=None,
     ),
+    CommandLineTestFixture(
+        test_id="g-version-inside-git-dir",
+        env=EnvFlag.Git,
+        argv_args=["g", "--version"],
+        expect_cmd=None,  # Returns None after printing version
+    ),
+    CommandLineTestFixture(
+        test_id="g-version-short-inside-empty-dir",
+        env=EnvFlag.Empty,
+        argv_args=["g", "-V"],
+        expect_cmd=None,
+    ),
 ]
 
 
@@ -120,3 +132,25 @@ def test_command_line(
                 shell=True,
                 stderr=subprocess.STDOUT,
             )
+
+
+def test_version_output(capsys: pytest.CaptureFixture[str]) -> None:
+    """Test that --version prints the correct version string."""
+    from g import __version__, sys as gsys
+
+    with patch.object(gsys, "argv", ["g", "--version"]):
+        result = run()
+        assert result is None
+        captured = capsys.readouterr()
+        assert f"g {__version__}" in captured.out
+
+
+def test_version_short_output(capsys: pytest.CaptureFixture[str]) -> None:
+    """Test that -V prints the correct version string."""
+    from g import __version__, sys as gsys
+
+    with patch.object(gsys, "argv", ["g", "-V"]):
+        result = run()
+        assert result is None
+        captured = capsys.readouterr()
+        assert f"g {__version__}" in captured.out