add version command to show current version

browser_cli/cli.py

@@ -8,6 +8,8 @@ import os
 import json
 import stat
 import shutil
+import re
+from importlib.metadata import PackageNotFoundError, version as package_version
 from pathlib import Path
 from rich.console import Console
 
@@ -53,7 +55,38 @@ def _native_host_script_path() -> Path:
     return _native_host_wrapper_path().with_name("native_host.py")
 
 
+def _project_version() -> str:
+    pyproject_path = Path(__file__).resolve().parent.parent / "pyproject.toml"
+    try:
+        content = pyproject_path.read_text(encoding="utf-8")
+        match = re.search(r'^version\s*=\s*"([^"]+)"', content, re.MULTILINE)
+        if match:
+            return match.group(1)
+    except OSError:
+        pass
+
+    try:
+        return package_version("browser-cli")
+    except PackageNotFoundError:
+        return "unknown"
+
+
+def _print_version(ctx, param, value):
+    if not value or ctx.resilient_parsing:
+        return
+    click.echo(_project_version())
+    ctx.exit()
+
+
 @click.group()
+@click.option(
+    "-V", "--version",
+    is_flag=True,
+    is_eager=True,
+    expose_value=False,
+    callback=_print_version,
+    help="Show the browser-cli version and exit.",
+)
 @click.option(
     "--browser", default=None, metavar="ALIAS",
     help="Browser profile alias to target (required when multiple browsers are active).",

tests/test_cli.py

@@ -0,0 +1,33 @@
+from pathlib import Path
+
+from click.testing import CliRunner
+from unittest.mock import patch
+
+from browser_cli.cli import main, _project_version
+
+
+def _expected_version() -> str:
+    pyproject = Path(__file__).resolve().parent.parent / "pyproject.toml"
+    for line in pyproject.read_text(encoding="utf-8").splitlines():
+        if line.startswith("version = "):
+            return line.split('"')[1]
+    raise AssertionError("version not found in pyproject.toml")
+
+
+def test_short_version_option():
+    result = CliRunner().invoke(main, ["-V"])
+    assert result.exit_code == 0
+    assert result.output.strip() == _expected_version()
+
+
+def test_long_version_option():
+    result = CliRunner().invoke(main, ["--version"])
+    assert result.exit_code == 0
+    assert result.output.strip() == _expected_version()
+
+
+def test_project_version_falls_back_to_installed_package_metadata():
+    with patch("browser_cli.cli.Path.read_text", side_effect=OSError), patch(
+        "browser_cli.cli.package_version", return_value="9.9.9"
+    ):
+        assert _project_version() == "9.9.9"