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).",