Add --version option to gpt-copy CLI command

src/gpt_copy/gpt_copy.py

@@ -3,6 +3,7 @@
 import sys
 from pathlib import Path
 from typing import TextIO
+import importlib.metadata
 
 import click
 import pygit2
@@ -701,6 +702,7 @@ def write_output(
 
 
 @click.command()
+@click.version_option(version=importlib.metadata.version("gpt_copy"))
 @click.argument(
     "root_path",
     type=click.Path(

tests/test_version_option.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+import subprocess
+import importlib.metadata
+import sys
+
+
+def test_version_option_via_console_script():
+    """Test that --version option works when called via the console script."""
+    # Get the expected version from package metadata
+    expected_version = importlib.metadata.version("gpt_copy")
+
+    # Test the --version option via console script
+    result = subprocess.run(
+        ["gpt-copy", "--version"],
+        capture_output=True,
+        text=True
+    )
+
+    # Verify exit code is 0
+    assert result.returncode == 0, f"Expected exit code 0, got {result.returncode}"
+
+    # Verify the output contains the version
+    expected_output = f"gpt-copy, version {expected_version}\n"
+    assert result.stdout == expected_output, f"Expected '{expected_output}', got '{result.stdout}'"
+
+    # Verify stderr is empty
+    assert result.stderr == "", f"Expected empty stderr, got '{result.stderr}'"
+
+
+def test_version_consistent_with_pyproject():
+    """Test that the version matches what's defined in pyproject.toml."""
+    # Get the version from package metadata
+    package_version = importlib.metadata.version("gpt_copy")
+
+    # Read the version from pyproject.toml (simple check)
+    import tomllib
+    from pathlib import Path
+    pyproject_path = Path(__file__).parent.parent / "pyproject.toml"
+
+    with open(pyproject_path, "rb") as f:
+        pyproject_data = tomllib.load(f)
+
+    pyproject_version = pyproject_data["project"]["version"]
+
+    # Verify they match
+    assert package_version == pyproject_version, f"Package version '{package_version}' doesn't match pyproject.toml version '{pyproject_version}'"