fix: add --version flag to CLI

[abhijeetnardele24-hash]

Adds a global --version flag using a Typer callback while keeping the existing version subcommand. Also adds CLI tests for both entrypoints.

Closes #3

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[Copilot]

Pull request overview

Adds a global --version flag to the parsemux Typer CLI (while keeping the existing version subcommand), and introduces CLI tests to verify both entrypoints output the expected version string.

Changes:

• Add an eager --version option via @app.callback() and centralize version printing in _print_version().
• Reuse _print_version() in the existing version subcommand to keep output consistent.
• Add CLI tests covering parsemux version and parsemux --version.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/parsemux/cli/main.py	Adds global --version handling via Typer callback and refactors version printing into a helper.
tests/test_cli.py	Adds tests asserting both the version command and --version flag print parsemux {__version__}.

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[Copilot]

The _version_callback is annotated/used like it returns None, but Click/Typer callbacks can replace the option value with the callback’s return. When --version is not provided, this callback currently returns None, which can cause the version parameter in main() (typed as bool) to receive None at runtime. Consider either returning value from the callback (and annotating it accordingly), or changing the option to Optional[bool] = typer.Option(None, ...) (Typer’s common pattern for eager version flags).

Suggested change

	def _version_callback(value: bool) -> None:
	"""Handle the global --version flag."""
	if value:
	_print_version()
	raise typer.Exit()
	def _version_callback(value: bool) -> bool:
	"""Handle the global --version flag."""
	if value:
	_print_version()
	raise typer.Exit()
	return value

[Copilot]

This new test file doesn’t follow the existing tests’ module header convention (module docstring + from __future__ import annotations). For consistency with the rest of the suite (e.g., tests/test_api.py:1-4, tests/test_router.py:1-4), consider adding those at the top of this file as well.

[kiyeonjeon21]

LGTM! Clean implementation.

• is_eager=True callback pattern is the correct Typer approach
• Good refactor extracting _print_version() to share with the subcommand
• Tests cover both --version and version subcommand

Merging. Thanks for the first contribution @abhijeetnardele24-hash!