Allow bump version to be run only once rather than per python-package

[krassowski]

It would be really helpful if we could delegate version bumping to a singular script rather than have it invoked on per-python-package basis. This is especially true if both python packages and npm packages are in a monorepo.

Currently it runs in directory of each package:

jupyter_releaser/jupyter_releaser/cli.py

Lines 377 to 383 in e727e21

	def bump_version(version_spec, version_cmd, changelog_path, python_packages, tag_format):
	"""Prep git and env variables and bump version"""
	prev_dir = os.getcwd()
	for python_package in [p.split(":")[0] for p in python_packages]:
	os.chdir(python_package)
	lib.bump_version(version_spec, version_cmd, changelog_path, tag_format)
	os.chdir(prev_dir)

Maybe we could have a new "single_version_bump" option?

[krassowski]

Both jupyter-collaboration and jupyter-chat would benefit from this.

[krassowski]

Because bump version also tries check if it can create tags for python packages (although these will never be created!), if these have the same version it will fail:

jupyter_releaser/jupyter_releaser/lib.py

Lines 26 to 46 in 897a828

	def bump_version(version_spec, version_cmd, changelog_path, tag_format):
	"""Bump the version and verify new version"""
	util.bump_version(version_spec, version_cmd=version_cmd, changelog_path=changelog_path)
	version = util.get_version()
	# A properly parsed version will have a "major" attribute
	parsed = parse_version(version)
	if util.SETUP_PY.exists() and not hasattr(parsed, "major"):
	msg = f"Invalid version {version}"
	raise ValueError(msg)
	# Bail if tag already exists
	tag_name = tag_format.format(version=version)
	if tag_name in util.run("git --no-pager tag", quiet=True).splitlines():
	msg = f"Tag {tag_name} already exists!"
	msg += " To delete run: `git push --delete origin {tag_name}`"
	raise ValueError(msg)
	return version

Se we need to customize tag_format on per-package basis if there is more than one Python package (or allow to disable pushing tags for all but the top-level metapackage)