Python snippet for make Git releases

manage.py

#!/usr/bin/env python

import re

import git  # gitpython
import semver
import click


@click.group()
def cli():
    """Development CLI"""


@cli.command('release')
@click.argument('file', type=click.File('r+'), required=True)
@click.argument('version', required=True)
@click.option('-d', '--dev', default='dev', help='Develop branch')
@click.option('-m', '--master', default='master', help='Master branch')
def release(dev, master, file, version):
    """Make Git release."""

    content = file.read()
    file.seek(0)

    version_match = re.search(r'__version__ = \'(.*?)\'', content)
    app_version = version_match.group(1) if version_match else None

    if not app_version:
        raise click.ClickException(f'Application version read failed')

    if not semver.match(version, f'>{app_version}'):
        raise click.ClickException(
            f'Version must be greater than {app_version}')

    click.echo(f'Current app version - {app_version}')

    repo = git.Repo()
    release = f'release/{version}'

    click.echo(f'Create {release} branch')
    repo.head.ref = repo.heads[dev]
    repo.head.ref = repo.create_head(release)

    click.echo(f'Bump version - {version}')
    ln = "__version__ = '{0}'"
    file.write(content.replace(ln.format(app_version), ln.format(version)))
    repo.index.add([file.name])
    repo.index.commit(f'bump version - v{version}')

    diff = repo.head.commit.diff(None)

    cf = re.compile(r'^change[s|log].*')
    changelog_files = [d.a_path for d in diff if cf.match(d.a_path.lower())]
    if changelog_files:
        click.echo(f'Commit {", ".join(changelog_files)}')
        repo.index.add(changelog_files)
        repo.index.commit(f'update changelog - v{version}')

    rf = 'readme'
    readme_files = [d.a_path for d in diff if d.a_path.lower().startswith(rf)]
    if readme_files:
        click.echo(f'Commit {", ".join(readme_files)}')
        repo.index.add(readme_files)
        repo.index.commit(f'update readme - v{version}')

    click.echo(f'Merge {release} into {master}')
    repo.head.ref = repo.heads[master]
    parents = (repo.branches[release].commit, repo.branches[master].commit)
    repo.index.commit(f'merge {release}', parent_commits=parents)

    click.echo(f'Create v{version} tag')
    repo.create_tag(f'v{version}')

    click.echo(f'Merge {release} back into {dev}')
    repo.head.ref = repo.heads[dev]
    dev_parents = (repo.branches[release].commit, repo.branches[dev].commit)
    repo.index.commit(f'merge {release} back', parent_commits=dev_parents)

    click.echo(f'Delete {release} branch')
    repo.delete_head(release)


if __name__ == '__main__':
    cli()