Function main

misc/generate_changelog.py:157–206

()

def main() -> None:
    parser = argparse.ArgumentParser(
        description="Generate draft .md changelog for a mypy public release and print it to stdout."
    )
    parser.add_argument("version", help="target mypy version (form X.Y)")
    parser.add_argument(
        "--local", action="store_true", help="use local release branch, not origin"
    )
    args = parser.parse_args()
    version: str = args.version
    local: bool = args.local

    version = version.removeprefix("v")

    if not re.match(r"[0-9]+\.[0-9]+$", version):
        sys.exit(f"error: Release must be of form X.Y (not {version!r})")
    major, minor = (int(component) for component in version.split("."))

    if not local:
        print("Running 'git fetch' to fetch all release branches...")
        subprocess.run(["git", "fetch"], check=True)

    if minor > 0:
        prev_major = major
        prev_minor = minor - 1
    else:
        # For a x.0 release, the previous release is the most recent (x-1).y release.
        all_releases = sorted(find_all_release_branches())
        if (major, minor) not in all_releases:
            sys.exit(f"error: Can't find release branch for {major}.{minor} at origin")
        for i in reversed(range(len(all_releases))):
            if all_releases[i][0] == major - 1:
                prev_major, prev_minor = all_releases[i]
                break
        else:
            sys.exit("error: Could not determine previous release")
    print(f"Generating changelog for {major}.{minor}")
    print(f"Previous release was     {prev_major}.{prev_minor}")

    if local:
        new_branch = f"release-{major}.{minor}"
    else:
        new_branch = f"origin/release-{major}.{minor}"
    old_branch = f"origin/release-{prev_major}.{prev_minor}"

    changes = find_changes_between_releases(old_branch, new_branch)

    print()
    for c in changes:
        print(format_changelog_entry(c))


if __name__ == "__main__":