tools/cpplint.py-update

#!/usr/bin/env python3
# Copyright 2016 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Helper script to quickly update the bundled cpplint.py script."""

import argparse
import json
from pathlib import Path
import sys
import urllib.request


# Since this is manually run by repohooks developers, we can safely require more
# recent versions of Python.
assert (sys.version_info.major, sys.version_info.minor) >= (3, 9), (
    f"Python 3.9 or newer is required; found {sys.version}")


THIS_FILE = Path(__file__).resolve()
THIS_DIR = THIS_FILE.parent
CPPLINT_PY = THIS_DIR / "cpplint.py"


# The cpplint project.
GITHUB_URL = "https://github.com/cpplint/cpplint/raw"


def download(commit: str) -> str:
    """Download latest cpplint version."""
    url = f"{GITHUB_URL}/{commit}/cpplint.py"
    with urllib.request.urlopen(url, timeout=60) as fp:
        return fp.read()


def munge_content(data: str) -> str:
    """Make changes to |data| for local script usage."""
    lines = data.splitlines()
    if lines[0].endswith(b"python"):
        lines[0] += b"3"
    lines.insert(1, b"# pylint: skip-file")
    return b"\n".join(lines)


def update_script(data: str) -> None:
    """Update the cpplint script."""
    CPPLINT_PY.write_bytes(data)
    CPPLINT_PY.chmod(0o755)


def get_parser() -> argparse.ArgumentParser:
    """Return a command line parser."""
    parser = argparse.ArgumentParser(description=__doc__)
    return parser


def main(argv: list[str]) -> int:
    parser = get_parser()
    opts = parser.parse_args(argv)

    ret = 0

    data = download("develop")
    data = munge_content(data)
    update_script(data)

    return ret


if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))