#!/usr/bin/env python3

# Copyright 2023 Google Inc. All Rights Reserved.
#
# 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.

"""Runs clang-format on all relevant C++/JavaScript files in the repository."""

import argparse
from internal import find_files_for_linting
import os.path
import subprocess
import sys

FILE_MASKS = ['*.cc', '*.h', '*.js']
FORMAT_OPTIONS = [
  '--style=Chromium',
  # TODO(emaxx): Consider reenabling this, now that we don't use <> includes for
  # the headers maintained in this project.
  '--sort-includes=false',
]
CHECK_ONLY_OPTIONS = ['--dry-run', '-Werror']

def parse_command_line_args():
  parser = argparse.ArgumentParser(
      description='Runs clang-format on C++/JS files in the repository.')
  parser.add_argument(
      '--base', type=str, default='main',
      help='Git ref to diff against, or "none" if the whole repository is to '
           'be reformatted (default: %(default)s)')
  parser.add_argument(
      '--check-only', action='store_true',
      help='When specified, files are only checked for formatting, but no '
           'edits are made automatically. Non-zero exit code will indicate at '
           'least one formatting issue.')
  return parser.parse_args()

def get_file_paths(args):
  return find_files_for_linting.find_files_for_linting(
      patterns=FILE_MASKS, diff_base=args.base)

def run_clang_format(path, args):
  command = ['clang-format', '-i'] + FORMAT_OPTIONS
  if args.check_only:
    command += CHECK_ONLY_OPTIONS
  command += [path]
  return subprocess.call(command) == 0

def main():
  args = parse_command_line_args()
  paths = get_file_paths(args)
  return 0 if all([run_clang_format(path, args) for path in paths]) else 1

if __name__ == '__main__':
  sys.exit(main())