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#!/usr/bin/env python3
# Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "cmake-common" project.
# For details, see https://github.com/egor-tensin/cmake-common.
# Distributed under the MIT License.
'''clang-format all C/C++ files in the project
This script feeds every C/C++ file in the repository to clang-format, either
printing a unified diff between the original and the formatted versions, or
formatting the files in-place.
'''
import argparse
from contextlib import contextmanager
import difflib
import logging
import os
import subprocess
import sys
@contextmanager
def setup_logging():
logging.basicConfig(
format='%(asctime)s | %(levelname)s | %(message)s',
datefmt='%Y-%m-%d %H:%M:%S',
level=logging.INFO)
try:
yield
except Exception as e:
logging.exception(e)
raise
@contextmanager
def cd(path):
cwd = os.getcwd()
os.chdir(path)
try:
yield
finally:
os.chdir(cwd)
def run(cmd_line):
logging.debug('Running executable: %s', cmd_line)
try:
return subprocess.run(cmd_line, check=True, universal_newlines=True,
stderr=subprocess.STDOUT, stdout=subprocess.PIPE)
except subprocess.CalledProcessError as e:
logging.error('Process finished with exit code %d: %s', e.returncode, cmd_line)
logging.error('Its output was:\n%s', e.output)
raise
def read_file(path):
with open(path) as file:
return file.read()
class ClangFormat:
def __init__(self, path, style):
self.path = path
self.style = style
def _get_command_line(self, paths, in_place=False):
cmd_line = [self.path, f'-style={self.style}']
if in_place:
cmd_line.append('-i')
cmd_line.append('--')
cmd_line += list(paths)
return cmd_line
def format_in_place(self, paths):
run(self._get_command_line(paths, in_place=True))
@staticmethod
def _show_diff(path, formatted):
original = read_file(path).split('\n')
formatted = formatted.split('\n')
original_lbl = f'{path} (original)'
formatted_lbl = f'{path} (formatted)'
diff = difflib.unified_diff(original, formatted, fromfile=original_lbl,
tofile=formatted_lbl, lineterm='')
clean = True
for line in diff:
clean = False
print(line)
return clean
def show_diff(self, paths):
clean = True
for path in paths:
formatted = run(self._get_command_line([path])).stdout
clean = self._show_diff(path, formatted) and clean
return clean
def git_root_dir():
cmd_line = ['git', 'rev-parse', '--show-toplevel']
root_dir = run(cmd_line).stdout
if root_dir[-1] != '\n':
raise RuntimeError('git rev-parse --show-toplevel should append a newline?')
return root_dir[:-1]
def list_all_files():
cmd_line = ['git', 'ls-tree', '-r', '-z', '--name-only', 'HEAD']
repo_files = run(cmd_line).stdout
repo_files = repo_files.split('\0')
return repo_files
CPP_FILE_EXTENSIONS = {'.c', '.h', '.cc', '.hh', '.cpp', '.hpp', '.cxx', '.hxx', '.cp', '.c++'}
def list_cpp_files():
for path in list_all_files():
ext = os.path.splitext(path)[1]
if ext in CPP_FILE_EXTENSIONS:
yield path
def process_cpp_files(args):
clang_format = ClangFormat(args.clang_format, args.style)
with cd(git_root_dir()):
cpp_files = list_cpp_files()
if args.in_place:
clang_format.format_in_place(cpp_files)
else:
if not clang_format.show_diff(cpp_files):
sys.exit(1)
DEFAULT_CLANG_FORMAT = 'clang-format'
DEFAULT_STYLE = 'file'
def parse_args(argv=None):
if argv is None:
argv = sys.argv[1:]
parser = argparse.ArgumentParser(
description=__doc__,
formatter_class=argparse.RawDescriptionHelpFormatter)
parser.add_argument('-b', '--clang-format', default=DEFAULT_CLANG_FORMAT,
help='clang-format executable file path')
parser.add_argument('-s', '--style', default=DEFAULT_STYLE,
help='clang-format -style parameter argument')
parser.add_argument('-i', '--in-place', action='store_true',
help='edit the files in-place')
return parser.parse_args(argv)
def main(argv=None):
args = parse_args(argv)
with setup_logging():
process_cpp_files(args)
if __name__ == '__main__':
main()
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