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Diffstat (limited to '.travis_scripts/run-clang-format.py')
| -rwxr-xr-x | .travis_scripts/run-clang-format.py | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/.travis_scripts/run-clang-format.py b/.travis_scripts/run-clang-format.py new file mode 100755 index 0000000..68179aa --- /dev/null +++ b/.travis_scripts/run-clang-format.py @@ -0,0 +1,356 @@ +#!/usr/bin/env python +"""A wrapper script around clang-format, suitable for linting multiple files +and to use for continuous integration. +This is an alternative API for the clang-format command line. +It runs over multiple files and directories in parallel. +A diff output is produced and a sensible exit code is returned. + +NOTE: pulled from https://github.com/Sarcasm/run-clang-format, which is +licensed under the MIT license. +""" + +from __future__ import print_function, unicode_literals + +import argparse +import codecs +import difflib +import fnmatch +import io +import multiprocessing +import os +import signal +import subprocess +import sys +import traceback + +from functools import partial + +try: + from subprocess import DEVNULL # py3k +except ImportError: + DEVNULL = open(os.devnull, "wb") + + +DEFAULT_EXTENSIONS = 'c,h,C,H,cpp,hpp,cc,hh,c++,h++,cxx,hxx' + + +class ExitStatus: + SUCCESS = 0 + DIFF = 1 + TROUBLE = 2 + + +def list_files(files, recursive=False, extensions=None, exclude=None): + if extensions is None: + extensions = [] + if exclude is None: + exclude = [] + + out = [] + for file in files: + if recursive and os.path.isdir(file): + for dirpath, dnames, fnames in os.walk(file): + fpaths = [os.path.join(dirpath, fname) for fname in fnames] + for pattern in exclude: + # os.walk() supports trimming down the dnames list + # by modifying it in-place, + # to avoid unnecessary directory listings. + dnames[:] = [ + x for x in dnames + if + not fnmatch.fnmatch(os.path.join(dirpath, x), pattern) + ] + fpaths = [ + x for x in fpaths if not fnmatch.fnmatch(x, pattern) + ] + for f in fpaths: + ext = os.path.splitext(f)[1][1:] + if ext in extensions: + out.append(f) + else: + out.append(file) + return out + + +def make_diff(file, original, reformatted): + return list( + difflib.unified_diff( + original, + reformatted, + fromfile='{}\t(original)'.format(file), + tofile='{}\t(reformatted)'.format(file), + n=3)) + + +class DiffError(Exception): + def __init__(self, message, errs=None): + super(DiffError, self).__init__(message) + self.errs = errs or [] + + +class UnexpectedError(Exception): + def __init__(self, message, exc=None): + super(UnexpectedError, self).__init__(message) + self.formatted_traceback = traceback.format_exc() + self.exc = exc + + +def run_clang_format_diff_wrapper(args, file): + try: + ret = run_clang_format_diff(args, file) + return ret + except DiffError: + raise + except Exception as e: + raise UnexpectedError('{}: {}: {}'.format(file, e.__class__.__name__, + e), e) + + +def run_clang_format_diff(args, file): + try: + with io.open(file, 'r', encoding='utf-8') as f: + original = f.readlines() + except IOError as exc: + raise DiffError(str(exc)) + invocation = [args.clang_format_executable, file] + + # Use of utf-8 to decode the process output. + # + # Hopefully, this is the correct thing to do. + # + # It's done due to the following assumptions (which may be incorrect): + # - clang-format will returns the bytes read from the files as-is, + # without conversion, and it is already assumed that the files use utf-8. + # - if the diagnostics were internationalized, they would use utf-8: + # > Adding Translations to Clang + # > + # > Not possible yet! + # > Diagnostic strings should be written in UTF-8, + # > the client can translate to the relevant code page if needed. + # > Each translation completely replaces the format string + # > for the diagnostic. + # > -- http://clang.llvm.org/docs/InternalsManual.html#internals-diag-translation + # + # It's not pretty, due to Python 2 & 3 compatibility. + encoding_py3 = {} + if sys.version_info[0] >= 3: + encoding_py3['encoding'] = 'utf-8' + + try: + proc = subprocess.Popen( + invocation, + stdout=subprocess.PIPE, + stderr=subprocess.PIPE, + universal_newlines=True, + **encoding_py3) + except OSError as exc: + raise DiffError( + "Command '{}' failed to start: {}".format( + subprocess.list2cmdline(invocation), exc + ) + ) + proc_stdout = proc.stdout + proc_stderr = proc.stderr + if sys.version_info[0] < 3: + # make the pipes compatible with Python 3, + # reading lines should output unicode + encoding = 'utf-8' + proc_stdout = codecs.getreader(encoding)(proc_stdout) + proc_stderr = codecs.getreader(encoding)(proc_stderr) + # hopefully the stderr pipe won't get full and block the process + outs = list(proc_stdout.readlines()) + errs = list(proc_stderr.readlines()) + proc.wait() + if proc.returncode: + raise DiffError( + "Command '{}' returned non-zero exit status {}".format( + subprocess.list2cmdline(invocation), proc.returncode + ), + errs, + ) + return make_diff(file, original, outs), errs + + +def bold_red(s): + return '\x1b[1m\x1b[31m' + s + '\x1b[0m' + + +def colorize(diff_lines): + def bold(s): + return '\x1b[1m' + s + '\x1b[0m' + + def cyan(s): + return '\x1b[36m' + s + '\x1b[0m' + + def green(s): + return '\x1b[32m' + s + '\x1b[0m' + + def red(s): + return '\x1b[31m' + s + '\x1b[0m' + + for line in diff_lines: + if line[:4] in ['--- ', '+++ ']: + yield bold(line) + elif line.startswith('@@ '): + yield cyan(line) + elif line.startswith('+'): + yield green(line) + elif line.startswith('-'): + yield red(line) + else: + yield line + + +def print_diff(diff_lines, use_color): + if use_color: + diff_lines = colorize(diff_lines) + if sys.version_info[0] < 3: + sys.stdout.writelines((l.encode('utf-8') for l in diff_lines)) + else: + sys.stdout.writelines(diff_lines) + + +def print_trouble(prog, message, use_colors): + error_text = 'error:' + if use_colors: + error_text = bold_red(error_text) + print("{}: {} {}".format(prog, error_text, message), file=sys.stderr) + + +def main(): + parser = argparse.ArgumentParser(description=__doc__) + parser.add_argument( + '--clang-format-executable', + metavar='EXECUTABLE', + help='path to the clang-format executable', + default='clang-format') + parser.add_argument( + '--extensions', + help='comma separated list of file extensions (default: {})'.format( + DEFAULT_EXTENSIONS), + default=DEFAULT_EXTENSIONS) + parser.add_argument( + '-r', + '--recursive', + action='store_true', + help='run recursively over directories') + parser.add_argument('files', metavar='file', nargs='+') + parser.add_argument( + '-q', + '--quiet', + action='store_true') + parser.add_argument( + '-j', + metavar='N', + type=int, + default=0, + help='run N clang-format jobs in parallel' + ' (default number of cpus + 1)') + parser.add_argument( + '--color', + default='auto', + choices=['auto', 'always', 'never'], + help='show colored diff (default: auto)') + parser.add_argument( + '-e', + '--exclude', + metavar='PATTERN', + action='append', + default=[], + help='exclude paths matching the given glob-like pattern(s)' + ' from recursive search') + + args = parser.parse_args() + + # use default signal handling, like diff return SIGINT value on ^C + # https://bugs.python.org/issue14229#msg156446 + signal.signal(signal.SIGINT, signal.SIG_DFL) + try: + signal.SIGPIPE + except AttributeError: + # compatibility, SIGPIPE does not exist on Windows + pass + else: + signal.signal(signal.SIGPIPE, signal.SIG_DFL) + + colored_stdout = False + colored_stderr = False + if args.color == 'always': + colored_stdout = True + colored_stderr = True + elif args.color == 'auto': + colored_stdout = sys.stdout.isatty() + colored_stderr = sys.stderr.isatty() + + version_invocation = [args.clang_format_executable, str("--version")] + try: + subprocess.check_call(version_invocation, stdout=DEVNULL) + except subprocess.CalledProcessError as e: + print_trouble(parser.prog, str(e), use_colors=colored_stderr) + return ExitStatus.TROUBLE + except OSError as e: + print_trouble( + parser.prog, + "Command '{}' failed to start: {}".format( + subprocess.list2cmdline(version_invocation), e + ), + use_colors=colored_stderr, + ) + return ExitStatus.TROUBLE + + retcode = ExitStatus.SUCCESS + files = list_files( + args.files, + recursive=args.recursive, + exclude=args.exclude, + extensions=args.extensions.split(',')) + + if not files: + return + + njobs = args.j + if njobs == 0: + njobs = multiprocessing.cpu_count() + 1 + njobs = min(len(files), njobs) + + if njobs == 1: + # execute directly instead of in a pool, + # less overhead, simpler stacktraces + it = (run_clang_format_diff_wrapper(args, file) for file in files) + pool = None + else: + pool = multiprocessing.Pool(njobs) + it = pool.imap_unordered( + partial(run_clang_format_diff_wrapper, args), files) + while True: + try: + outs, errs = next(it) + except StopIteration: + break + except DiffError as e: + print_trouble(parser.prog, str(e), use_colors=colored_stderr) + retcode = ExitStatus.TROUBLE + sys.stderr.writelines(e.errs) + except UnexpectedError as e: + print_trouble(parser.prog, str(e), use_colors=colored_stderr) + sys.stderr.write(e.formatted_traceback) + retcode = ExitStatus.TROUBLE + # stop at the first unexpected error, + # something could be very wrong, + # don't process all files unnecessarily + if pool: + pool.terminate() + break + else: + sys.stderr.writelines(errs) + if outs == []: + continue + if not args.quiet: + print_diff(outs, use_color=colored_stdout) + if retcode == ExitStatus.SUCCESS: + retcode = ExitStatus.DIFF + return retcode + + +if __name__ == '__main__': + sys.exit(main())
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