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# Copyright (c) 2020 Egor Tensin <egor@tensin.name>
# 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
import difflib
import os
import sys
from project import utils
import project.version
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):
utils.run_capture(self._get_command_line(paths, in_place=True))
@staticmethod
def _show_diff(path, formatted):
original = utils.read_file(path)
if original and not formatted:
# Assuming this file is ignored in .clang-format-ignore.
return True
original = original.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 = utils.run_capture(self._get_command_line([path]))
clean = self._show_diff(path, formatted) and clean
return clean
def git_root_dir():
cmd_line = ["git", "rev-parse", "--show-toplevel"]
root_dir = utils.run_capture(cmd_line)
if root_dir[-1] != "\n":
raise RuntimeError("git rev-parse --show-toplevel should append a newline?")
return root_dir[:-1]
def list_git_files():
cmd_line = ["git", "ls-tree", "-r", "-z", "--name-only", "HEAD"]
repo_files = utils.run_capture(cmd_line)
repo_files = repo_files.split("\0")
return repo_files
def list_all_files():
return (utils.normalize_path(path) for path in list_git_files())
def excluded(path, exclude):
for entry in exclude:
if entry == os.path.commonpath((path, entry)):
return True
return False
def filter_files(paths, exclude):
if not exclude:
return paths
return (path for path in paths if not excluded(path, exclude))
CPP_FILE_EXTENSIONS = set(
(".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].lower()
if ext in CPP_FILE_EXTENSIONS:
yield path
DEFAULT_VERSION = "clang-format"
DEFAULT_STYLE = "file"
def do_format(
version=DEFAULT_VERSION, style=DEFAULT_STYLE, in_place=False, exclude=None
):
clang_format = ClangFormat(version, style)
with utils.cd(git_root_dir()):
cpp_files = filter_files(list_cpp_files(), exclude)
if in_place:
clang_format.format_in_place(cpp_files)
return 0
return 0 if clang_format.show_diff(cpp_files) else 1
def parse_args(argv=None):
if argv is None:
argv = sys.argv[1:]
parser = argparse.ArgumentParser(
description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter
)
project.version.add_to_arg_parser(parser)
parser.add_argument(
"-b",
"--clang-format",
dest="version",
default=DEFAULT_VERSION,
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"
)
parser.add_argument(
"-e",
"--exclude",
nargs="*",
type=utils.normalize_path,
help="files or directories to exclude",
)
return parser.parse_args(argv)
def main(argv=None):
args = parse_args(argv)
with utils.setup_logging():
return do_format(**vars(args))
if __name__ == "__main__":
sys.exit(main())
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