ci(check): add clang-format in check stage

GitOrigin-RevId: 25c24d78563d250741db0a6b28b4522f5500a0f2

dnn/src/cuda/cub/.clang-format

+DisableFormat: true
+SortIncludes: false

tools/format.py

+#!/usr/bin/env python3
+# This file is part of MegBrain.
+# Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
+import argparse
+import os
+import re
+import subprocess
+import tempfile
+from functools import partial
+from multiprocessing import Manager
+
+from tqdm.contrib.concurrent import process_map
+
+# change workspace to MegBrain root dir
+os.chdir(os.path.join(os.path.dirname(os.path.abspath(__file__)), ".."))
+
+failed_files = Manager().list()
+
+
+def process_file(file, clang_format, write):
+    source = open(file, "r").read()
+    source = re.sub(r"MGB_DEFINE(?P<r>(.|\n)*?)// +{", "class MGB_DEFINE\g<r>{", source)
+
+    result = subprocess.check_output(
+        [
+            clang_format,
+            "-style=file",
+            "-verbose",
+            "-assume-filename={}".format(file),
+            # file,
+        ],
+        input=bytes(source.encode("utf-8")),
+    )
+
+    result = result.decode("utf-8")
+    result = re.sub(r"class MGB_DEFINE((.|\n)*?){", r"MGB_DEFINE\1// {", result)
+
+    if write:
+        with tempfile.NamedTemporaryFile(
+            dir=os.path.dirname(file), delete=False
+        ) as tmp_file:
+            tmp_file.write(result.encode("utf-8"))
+        os.rename(tmp_file.name, file)
+    else:
+        ret_code = subprocess.run(
+            ["diff", "--color=always", file, "-"], input=bytes(result.encode("utf-8")),
+        ).returncode
+
+        # man diff: 0 for same, 1 for different, 2 if trouble.
+        if ret_code == 2:
+            raise RuntimeError("format process (without overwrite) failed")
+        if ret_code != 0:
+            print(file)
+            global failed_files
+            failed_files.append(file)
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Format source files using clang-format, eg: `./tools/format.py src -w`. \
+        Require clang-format version == 12.0",
+        formatter_class=argparse.ArgumentDefaultsHelpFormatter,
+    )
+
+    parser.add_argument(
+        "path", nargs="+", help="file name or path based on MegBrain root dir."
+    )
+    parser.add_argument(
+        "-w",
+        "--write",
+        action="store_true",
+        help="use formatted file to replace original file.",
+    )
+    parser.add_argument(
+        "--clang-format",
+        default=os.getenv("CLANG_FORMAT", "clang-format"),
+        help="clang-format executable name; it can also be "
+        "modified via the CLANG_FORMAT environment var",
+    )
+    args = parser.parse_args()
+
+    format_type = [".cpp", ".c", ".h", ".cu", ".cuh", ".inl"]
+
+    def getfiles(path):
+        rst = []
+        for p in os.listdir(path):
+            p = os.path.join(path, p)
+            if os.path.isdir(p):
+                rst += getfiles(p)
+            elif (
+                os.path.isfile(p)
+                and not os.path.islink(p)
+                and os.path.splitext(p)[1] in format_type
+            ):
+                rst.append(p)
+        return rst
+
+    files = []
+    for path in args.path:
+        if os.path.isdir(path):
+            files += getfiles(path)
+        elif os.path.isfile(path):
+            files.append(path)
+        else:
+            raise ValueError("Invalid path {}".format(path))
+
+    process_map(
+        partial(process_file, clang_format=args.clang_format, write=args.write,),
+        files,
+        chunksize=10,
+    )
+
+    if failed_files:
+        raise RuntimeError("above files are not properly formatted!")
+
+
+if __name__ == "__main__":
+    main()