bin/find-clang-format.py

   1 #!/usr/bin/env python3
   2
   3 # This file is part of the LibreOffice project.
   4 #
   5 # This Source Code Form is subject to the terms of the Mozilla Public
   6 # License, v. 2.0. If a copy of the MPL was not distributed with this
   7 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8
   9 import os
  10 from difflib import unified_diff
  11 from pathlib import Path
  12 from subprocess import PIPE, Popen
  13
  14 EXCLUDELIST = Path("solenv/clang-format/excludelist")
  15 THRESHOLD = os.getenv("CLANG_THRESHOLD", 5)
  16 CLANG_BINARY = Path(os.getenv("CLANG_FORMAT", "/opt/lo/bin/clang-format"))
  17
  18
  19 def calculate_diff_size(diff):
  20     additions, removals = 0, 0
  21     # ignore first 2 item in the sequence
  22     # which are +++ and ---
  23     for line in diff[2:]:
  24         if line.startswith("+"):
  25             additions += 1
  26         elif line.startswith("-"):
  27             removals += 1
  28     return max((additions, removals))
  29
  30
  31 def format_stream(path, *extra_args):
  32     process = Popen(
  33         [CLANG_BINARY, *extra_args], stdout=PIPE, stderr=PIPE, stdin=PIPE,
  34     )
  35     stdout, stderr = process.communicate(input=path.read_bytes())
  36     if stderr:
  37         print("<FAIL>", str(path))
  38         print(stderr.decode())
  39         print("<FAIL>")
  40         exit(1)
  41     stdout = stdout.decode()
  42     return stdout
  43
  44
  45 def main(*args):
  46     if not CLANG_BINARY.exists():
  47         print("Couldn't find clang-format on {!s}".format(CLANG_BINARY))
  48         exit(1)
  49
  50     for path in EXCLUDELIST.read_text().splitlines():
  51         path = Path(path)
  52         if not path.exists():
  53             continue
  54
  55         original = path.read_text()
  56         new = format_stream(path, *args)
  57         originalsize = len(original.splitlines())
  58         diff = unified_diff(original.splitlines(), new.splitlines(), n=0)
  59         diffsize = calculate_diff_size(tuple(diff))
  60         if diffsize <= (originalsize * 5) // 100:
  61             print(path, "(size: {}/{})".format(diffsize, originalsize))
  62
  63
  64 if __name__ == "__main__":
  65     import sys
  66
  67     main(*sys.argv[1:])