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#!/usr/bin/python
import re
import sys
import shutil
import subprocess as sp
# Copy this file to .git/hooks if you're not using cmake
minVersion = 17
binary = "clang-format"
# ensure clang-format is there
cf = shutil.which(binary)
if cf is None:
cf = shutil.which(binary + "-" + str(minVersion))
if cf is None:
print("Bailing out, make sure clang-format is installed!")
sys.exit(1)
# ensure it's of sufficient version
args = [binary, "--version"]
test = sp.run(args, stdout=sp.PIPE, stderr=sp.PIPE)
version = str(test.stdout, encoding="utf-8")
regex = r"clang-format version ((?:\d+\.)+[\d+_\+\-a-z]+)"
search = re.search(regex, version)
if not search:
print("Error determining clang-format version, bailing out!")
sys.exit(2)
version = search.group(1).split(".")[0]
if int(version) < minVersion:
print("Too old clang-format version, bailing out!")
sys.exit(3)
# test both the working tree and staged tree
args0 = ["git", binary, "--extensions", "c,cpp,h", "--diff"]
for suffix in "", "--staged":
if suffix: # sp can't handle empty params
args = args0 + [suffix]
else:
args = args0
test = sp.run(args, stdout=sp.PIPE, stderr=sp.STDOUT)
if test.returncode != 0:
print(test.stdout.decode())
print("\nTrying to commit unformatted changes, bailing out!")
print("Use `git clang-format -f {}` to fix it and/or configure your editor to use clang-format!".format(suffix))
sys.exit(3)
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