Git pre-commit hook

pre-commit

#!/bin/sh -x

# Run git config --global core.hooksPath /path/to/hooks

if git rev-parse --verify HEAD >/dev/null 2>&1
then
	against=HEAD
else
	against=$(git hash-object -t tree /dev/null)
fi

changed_files=$(git diff-index --cached $against | \
	grep -E '[MA]	.*\.(c|cpp)$' | cut -f 2)
if [ -n "$changed_files" ]; then
	clang-format -i -style=LLVM $changed_files
	exit $?
fi