#!/bin/sh

project_folder=$(git rev-parse --show-toplevel)
if git rev-parse --verify HEAD >/dev/null 2>&1
then
	against=HEAD
else
	# Initial commit: diff against an empty tree object
	against=$(git hash-object -t tree /dev/null)
fi

# Redirect output to stderr.
exec 1>&2

tmpdir=$(mktemp -d repo-XXXXXXXX)
trap "rm -rf $tmpdir" EXIT INT

modified_files=$(git diff --cached --name-only --diff-filter=AM $against | sed -nE "/.*\.(cpp|cc|cxx|c|h|hpp)$/p")
FAIL=0
for file in $modified_files; do
  echo "Checking $file..."

  cp $project_folder/.clang-format $project_folder/.clang-tidy $tmpdir

  git checkout-index --prefix="$tmpdir/" -- $file

  # Do not break header checker
  echo "Running header checker..."
  $project_folder/tools/header-checker.py $tmpdir/$file $file --amend-year
  CODE=$?
  if [ $CODE -ne 0 ]; then
    FAIL=1
  fi
done;

return ${FAIL}