pre-commit

#!/bin/bash
#
# Copyright (C) Extensible Service Proxy Authors
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
################################################################################
#

ROOT="$(git rev-parse --show-toplevel)"
SKIP="$(git config --bool hooks.clang-format.skip)"

if [[ "${SKIP}" == "true" ]]; then
  echo "Skipping clang-format since it's disabled."
  exit 0
fi

CLANG_FORMAT="$(git config --path hooks.clang-format.path)"
if [[ ! -x "${CLANG_FORMAT}" ]]; then
  CLANG_FORMAT="$(command -v clang-format)"
fi

if [[ ! -x "${CLANG_FORMAT}" ]]; then
  echo "Skipping clang-format: " \
      "\"${CLANG_FORMAT}\" doesn't exists or not executable"
  exit 0
fi

CLANG_FORMAT_VERSION="$(${CLANG_FORMAT} -version | cut -d ' ' -f 3)"
CLANG_FORMAT_VERSION_REQUIRED="3.8"
if ! [[ "${CLANG_FORMAT_VERSION}" =~ "${CLANG_FORMAT_VERSION_REQUIRED}" ]]; then
  echo "Skipping: clang-format ${CLANG_FORMAT_VERSION_REQUIRED} required."
  exit 0
fi

DIRTY_FILES=($(git diff --name-only | grep -E '\.(h|c|cc|proto)$'))
if [[ "${#DIRTY_FILES}" -ne 0 ]]; then
  echo "Found dirty files: ${DIRTY_FILES[@]}"
  echo "stash or add them before commit."
  exit 1
fi

SOURCE_FILES=($(git ls-files | grep -E '\.(h|c|cc|proto)$'))

if [[ "${#SOURCE_FILES}" -ne 0 ]]; then
  pushd "${ROOT}" > /dev/null
  "${CLANG_FORMAT}" -style=Google -i "${SOURCE_FILES[@]}"
  git add "${SOURCE_FILES[@]}"
  echo "Formatted all source codes"
  popd > /dev/null
else
  echo "No source files."
fi

BUILDIFIER="$(which buildifier)"
if [[ -x "${BUILDIFIER}" ]]; then
  ${BUILDIFIER} -showlog -mode=check $(find . -iname BUILD -type f)
else
  echo "Buildifier does not exist"
fi