clang-format.sh

#! /usr/bin/env bash
#
#  Simple wrapper to run clang-format on a bunch of files
#
# Copyright 2021, Verizon Media
# SPDX-License-Identifier: Apache-2.0
#

# Update the PKGDATE with the new version date when making a new clang-format binary package.
PKGDATE="20200514"

function main() {
  set -e # exit on error
  ROOT=${ROOT:-$(cd $(dirname $0) && git rev-parse --show-toplevel)/.git/fmt/${PKGDATE}}

  TOP_LEVEL=`cd $(dirname $0) && git rev-parse --show-toplevel`
  DIR=${@:-"${TOP_LEVEL}/src ${TOP_LEVEL}/tests"}
  PACKAGE="clang-format-${PKGDATE}.tar.bz2"
  VERSION="clang-format version 10.0.0 (https://github.com/llvm/llvm-project.git d32170dbd5b0d54436537b6b75beaf44324e0c28)"

  URL=${URL:-https://ci.trafficserver.apache.org/bintray/${PACKAGE}}

  TAR=${TAR:-tar}
  CURL=${CURL:-curl}

  # default to using native sha1sum command when available
  if [ $(which sha1sum) ] ; then
    SHASUM=${SHASUM:-sha1sum}
  else
    SHASUM=${SHASUM:-shasum}
  fi

  ARCHIVE=$ROOT/$(basename ${URL})

  case $(uname -s) in
  Darwin)
    FORMAT=${FORMAT:-${ROOT}/clang-format/clang-format.osx}
    ;;
  Linux)
    FORMAT=${FORMAT:-${ROOT}/clang-format/clang-format.linux}
    ;;
  *)
    echo "Leif needs to build a clang-format for $(uname -s)"
    exit 2
  esac

  mkdir -p ${ROOT}

  # Note that the two spaces between the hash and ${ARCHIVE) is needed
  if [ ! -e ${FORMAT} -o ! -e ${ROOT}/${PACKAGE} ] ; then
    ${CURL} -L --progress-bar -o ${ARCHIVE} ${URL}
    ${TAR} -x -C ${ROOT} -f ${ARCHIVE}
    cat > ${ROOT}/sha1 << EOF
5eec43e5c7f3010d6e6f37639491cabe51de0ab2  ${ARCHIVE}
EOF
    ${SHASUM} -c ${ROOT}/sha1
    chmod +x ${FORMAT}
  fi


  # Make sure we only run this with our exact version
  ver=$(${FORMAT} --version)
  if [ "$ver" != "$VERSION" ]; then
      echo "Wrong version of clang-format!"
      echo "See https://bintray.com/apache/trafficserver/clang-format-tools/view for a newer version,"
      echo "or alternatively, undefine the FORMAT environment variable"
      exit 1
  else
      echo "Running clang-format. This may take a minute."
      tmp_dir=$(mktemp -d -t tracked-clang-files.XXXXXXXXXX)
      files=${tmp_dir}/clang_files.txt
      start_time_file=${tmp_dir}/format_start.$$
      find $DIR \
        \( -path '*/.venv' -o -path '*/_build' -o -path '*/_destdir' -o -path '*/_scm' \) -prune \
        -o \( -iname \*.[ch] -o -iname \*.cc \) -print > ${files}
      touch ${start_time_file}
      while read -r file; do
        ${FORMAT} -i "$file"
      done < ${files}
      find $(cat ${files}) -newer ${start_time_file}
      rm -rf ${tmp_dir}
      echo "clang-format completed."
  fi
}

if [[ "$(basename -- "$0")" == 'clang-format.sh' ]]; then
  main "$@"
else
  ROOT=${ROOT:-$(git rev-parse --show-toplevel)/.git/fmt/${PKGDATE}}
fi