tools/pre-commit

#!/bin/bash
# Owner: gchips-productivity-team@google.com
# VERSION: 2019-12-16
# Pre commit hook to auto format code using git clang-format

# change the default style to Google
git config --global clangformat.style Google

# default PRE_COMMIT_CLANG_FORMAT to true
PRE_COMMIT_CLANG_FORMAT="${PRE_COMMIT_CLANG_FORMAT:-true}"

check_clang_format() {
  if ! [ -x "$(command -v clang-format)" ]; then
    echo "Warning: clang-format not found.  Unable to format source code before commit. Please check go/clang-format-setup for setup instructions."
  fi
}

if [ "$PRE_COMMIT_CLANG_FORMAT" = true ] ; then
  check_clang_format
  FILES=$(git clang-format)
  counter=0
  for file in $FILES ; do
    if [[ -f "$file" ]]; then
      git add ${file}
      echo -e "[Info] Changes in ${file} have been formatted"
      ((counter++))
    fi
  done

  if ((  counter > 0 )); then
    echo "[Info] $counter file(s) have been formatted"
    # Track Usage
    MY_PATH=${PWD//\//"%2F"}
    curl "https://us-central1-si-sw-eng-prod-team.cloudfunctions.net/trackAutoFormatUsage?user=${USER}&pwd=${MY_PATH}&timestamp=$(date +%s)&type=FORMAT&filesFormatted=${counter}" > /dev/null 2>&1
  fi

fi

# Run google's default pre-commit
if [ -x /usr/lib/git-core/google_hook ]; then
  /usr/lib/git-core/google_hook pre-commit "$@"
else
  echo 'warning: Cannot run /usr/lib/git-core/google_hook.' \
    'If this is unexpected, please file a go/git-bug' >&2
fi