format

#!/bin/sh

set -e

# Determine the script directory and repository root
SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
REPO_ROOT=$(cd "$SCRIPT_DIR/.." && pwd)

# Go to the repository root directory.
cd "$REPO_ROOT"

# clang-format's behavior changes between versions, even given the same
# configuration.
# This project fixes the version (based on the maintainers' setup) and
# occasionally bumps the required version, reformatting everything.
version=14
formatter=clang-format-$version
formatter_options="--style=file -i $*"

find_sources() {
    find binding/ examples/ fuzz/ include/ src/ test/ -type f \( -name '*.h' -o -name '*.cpp' \) "$@"
}

# If the correct version of clang-format is installed, then use it and quit.
if >/dev/null command -v "$formatter"; then
    # shellcheck disable=SC2086
    find_sources -print0 | xargs -0 "$formatter" $formatter_options
    exit
fi

if ! >/dev/null command -v docker; then
    >&2 echo "Neither $formatter nor docker is installed. Unable to format code."
    exit 1
fi

# If they haven't downloaded the clang docker image before, then prompt the
# user before telling docker to download it (it's large).
image=silkeh/clang:$version
if [ "$(docker image ls --quiet $image | wc -l)" -eq 0 ]; then
    printf '%s is not installed. Download docker image %s instead? [Y/n] ' "$formatter" "$image"
    read -r response
    case "$response" in
        y|Y|yes|Yes|YES|'') ;;
        *) exit ;;
    esac
fi

mount_path=/mnt/repo

# File paths passed to the dockerized clang-format need to be relative to
# the repository root and prefixed with the bind mount path.
#
# Non-path arguments (flags) are left alone.
process_arg() {
  case "$1" in
    -*) printf '%s\0' "$1" ;;
    *) printf '%s/%s\0' "$mount_path" "$1" ;;
  esac
}

docker_clang_format() {
    # shellcheck disable=SC2086
    find_sources | while IFS= read -r arg; do
        process_arg "$arg"
    done | xargs -0 \
      docker run \
      --interactive \
      --rm \
      --volume /etc/passwd:/etc/passwd:ro \
      --volume /etc/group:/etc/group:ro \
      --user "$(id -u):$(id -g)" \
      --mount "type=bind,source=$REPO_ROOT,destination=$mount_path" \
      "$image" \
      clang-format $formatter_options
}

docker_clang_format