#!/usr/bin/env bash
set -euo pipefail

if [[ $# -gt 1 ]]; then
  echo "usage: $0 [root]" >&2
  exit 2
fi

if [[ $# -eq 1 ]]; then
  root="$1"
  fixture_mode=true
else
  root="$(git rev-parse --show-toplevel)"
  fixture_mode=false
fi

if [[ ! -d "$root" ]]; then
  echo "not a directory: $root" >&2
  exit 2
fi

root="$(cd "$root" && pwd)"
offenders=()

while IFS= read -r -d '' file; do
  [[ -f "$file" ]] || continue
  case "$file" in
    *.ps1) continue ;;
  esac

  if LC_ALL=C grep -Il $'\r' "$file" >/dev/null; then
    offenders+=("${file#"$root"/}")
  fi
done < <(
  if [[ "$fixture_mode" == true ]]; then
    find "$root" -type f -print0
  else
    git -C "$root" ls-files -z | while IFS= read -r -d '' path; do
      printf '%s\0' "$root/$path"
    done
  fi
)

if (( ${#offenders[@]} )); then
  printf '%s\n' "CRLF line endings detected:" >&2
  printf '%s\n' "${offenders[@]}" >&2
  exit 1
fi