Ignore node_modules.command

#!/bin/bash
set -euo pipefail

finish() {
  local status=$?
  trap - EXIT
  if [ "$status" -ne 0 ]; then
    printf '\nCould not mark all generated folders as ignored. See the error above.\n' >&2
  fi
  if [ -t 0 ]; then
    printf '\nPress Return to close this window.'
    read -r _ || true
  fi
  exit "$status"
}
trap finish EXIT

# Resolve the folder containing this command each time, including Finder launches.
project_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
attribute='com.apple.fileprovider.ignore#P'
generated_folders=(
  'node_modules'
  'apps/web/dist'
  'apps/api/dist'
  '.qa'
  'test-results'
  'playwright-report'
)

# npm can install workspace-specific dependencies alongside the shared root ones.
# Vite and Vitest caches inside node_modules are covered by the same attribute.
for workspace in "$project_dir"/apps/* "$project_dir"/packages/*; do
  if [ -f "$workspace/package.json" ]; then
    generated_folders+=("${workspace#"$project_dir"/}/node_modules")
  fi
done

# Check every path before changing any attributes.
# Check parents too, so nested workspace paths cannot follow symbolic links.
for folder in "${generated_folders[@]}"; do
  directory="$project_dir/$folder"
  while [ "$directory" != "$project_dir" ]; do
    if [ -L "$directory" ] || { [ -e "$directory" ] && [ ! -d "$directory" ]; }; then
      printf '%s is not a local directory.\n' "${directory#"$project_dir"/}" >&2
      exit 1
    fi
    directory="${directory%/*}"
  done
done

printf 'Setting Dropbox ignore attributes for LessonLab in:\n%s\n' "$project_dir"
for folder in "${generated_folders[@]}"; do
  directory="$project_dir/$folder"
  # Create missing folders so Dropbox can ignore them before tools populate them.
  mkdir -p "$directory"
  /usr/bin/xattr -w "$attribute" 1 "$directory"
  value="$(/usr/bin/xattr -p "$attribute" "$directory")"
  if [ "$value" != '1' ]; then
    printf 'The Dropbox ignore attribute could not be verified for %s.\n' "$folder" >&2
    exit 1
  fi
  printf '  Verified: %s\n' "$directory"
done

printf '\nLocal files are kept. Dropbox removes the synced copy from the cloud and other devices.\n'
printf 'Run this again if any of these folders are deleted and recreated (for example, by npm ci or a clean build).\n'