getBookCover function

BinaryFile getBookCover(List<ManifestItem> manifestItems, List<BinaryFile> images)

Retrieves the cover of the book from the provided manifest items and images.

The function first tries to find a manifest item with the property 'cover-image' or an id containing 'cover'. If such an item is found, it then tries to find an image with a path that contains the path of the cover item. If no cover item or corresponding image is found, it returns an empty BinaryFile.

manifestItems is the list of manifest items to search for the cover item. images is the list of images to search for the cover image.

Returns a BinaryFile representing the cover of the book.

Implementation

BinaryFile getBookCover(
  final List<ManifestItem> manifestItems,
  final List<BinaryFile> images,
) {
  final coverItem = manifestItems.firstWhereOrNull(
    (final item) => item.id.contains('cover'),
  );

  return coverItem == null
      ? BinaryFile.empty()
      : images.firstWhere(
          (final image) => image.path.contains(coverItem.path),
          orElse: BinaryFile.empty,
        );
}