Move splitting code to batch process

I am looking at uploading several hundreds of books with hundreds of pages in each book.

Can you please update the code to do this?

Thank you for flagging an interest in this feature.

The feature request is more than three years old and I agree that having this would be nice. However, it is not a high priority, so it is unlikely it will happen soon unless 1) someone provides a ready-to-roll patch for this; or 2) somebody sponsors the development of this feature.

(I am changing version for this to D7 since this is the latest version of the module. Any new development will be based upon the D7 version.)