Clean-up book from ArchivedBook on hard-delete.

This change also adds a warning to the hard-delete prompt that deleted
books should first be archived if the Kobo Sync feature is enabled.
An alternative would be to keep a permanent record of hard-deleted
book.

cps/editbooks.py

@@ -159,6 +159,7 @@ def delete_book(book_id, book_format):
                 # delete book from Shelfs, Downloads, Read list
                 ub.session.query(ub.BookShelf).filter(ub.BookShelf.book_id == book_id).delete()
                 ub.session.query(ub.ReadBook).filter(ub.ReadBook.book_id == book_id).delete()
+                ub.session.query(ub.ArchivedBook).filter(ub.ReadBook.book_id == book_id).delete()
                 ub.delete_download(book_id)
                 ub.session.commit()
 
@@ -241,6 +242,7 @@ def render_edit_book(book_id):
     return render_title_template('book_edit.html', book=book, authors=author_names, cc=cc,
                                  title=_(u"edit metadata"), page="editbook",
                                  conversion_formats=allowed_conversion_formats,
+                                 config=config,
                                  source_formats=valid_source_formats)
 
 

cps/templates/book_edit.html

@@ -185,8 +185,16 @@
           <span>{{_('Are you really sure?')}}</span>
       </div>
         <div class="modal-body text-center">
+          <p>
             <span>{{_('Book will be deleted from Calibre database')}}</span>
             <span>{{_('and from hard disk')}}</span>
+          </p>
+          {% if config.config_kobo_sync %}
+          <p>
+            <span>{{_('Important Kobo Note: deleted books will remain on any paired Kobo device.')}}</span>
+            <span>{{_('Books must first be archived and the device synced before a book can safely be deleted.')}}</span>
+          </p>
+          {% endif %}
         </div>
 
       <div class="modal-footer">