ADF scan loop until empty via shell

Hi

How can I loop scan via paperwork-shell until the feeder is empty?

Expected usecase example:

1. Put n papers in ADF
2. Run script
3. Targetfolder contains n new documents

Something similar to scanimage --batch

Excerpt from man scanimage

−batch−count count specifies the number of pages to attempt to scan. If not given, scanimage will continue scanning until the scanner returns a state other than OK. Not all scanners with document feeders signal when the ADF is empty, use this command to work around them.

@jflesch Thank you for such a useful application