This scripts helps generate one chapter for you to read.
$ ./pdf_picker.py books # list books in progress
$ ./pdf_picker.py add book.pdf # adds book to a library
$ ./pdf_picker.py list # list topics to generate a new chapter
$ ./pdf_picker.py generate python # generate a new chapter by tag "python"
$ ./pdf_picker.py last # opens last generated chapter
$ ./pdf_picker.py clean # removes all generated chapters
$ ./pdf_picker.py finish book.pdf # finish reading a book