[chaley]

Here is a python script that kepubifies epubs in a directory then removes the underlying epub. It is basic, for example missing setting up options.

from calibre.ebooks.oeb.polish.kepubify import kepubify_path
import os

books_dir = sys.argv[1]
for root, dirs, files in os.walk(books_dir):
    for f in files:
        base, ext = os.path.splitext(f)
        if ext == '.epub' and not base.endswith('kepub'):
            infile = os.path.join(root, f)
            outfile = os.path.join(root, base+'.kepub'+ext)
            print(infile, outfile)
            kepubify_path(infile, outfile)
            os.remove(infile)

It is called with

calibre-debug -e kepub.py full_path_to_directory