[costis]

I love that you have implemented readability options (Gunning Fog Index / Flesch-Kincaid Grade).

For language learning the following ideas for implementation would be great:
1. Count the unique words in an e-book.
2. Count how many unique words are different between certain e-book combinations.

These ideas help language learning with the following.
First, I know I will not meet a lot of unknown words in my next book. Second, I know I will not spend too much time studying a book with only a few new unknown words or, in contrast, too many, making the reading of an e-book painful.

Right now, I do these with the help of ebook-convert and bash scripts but it'd be nice to see them in calibre.
Is there a git page for this plugin? I'm new to the calibre ecosystem hence the question.