remove bookname.rds file after render_book(new_session = T)

[dongzhuoer]

After you run render_book(new_session = T), there will be a bookname.rds file in the output directory. I think this file is useless after the book is build, so it should be removed to leave a tidy output directory.

[yihui]

It should not be deleted. It is used to store some intermediate metadata (mainly HTML dependencies of HTML widgets).

[dongzhuoer]

But I still don't think it should stay in the project's directory. If it's needed for the book to be read (open by browser), it should be moved to the _book folder. If it's needed for rebuilding the book, it should be moved to the _bookdown_files folder. @yihui

[yihui]

Yes, it can be moved back and forth. I can take a look if you can send a pull request, otherwise I won't have time for this in the foreseeable future. It is a single file after all, and I don't feel the pressure about how it seriously messes up the whole directory. Thanks!

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