bug#43775: 28.0.50; Feature request: to include EPUB reading into doc-view

[Jean Louis]

Situation is that doc-view can read PDF files, and Libreoffice or Open
Document files, and others, but EPUB files are not included. Many
digital books are made in EPUB format.

Vasilij Schneidermann <mail 📧 vasilij.de> have written the nov-mode
which when aded to auto-mode-list, opens EPUB files

(add-to-list 'auto-mode-alist '("\\.epub\\'" . nov-mode))

I have asked him, he would be somehow willing to cooperate if this is
also confirmed by more users, there are few problems with it, as it
depends on dash.el and other packages.

Maybe doc-view could be expanded with similar feature such as nov-mode
so that it can read EPUB files natively.

I am myself working on project to help local libraries and school
install and use offline Wikipedia, Gutenberg books and similar, there
will be course about Emacs and introduction to computing, EPUB files
are handy. I am each time getting surprised that I cannot read EPUB
files with native Emacs.