This function calls the command ebook-convert
in Calibre
(https://calibre-ebook.com) to convert e-books.
calibre(input, output, options = "")
The input filename.
The output filename or extension (if only an extension is
provided, the output filename will be the input filename with its extension
replaced by output
; for example, calibre('foo.epub', 'mobi')
generates foo.mobi
).
A character vector of additional options to be passed to
ebook-convert
.
The output filename.