calibre: A wrapper function to convert e-books using Calibre
Description
This function calls the command ebook-convert in Calibre
(http://calibre-ebook.com) to convert e-books.
Usage
calibre(input, output, options = "")
Arguments
input
The input filename.
output
The output filename or extension (if only an extenion 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).
options
A character vector of additional options to be passed to
ebook-convert.