Rakefile

namespace :book do
  desc 'build the book'
  task :build do
    puts "Generating EPub..."
    `bundle exec asciidoctor-epub3 -a stem main.asc`
    puts "> Epub output at main.epub"

    puts "Generating Mobi..."
    `bundle exec asciidoctor-epub3 -a stem -a ebook-format=kf8 main.asc`
    puts "> Mobi output at main.mobi"

    puts "Generating PDF..."
    `bundle exec asciidoctor-pdf -a stem main.asc`
    puts "> PDF output at main.pdf"
  end
end

task :default => "book:build"