EeePub

epub = EeePub.make do
  title       'sample'
  creator     'jugyo'
  publisher   'jugyo.org'
  date        '2010-05-06'
  identifier  'http://example.com/book/foo', :scheme => 'URL'
  uid         'http://example.com/book/foo'

  files ['/path/to/foo.html', '/path/to/bar.html'] # or files [{'/path/to/foo.html' => 'dest/dir'}, {'/path/to/bar.html' => 'dest/dir'}]
  nav [
    {:label => '1. foo', :content => 'foo.html', :nav => [
      {:label => '1.1 foo-1', :content => 'foo.html#foo-1'}
    ]},
    {:label => '1. bar', :content => 'bar.html'}
  ]
end
epub.save('sample.epub')

EeePub::NCX.new(
  :uid => 'xxxx',
  :title => 'sample',
  :nav => [
    {:label => '1. foo', :content => 'foo.html'},
    {:label => '2. bar', :content => 'bar.html'}
  ]
).save(File.join('sample', 'toc.ncx'))

EeePub::OPF.new(
  :title => 'sample',
  :identifier => {:value => '0-0000000-0-0', :scheme => 'ISBN'},
  :manifest => ['foo.html', 'bar.html'],
  :ncx => 'toc.ncx'
).save(File.join('sample', 'content.opf'))

EeePub::OCF.new(
  :dir => 'sample',
  :container => 'content.opf'
).save('sample.epub')

gem install eeepub