EPUB Maker

This library supports making and editing EPUB books

Installation

Add this line to your application's Gemfile:

gem 'epub-maker'

And then execute:

$ bundle

Or install it yourself as:

$ gem install epub-maker

Usage

Library

require 'epub/maker'

EPUB::Maker.make path/to/generated/book.epub do |book|
  book.make_ocf do |ocf|
    ocf.make_container do |container|
      container.make_rootfile full_path: 'OPS/content.opf'
    end
  end

  book.make_package do |package|
    package.dir = 'rtl'

    package.make_metadata do |metadata|
      metadata.title = 'Sample eBook'
      metadata.language = 'ja'
    end

    package.make_manifest do |manifest|
      Pathname.glob("#{@fixture_dir}/OPS/*.{xhtml,xml}").each_with_index do |content_path, index|
        manifest.make_item do |item|
          item.id = "item-#{index + 1}"
          href = content_path.relative_path_from(@fixture_dir + File.dirname(book.rootfile_path))
          item.href = Addressable::URI.parse(href.to_s)
          item.media_type = case content_path.extname
                            when '.xhtml' then 'application/xhtml+xml'
                            when '.png' then 'image/png'
                            end
          item.content_file = (@fixture_dir + item.entry_name).to_path
          item.properties << 'nav' if content_path.basename.to_path == 'nav.xhtml'
        end
      end

      package.make_spine do |spine|
        spine.page_progression_direction = 'rtl'

        package.manifest.items.select(&:xhtml?).each do |item|
          spine.make_itemref do |itemref|
            itemref.item = item
            itemref.linear = true
          end
        end
      end
    end
  end
end

For structure of EPUB book, see EPUB Parser's documentation.

In-place editing

require 'epub/maker'

book = EPUB::Parser.parse('path/to/book.epub')
book.resources.select(&:xhtml?).each do |item|
  doc = item.content_document.nokogiri
  title = doc/'title'
  title.content += ' - Additional Title such like book title'
  item.content = doc.to_xml
  item.save
end

Shortcut:

book.resources.select(&:xhtml?).each do |item|
  item.edit_with_nokogiri do |doc| # Nokogiri::XML::Document is passed to block
    doc.search('img').each do |img|
      img['alt'] = '' if img['alt'].nil?
    end
  end # item.content = doc.to_xml is called automatically
end # item.save is called automatically

For APIs of parsed EPUB book, see EPUB Parser's documentation.

Rake task

CAUTION: Still work in progress. File path to require and API will be modified in the future.

require 'epub/maker/task'

DIR = 'path/to/dir/holding/contents'
EPUB_FILE = DIR + '.epub'
EPUB::Maker::Task.new EPUB_FILE do |task|
  task.titles = ['EPUB Maker Rake Example']

  task.base_dir = DIR

  task.files.include "#{task.base_dir}/**/*"
  task.files.exclude {|entry| ! File.file? entry}

  task.rootfile = "#{DIR}/OPS/contents.opf"
  task.make_rootfiles = true

  task.resources = task.files.dup
  task.resources.exclude /\.opf/
  task.resources.exclude /META\-INF/

  task.navs.include 'OPS/nav.xhtml'
  task.media_types = {"#{DIR}/OPS/slideshow.xml" => 'application/x-demo-slideshow'}

  task.spine = task.resources.dup
  task.spine.exclude /OPS\/impl\.xhtml\z/
  task.spine.exclude /\.xml\z/

  task.bindings = {'application/x-demo-slideshow' => "#{DIR}/OPS/impl.xhtml"}
end

epub-archive command

epub-archive command archives given directory as an EPUB file like epzip gem but doesn't require zip command.

% ls path/to
book
% epub-archie path/to/book
% ls path/to
book
book.epub

You can specify target file path.

% epub-archive source/dir/book target/dir/book.epub
% ls source/dir
book
% ls target/dir
book.epub

It also has Ruby API.

require 'epub/maker'

EPUB::Maker.archive 'path/to/book' # => #<Pathname:path/to/book.epub>
EPUB::Maker.archive 'source/dir/book', 'target/dir/book.epub' # => #<Pathname:target/dir/book.epub>

Requirements

• Ruby 2.2 or later
• C compiler to build Nokogiri gems

Todo

• Encode filenames as UTF-8 on adding them to package
• Refine Rake task
  • Autodetection of media types
• Makable from directory/package document file
• EPUB::Maker.archive: don't copy files to temporary directory

Recent Changes

0.1.8

• Add adapter for Rubyzip

0.1.7

• Remove version specification from Nokogiri to migrate to Ruby 3.1

0.1.6

• [BUG FIX]Add mtime keyword argument to OCF::PhysicalContainer::Zipruby#write

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Merge Request