Class: Bookmaker::Parser::Epub

Inherits:
Base
  • Object
show all
Defined in:
lib/bookmaker/parser/epub.rb

Instance Attribute Summary

Attributes inherited from Base

#root_dir, #source

Instance Method Summary collapse

Methods inherited from Base

#config, #entries, #initialize, #name, parse, #read_content, #render_template, #spawn_command

Constructor Details

This class inherits a constructor from Bookmaker::Parser::Base

Instance Method Details

#assets ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 97

def assets
  @assets ||= begin
    assets = Dir[root_dir.join("templates/epub/*.css")]
    assets += Dir[root_dir.join("images/**/*.{jpg,png,gif}")]
    assets
  end
end

#cover_image ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 105

def cover_image
  path = Dir[root_dir.join("images/cover.{jpg,png,gif}").to_s].first
  return File.basename(path) if path && File.exist?(path)
end

#cover_page ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 41

def cover_page
  Dir[root_dir.join("templates/epub/cover.html")]
end

#epub ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 14

def epub; @epub ||= EeePub.make ;end

#epub_path ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 127

def epub_path
  root_dir.join("output/#{name}.epub")
end

#html ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 15

def html; @html ||= Nokogiri::HTML(html_path.read); end

#html_path ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 123

def html_path
  root_dir.join("output/#{name}.html")
end

#navigation ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 110

def navigation
  sections.map do |section|
    {
      :label => section.html.css("h2:first-of-type").text,
      :content => section.filename
    }
  end
end

#parse ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 16

def parse
  puts "-- Exporting EPUB"
  epub.title        config["title"]
  epub.language     config["language"]
  epub.creator      config["authors"].to_sentence
  epub.publisher    config["publisher"]
  epub.date         config["published_at"]
  epub.uid          config["uid"]
  epub.identifier   config["identifier"]["id"], :scheme => config["identifier"]["type"]
  if cover_image.nil?
    puts "   - Consider adding a cover images in /images."
  else
    epub.cover      cover_image
  end
  write_sections!
  write_toc!
  epub.files    cover_page + sections.map(&:filepath) + assets
  epub.nav      navigation
  
  epub.save(epub_path)
  true
rescue Exception
  p $!, $@
  false
end

#render_chapter(content) ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 92

def render_chapter(content)
  locals = config.merge(:content => content)
  render_template(template_path, locals)
end

#sections ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 4

def sections
  @sections ||= html.css("div.chapter").each_with_index.map do |chapter, index|
    OpenStruct.new({
      :index    => index,
      :filename => "section_#{index}.html",
      :filepath => tmp_dir.join("section_#{index}.html").to_s,
      :html     => Nokogiri::HTML(chapter.inner_html)
    })
  end
end

#template_path ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 119

def template_path
  root_dir.join("templates/epub/page.erb")
end

#tmp_dir ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 131

def tmp_dir
  root_dir.join("output/tmp")
end

#toc_path ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 135

def toc_path
  tmp_dir.join("toc.html")
end

#write_sections! ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 51

def write_sections!
  # First we need to get all ids, which are used as
  # the anchor target.
  links = sections.inject({}) do |buffer, section|
    section.html.css("[id]").each do |element|
      anchor = "##{element["id"]}"
      buffer[anchor] = "#{section.filename}#{anchor}"
    end

    buffer
  end

  # Then we can normalize all links and
  # manipulate other paths.
  #
  sections.each do |section|
    section.html.css("a[href^='#']").each do |link|
      href = link["href"]
      link.set_attribute("href", links.fetch(href, href))
    end

    # Replace all srcs.
    #
    section.html.css("[src]").each do |element|
      src = File.basename(element["src"]).gsub(/\.svg$/, ".png")
      element.set_attribute("src", src)
      element.set_attribute("alt", "")
      element.node_name = "img"
    end

    FileUtils.mkdir_p(tmp_dir)

    # Save file to disk.
    #
    File.open(section.filepath, "w") do |file|
      body = section.html.css("body").to_xhtml.gsub(%r[<body>(.*?)</body>]m, "\\1")
      file << render_chapter(body)
    end
  end
end

#write_toc! ⇒ Object 



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# File 'lib/bookmaker/parser/epub.rb', line 44

def write_toc!
  toc = TOC::Epub.new(navigation)
  File.open(toc_path, "w") do |file|
    file << toc.to_html
  end
end