module Kindle

Public Instance Methods

add_head_section(doc, title) click to toggle source
# File guides/rails_guides/kindle.rb, line 107
def add_head_section(doc, title)
  head = Nokogiri::XML::Node.new "head", doc
  title_node = Nokogiri::XML::Node.new "title", doc
  title_node.content = title
  title_node.parent = head
  css = Nokogiri::XML::Node.new "link", doc
  css['rel'] = 'stylesheet'
  css['type'] = 'text/css'
  css['href'] = "#{Dir.pwd}/stylesheets/kindle.css"
  css.parent = head
  doc.at("body").before head
end
generate(output_dir, mobi_outfile, logfile) click to toggle source
# File guides/rails_guides/kindle.rb, line 15
def generate(output_dir, mobi_outfile, logfile)
  output_dir = File.absolute_path(output_dir)
  Dir.chdir output_dir do 
    puts "=> Using output dir: #{output_dir}"
    puts "=> Arranging html pages in document order"
    toc = File.read("toc.ncx")
    doc = Nokogiri::XML(toc).xpath("//ncx:content", 'ncx' => "http://www.daisy.org/z3986/2005/ncx/")
    html_pages = doc.select {|c| c[:src]}.map {|c| c[:src]}.uniq
   
    generate_front_matter(html_pages)

    generate_sections(html_pages)

    generate_document_metadata(mobi_outfile)

    puts "Creating MOBI document with kindlegen. This make take a while."
    cmd = "kindlerb . > #{File.absolute_path logfile} 2>&1"
    puts cmd
    system(cmd)
    puts "MOBI document generated at #{File.expand_path(mobi_outfile, output_dir)}"
  end
end
generate_document_metadata(mobi_outfile) click to toggle source
# File guides/rails_guides/kindle.rb, line 86
def generate_document_metadata(mobi_outfile)
  puts "=> Generating _document.yml"
  x = Nokogiri::XML(File.open("rails_guides.opf")).remove_namespaces!
  cover_jpg = "#{Dir.pwd}/images/rails_guides_kindle_cover.jpg"
  cover_gif = cover_jpg.sub(/jpg$/, 'gif')
  puts `convert #{cover_jpg} #{cover_gif}`
  document = {
    'doc_uuid' => x.at("package")['unique-identifier'],
    'title' => x.at("title").inner_text.gsub(/\(.*$/, " v2"),
    'publisher' => x.at("publisher").inner_text,
    'author' => x.at("creator").inner_text,
    'subject' => x.at("subject").inner_text,
    'date' => x.at("date").inner_text,
    'cover' => cover_gif,
    'masthead' => nil,
    'mobi_outfile' => mobi_outfile
  }
  puts document.to_yaml
  File.open("_document.yml", 'w'){|f| f.puts document.to_yaml}
end
generate_front_matter(html_pages) click to toggle source
# File guides/rails_guides/kindle.rb, line 38
def generate_front_matter(html_pages)
  frontmatter = []
  html_pages.delete_if {|x| 
    if x =~ /(toc|welcome|credits|copyright).html/
      frontmatter << x unless x =~ /toc/
      true
    end
  }
  html = frontmatter.map {|x|
    Nokogiri::HTML(File.open(x)).at("body").inner_html
  }.join("\n")

  fdoc = Nokogiri::HTML(html)
  fdoc.search("h3").each do |h3|
    h3.name = 'h4'
  end
  fdoc.search("h2").each do |h2| 
    h2.name = 'h3'
    h2['id'] = h2.inner_text.gsub(/\s/, '-')
  end
  add_head_section fdoc, "Front Matter"
  File.open("frontmatter.html",'w') {|f| f.puts fdoc.to_html}
  html_pages.unshift "frontmatter.html"
end
generate_sections(html_pages) click to toggle source
# File guides/rails_guides/kindle.rb, line 63
def generate_sections(html_pages)
  FileUtils::rm_rf("sections/")
  html_pages.each_with_index do |page, section_idx|
    FileUtils::mkdir_p("sections/%03d" % section_idx)
    doc = Nokogiri::HTML(File.open(page))
    title = doc.at("title").inner_text.gsub("Ruby on Rails Guides: ", '')
    title = page.capitalize.gsub('.html', '') if title.strip == ''
    File.open("sections/%03d/_section.txt" % section_idx, 'w') {|f| f.puts title}
    doc.xpath("//h3[@id]").each_with_index do |h3,item_idx|
      subsection = h3.inner_text
      content = h3.xpath("./following-sibling::*").take_while {|x| x.name != "h3"}.map {|x| x.to_html}
      item = Nokogiri::HTML(h3.to_html + content.join("\n"))
      item_path = "sections/%03d/%03d.html" % [section_idx, item_idx] 
      add_head_section(item, subsection)
      item.search("img").each do |img|
        img['src'] = "#{Dir.pwd}/#{img['src']}"
      end
      item.xpath("//li/p").each {|p| p.swap(p.children); p.remove}
      File.open(item_path, 'w') {|f| f.puts item.to_html}
    end
  end
end