module Kindle - rails-4.2.3 Documentation

# 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 %x`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