Class: Asciibook::Builders::PdfBuilder

Inherits:
BaseBuilder show all
Defined in:
lib/asciibook/builders/pdf_builder.rb

Instance Method Summary collapse

Methods inherited from BaseBuilder

#copy_file

Constructor Details

#initialize(book) ⇒ PdfBuilder

Returns a new instance of PdfBuilder.



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# File 'lib/asciibook/builders/pdf_builder.rb', line 4

def initialize(book)
  super
  @dest_dir = File.join(@book.dest_dir, 'pdf')
  @tmp_dir = File.join(@dest_dir, 'tmp')
  @theme_dir = File.join(@book.theme_dir, 'pdf')
  @theme_config = YAML.safe_load(File.read(File.join(@theme_dir, 'config.yml')))
end

Instance Method Details

#build ⇒ Object 



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# File 'lib/asciibook/builders/pdf_builder.rb', line 12

def build
  prepare_workdir
  generate_pages
  copy_assets
  generate_header_footer
  generate_pdf
  clean_workdir
end

#clean_workdir ⇒ Object 



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# File 'lib/asciibook/builders/pdf_builder.rb', line 26

def clean_workdir
  FileUtils.rm_r @tmp_dir
end

#copy_assets ⇒ Object 



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# File 'lib/asciibook/builders/pdf_builder.rb', line 42

def copy_assets
  @book.assets.each do |path|
    copy_file(path, @book.base_dir, @tmp_dir)
  end

  Dir.glob('**/*.{jpb,png,gif,svg,css,js,eot,ttf,woff,woff2}', File::FNM_CASEFOLD, base: @theme_share_dir).each do |path|
    copy_file(path, @theme_share_dir, @tmp_dir)
  end

  Dir.glob('**/*.{jpb,png,gif,svg,css,js,eot,ttf,woff,woff2}', File::FNM_CASEFOLD, base: @theme_dir).each do |path|
    copy_file(path, @theme_dir, @tmp_dir)
  end
end

#generate_header_footer ⇒ Object 



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# File 'lib/asciibook/builders/pdf_builder.rb', line 56

def generate_header_footer
  layout = Liquid::Template.parse <<~EOF
    <!DOCTYPE html>
    <html>
      <head>
        <script>
          function subst() {
              var vars = {};
              var query_strings_from_url = document.location.search.substring(1).split('&');
              for (var query_string in query_strings_from_url) {
                  if (query_strings_from_url.hasOwnProperty(query_string)) {
                      var temp_var = query_strings_from_url[query_string].split('=', 2);
                      vars[temp_var[0]] = decodeURI(temp_var[1]);
                  }
              }
              var css_selector_classes = ['page', 'frompage', 'topage', 'webpage', 'section', 'subsection', 'date', 'isodate', 'time', 'title', 'doctitle', 'sitepage', 'sitepages'];
              for (var css_class in css_selector_classes) {
                  if (css_selector_classes.hasOwnProperty(css_class)) {
                      var element = document.getElementsByClassName(css_selector_classes[css_class]);
                      for (var j = 0; j < element.length; ++j) {
                          element[j].textContent = vars[css_selector_classes[css_class]];
                      }
                  }
              }
          }
        </script>
        <style>
          html, body {
            margin: 0;
            padding: 0;
          }
        </style>
      </head>
      <body onload="subst()">
        {{ content }}
      </body>
    </html>
  EOF

  File.open(File.join(@tmp_dir, 'header.html'), 'w') do |file|
    file.write layout.render('content' => File.read(File.join(@theme_dir, 'header.html')))
  end

  File.open(File.join(@tmp_dir, 'footer.html'), 'w') do |file|
    file.write layout.render('content' => File.read(File.join(@theme_dir, 'footer.html')))
  end
end

#generate_pages ⇒ Object 



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# File 'lib/asciibook/builders/pdf_builder.rb', line 30

def generate_pages
  layout = Liquid::Template.parse(File.read(File.join(@theme_dir, 'layout.html')))
  @book.pages.each do |page|
    File.open(File.join(@tmp_dir, page.path), 'w') do |file|
      file.write layout.render({
        'book' => @book.to_hash,
        'page' => page.to_hash
      })
    end
  end
end

#generate_pdf ⇒ Object 



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# File 'lib/asciibook/builders/pdf_builder.rb', line 104

def generate_pdf
  command = ['wkhtmltopdf']
  command << '--header-html' << File.expand_path('header.html', @tmp_dir)
  command << '--footer-html' << File.expand_path('footer.html', @tmp_dir)
  command << '--margin-top' << @theme_config.fetch('margin_top', 10).to_s
  command << '--margin-left' << @theme_config.fetch('margin_left', 10).to_s
  command << '--margin-right' << @theme_config.fetch('margin_right', 10).to_s
  command << '--margin-bottom' << @theme_config.fetch('margin_bottom', 10).to_s
  command << '--header-spacing' << @theme_config.fetch('header_spacing', 0).to_s
  command << '--footer-spacing' << @theme_config.fetch('footer_spacing', 0).to_s

  if @book.cover_image_path
    prepare_cover
    command << 'cover' << 'cover.html'
  end

  @book.pages.each do |page|
    if page.node.is_a?(Asciidoctor::Section) && page.node.sectname == 'toc'
      prepare_toc_xsl(page)
      command << 'toc' << '--xsl-style-sheet' << 'toc.xsl'
    else
      command << page.path
    end
  end
  filename = "#{@book.basename}.pdf"
  command << filename
  command << { chdir: @tmp_dir }
  system(*command)

  FileUtils.cp File.join(@tmp_dir, filename), @dest_dir
end

#prepare_cover ⇒ Object 



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# File 'lib/asciibook/builders/pdf_builder.rb', line 136

def prepare_cover
  File.open(File.join(@tmp_dir, 'cover.html'), 'w') do |file|
    file.write <<~EOF
      <img src="#{@book.cover_image_path}" />
    EOF
  end
end

#prepare_toc_xsl(page) ⇒ Object 



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# File 'lib/asciibook/builders/pdf_builder.rb', line 144

def prepare_toc_xsl(page)
  File.open(File.join(@tmp_dir, 'toc.xsl'), 'w') do |file|
    file.write Liquid::Template.parse(File.read(File.join(@theme_dir, 'toc.xsl'))).render({
      'book' => @book.to_hash,
      'page' => page.to_hash
    })
  end
end

#prepare_workdir ⇒ Object 



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# File 'lib/asciibook/builders/pdf_builder.rb', line 21

def prepare_workdir
  FileUtils.mkdir_p @tmp_dir
  FileUtils.rm_r Dir.glob("#{@tmp_dir}/*")
end