anchor.diff:  
   === Convert AsciiDoc to PDF
   
  -IMPORTANT: You'll need to the `coderay` gem installed to run this example since it uses the `source-highlighter` attribute with the value of `coderay`.
  -
   Converting to PDF is a simple as running the `asciidoctor-pdf` script using Ruby and passing our AsciiDoc document as the first argument.
   
    $ asciidoctor-pdf basic-example.adoc
  
positive.code: To learn how the theming system works and how to create and apply custom themes, refer to the <<docs/theming-guide.adoc#,Asciidoctor PDF Theme Guide>>.
  You can use the built-in theme files, which you can find in the [file]_data/themes_ directory, as examples.
  
  == Optional scripts
  
  {project-name} also provides a shell script that invokes GhostScript (`gs`) to optimize and compress the generated PDF with minimal impact on quality.
  
negative.code: 
  .Pygments
   $ gem install pygments.rb
   
  IMPORTANT: You'll need to the `coderay` gem installed to run this example since it uses the `source-highlighter` attribute with the value of `coderay`. You can invoke syntax highlighting with coderay by adding the following line at the tom of the document.
  
  :source-highlighter: coderay 
  
  Assuming all the required gems install properly, verify you can run the `asciidoctor-pdf` script:
  
  