You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pdf-converter-custom-chapter-title.rb
    path of file: ./repos/asciidoctor-pdf/docs/modules/extend/examples
    
    the code of the file until where you have to start completion: class PDFConverterCustomChapterTitle < (Asciidoctor::Converter.for 'pdf')
  register_for 'pdf'

  def ink_chapter_title node, title, opts = {}
    move_down cursor * 0.25
    ink_heading title, (opts.merge
    
  def ink_chapter_title node, title, opts = {}
    move_down cursor * 0.25
    ink_heading title, (opts.merge align: :center, text_transform: :uppercase)
    stroke_horizontal_rule 'DDDDDD', line_width: 2
    move_down theme.block_margin_bottom
    theme_font :base do
      layout_prose 'Custom text here, maybe a chapter preamble.'
    end
    start_new_page
  end