//// Included in: - user-manual: Extensions: Postprocessor example //// Purpose:: Insert copyright text in the footer. .CopyrightFooterPostprocessor ```ruby class CopyrightFooterPostprocessor < Asciidoctor::Extensions::Postprocessor def process document, output content = (document.attr 'copyright') || 'Copyright Acme, Inc.' if document.basebackend? 'html' replacement = %(<div id="footer-text">\\1<br>\n#{content}\n</div>) output = output.sub(/<div id="footer-text">(.*?)<\/div>/m, replacement) elsif document.basebackend? 'docbook' replacement = %(<simpara>#{content}</simpara>\n\\1) output = output.sub(/(<\/(?:article|book)>)/, replacement) end output end end ``` .Usage ``` Asciidoctor::Extensions.register do postprocessor CopyrightFooterPostprocessor end Asciidoctor.convert_file 'sample-with-copyright-footer.adoc', :safe => :safe ```