Use the new syntax highligther API to resolve stylesheets

templates/document.html.slim

@@ -9,6 +9,7 @@ html lang=(attr :lang, 'en' unless attr? :nolang)
     - unless (asset_uri_scheme = (attr 'asset-uri-scheme', 'https')).empty?
       - asset_uri_scheme = %(#{asset_uri_scheme}:)
     - cdn_base = %(#{asset_uri_scheme}//cdnjs.cloudflare.com/ajax/libs)
+    - linkcss = attr? 'linkcss'
     - [:description, :keywords, :author, :copyright].each do |key|
       - if attr? key
         meta name=key content=(attr key)
@@ -46,19 +47,8 @@ html lang=(attr :lang, 'en' unless attr? :nolang)
           TeX: {#{eqnums_opt}}
           });
       script src='#{cdn_base}/mathjax/2.4.0/MathJax.js?config=TeX-MML-AM_HTMLorMML'
-    - case document.attr 'source-highlighter'
-    - when 'coderay'
-      - if (attr 'coderay-css', 'class') == 'class'
-        - if @safe >= Asciidoctor::SafeMode::SECURE || (attr? :linkcss)
-          link rel='stylesheet' href=normalize_web_path('asciidoctor-coderay.css', (attr :stylesdir, ''))
-        - else
-          style=Asciidoctor::Stylesheets.instance.coderay_stylesheet_data
-    - when 'pygments'
-      - if (attr 'pygments-css', 'class') == 'class'
-        - if @safe >= Asciidoctor::SafeMode::SECURE || (attr? :linkcss)
-          link rel='stylesheet' href=normalize_web_path('asciidoctor-pygments.css', (attr :stylesdir, ''))
-        - else
-          style=Asciidoctor::Stylesheets.instance.pygments_stylesheet_data(attr 'pygments-style')
+    - if (syntax_hl = document.syntax_highlighter) && (syntax_hl.docinfo? :head)
+      =(syntax_hl.docinfo :head, node, linkcss: linkcss)
     / For syntax highlighting
     - if attr? 'highlightjs-theme'
       link href=(attr 'highlightjs-theme') rel="stylesheet"
@@ -246,3 +236,5 @@ html lang=(attr :lang, 'en' unless attr? :nolang)
       });
     - unless (docinfo_content = (docinfo :footer, '.html')).empty?
       =docinfo_content
+    - if syntax_hl && (syntax_hl.docinfo? :footer)
+      =(syntax_hl.docinfo :footer, node, cdn_base_url: cdn_base, linkcss: linkcss, self_closing_tag_slash: '')