Disable highlight.js for code processed by Hugo's hl

layouts/partials/reveal-hugo/slides.html

@@ -4,6 +4,9 @@
   {{- if ne (len .Content) 0 -}}
     <!-- Remove the <hr /> tag generated by blackfriday for footnotes -->
     {{- $content := replace .Content "<div class=\"footnotes\">\n\n<hr />" "<div class=\"footnotes\">" -}}
+    <!-- <code> blocks processed by Hugo's highlighter have a data-lang attribute. For those, we disable -->
+    <!-- highlight.js by changing the language class to "nohighlight", and adding "data-noescape".       -->
+    {{- $content := replaceRE `<code class="language-\w+"\s+data-lang="\w+"` `<code class="nohighlight" data-noescape` $content -}}
     <!-- Support both <hr /> (blackfriday) and <hr> (mmark) -->
     {{- $content := replace $content "<hr>" "<hr />" -}}
     <!-- Split the processed content by <hr /> tag -->