Clojurians Log v2

You cannot, not via cryogen proper. Rendering markup to html is done by the markup plugin such as cryogen-asciidoctor. Look at what it allows (eg asciidoctor allows custom macros / extensions) or fork and adjust it.

Otherwise you'd need to do some post-processing of the html

well, i figured out how to do it, but it’s ugly lol

(defn transform-html
  "Creates an enlive-snippet from `html-string` then removes
  the newline nodes"
  [html-string]
  (->> (enlive/html-snippet html-string)
       (walk/postwalk
         (fn [node]
           (if (seq? node)
             (remove #(and (string? %) (re-matches #"\n\h*" %)) node)
             node)))
       (walk/postwalk
         (fn [node]
           (if (= "listingblock" (get-in node [:attrs :class]))
             (let [pre (-> node :content first :content first)
                   n (first (:content pre))
                   lang (keyword (get-in n [:attrs :data-lang]))
                   content (-> (:content n)
                               (first)
                               (clygments/highlight lang :html))
                   n (list (assoc n :content (enlive/html-snippet content)))]
               (assoc node :content (list (assoc pre :content n))))
             node)))))

(alter-var-root
  #'util/trimmed-html-snippet
  (fn [_f] transform-html))