Nachts (Josephine Lang)/scheme

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dynamictext =
#(define-event-function (text) (markup?)
   (if (string? text)
       (let* ((underscores-replaced
               (string-map
                (lambda (x) (if (eq? x #\_) #\space x))
                text))
              (split-text (string-split underscores-replaced #\space))
              (formatted (map
                          (lambda (word)
                            (if (string-match "^[mrzfps]*$" word)
                                (markup #:dynamic word)
                                (markup #:normal-text #:italic word)))
                          split-text)))
         #{
           #(make-dynamic-script (make-line-markup formatted))
         #})
       ;; user provided a full-blown markup, so we don't mess with it:
       #{
         #(make-dynamic-script (markup #:normal-text text))
       #}))