I'm trying to make a wrapper for a latex command that has an optional
argument.  My current solution is to do the following to wrap a
command called `\foo`:

(define (foo #:opt [o #f] x)
  (if o
      (make-multiarg-element (make-style "SfooOpt" '(multicommand))
                             (list (decode-string o)
                                   (decode-string x)))
      (make-element (make-style "foo" '(command))
                    (decode-string x))))

And then I have to insert a definition in the latex:


Is there a better way to accomplish this?


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