/usr/share/audacity/nyquist/printrec.lsp is in audacity-data 2.1.2-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | ; prints recursive list structure
;(let (seen-list)
(setf seenlist nil)
(defun seenp (l) (member l seenlist :test 'eq))
(defun make-seen (l) (setf seenlist (cons l seenlist)))
(defun printrec (l) (printrec-any l) (setf seenlist nil))
(defun printrec-any (l)
(cond ((atom l) (prin1 l) (princ " "))
((seenp l) (princ "<...> "))
(t
(make-seen l)
(princ "(")
(printrec-list l)
(princ ") ")))
nil)
(defun printrec-list (l)
(printrec-any (car l))
(cond ((cdr l)
(cond ((seenp (cdr l))
(princ "<...> "))
((atom (cdr l))
(princ ". ")
(prin1 (cdr l))
(princ " "))
(t
(make-seen (cdr l))
(printrec-list (cdr l))))))
nil)
; )
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