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Wrap
Lisp/Scheme
|
1985-02-17
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642b
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20 lines
(setq *tracelist* nil)
(defun evalhookfcn (expr &aux val)
(if (and (consp expr) (member (car expr) *tracelist*))
(progn (princ ">>> ") (print expr)
(setq val (evalhook expr evalhookfcn nil))
(princ "<<< ") (print val))
(evalhook expr evalhookfcn nil)))
(defun trace (fun)
(if (not (member fun *tracelist*))
(progn (setq *tracelist* (cons fun *tracelist*))
(setq *evalhook* evalhookfcn)))
*tracelist*)
(defun untrace (fun)
(if (null (setq *tracelist* (delete fun *tracelist*)))
(setq *evalhook* nil))
*tracelist*)