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(define transcript-on #f)
(define transcript-off #f)
(let ((*transcript-stack* '()))
(define (trans-on filename)
(let ((trans (open-output-file filename))
(inp (current-input-port))
(outp (current-output-port))
(errp (current-error-port)))
(define (clone-port port)
(make-soft-port
(vector (and (output-port? port)
(lambda (c)
(write-char c port)
(write-char c trans)))
(and (output-port? port)
(lambda (s)
(display s port)
(display s trans)))
(and (output-port? port)
(lambda ()
(force-output port)
(force-output trans)))
(and (input-port? port)
(lambda ()
(let ((c (read-char port)))
(write-char c trans)
c)))
(lambda ()
(close-port port)))
(if (input-port? port)
(if (output-port? port) "r+" "r")
"w")))
(set! *transcript-stack*
(cons (list trans
(current-input-port)
(current-output-port)
(current-error-port))
*transcript-stack*))
(set-current-input-port (clone-port inp))
(set-current-output-port (clone-port outp))
(set-current-error-port (clone-port errp))))
(define (trans-off)
(cond ((pair? *transcript-stack*)
(apply (lambda (trans inp outp errp)
(close-port trans)
(set-current-input-port inp)
(set-current-output-port outp)
(set-current-error-port errp))
(car *transcript-stack*))
(set! *transcript-stack* (cdr *transcript-stack*)))
(else
(error "No transcript active"))))
(set! transcript-on trans-on)
(set! transcript-off trans-off))
(provide 'transcript)
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