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; "trnscrpt.scm", transcript functions for Scheme.
; Copyright (c) 1992, 1993, 1995 Aubrey Jaffer
;
;Permission to copy this software, to modify it, to redistribute it,
;to distribute modified versions, and to use it for any purpose is
;granted, subject to the following restrictions and understandings.
;
;1. Any copy made of this software must include this copyright notice
;in full.
;
;2. I have made no warrantee or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3. In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.
(define transcript:port #f)
(define (transcript-on filename)
(set! transcript:port (open-output-file filename)))
(define (transcript-off)
(if (output-port? transcript:port)
(close-output-port transcript:port))
(set! transcript:port #f))
(define read-char
(let ((read-char read-char) (write-char write-char))
(lambda opt
(let ((ans (apply read-char opt)))
(cond ((eof-object? ans))
((output-port? transcript:port)
(write-char ans transcript:port)))
ans))))
(define read
(let ((read read) (write write) (newline newline))
(lambda opt
(let ((ans (apply read opt)))
(cond ((eof-object? ans))
((output-port? transcript:port)
(write ans transcript:port)
(if (eqv? #\newline (apply peek-char opt))
(newline transcript:port))))
ans))))
(define write-char
(let ((write-char write-char))
(lambda (obj . opt)
(apply write-char obj opt)
(if (output-port? transcript:port)
(write-char obj transcript:port)))))
(define write
(let ((write write))
(lambda (obj . opt)
(apply write obj opt)
(if (output-port? transcript:port)
(write obj transcript:port)))))
(define display
(let ((display display))
(lambda (obj . opt)
(apply display obj opt)
(if (output-port? transcript:port)
(display obj transcript:port)))))
(define newline
(let ((newline newline))
(lambda opt
(apply newline opt)
(if (output-port? transcript:port)
(newline transcript:port)))))
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