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; "trnscrpt.scm", transcript functions for Scheme.
; Copyright (c) 1992, 1993, 1995, 2007 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 warranty 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 ((rd-chr read-char) (wrt-chr write-char))
(lambda opt
(let ((ans (apply rd-chr opt)))
(cond ((eof-object? ans))
((output-port? transcript:port)
(wrt-chr ans transcript:port)))
ans))))
;@
(define read
(let ((rd read) (wrt write) (nwln newline))
(lambda opt
(let ((ans (apply rd opt)))
(cond ((eof-object? ans))
((output-port? transcript:port)
(wrt ans transcript:port)
(if (eqv? #\newline (apply peek-char opt))
(nwln transcript:port))))
ans))))
;@
(define write-char
(let ((wrt-chr write-char))
(lambda (obj . opt)
(apply wrt-chr obj opt)
(if (output-port? transcript:port)
(wrt-chr obj transcript:port)))))
;@
(define write
(let ((wrt write))
(lambda (obj . opt)
(apply wrt obj opt)
(if (output-port? transcript:port)
(wrt obj transcript:port)))))
;@
(define display
(let ((dspl display))
(lambda (obj . opt)
(apply dspl obj opt)
(if (output-port? transcript:port)
(dspl obj transcript:port)))))
;@
(define newline
(let ((nwln newline))
(lambda opt
(apply nwln opt)
(if (output-port? transcript:port)
(nwln transcript:port)))))
|
