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