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39 lines
1.4 KiB
Scheme
39 lines
1.4 KiB
Scheme
;;;; Copyright (C) 2000 Free Software Foundation, Inc.
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;;;;
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;;;; This program is free software; you can redistribute it and/or modify
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;;;; it under the terms of the GNU General Public License as published by
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;;;; the Free Software Foundation; either version 2, or (at your option)
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;;;; any later version.
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;;;;
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;;;; This program is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;;; GNU General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU General Public License
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;;;; along with this software; see the file COPYING. If not, write to
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;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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;;;; Boston, MA 02111-1307 USA
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;;;;
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;;;; A simple value history support
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(define-module (ice-9 history))
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(define (use-value-history x)
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(module-use! (current-module)
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(resolve-module '(value-history))))
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(define save-value-history
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(let ((count 0)
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(history (resolve-module '(value-history))))
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(lambda (v)
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(if (not (unspecified? v))
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(let* ((c (1+ count))
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(s (string->symbol (simple-format #f "$~A" c))))
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(simple-format #t "~A = " s)
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(module-define! history s v)
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(set! count c))))))
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(add-hook! before-eval-hook use-value-history)
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(add-hook! before-print-hook save-value-history)
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