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870777d7 KN |
1 | ;;;; Copyright (C) 2000 Free Software Foundation, Inc. |
2 | ;;;; | |
3 | ;;;; This program is free software; you can redistribute it and/or modify | |
4 | ;;;; it under the terms of the GNU General Public License as published by | |
5 | ;;;; the Free Software Foundation; either version 2, or (at your option) | |
6 | ;;;; any later version. | |
7 | ;;;; | |
8 | ;;;; This program is distributed in the hope that it will be useful, | |
9 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | ;;;; GNU General Public License for more details. | |
12 | ;;;; | |
13 | ;;;; You should have received a copy of the GNU General Public License | |
14 | ;;;; along with this software; see the file COPYING. If not, write to | |
15 | ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
16 | ;;;; Boston, MA 02111-1307 USA | |
17 | ;;;; | |
18 | \f | |
19 | ;;;; A simple value history support | |
20 | ||
21 | (define-module (ice-9 history)) | |
22 | ||
23 | (define (use-value-history x) | |
24 | (module-use! (current-module) | |
25 | (resolve-module '(value-history)))) | |
26 | ||
27 | (define save-value-history | |
28 | (let ((count 0) | |
29 | (history (resolve-module '(value-history)))) | |
30 | (lambda (v) | |
31 | (if (not (unspecified? v)) | |
32 | (let* ((c (1+ count)) | |
33 | (s (string->symbol (simple-format #f "$~A" c)))) | |
34 | (simple-format #t "~A = " s) | |
35 | (module-define! history s v) | |
36 | (set! count c)))))) | |
37 | ||
38 | (add-hook! before-eval-hook use-value-history) | |
39 | (add-hook! before-print-hook save-value-history) |