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e39bbe80 | 1 | ;;;; Copyright (C) 2000, 2001 Free Software Foundation, Inc. |
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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 | |
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17 | ;;;; |
18 | ;;;; As a special exception, the Free Software Foundation gives permission | |
19 | ;;;; for additional uses of the text contained in its release of GUILE. | |
20 | ;;;; | |
21 | ;;;; The exception is that, if you link the GUILE library with other files | |
22 | ;;;; to produce an executable, this does not by itself cause the | |
23 | ;;;; resulting executable to be covered by the GNU General Public License. | |
24 | ;;;; Your use of that executable is in no way restricted on account of | |
25 | ;;;; linking the GUILE library code into it. | |
26 | ;;;; | |
27 | ;;;; This exception does not however invalidate any other reasons why | |
28 | ;;;; the executable file might be covered by the GNU General Public License. | |
29 | ;;;; | |
30 | ;;;; This exception applies only to the code released by the | |
31 | ;;;; Free Software Foundation under the name GUILE. If you copy | |
32 | ;;;; code from other Free Software Foundation releases into a copy of | |
33 | ;;;; GUILE, as the General Public License permits, the exception does | |
34 | ;;;; not apply to the code that you add in this way. To avoid misleading | |
35 | ;;;; anyone as to the status of such modified files, you must delete | |
36 | ;;;; this exception notice from them. | |
37 | ;;;; | |
38 | ;;;; If you write modifications of your own for GUILE, it is your choice | |
39 | ;;;; whether to permit this exception to apply to your modifications. | |
40 | ;;;; If you do not wish that, delete this exception notice. | |
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41 | ;;;; |
42 | \f | |
43 | ;;;; A simple value history support | |
44 | ||
45 | (define-module (ice-9 history)) | |
46 | ||
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47 | (process-define-module '((value-history))) |
48 | ||
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49 | (define (use-value-history x) |
50 | (module-use! (current-module) | |
51 | (resolve-module '(value-history)))) | |
52 | ||
53 | (define save-value-history | |
54 | (let ((count 0) | |
55 | (history (resolve-module '(value-history)))) | |
56 | (lambda (v) | |
57 | (if (not (unspecified? v)) | |
58 | (let* ((c (1+ count)) | |
59 | (s (string->symbol (simple-format #f "$~A" c)))) | |
60 | (simple-format #t "~A = " s) | |
61 | (module-define! history s v) | |
62 | (set! count c)))))) | |
63 | ||
64 | (add-hook! before-eval-hook use-value-history) | |
65 | (add-hook! before-print-hook save-value-history) |