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a38dd31f | 1 | ;;;; Copyright (C) 2000, 2001, 2004, 2006, 2010 Free Software Foundation, Inc. |
870777d7 | 2 | ;;;; |
73be1d9e MV |
3 | ;;;; This library is free software; you can redistribute it and/or |
4 | ;;;; modify it under the terms of the GNU Lesser General Public | |
5 | ;;;; License as published by the Free Software Foundation; either | |
53befeb7 | 6 | ;;;; version 3 of the License, or (at your option) any later version. |
870777d7 | 7 | ;;;; |
73be1d9e | 8 | ;;;; This library is distributed in the hope that it will be useful, |
870777d7 | 9 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
10 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | ;;;; Lesser General Public License for more details. | |
870777d7 | 12 | ;;;; |
73be1d9e MV |
13 | ;;;; You should have received a copy of the GNU Lesser General Public |
14 | ;;;; License along with this library; if not, write to the Free Software | |
92205699 | 15 | ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
870777d7 KN |
16 | ;;;; |
17 | \f | |
18 | ;;;; A simple value history support | |
19 | ||
a38dd31f | 20 | (define-module (ice-9 history) |
8c8a13ec | 21 | #:export (value-history-enabled? enable-value-history! disable-value-history! |
a38dd31f | 22 | clear-value-history!)) |
870777d7 | 23 | |
ec84b0a2 | 24 | (define-module* '(value-history)) |
b727d0bd | 25 | |
8c8a13ec AW |
26 | (define *value-history-enabled?* #f) |
27 | (define (value-history-enabled?) | |
28 | *value-history-enabled?*) | |
a38dd31f | 29 | |
870777d7 KN |
30 | (define (use-value-history x) |
31 | (module-use! (current-module) | |
b66dde3c | 32 | (resolve-interface '(value-history)))) |
870777d7 KN |
33 | |
34 | (define save-value-history | |
35 | (let ((count 0) | |
36 | (history (resolve-module '(value-history)))) | |
37 | (lambda (v) | |
38 | (if (not (unspecified? v)) | |
39 | (let* ((c (1+ count)) | |
40 | (s (string->symbol (simple-format #f "$~A" c)))) | |
41 | (simple-format #t "~A = " s) | |
42 | (module-define! history s v) | |
b66dde3c | 43 | (module-export! history (list s)) |
870777d7 KN |
44 | (set! count c)))))) |
45 | ||
a38dd31f | 46 | (define (enable-value-history!) |
8c8a13ec | 47 | (if (not (value-history-enabled?)) |
a38dd31f AW |
48 | (begin |
49 | (add-hook! before-eval-hook use-value-history) | |
50 | (add-hook! before-print-hook save-value-history) | |
8c8a13ec | 51 | (set! *value-history-enabled?* #t)))) |
a38dd31f AW |
52 | |
53 | (define (disable-value-history!) | |
8c8a13ec | 54 | (if (value-history-enabled?) |
a38dd31f AW |
55 | (begin |
56 | (remove-hook! before-eval-hook use-value-history) | |
57 | (remove-hook! before-print-hook save-value-history) | |
8c8a13ec | 58 | (set! *value-history-enabled?* #f)))) |
a38dd31f AW |
59 | |
60 | (define (clear-value-history!) | |
61 | (let ((history (resolve-module '(value-history)))) | |
62 | (hash-clear! (module-obarray history)) | |
63 | (hash-clear! (module-obarray (module-public-interface history))))) | |
64 | ||
65 | (enable-value-history!) |