| 1 | ;;;; Copyright (C) 2000, 2001, 2004, 2006 Free Software Foundation, Inc. |
| 2 | ;;;; |
| 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 |
| 6 | ;;;; version 2.1 of the License, or (at your option) any later version. |
| 7 | ;;;; |
| 8 | ;;;; This library 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 GNU |
| 11 | ;;;; Lesser General Public License for more details. |
| 12 | ;;;; |
| 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 |
| 15 | ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 16 | ;;;; |
| 17 | \f |
| 18 | ;;;; A simple value history support |
| 19 | |
| 20 | (define-module (ice-9 history)) |
| 21 | |
| 22 | (process-define-module '((value-history))) |
| 23 | |
| 24 | (define (use-value-history x) |
| 25 | (module-use! (current-module) |
| 26 | (resolve-interface '(value-history)))) |
| 27 | |
| 28 | (define save-value-history |
| 29 | (let ((count 0) |
| 30 | (history (resolve-module '(value-history)))) |
| 31 | (lambda (v) |
| 32 | (if (not (unspecified? v)) |
| 33 | (let* ((c (1+ count)) |
| 34 | (s (string->symbol (simple-format #f "$~A" c)))) |
| 35 | (simple-format #t "~A = " s) |
| 36 | (module-define! history s v) |
| 37 | (module-export! history (list s)) |
| 38 | (set! count c)))))) |
| 39 | |
| 40 | (add-hook! before-eval-hook use-value-history) |
| 41 | (add-hook! before-print-hook save-value-history) |