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Diffstat (limited to 'module/ice-9/history.scm')
-rw-r--r-- | module/ice-9/history.scm | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/module/ice-9/history.scm b/module/ice-9/history.scm new file mode 100644 index 000000000..e9097c2cc --- /dev/null +++ b/module/ice-9/history.scm @@ -0,0 +1,41 @@ +;;;; Copyright (C) 2000, 2001, 2004, 2006 Free Software Foundation, Inc. +;;;; +;;;; This library is free software; you can redistribute it and/or +;;;; modify it under the terms of the GNU Lesser General Public +;;;; License as published by the Free Software Foundation; either +;;;; version 3 of the License, or (at your option) any later version. +;;;; +;;;; This library is distributed in the hope that it will be useful, +;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of +;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +;;;; Lesser General Public License for more details. +;;;; +;;;; You should have received a copy of the GNU Lesser General Public +;;;; License along with this library; if not, write to the Free Software +;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +;;;; + +;;;; A simple value history support + +(define-module (ice-9 history)) + +(process-define-module '((value-history))) + +(define (use-value-history x) + (module-use! (current-module) + (resolve-interface '(value-history)))) + +(define save-value-history + (let ((count 0) + (history (resolve-module '(value-history)))) + (lambda (v) + (if (not (unspecified? v)) + (let* ((c (1+ count)) + (s (string->symbol (simple-format #f "$~A" c)))) + (simple-format #t "~A = " s) + (module-define! history s v) + (module-export! history (list s)) + (set! count c)))))) + +(add-hook! before-eval-hook use-value-history) +(add-hook! before-print-hook save-value-history) |