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Diffstat (limited to 'module/ice-9/history.scm')
-rw-r--r-- | module/ice-9/history.scm | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/module/ice-9/history.scm b/module/ice-9/history.scm new file mode 100644 index 000000000..ebf609bf3 --- /dev/null +++ b/module/ice-9/history.scm @@ -0,0 +1,65 @@ +;;;; Copyright (C) 2000, 2001, 2004, 2006, 2010 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) + #:export (value-history-enabled? enable-value-history! disable-value-history! + clear-value-history!)) + +(define-module* '(value-history)) + +(define *value-history-enabled?* #f) +(define (value-history-enabled?) + *value-history-enabled?*) + +(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)))))) + +(define (enable-value-history!) + (if (not (value-history-enabled?)) + (begin + (add-hook! before-eval-hook use-value-history) + (add-hook! before-print-hook save-value-history) + (set! *value-history-enabled?* #t)))) + +(define (disable-value-history!) + (if (value-history-enabled?) + (begin + (remove-hook! before-eval-hook use-value-history) + (remove-hook! before-print-hook save-value-history) + (set! *value-history-enabled?* #f)))) + +(define (clear-value-history!) + (let ((history (resolve-module '(value-history)))) + (hash-clear! (module-obarray history)) + (hash-clear! (module-obarray (module-public-interface history))))) + +(enable-value-history!) |