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;;;; 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!)