mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-30 11:50:28 +02:00
65 lines
2.3 KiB
Scheme
65 lines
2.3 KiB
Scheme
;;;; 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!)
|