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add utils to turn value history on and off, and to clear it

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* module/ice-9/history.scm (enable-value-history!)
  (disable-value-history!, clear-value-history!): New exports.
This commit is contained in:
Andy Wingo 2010-07-10 10:44:29 +02:00
parent a85f90f5ac
commit a38dd31ffc
1 changed files with 26 additions and 4 deletions
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30
module/ice-9/history.scm
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@ -1,4 +1,4 @@
;;;; Copyright (C) 2000, 2001, 2004, 2006 Free Software Foundation, Inc.
;;;; 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
@ -17,10 +17,14 @@
;;;; A simple value history support
(define-module (ice-9 history))
(define-module (ice-9 history)
#:export (enable-value-history! disable-value-history!
clear-value-history!))
(process-define-module '((value-history)))
(define value-history-enabled? #f)
(define (use-value-history x)
(module-use! (current-module)
(resolve-interface '(value-history))))
@ -37,5 +41,23 @@
(module-export! history (list s))
(set! count c))))))
(add-hook! before-eval-hook use-value-history)
(add-hook! before-print-hook save-value-history)
(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!)