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authorAndy Wingo <wingo@pobox.com>2010-07-10 10:44:29 +0200
committerAndy Wingo <wingo@pobox.com>2010-07-10 10:44:29 +0200
commita38dd31ffc2855cd3c2cbe4659a6cc6398d07cc5 (patch)
tree060f1e6e91722335c7352f0a8b7945fdebf7bb21
parenta85f90f5ac5c3c5f830e295c0ca7b006141b1a83 (diff)
downloadguile-a38dd31ffc2855cd3c2cbe4659a6cc6398d07cc5.tar.gz
add utils to turn value history on and off, and to clear it
* module/ice-9/history.scm (enable-value-history!) (disable-value-history!, clear-value-history!): New exports.
-rw-r--r--module/ice-9/history.scm30
1 files changed, 26 insertions, 4 deletions
diff --git a/module/ice-9/history.scm b/module/ice-9/history.scm
index e9097c2cc..7c5998861 100644
--- a/module/ice-9/history.scm
+++ b/module/ice-9/history.scm
@@ -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!)