[bpt/guile.git] / ice-9 / history.scm

;;;; 	Copyright (C) 2000, 2001 Free Software Foundation, Inc.
;;;; 
;;;; This program is free software; you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation; either version 2, or (at your option)
;;;; any later version.
;;;; 
;;;; This program 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 General Public License for more details.
;;;; 
;;;; You should have received a copy of the GNU General Public License
;;;; along with this software; see the file COPYING.  If not, write to
;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
;;;; Boston, MA 02111-1307 USA
;;;;
;;;; As a special exception, the Free Software Foundation gives permission
;;;; for additional uses of the text contained in its release of GUILE.
;;;;
;;;; The exception is that, if you link the GUILE library with other files
;;;; to produce an executable, this does not by itself cause the
;;;; resulting executable to be covered by the GNU General Public License.
;;;; Your use of that executable is in no way restricted on account of
;;;; linking the GUILE library code into it.
;;;;
;;;; This exception does not however invalidate any other reasons why
;;;; the executable file might be covered by the GNU General Public License.
;;;;
;;;; This exception applies only to the code released by the
;;;; Free Software Foundation under the name GUILE.  If you copy
;;;; code from other Free Software Foundation releases into a copy of
;;;; GUILE, as the General Public License permits, the exception does
;;;; not apply to the code that you add in this way.  To avoid misleading
;;;; anyone as to the status of such modified files, you must delete
;;;; this exception notice from them.
;;;;
;;;; If you write modifications of your own for GUILE, it is your choice
;;;; whether to permit this exception to apply to your modifications.
;;;; If you do not wish that, delete this exception notice.
;;;; 
\f
;;;; A simple value history support

(define-module (ice-9 history))

(process-define-module '((value-history)))

(define (use-value-history x)
  (module-use! (current-module)
	       (resolve-module '(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)
	    (set! count c))))))

(add-hook! before-eval-hook use-value-history)
(add-hook! before-print-hook save-value-history)
Commit	Line	Data
e39bbe80	1	;;;; Copyright (C) 2000, 2001 Free Software Foundation, Inc.
870777d7 KN	2	;;;;
	3	;;;; This program is free software; you can redistribute it and/or modify
	4	;;;; it under the terms of the GNU General Public License as published by
	5	;;;; the Free Software Foundation; either version 2, or (at your option)
	6	;;;; any later version.
	7	;;;;
	8	;;;; This program is distributed in the hope that it will be useful,
	9	;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	;;;; GNU General Public License for more details.
	12	;;;;
	13	;;;; You should have received a copy of the GNU General Public License
	14	;;;; along with this software; see the file COPYING. If not, write to
	15	;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
	16	;;;; Boston, MA 02111-1307 USA
a482f2cc MV	17	;;;;
	18	;;;; As a special exception, the Free Software Foundation gives permission
	19	;;;; for additional uses of the text contained in its release of GUILE.
	20	;;;;
	21	;;;; The exception is that, if you link the GUILE library with other files
	22	;;;; to produce an executable, this does not by itself cause the
	23	;;;; resulting executable to be covered by the GNU General Public License.
	24	;;;; Your use of that executable is in no way restricted on account of
	25	;;;; linking the GUILE library code into it.
	26	;;;;
	27	;;;; This exception does not however invalidate any other reasons why
	28	;;;; the executable file might be covered by the GNU General Public License.
	29	;;;;
	30	;;;; This exception applies only to the code released by the
	31	;;;; Free Software Foundation under the name GUILE. If you copy
	32	;;;; code from other Free Software Foundation releases into a copy of
	33	;;;; GUILE, as the General Public License permits, the exception does
	34	;;;; not apply to the code that you add in this way. To avoid misleading
	35	;;;; anyone as to the status of such modified files, you must delete
	36	;;;; this exception notice from them.
	37	;;;;
	38	;;;; If you write modifications of your own for GUILE, it is your choice
	39	;;;; whether to permit this exception to apply to your modifications.
	40	;;;; If you do not wish that, delete this exception notice.
870777d7 KN	41	;;;;
	42	\f
	43	;;;; A simple value history support
	44
	45	(define-module (ice-9 history))
	46
b727d0bd KN	47	(process-define-module '((value-history)))
b727d0bd KN	48
870777d7 KN	49	(define (use-value-history x)
	50	(module-use! (current-module)
	51	(resolve-module '(value-history))))
	52
	53	(define save-value-history
	54	(let ((count 0)
	55	(history (resolve-module '(value-history))))
	56	(lambda (v)
	57	(if (not (unspecified? v))
	58	(let* ((c (1+ count))
	59	(s (string->symbol (simple-format #f "$~A" c))))
	60	(simple-format #t "~A = " s)
	61	(module-define! history s v)
	62	(set! count c))))))
	63
	64	(add-hook! before-eval-hook use-value-history)
	65	(add-hook! before-print-hook save-value-history)