source: trunk/abcl/src/org/armedbear/lisp/query.lisp

Last change on this file was 11391, checked in by vvoutilainen, 13 years ago

ABCL license is GPL + Classpath exception. This was intended
by Peter Graves, the original author. For reference, see
http://sourceforge.net/mailarchive/forum.php?thread_name=20040721115302.839%40prufrock&forum_name=armedbear-j-announce

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.8 KB
Line 
1;;; query.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: query.lisp 11391 2008-11-15 22:38:34Z vvoutilainen $
5;;;
6;;; This program is free software; you can redistribute it and/or
7;;; modify it under the terms of the GNU General Public License
8;;; as published by the Free Software Foundation; either version 2
9;;; of the License, or (at your option) any later version.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14;;; GNU General Public License for more details.
15;;;
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19;;;
20;;; As a special exception, the copyright holders of this library give you
21;;; permission to link this library with independent modules to produce an
22;;; executable, regardless of the license terms of these independent
23;;; modules, and to copy and distribute the resulting executable under
24;;; terms of your choice, provided that you also meet, for each linked
25;;; independent module, the terms and conditions of the license of that
26;;; module.  An independent module is a module which is not derived from
27;;; or based on this library.  If you modify this library, you may extend
28;;; this exception to your version of the library, but you are not
29;;; obligated to do so.  If you do not wish to do so, delete this
30;;; exception statement from your version.
31
32;;; Adapted from CMUCL.
33
34(in-package "SYSTEM")
35
36(defun query-readline ()
37  (force-output *query-io*)
38  (string-trim '(#\space #\tab) (read-line *query-io*)))
39
40(defun y-or-n-p (&optional format-string &rest arguments)
41  (when format-string
42    (fresh-line *query-io*)
43    (apply #'format *query-io* format-string arguments))
44  (loop
45    (let* ((line (query-readline))
46     (ans (if (string= line "")
47        #\? ;Force CASE below to issue instruction.
48        (schar line 0))))
49      (unless (whitespacep ans)
50  (case ans
51    ((#\y #\Y) (return t))
52    ((#\n #\N) (return nil))
53    (t
54     (write-line "Type \"y\" for yes or \"n\" for no. " *query-io*)
55     (when format-string
56       (apply #'format *query-io* format-string arguments))
57     (force-output *query-io*)))))))
58
59(defun yes-or-no-p (&optional format-string &rest arguments)
60  (clear-input *query-io*)
61  (when format-string
62    (fresh-line *query-io*)
63    (apply #'format *query-io* format-string arguments))
64  (do ((ans (query-readline) (query-readline)))
65      (())
66    (cond ((string-equal ans "YES") (return t))
67    ((string-equal ans "NO") (return nil))
68    (t
69     (write-line "Type \"yes\" for yes or \"no\" for no. " *query-io*)
70     (when format-string
71       (apply #'format *query-io* format-string arguments))))))
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