source: trunk/j/src/org/armedbear/lisp/query.lisp @ 11297

Last change on this file since 11297 was 11297, checked in by ehuelsmann, 13 years ago

Set Id keyword for expansion.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.0 KB
Line 
1;;; query.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: query.lisp 11297 2008-08-31 13:26:45Z ehuelsmann $
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;;; Adapted from CMUCL.
21
22(in-package "SYSTEM")
23
24(defun query-readline ()
25  (force-output *query-io*)
26  (string-trim '(#\space #\tab) (read-line *query-io*)))
27
28(defun y-or-n-p (&optional format-string &rest arguments)
29  (when format-string
30    (fresh-line *query-io*)
31    (apply #'format *query-io* format-string arguments))
32  (loop
33    (let* ((line (query-readline))
34     (ans (if (string= line "")
35        #\? ;Force CASE below to issue instruction.
36        (schar line 0))))
37      (unless (whitespacep ans)
38  (case ans
39    ((#\y #\Y) (return t))
40    ((#\n #\N) (return nil))
41    (t
42     (write-line "Type \"y\" for yes or \"n\" for no. " *query-io*)
43     (when format-string
44       (apply #'format *query-io* format-string arguments))
45     (force-output *query-io*)))))))
46
47(defun yes-or-no-p (&optional format-string &rest arguments)
48  (clear-input *query-io*)
49  (when format-string
50    (fresh-line *query-io*)
51    (apply #'format *query-io* format-string arguments))
52  (do ((ans (query-readline) (query-readline)))
53      (())
54    (cond ((string-equal ans "YES") (return t))
55    ((string-equal ans "NO") (return nil))
56    (t
57     (write-line "Type \"yes\" for yes or \"no\" for no. " *query-io*)
58     (when format-string
59       (apply #'format *query-io* format-string arguments))))))
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