source: trunk/j/src/org/armedbear/lisp/enough-namestring.lisp @ 6090

Last change on this file since 6090 was 6090, checked in by piso, 17 years ago

Initial checkin.

File size: 2.0 KB
Line 
1;;; enough-namestring.lisp
2;;;
3;;; Copyright (C) 2004 Peter Graves
4;;; $Id: enough-namestring.lisp,v 1.1 2004-03-05 18:24:29 piso Exp $
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 SBCL.
21
22(in-package "SYSTEM")
23
24(defun equal-components-p (this that)
25  #+win32 (equalp this that)
26  #-win32 (equal this that))
27
28(defun enough-namestring (pathname
29                          &optional
30                          (defaults *default-pathname-defaults*))
31  (let* ((pathname-directory (pathname-directory pathname))
32         (defaults-directory (pathname-directory defaults))
33         (prefix-len (length defaults-directory))
34         (result-directory
35          (cond ((and (> prefix-len 1)
36                      (>= (length pathname-directory) prefix-len)
37                      (equal-components-p (subseq pathname-directory 0 prefix-len)
38                                          defaults-directory))
39                 (cons :relative (nthcdr prefix-len pathname-directory)))
40                ((eq (car pathname-directory) :absolute)
41                 pathname-directory)
42                (t
43                 (error "~S cannot be represented relative to ~S."
44                        pathname
45                        defaults)))))
46    (concatenate 'simple-string
47                 (directory-namestring (make-pathname :directory result-directory))
48                 (file-namestring pathname))))
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