source: trunk/j/src/org/armedbear/lisp/enough-namestring.lisp @ 10072

Last change on this file since 10072 was 10072, checked in by piso, 16 years ago

(enough-namestring #p"foo/bar" #p"foo") => "foo/bar"

File size: 2.3 KB
Line 
1;;; enough-namestring.lisp
2;;;
3;;; Copyright (C) 2004-2005 Peter Graves
4;;; $Id: enough-namestring.lisp,v 1.5 2005-10-03 13:33:34 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  (unless (equal (pathname-host pathname) (pathname-host defaults))
32    (return-from enough-namestring (namestring pathname)))
33  (let ((pathname-directory (pathname-directory pathname)))
34    (if pathname-directory
35        (let* ((defaults-directory (pathname-directory defaults))
36               (prefix-len (length defaults-directory))
37               (result-directory
38                (cond ((and (>= prefix-len 1)
39                            (>= (length pathname-directory) prefix-len)
40                            (equal-components-p (subseq pathname-directory 0 prefix-len)
41                                                defaults-directory))
42                       (cons :relative (nthcdr prefix-len pathname-directory)))
43                      ((eq (car pathname-directory) :absolute)
44                       pathname-directory)
45                      (t
46                       (return-from enough-namestring (namestring pathname))))))
47          (concatenate 'simple-string
48                       (directory-namestring (make-pathname :directory result-directory))
49                       (file-namestring pathname)))
50        (file-namestring pathname))))
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