#| -*-Scheme-*-

$Id: os2dir.scm,v 1.9 2007/01/05 21:19:28 cph Exp $

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme 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 of the License, or (at
your option) any later version.

MIT/GNU Scheme 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
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

;;;; Directory Operations -- OS/2
;;; package: (runtime directory)

(declare (usual-integrations))

(define *expand-directory-prefixes?* #t)

(define (directory-read pattern #!optional sort?)
  (if (if (default-object? sort?) #t sort?)
      (sort (directory-read-nosort pattern) pathname<?)
      (directory-read-nosort pattern)))

(define (directory-read-nosort pattern)
  (let ((pattern (merge-pathnames pattern)))
    (map (let ((directory-path (directory-pathname pattern)))
	   (lambda (pathname)
	     (merge-pathnames pathname directory-path)))
	 (let ((fnames (generate-directory-pathnames pattern)))
	   (fluid-let ((*expand-directory-prefixes?* #f))
	     (map ->pathname fnames))))))

(define (generate-directory-pathnames pathname)
  (let ((channel (directory-channel-open (->namestring pathname))))
    (let loop ((result '()))
      (let ((name (directory-channel-read channel)))
	(if name
	    (loop (cons name result))
	    (begin
	      (directory-channel-close channel)
	      result))))))

(define (pathname<? x y)
  (string-ci<? (file-namestring x) (file-namestring y)))