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+;;; -*-Scheme-*-
+;;;
+;;;    $Id: dirw32.scm,v 1.1 1996/12/07 22:23:52 cph Exp $
+;;;
+;;;    Copyright (c) 1996 Massachusetts Institute of Technology
+;;;
+;;;    This material was developed by the Scheme project at the
+;;;    Massachusetts Institute of Technology, Department of
+;;;    Electrical Engineering and Computer Science.  Permission to
+;;;    copy this software, to redistribute it, and to use it for any
+;;;    purpose is granted, subject to the following restrictions and
+;;;    understandings.
+;;;
+;;;    1. Any copy made of this software must include this copyright
+;;;    notice in full.
+;;;
+;;;    2. Users of this software agree to make their best efforts (a)
+;;;    to return to the MIT Scheme project any improvements or
+;;;    extensions that they make, so that these may be included in
+;;;    future releases; and (b) to inform MIT of noteworthy uses of
+;;;    this software.
+;;;
+;;;    3. All materials developed as a consequence of the use of this
+;;;    software shall duly acknowledge such use, in accordance with
+;;;    the usual standards of acknowledging credit in academic
+;;;    research.
+;;;
+;;;    4. MIT has made no warrantee or representation that the
+;;;    operation of this software will be error-free, and MIT is
+;;;    under no obligation to provide any services, by way of
+;;;    maintenance, update, or otherwise.
+;;;
+;;;    5. In conjunction with products arising from the use of this
+;;;    material, there shall be no use of the name of the
+;;;    Massachusetts Institute of Technology nor of any adaptation
+;;;    thereof in any advertising, promotional, or sales literature
+;;;    without prior written consent from MIT in each case.
+;;;
+;;; NOTE: Parts of this program (Edwin) were created by translation
+;;; from corresponding parts of GNU Emacs.  Users should be aware that
+;;; the GNU GENERAL PUBLIC LICENSE may apply to these parts.  A copy
+;;; of that license should have been included along with this file.
+;;;
+
+;;;; Directory Editor (Win32 Customizations)
+;;; package: (edwin dired)
+
+(declare (usual-integrations))
+\f
+(define-key 'dired #\S 'dired-hidden-toggle)
+(define-key 'dired #\M 'dired-chmod)
+
+(define-command dired-hidden-toggle
+  "Toggle display of hidden/system files on and off."
+  ()
+  (lambda () (dired-toggle-switch #\a)))
+
+(define (win32/parse-attributes-spec spec)
+  (let ((end (string-length spec))
+       (plus '())
+       (minus '()))
+    (let loop ((index 0) (state #f))
+      (if (< index end)
+         (let ((char (char-downcase (string-ref spec index)))
+               (index (+ index 1)))
+           (case char
+             ((#\+ #\-)
+              (loop index char))
+             ((#\a #\c #\h #\r #\s)
+              (set! plus (delv! char plus))
+              (set! minus (delv! char minus))
+              (case state
+                ((#\+)
+                 (set! plus (cons char plus))
+                 (loop index state))
+                ((#\-)
+                 (set! minus (cons char minus))
+                 (loop index state))
+                (else #f)))
+             (else #f)))
+         (values (win32/attribute-letters-to-mask plus)
+                 (win32/attribute-letters-to-mask minus))))))
+
+(define-command dired-chmod
+  "Change mode of this file."
+  "sChange to Mode\nP"
+  (lambda (spec argument)
+    (call-with-values (lambda () (win32/parse-attributes-spec spec))
+      (lambda (plus minus)
+       (dired-change-files "change attributes of" argument
+         (lambda (pathname lstart)
+           (set-file-modes! pathname
+                            (fix:or (fix:andc (file-modes pathname)
+                                              minus)
+                                    plus))
+           (dired-redisplay pathname lstart)))))))
+
+(define (win32/attribute-letters-to-mask letters)
+  (let ((mask 0))
+    (for-each (lambda (letter)
+               (set! mask
+                     (fix:or (case letter
+                               ((#\a) nt-file-mode/archive)
+                               ((#\c) nt-file-mode/compressed)
+                               ((#\d) nt-file-mode/directory)
+                               ((#\h) nt-file-mode/hidden)
+                               ((#\r) nt-file-mode/read-only)
+                               ((#\s) nt-file-mode/system)
+                               (else (error "Unknown mode letter:" letter)))
+                             mask))
+               unspecific)
+             letters)
+    mask))
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