r7814: add implementation-dependent file, new impl-dependent commands

[kmrcl.git] / io.lisp

diff --git a/io.lisp b/io.lisp
index 47fc178f5ed914712b8186a52db7c40531b0c2db..4dea295f5e789d6dacb1c2eb86fe99c155d71487 100644 (file)
--- a/io.lisp
+++ b/io.lisp
@@ -7,7 +7,7 @@
 ;;;; Programmer:    Kevin M. Rosenberg
 ;;;; Date Started:  Apr 2000
 ;;;;
-;;;; $Id: io.lisp,v 1.15 2003/07/31 17:03:37 kevin Exp $
+;;;; $Id$
 ;;;;
 ;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
 ;;;;
@@ -190,3 +190,25 @@
   (when (probe-file #p"/dev/null")
     (open-device-stream #p"/dev/null" :output))  
   )
+
+
+(defun directory-tree (filename)
+  "Returns a tree of pathnames for sub-directories of a directory"
+  (let* ((root (canonicalize-directory-name filename))
+        (subdirs (loop for path in (directory
+                                    (make-pathname :name :wild
+                                                   :type :wild
+                                                   :defaults root))
+                       when (probe-directory path)
+                       collect (canonicalize-directory-name path))))
+    (when (find nil subdirs)
+      (error "~A" subdirs))
+    (when (null root)
+      (error "~A" root))
+    (if subdirs
+       (cons root (mapcar #'directory-tree subdirs))
+       (if (probe-directory root)
+           (list root)
+           (error "root not directory ~A" root)))))
+
+