X-Git-Url: http://git.kpe.io/?p=kmrcl.git;a=blobdiff_plain;f=io.lisp;h=4dea295f5e789d6dacb1c2eb86fe99c155d71487;hp=7fbf186753e9f2ba731357bf66bdf60e0cd448c1;hb=6f333885c716800cf85c2986a3b835efe0e54e70;hpb=d11d6cc43fd9227a8aeed28dc2cfecdbc587ec4a

diff --git a/io.lisp b/io.lisp
index 7fbf186..4dea295 100644
--- a/io.lisp
+++ b/io.lisp
@@ -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)))))
+
+