From e45bcc21473cb56f074ba85bcef89ebae5851ced Mon Sep 17 00:00:00 2001
From: "Kevin M. Rosenberg" <kevin@rosenberg.net>
Date: Wed, 10 Sep 2003 05:44:47 +0000
Subject: [PATCH] r7795: add directory-tree and probe-directory functions

---
 io.lisp | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/io.lisp b/io.lisp
index 7fbf186..68a6bc2 100644
--- a/io.lisp
+++ b/io.lisp
@@ -190,3 +190,59 @@
   (when (probe-file #p"/dev/null")
     (open-device-stream #p"/dev/null" :output))  
   )
+
+(defun un-unspecific (value)
+  "Convert :UNSPECIFIC to NIL."
+  (if (eq value :unspecific) nil value))
+
+(defun canonicalize-directory-name (filename)
+  (flet ((un-unspecific (value)
+	   (if (eq value :unspecific) nil value)))
+    (let* ((path (pathname filename))
+	   (name (un-unspecific (pathname-name path)))
+	   (type (un-unspecific (pathname-type path)))
+	   (new-dir
+	    (cond ((and name type) (list (concatenate 'string name "." type)))
+		  (name (list name))
+		  (type (list type))
+		  (t nil))))
+      (if new-dir
+	  (make-pathname
+	   :directory (append (un-unspecific (pathname-directory path))
+			      new-dir)
+		    :name nil :type nil :version nil :defaults path)
+	  path))))
+  
+(defun probe-directory (filename)
+  (let ((path (canonicalize-directory-name filename)))
+    #+allegro (excl:probe-directory path)
+    #+clisp (values
+	     (ignore-errors
+	       (#+lisp=cl ext:probe-directory #-lisp=cl lisp:probe-directory
+			  path)))
+    #+(or cmu scl) (eq :directory (unix:unix-file-kind (namestring path)))
+    #+lispworks (lw:file-directory-p path)
+    #+sbcl (eq :directory (sb-unix:unix-file-kind (namestring path)))
+    #-(or allegro clisp cmu lispworks sbcl scl)
+    (probe-file path)))
+
+(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)))))
+
+  
-- 
2.34.1