--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/prim/lisp-file-db.el	Mon Aug 13 10:02:21 2007 +0200
@@ -0,0 +1,39 @@
+(defvar *default-db-name* (expand-file-name "~/.xemacs/lisp-file-database")
+  "Default location of the database")
+
+(defun build-lisp-file-db (&optional db-name path rebuild)
+  "Create a database of all lisp files in the directories given by PATH.
+DB-NAME is the database name, defaulting to *default-db-name*
+PATH is a list of directories to search, defaulting to load-path.
+REBUILD "
+  (let ((path (or path load-path))
+	(db (open-database (or db-name *default-db-name*) nil nil "rw+")))
+    ;; For each entry in path, find all files in it and put them in
+    ;; the database.
+    (dolist (dir path)
+      (dolist (file (directory-files dir t nil t t))
+	;; Separate the file name and the directory.  The key is the
+	;; filename, and the value is the whole pathname.  However, if
+	;; the key already exists, DON'T put that entry in.  We want
+	;; things that occur first in load-path to override entries
+	;; later in load-path
+	(let ((fname (file-name-nondirectory file)))
+	  (put-database fname file db nil))))))
+
+(defun show-lisp-db (&optional db-name)
+  (let ((db (open-database (or db-name *default-db-name*) nil nil "r"))
+	(entries '()))
+    (map-database #'(lambda (key val)
+		      (push (cons key val) entries))
+		  db)
+    (nreverse entries)))
+
+(defun lookup-lisp-file-db (file &optional db-name)
+  (let ((name (file-name-nondirectory file))
+	(db (open-database (or db-name *default-db-name*) nil nil "r")))
+    (do* ((ext '("" ".elc" ".el") (rest ext))
+	 (entry (get-database (concat name (first ext)) db)
+		(get-database (concat name (first ext)) db)))
+	((or entry (null ext)) entry)
+      ())))
+