[PATCH] Only load .spam-stat.el if needed

[PATCH] Only load .spam-stat.el if needed

[Nelson Ferreira]

I noticed a huge delay on every news update because of spam-stat-load,
which had to load everytime a (now) huge file.

This patch attempts to only load when the file was not loaded before,
or somehow it changed on disk:

Please use at will.

diff -u -r7.16 spam-stat.el
--- spam-stat.el        20 May 2004 08:02:41 -0000      7.16
+++ spam-stat.el        1 Jun 2004 22:30:15 -0000
@@ -185,6 +185,9 @@
 this filter, re-training spam-stat with several thousand messages
 will start to take a very long time.")

+(defvar spam-stat-last-saved-at nil
+  "Time stamp of last change of spam-stat-file on this run")
+
 (defvar spam-stat-syntax-table
   (let ((table (copy-syntax-table text-mode-syntax-table)))
     (modify-syntax-entry ?- "w" table)
@@ -400,14 +403,24 @@
                                  (spam-stat-bad entry))))
                   spam-stat)
          (insert ")))"))))
-       (setq spam-stat-dirty nil)))
+       (setq spam-stat-dirty nil)
+       (setq spam-stat-last-saved-at (nth 5 (file-attributes spam-stat-file)))))

 (defun spam-stat-load ()
   "Read the `spam-stat' hash table from disk."
   ;; TODO: maybe we should warn the user if spam-stat-dirty is t?
   (let ((coding-system-for-read spam-stat-coding-system))
-    (load-file spam-stat-file))
-  (setq spam-stat-dirty nil))
+    (cond (spam-stat-dirty (message "Spam stat not loaded: spam-stat-dirty t"))
+         ((or (null spam-stat-last-saved-at)
+              (not (boundp 'spam-stat-last-saved-at))
+              (not (equal spam-stat-last-saved-at
+                          (nth 5 (file-attributes spam-stat-file)))))
+          (progn
+            (load-file spam-stat-file)
+            (setq spam-stat-dirty nil)
+            (setq spam-stat-last-saved-at
+                  (nth 5 (file-attributes spam-stat-file)))))
+         (t (message "Spam stat file not loaded: no change in disk..")))))

 (defun spam-stat-to-hash-table (entries)
   "Turn list ENTRIES into a hash table and store as `spam-stat'.


-- 
Nelson Ferreira