Re: Limiting number of Incomingxxxx mails

[Reiner Steib <4.uce.03.r.s@nurfuerspam.de>]

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On Fri, Feb 14 2003, Frank Schmitt wrote:

> We have been talking in gnu.emacs.gnus about possibilities of reducing
> the amount of diskspace the Incoming* files need. Perhaps there's
> somebody who thinks our ideas are cool and wants to implement them?
>
> Reiner Steib <4.uce.03.r.s@nurfuerspam.de> writes:
[...]
>> (defcustom mail-source-delete-incoming nil
>>   "*If t, delete incoming files after handling.
>> If a positive number, delete files, older than number days.  If set to the
>> symbol `compress', compress the files.  If it is a negative number, compress
>> the files and delete compressed files older than that number of
>> days.  If nil, never delete."

I have write `mail-source-delete-old-incoming' but the function *needs
review* and testing.  I haven't worked with elisp times and
file-attributes before, so my approach might be too complicated or
complete nonsense. ;-) *Feedback welcome*!

With the attached patch, old (>= 3 days) incoming files will be
deleted (after confirmation!).  You may also test the function without
applying the patch[1]:

,----[ C-h f mail-source-delete-old-incoming RET ]
| mail-source-delete-old-incoming is an interactive Lisp function in `...'.
| (mail-source-delete-old-incoming &optional AGE CONFIRM)
| 
| Remove incoming files older than AGE days.
| If CONFIRM is non-nil, ask for confirmation before removing a file.
`----

`M-: (mail-source-delete-old-incoming 7 t) RET'

If you set gnus-verbose to 10 you'll get lots of debugging output.


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--- mail-source.el.~6.29.~	Mon Feb 17 11:37:23 2003
+++ mail-source.el	Wed Feb 19 20:45:23 2003
@@ -262,8 +262,20 @@
   :group 'mail-source
   :type 'integer)
 
-(defcustom mail-source-delete-incoming nil
-  "*If non-nil, delete incoming files after handling."
+(defcustom mail-source-delete-incoming 3; nil
+  "*If non-nil, delete incoming files after handling.
+If t, delete immediately, if nil, never delete.  If a positive number, delete
+files older than number of days."
+  ;; Note: The removing happens in `mail-source-callback', i.e. no old
+  ;; incoming files will be deleted, unless you receive new mail.
+  ;;
+  ;; You may also set this to `t' and call `mail-source-delete-old-incoming'
+  ;; from a hook or interactively.
+  :group 'mail-source
+  :type 'integer)
+
+(defcustom mail-source-delete-old-incoming-confirm t; nil
+  "*If non-nil, ask for for confirmation before deleting old incoming files."
   :group 'mail-source
   :type 'boolean)
 
@@ -506,6 +518,44 @@
 	  (setq newname (make-temp-name newprefix)))
 	newname))))
 
+(defun mail-source-delete-old-incoming (&optional age confirm)
+  "Remove incoming files older than AGE days.
+If CONFIRM is non-nil, ask for confirmation before removing a file."
+  (interactive "P")
+  (let ((ddays 30) ;; fallback, if no valid AGE given
+	(high2days (/ 65536.0 60 60 24));; convert high bits to days
+	(low2days  (/ 1.0 65536.0))     ;; convert low bits to days
+	diff
+	files ffile bfile filetime fileday currday)
+    (setq diff (if (and (numberp age) (>= age 0))
+		   age
+		 ddays))
+    ;; (gnus-message 1 "Setting `confirm' to `t' (testing!)") ;; To be removed
+    ;; (setq confirm t) (sit-for 1) ;; To be removed
+    (setq
+     files (directory-files
+	    mail-source-directory t 
+	    (concat mail-source-incoming-file-prefix "*"))
+     currday (* (car (current-time)) high2days)
+     currday (+ currday (* low2days (nth 1 (current-time)))))
+    (gnus-message 8 "diff=`%s', currday=`%s'" diff currday);; To be removed
+    (while files
+      (setq
+       ffile (car files)
+       bfile (gnus-replace-in-string ffile "\\`.*/\\([^/]+\\)\\'" "\\1")
+       filetime (nth 5 (file-attributes ffile))
+       fileday (* (car filetime) high2days)
+       fileday (+ fileday (* low2days (nth 1 filetime)))
+       files (cdr files))
+      (gnus-message 9 "File `%s', fileday=`%s', `-c f'=`%s'";; To be removed
+		    bfile fileday (- currday fileday));; To be removed
+      (when (and (> (- currday fileday) diff)
+		 (gnus-message 8 "File `%s' is older than %s day(s)"
+			       bfile diff)
+		 (or (not confirm)
+		     (y-or-n-p (concat "Remove file `" bfile "'? "))))
+	(delete-file ffile)))))
+
 (defun mail-source-callback (callback info)
   "Call CALLBACK on the mail file, and then remove the mail file.
 Pass INFO on to CALLBACK."
@@ -519,7 +569,7 @@
 	(funcall callback mail-source-crash-box info)
       (when (file-exists-p mail-source-crash-box)
 	;; Delete or move the incoming mail out of the way.
-	(if mail-source-delete-incoming
+	(if (eq mail-source-delete-incoming t)
 	    (delete-file mail-source-crash-box)
 	  (let ((incoming
 		 (mail-source-make-complex-temp-name
@@ -528,8 +578,14 @@
 		   mail-source-directory))))
 	    (unless (file-exists-p (file-name-directory incoming))
 	      (make-directory (file-name-directory incoming) t))
-	    (rename-file mail-source-crash-box incoming t)))))))
-
+	    (rename-file mail-source-crash-box incoming t)
+	    ;; remove old incoming files?
+	    (when (and (numberp mail-source-delete-incoming)
+		       (>= mail-source-delete-incoming 0))
+	      (mail-source-delete-old-incoming
+	       mail-source-delete-incoming
+	       mail-source-delete-old-incoming-confirm))))))))
+  
 (defun mail-source-movemail (from to)
   "Move FROM to TO using movemail."
   (if (not (file-writable-p to))

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Bye, Reiner.

[1] Extract `(defun mail-source-delete-old-incoming ...)' from the
    patch, remove the leading "+"-sign and eval it.
-- 
       ,,,
      (o o)
---ooO-(_)-Ooo--- PGP key available via WWW   http://rsteib.home.pages.de/