mail: Notify when there is no internet connection.

* mail.el (durand-mail-update): When there is no internet connection
  and the command tries to launch a new connection, inform the user
  about the lack of internet connection, so that the user can take
  some action as needed.

1 files changed, 21 insertions, 17 deletions

diff --git a/mail.el b/mail.el
index 4ecddfa..93290c5 100644
--- a/mail.el
+++ b/mail.el
@@ -306,23 +306,27 @@ If FOREGROUND-P is `0', do not fetch mails, but just run
              (= arg 0))
         0)
        ((null arg))))))
-  (cond
-   ((and (numberp foreground-p)
-         (= foreground-p 0))
-    (run-hooks 'durand-mail-update-hook))
-   ((and (not (get-process "durand-mail-update"))
-         (durand-internet-on))
-    (make-process
-     :name "durand-mail-update"
-     :command durand-mail-update-command
-     :filter (cond (foreground-p #'durand-mail-update-filter))
-     :sentinel (cond (foreground-p #'durand-mail-update-sentinel))
-     :buffer (cond
-              (foreground-p
-               (let ((buffer
-                      (get-buffer-create durand-mail-update-buffer)))
-                 (buffer-disable-undo buffer)
-                 buffer)))))))
+  (let ((process-found (get-process "durand-mail-update"))
+        (internet-on (durand-internet-on)))
+    (cond
+     ((and (numberp foreground-p)
+           (= foreground-p 0))
+      (run-hooks 'durand-mail-update-hook))
+     ((and (not process-found) internet-on)
+      (make-process
+       :name "durand-mail-update"
+       :command durand-mail-update-command
+       :filter (cond (foreground-p #'durand-mail-update-filter))
+       :sentinel (cond (foreground-p #'durand-mail-update-sentinel))
+       :buffer (cond
+                (foreground-p
+                 (let ((buffer
+                        (get-buffer-create
+                         durand-mail-update-buffer)))
+                   (buffer-disable-undo buffer)
+                   buffer)))))
+     ((not (or process-found internet-on))
+      (message "There is no internet connection.")))))
 
 (defvar durand-mail-update-timer nil
   "A timer to automatically update mail in the background.")