Added global_unread() function.

  This shows all unread messages, in all folders.  Awesome.

lumail.lua

@@ -713,3 +713,46 @@ function mark_spam_ip()
    end
 end
 keymap['global']['F'] = 'mark_spam_ip()'
+
+
+
+--
+-- Open all folders that contain unread messages, and view them  all.
+--
+function global_unread()
+
+   -- set the mode appropriately.
+   maildir_limit( "new" );
+   global_mode( "maildir" );
+
+   -- get all visible folders - i.e. those containing unread mails.
+   dirs = current_maildirs();
+
+   -- ensure we have no selected folders.
+   clear_selected_folders();
+
+   offset = 0;
+
+   -- Now for each one we'll add it to the selected set.
+   while( offset <= (count_maildirs() - 1) ) do
+
+      -- jump to folder.
+      jump_maildir_to( offset )
+
+      -- Added the folder to the selected set.
+      add_selected_folder()
+
+      -- move to the next.
+      offset = offset + 1;
+   end
+
+   --
+   -- Now we've added all maildirs with new mail to the list
+   -- of selected maildirs.
+   --
+   -- Jump to the global index-mode, and view only new mails.
+   --
+   --
+   global_mode( "index" );
+   index_limit( "new" );
+end