Update the awesome modeline after closing a group

emacs/.emacs.d/init.el

@@ -156,6 +156,25 @@ MODE1 is enabled and vice-versa."
                          (and "MariaDB [" (1+ nonl) "]"))
                      "> ")))))
 
+(defun awesome-send (command)
+  "Send COMMAND through awesome-client to awesome."
+  (shell-command (format "echo '%s' | awesome-client" command)))
+
+(defun awesome-update-mailbox (gnus-group)
+  "Update mailcount widget for GNUS-GROUP.
+
+But only if it is a maildir inbox."
+  (let ((name (and
+               (string-match "^nnmaildir\\+\\(.*\\):inbox$" gnus-group)
+               (match-string 1 gnus-group))))
+    (when name
+      (awesome-send (format "mailwidgets.%s:set_mailcount()" name)))))
+
+(defun awesome-update-current-mailbox ()
+  "Update mailcount widget for current gnus group."
+  (when (and (boundp 'gnus-newsgroup-name) gnus-newsgroup-name)
+    (awesome-update-mailbox gnus-newsgroup-name)))
+
 (defun oni:before-save-func ()
   "Function for `before-save-hook'."
   (if (eq major-mode 'html-mode)
@@ -1267,6 +1286,7 @@ from myaethon2.core.decorators import (
 (add-hook 'vala-mode-hook #'oni:vala-mode-func)
 (add-hook 'write-file-hooks 'oni:write-file-func)
 (add-hook 'yas-global-mode-hook 'oni:yas-minor-mode-func)
+(add-hook 'gnus-exit-group-hook 'awesome-update-current-mailbox)
 
 (oni:add-function-to-hooks #'flycheck-mode
   'perl-mode-hook 'rst-mode-hook 'rust-mode-hook 'sh-mode-hook