notmuch: Poll new mails asynchronously and fix GPG decrypt issue.

.emacs.d/lisp/init-notmuch.el

@@ -84,19 +84,39 @@
                                          " ")))
       (notmuch-search (format "%s %s" address merged-addresses)))))
 
-;; (advice-add 'debbugs-gnu-select-report :override #'debbugs-notmuch-select-report)
+(defun ambrevar/notmuch-poll-async ()
+  "Like `notmuch-poll' but asynchronous."
+  (notmuch-start-notmuch
+   "notmuch-new"
+   nil
+   (lambda (_proc change)
+     (with-current-buffer (find-if (lambda (b)
+                                     (with-current-buffer b
+                                       (eq major-mode 'notmuch-search-mode)))
+                                   (buffer-list))
+       (notmuch-refresh-this-buffer))
+     (message "notmuch-new: %s" change))
+   "new"))
 
-;; TODO: This is a bit brittle since it only works if ~/.authinfo.gpg exists.
+;; TODO: This is a bit brittle since it only works if the given gpg file exists.
 ;; Is there a way to unlock gpg manually without a file?
-(defun ambrevar/gpg-unlock ()
-  "Unlock GPG."
+(defun ambrevar/notmuch-poll-after-gpg-unlock ()
+  "Unlock GPG and get Notmuch mail."
+  ;; The gpg unlock needs to be asynchronous for EXWM, or else pinentry-emacs
+  ;; will be blocked.
   (let ((sentinel (lambda (_process _args)
-                    (notmuch-poll)
-                    (notmuch-refresh-this-buffer))))
+                    (ambrevar/notmuch-poll-async))))
     (make-process :name "gpg" :buffer nil
-                  :command (list "gpg" "--decrypt" (expand-file-name "~/.authinfo.gpg"))
+                  :command (list "gpg" "--decrypt"
+                                 (expand-file-name
+                                  (or (find-if (lambda (agenda) (string-suffix-p ".gpg" agenda))
+                                               org-agenda-files)
+                                      (error "No .gpg file in `org-agenda-files'."))))
                   :sentinel sentinel)))
 
-(advice-add 'notmuch-poll-and-refresh-this-buffer :override #'ambrevar/gpg-unlock)
+(advice-add 'notmuch-poll-and-refresh-this-buffer
+            :override #'ambrevar/notmuch-poll-after-gpg-unlock)
+
+;; (advice-add 'debbugs-gnu-select-report :override #'debbugs-notmuch-select-report)
 
 (provide 'init-notmuch)