[PATCH v2 1/4] emacs: Asynchronous retrieval of GPG keys

[David Bremner]

David Edmondson <dme at dme.org> writes:

> +(defun notmuch-crypto--async-key-sentinel (process event)
> +  "When the user asks for a GPG key to be retrieved
> +asynchronously, handle completion of that task."
> +  (let ((status (process-status process))
> +	(exit-status (process-exit-status process))
> +	(keyid (process-get process :gpg-key-id)))
> +    (when (memq status '(exit signal))
> +      (message "Getting the GPG key %s asynchronously...%s."
> +	       keyid
> +	       (if (= exit-status 0)
> +		   "completed"
> +		 "failed"))
> +      ;; If the original buffer is still alive and point didn't move
> +      ;; (i.e. the user didn't move on or away), refresh the buffer to
> +      ;; show the updated signature status.

This is a pretty conservative condition for the update.  I can live with
the tradeoff to get non-blocking updates, but I think it will surprise
people used to the button updating to have it not do so when they move
the point away. So I guess this behavior should be documented in a more
user visible way?