[oni-notmuch] Update the way the sync output for notmuch is shown

- Show the output in a small window at the bottom of my screen.

- When the sync has completed successfully, close the output window.

- Automatically update the ‘*notmuch-hello*’ buffer when the process ends.

oni-notmuch.el

@@ -4,7 +4,7 @@
 
 ;; Author: Tom Willemse <tom@ryuslash.org>
 ;; Keywords: local
-;; Version: 2023.0622.163614
+;; Version: 2023.0720.222735
 ;; Package-Requires: (oni-sendmail notmuch ol-notmuch)
 
 ;; This program is free software; you can redistribute it and/or modify
@@ -28,6 +28,7 @@
 
 (require 'notmuch)
 (require 'oni-sendmail)
+(require 'shell)
 
 (defun oni-notmuch-search-delete-thread (&optional reverse begin end)
   "Archive and mark all messages in the selected threads for deletion.
@@ -38,12 +39,39 @@ in which to mark thread."
   (notmuch-search-archive-thread reverse begin end)
   (notmuch-search-tag (notmuch-tag-change-list '("deleted") reverse) begin end))
 
+;;; Needs to be available at both run-time and compile-time so that the call to
+;;; the ‘rx’ ‘eval’ construct can evaluate the value at compile-time.
+(eval-and-compile
+  (defconst oni-notmuch-notmuch-new-buffer-name "*notmuch-new*"))
+
+(defun oni-notmuch-notmuch-new-process-sentinel (process signal)
+  "Check the status of PROCESS and close its window if it succeeded.
+Display SIGNAL when the process has finished and refresh the
+‘*notmuch-hello*’ buffer."
+  (and-let* ((succeeded (equal (process-status process) 'exit))
+             (process-window (get-buffer-window (process-buffer process))))
+    (delete-window process-window))
+  (when (memq (process-status process) '(exit signal))
+    (message "%s: %s"
+             (caddr (process-command process))
+             (substring signal 0 -1))
+    (when-let ((buffer (get-buffer "*notmuch-hello*")))
+      (with-current-buffer buffer
+        (notmuch-refresh-this-buffer)))))
+
 (defun oni-notmuch-hello-insert-notmuch-command ()
   "Insert a button to run the notmuch command to synchronize mail."
   (widget-insert "Sync email: ")
   (widget-create 'push-button
                  :notify (lambda (&rest _)
-                           (async-shell-command "notmuch new"))
+                           (let ((process (start-process-shell-command "notmuch-new" oni-notmuch-notmuch-new-buffer-name "notmuch new")))
+                             (with-current-buffer (process-buffer process)
+                               (erase-buffer)
+                               (shell-mode)
+                               (setq-local mode-line-format nil))
+                             (set-process-sentinel process #'oni-notmuch-notmuch-new-process-sentinel)
+                             (set-process-filter process #'comint-output-filter)
+                             (display-buffer (process-buffer process))))
                  "sync")
   (widget-insert "\n"))
 
@@ -52,6 +80,13 @@ in which to mark thread."
 (add-to-list 'notmuch-search-line-faces
              '("deleted" . (:foreground "#3f4242")))
 
+(add-to-list 'display-buffer-alist
+             (cons (rx bos (eval oni-notmuch-notmuch-new-buffer-name) eos)
+                   '(display-buffer-in-side-window
+                     (side . bottom)
+                     (slot . 0)
+                     (window-height . 5))))
+
 (setf (cdr notmuch-hello-sections)
       (cons 'oni-notmuch-hello-insert-notmuch-command (cdr notmuch-hello-sections)))