+ (concat notmuch-command " show --format=raw "
+ (shell-quote-argument (notmuch-show-get-message-id)) " | " command)))
+ (let ((buf (get-buffer-create (concat "*notmuch-pipe*"))))
+ (with-current-buffer buf
+ (setq buffer-read-only nil)
+ (erase-buffer)
+ (let ((exit-code (call-process-shell-command shell-command nil buf)))
+ (goto-char (point-max))
+ (set-buffer-modified-p nil)
+ (setq buffer-read-only t)
+ (unless (zerop exit-code)
+ (switch-to-buffer-other-window buf)
+ (message (format "Command '%s' exited abnormally with code %d"
+ shell-command exit-code))))))))
+
+(defun notmuch-show-add-tags-worker (current-tags add-tags)
+ "Add to `current-tags' with any tags from `add-tags' not
+currently present and return the result."
+ (let ((result-tags (copy-sequence current-tags)))
+ (mapc (lambda (add-tag)
+ (unless (member add-tag current-tags)
+ (setq result-tags (push add-tag result-tags))))
+ add-tags)
+ (sort result-tags 'string<)))
+
+(defun notmuch-show-del-tags-worker (current-tags del-tags)
+ "Remove any tags in `del-tags' from `current-tags' and return
+the result."
+ (let ((result-tags (copy-sequence current-tags)))
+ (mapc (lambda (del-tag)
+ (setq result-tags (delete del-tag result-tags)))
+ del-tags)
+ result-tags))