Casual-eshell error on eshell-delete-output

[zenshinji]

I get the following error when I call casual-eshell-tmenu:

transient-setup: Suffix command eshell-delete-output is not defined or autoloaded

I looked through the eshell source and can't find that function. Does it live in some custom code or another package?

Or should it be eshell-kill-output, which is bound to C-o in eshell-command-map?

Also, I'm on 29.4 (GNU Emacs 29.4 (build 1, aarch64-apple-darwin24.5.0, Carbon Version 170 AppKit 2575.6) of 2025-06-15), so maybe it's defined in a newer release?

[kickingvegas]

Thanks for reporting this. Apparently eshell-kill-output has been obsoleted in 30.1

https://github.com/emacs-mirror/emacs/blob/87cae92e7cbbc7a6eb6558d7bd9238b56db35f57/lisp/eshell/esh-mode.el#L836

I can try to figure out a way to backport but no promises. This is also low on my priority list.

A possible workaround is to update your install of eshell. You will need to set package-install-upgrade-built-in to t.

[zenshinji]

There's no trivial way to upgrade eshell that I could see, so I simply pasted the new function in my config:

(defun eshell-delete-output (&optional kill)
  "Delete all output from interpreter since last input.
If KILL is non-nil (interactively, the prefix), save the killed text in
the kill ring.

This command does not delete the prompt."
  (interactive "P")
  (save-excursion
    (goto-char (eshell-beginning-of-output))
    (insert "*** output flushed ***\n")
    (when kill
      (copy-region-as-kill (point) (eshell-end-of-output)))
    (delete-region (point) (eshell-end-of-output))))

It works fine for me, it seems. Do I need to autoload it since I'm loading it from elsewhere at eshell's load time?

[kickingvegas]

@zenshinji Brute force ftw. Dunno if you really need to autoload but if you do then go with what works.