Re: master c9a8a47ba4: Add new user option 'yank-transform-functions'

[Stefan Monnier <monnier@iro.umontreal.ca>]

Lars Ingebrigtsen [2022-05-19 18:15:45] wrote:
>     * lisp/simple.el (yank-transform-functions): New user option.
>     (yank): Mention it.

Hmm... why is this a user option?
[ Also, tho less importantly: Why is it a list of functions instead of
  being symmetric with Emacs-28's `kill-transform-function`?  ]

Are users expected to be able to make use of this with Custom?  How?

> +@defopt yank-transform-functions
> +This variable is a list of functions.  Each function is called (in
> +order) with the string to be yanked as the parameter, and should
> +return a (possibly transformed) string.  This variable can be set
> +globally, but can also be used to create new commands that are
> +variations on @code{yank}.  For instance, to create a command that
> +works like @code{yank}, but cleans up whitespace before inserting, you
> +could say something like:
> +
> +@lisp
> +(defun yank-with-clean-whitespace ()
> +  (interactive)
> +  (let ((yank-transform-functions
> +	 '(string-clean-whitespace)))
> +    (call-interactively #'yank)))
> +@end lisp
> +@end defopt

This example doesn't call for a `defcustom` but for a `defvar`, no?


        Stefan