Re: with-wrapper-hook is obsolete; how to replace it?

[Stefan Monnier]

> How do I alter the code to use add-function instead?
> It's not immediately obvious. That is, if there is source code like this:

I don't think you can do it in a backward-compatible way.
Which is why buffer-substring--filter still uses with-wrapper-hook (but
only to implement the obsolete filter-buffer-substring-functions variable).

> then what should I replace the source code with?

The replacement is that instead of using add-hook on
filter-buffer-substring-functions, clients should now use add-function
on filter-buffer-substring-function.


        Stefan