Re: unload-feature questions and thoughts

["Juanma Barranquero" <lekktu@gmail.com>]

On 2/4/07, David Kastrup <dak@gnu.org> wrote:

> It defines tex-site-unload-hook already.  But "whatever is necessary"
> pretty much means restoring all functions overwritten by AUCTeX, and
> there is no point in not using the autoload unloader for that.

In fact (and this is not a proposal, at least not now), the current
working of `unload-feature' is a bit puzzling. Instead of running
either `FEATURE-unload-hook' (if found) or its normal heuristics, it'd
be better if it ran a FEATURE-unload-function, which would return t to
stop, or nil to *also* use the function's current heuristics. That
way, a package could define a FEATURE-unload-function to undo unusual
things, and leave the burden of the unloading to `unload-feature'.

I imagine it could be faked right now with:

  (defun myfeature-unload-hook ()
   ;; Undo unusual things, then:
   (let ((fun (symbol-function 'myfeature-unload-hook)))
     (fmakunbound 'myfeature-unload-hook)
     (ignore-errors (unload-feature 'myfeature))
     (fset 'myfeature-unload-hook fun)))

which is quite ugly, but it should work.

                    /L/e/k/t/u