Re: Completing with anything

[Antoine Levitt <antoine.levitt@gmail.com>]

24/05/11 05:14, Stefan Monnier
>> > So at least cycling-completion seems fundamentally incompatible with
>> > this idea of abbrev-expansion-after-completion, at least if you want to
>> > allow arbitrarily complex abbrevs like skeletons.
>> Indeed, this is a real problem.
>
> I've now added a :exit-function property that
> completion-at-point-functions can return which is a function that gets
> called when completion is finished.  It operates outside of the
> completion-table, so has access to the buffer text and can do things
> like abbrev-expand.
>
> It gets a status argument which tells it whether the completion is
> `exact' (basically, it's valid according to the completion-table, but
> there may be further completions available), `sole' (it's the only
> completion), and `finished' (not only it's the sole completion, but the
> user is not expected to want to change it).  `sole' is used by cycling,
> so the :exit-function can call abbrev-expand when the status is
> `finished' and it won't interfere with cycling (which simply won't
> benefit from abbrev-expansion).

So, could you add 'failed, which means that no function was able to
complete? That way I could do something like

(setq completion-extra-properties '(:exit-function my-exit-function))

(defun my-exit-function (string finished)
  (when (eq finished 'failed)
    (dabbrev-expand)))

and always get a dabbrev-expand as fallback to completion-at-point?