Re: My read-buffer-function doesn't work when called by switch-to-buffer

[Tassilo Horn <tsdh@gnu.org>]

Michael Heerdegen <michael_heerdegen@web.de> writes:

Hi Michael,

>> > Maybe an advice of a higher level function would better fit your
>> > wished-for behavior.
>>
>> Do you have one in mind?
>
> `read-buffer-to-switch'.

Hm, but then it would be pretty specific to `switch-to-buffer' instead
of a general `read-buffer-function'.  E.g., I just found out it's quite
convienient to be able to use `append-to-buffer' to append to a buffer
whose file I haven't found already but is in recentf-list.

>> I haven't checked their implementation but completion-extra-properties
>> is nil and the metadata completion requests also don't return an
>> annotation-function or affixation-function.  Nevertheless, all standard
>> completions are annotated.  I'll have a look how marginalia does it.
>
> They do this:
>
> (advice-add #'completion-metadata-get
>             :before-until #'marginalia--completion-metadata-get)
>
> Looks like this is how they install their annotation-function.

Yes, thanks for the pointer.

>> Anyway, I've played a bit with responding to metadata requests and it
>> looks like it's not really suited for my goal because it seems to
>> assume that the metadata won't change (e.g., category from buffer to
>> file) during a single completion which is obviously a reasonable
>> assumption.
>
> Hmm, yes, that's a problem.  Seems a completion table can only provide
> one kind of metadata for all completions and what you want doesn't fit
> at all into that approach.  See the comment in
> `completion-table-in-turn'.

Agreed.

Bye,
Tassilo