Re: find-file-project

[Dmitry Gutov]

On 01/20/2016 05:25 AM, Stefan Monnier wrote:
> > Were you going to attach it?
>
> I was, yes.

Thank you.

> > The default method will handle lists/alists/hash-tables and
> > functions.  The specialized methods will handle "dispatchable" types.
>
> Right, but that still requires the a new "dispatchable" kind of
> completion-table.

But why do we care about that? Each backend author could invent their 
own "dispatchable" completion table (with cl-defstruct), or just use

(cons
 'my-special-table
 (lambda (string pred action)
   ...))

> That would allow us to keep using functions (rather than add a new kind
> of completion-table), and simply give them a dispatchable type when we
> need it.

Ah, so they'll be kind of named closure subtypes.

I'm still not sure how I feel about dispatching on such type. E.g. with 
cl-defmethod it would be like adding a new "method" to [the new special 
kind of] function.

Do we really need for the new kind of table to be callable? Because if 
we just use the (cons ...) value above for this purpose, we can be sure 
that nobody will call all-completions on it by mistake (or they'll get a 
very weird result, at least).