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Re: [Emacs-diffs] master b75fb81 1/4: Extend button.el to take callback

From: Lars Ingebrigtsen
Subject: Re: [Emacs-diffs] master b75fb81 1/4: Extend button.el to take callback data
Date: Fri, 02 Aug 2019 20:41:51 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Stefan Monnier <address@hidden> writes:

>>       (make-text-button start (point)
>>                      'face 'rcirc-url
>>                      'follow-link t
>>                      'burron-data url
>>                      'action #'browse-url)
> Odd.  I thought the benefit was for
>     (define-button-type 'my-type 'action #'browse-url)
>     [...]
>        (make-text-button start (point)
>                          'type 'my-type
>                          'burron-data url)
> where a closure is not an option.

Ah, yes, that seems useful.

> In this for the purpose of designing new APIs, we can take it for
> granted that lexical-scoping is available.  It's easy enough to convert
> an old package to use lexical-scoping.

In this case, I just wanted to rewrite some stuff to avoid using
widgets, which can be rather convoluted to reason about.  But it does
have callback values like this, so this brings button a feature to make
conversion easier.

But, yes, everything should be converted to lexical binding, and then
my example use case is much less of a thing.

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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