Re: Guix records

["Aleix Conchillo Flaqué" <aconchillo@gmail.com>]

Hi Olivier,

Unfortunately I don't have an answer, and actually I didn't even know this
existed, but I'd love to see a library for it. I added something similar
(in terms of syntax) to guile-json (define-json-type) and I'm happy to see
that it seems I was not doing something very stupid. For this specific
record it would be something like:

(define-json-type <employee>
  (age)
  (name)
  (profession))

Which will define a constructor and getters (no setters). However, to
create a new record you have to use the constructor (which is not very
convenient) or use an alist and then use (scm->employee). But it would be
great if one could do:

(employee->json
   (employee
      (age  30)
      (name "Foo")
      (profession "Teacher")))

instead of:

(employee->json
   (scm->employee
      '((age . 30)
        (name . "Foo")
        (profession . "Teacher"))))

It would be fantastic to combine (guix records) and guile-json somehow, but
I'm not sure how.

Sorry I couldn't provide any useful insight.

Best,

Aleix

On Fri, Feb 5, 2021 at 9:24 AM Olivier Dion via General Guile related
discussions <guile-user@gnu.org> wrote:

> Hello,
>
> In the module (guix records), there's some very nice syntax rule
> `define-record-type*` that allows very powerfull declarative style of
> records.  For example:
> ----------------------------------------------------------------------
> (employee
>   (age  30)
>   (name "Foo")
>   (profession "Teacher"))
> ----------------------------------------------------------------------
>
> I would like to use this feature in my software.  However, I don't want
> to have Guix as a dependency only for that.  For now, I've copied the
> content of (guix records) into (my-software records).  But this put
> burden of maitenance into my hands.
>
> Thus, I'm looking for an alternative, perhaps there's a Guile library
> (other than Guix' module) or a SRFI that offers similar feature?
>
> --
> Olivier Dion
> PolyMtl
>
>