Re: Alternative syntax for interacting with the store monad

[Simon Tournier <zimon.toutoune@gmail.com>]

Hi,

On Sat, 30 Nov 2024 at 17:50, Justin Veilleux <terramorpha@cock.li> wrote:

> (define (list-bind xs f)
>   (apply append! (map f xs)))
>
> (define list-pure list)
>
> (with-monad list-bind list-pure
>             (let ((x (bind '(1 2))))
>               (pure
>                (list
>                 x
>                 (bind '("thing1" "thing2"))))))

In [1], Josselin proposed something à la Haskell:

    (mdo %store-monad
      (drv <- (gexp-derivation "myderivation" test-gexp))
      (output <- (return (derivation->output-path drv)))
      (built-derivations (list drv))
      (return (format #t "~a~%" output)))

Well, the conclusion seems that « it’s normally not necessary to use the
monadic interface unless you’re getting into internals or writing a new
tool. »  Therefore, I do not know if improving the syntax is worth.

Cheers,
simon


1: Re: Viewing derivation output in the store
Josselin Poiret <dev@jpoiret.xyz>
Thu, 21 Apr 2022 09:44:05 +0200
id:87v8v2g9tm.fsf@jpoiret.xyz
https://lists.gnu.org/archive/html/guix-devel/2022-04
https://yhetil.org/guix/87v8v2g9tm.fsf@jpoiret.xyz