[bug#38769] [PATCH] import: Add importer for MELPA packages.

[Christopher Baines]

Carlo Zancanaro <carlo@zancanaro.id.au> writes:

> Hey Brett!
>
> It's been a while, but I've finally found time to revisit this
> patch.
>
> On Wed, Jan 08 2020, Brett Gilio wrote:
>> ... we /should/ combine this with the ELPA importer in its
>> current tradition: `guix import elpa -a melpa`. That seems
>> preferable to me, as it would avoid the need to deprecate a
>> command flag in our UX.
>
> I've done this.

I've had a go at trying this out, I tried importing ack from elpa and a
from melpa, and it seemed to work OK. The packages built at least, and
the outputs look reasonable.

Looking at the code, elpa-package->sexp is a little awkward, the code
would probably be clearer if the (or ...) bits in the package sexp were
moved out in to functions that deal with generating that part of the
package.

It seems to work though, so I'm happy to push this. Is this patch still
relevant?

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