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bug#41732: issue with emacs-lua-mode and emacs-next

From: zimoun
Subject: bug#41732: issue with emacs-lua-mode and emacs-next
Date: Sun, 7 Jun 2020 11:31:41 +0200

Dear Maxim,

On Sun, 7 Jun 2020 at 06:39, Maxim Cournoyer <maxim.cournoyer@gmail.com> wrote:

> Some people have been adding emacs-next-something packages (IIRC); I
> think it's OK for the big, complicated packages that need effort to
> port, but otherwise I wouldn't like seeing this happening for all
> packages.

I agree.  I am not suggesting to duplicate all the packages with
'emacs-next-something'.  There is already enough to do with the
current ones. :-)

> > Well, I am not suggesting to duplicate all the Emacs packages with
> > something like 'emacs-next-<package>' because it is too much.  I am
> > suggesting to provide 'package-with-emacs-next' and then for example
> > in my manifest file I would use this new procedure to generate
> > on-the-fly these next packages; as an expert Emacs mode.
> That sounds like a good idea; provide a way for users to rewrite their
> package at the level of their manifest file (which is already possible
> IIUC).

I propose to provide 'package-with-emacs-next' for the people in the
experimental mood. :-)  For example, the manifest looks like:

--8<---------------cut here---------------start------------->8---
(use-modules (guix build-system emacs)
             (gnu packages emacs)
             (gnu packages emacs-xyz))

 (cons emacs-next
--8<---------------cut here---------------end--------------->8---

Then the expert uses it with:

   guix package -m manifest.scm

Well, the attached patch does that.  And maybe, an entry to the
Cookbook could be worth.

> > I do not know if this proposal makes sense.  Probably not. :-)
> > (My regular Emacs is the current version and I very rarely use
> > emacs-next because I started Emacs with 23 therefore 24 was already a
> > so-nice improvement. :-))
> It does make sense. For those who would like to see our base Emacs
> package be updated to emacs-next, we need to iron out all the packages
> currently failing to build with it.  It is easy to try, by modifying
> slightly a local Guix checkout:
> --8<---------------cut here---------------start------------->8---
> 1 file changed, 1 insertion(+), 1 deletion(-)
> guix/build-system/emacs.scm | 2 +-
> modified   guix/build-system/emacs.scm
> @@ -52,7 +52,7 @@
>    "Return the default Emacs package."
>    ;; Lazily resolve the binding to avoid a circular dependency.
>    (let ((emacs-mod (resolve-interface '(gnu packages emacs))))
> -    (module-ref emacs-mod 'emacs-minimal)))
> +    (module-ref emacs-mod 'emacs-next)))
>  (define* (lower name
>                  #:key source inputs native-inputs outputs system target
> --8<---------------cut here---------------end--------------->8---

What I propose simplifies because it avoids to recompile all Guix and
to use ./pre-inst-env.
Well, I do not know.  It is an half-cooked proposal. :-)

And the added 'package-with-explicit-emacs' procedure allows to use
any Emacs as the VM, so for example, it could be cool to see what
happens with REmacs (which is not packaged but that's another story
Or for example with Gccemacs.

All the best,

Note that 'package-with-explicite-emacs' and
'package-with-explicit-python' should be refactored, another story.

Attachment: 0001-DRAFT-build-system-emacs-Add-new-package-with-emacs-.patch
Description: Text Data

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