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Re: Proof of Concept: Import Emacs' use-packaged packages into Guix' man
From: |
Andrew Tropin |
Subject: |
Re: Proof of Concept: Import Emacs' use-packaged packages into Guix' manifest.scm |
Date: |
Tue, 20 Dec 2022 19:06:48 +0400 |
On 2022-12-20 09:16, Mekeor Melire wrote:
> 2022-12-18 09:11 liliana.prikler@gmail.com:
>
>> I think we should be able to build an Emacs service in Guix Home that can
>> manage init.el. As a workaround, use-package should also have a :when
>> clause, so you can use :when (featurep 'some-package-autoloads) if you're
>> unsure whether 'some-package is actually installed. This makes your init
>> file a little more resilient and is particularly useful with pure shells.
>
> =guix home import= for init.el is a great idea! (See below for use-cases.)
>
> And yes, =:when (featurep 'some-package-autoloads)= is a workaround that
> makes
> init.el files loadable even if respective packages are not available. But the
> submitted code aims to enable you to install needed emacs-packages so that
> such a restricting workaround is not needed.
>
>> Given the caveats, I would rather like to see an Emacs Lisp based script
>> that mocks use-package and generates a manifest by evaluting init.el. This
>> should give you more correct results. It's not a bad idea per se, but as-is,
>> I think it would better be maintained in your own channel before
>> upstreaming.
>
> Problem is that in cases where needed packages are not installed and the user
> did not add =:when (featurep 'foo)= everywhere, it's possible that evaluating
> init.el will fail because of some package not being available. Thus, IMHO, we
> can't rely on Emacs to evaluate the init.el. But we could use Emacs to expand
> the (use-package) macros inside init.el. But I doubt that it's worth it. I
> rather think it's easier to use Guile to parse invocations of =require= and
> =use-package=.
>
>> For upstreaming, I see two potential paths. The first one would be
>> integration to `guix home import', which Andrew Tropin (CC'd) could probably
>> tell you more on. The second would be integration into `guix package' as a
>> callable function/command line argument, but IMHO that's less likely to
>> pass.
>
> All in all, I think there are three use-cases:
>
> - If you want Guix Home to handle the installation of emacs- packages, there
> should be =guix home import= to automatically install those packages, as
> resulting from early- and init.el files.
guix home import doesn't install anything, it only generates a configuration.
>
> - If you simply want to install all emacs- packages once per CLI, there
> should
> be =guix package --install-from-elisp-file=~/.emacs.d/init.el= and similar
> CLI-arguments or -commands, such as --install-from-elisp-expression,
> --install-from-elisp-init-files. There could also be --fit-to-elisp-
> variants which not only install packages, but also remove redundant, unused
> emacs-* packages.
I don't think we want a separate tricky flags here. Especially we don't
want some implicit logic removing unused packages. Just
--8<---------------cut here---------------start------------->8---
guix package --install-from-expression=\
((@ (mekeor emacs-helper) generate-package-from-elisp) \
#:elisp (local-file "./init.el"))
--8<---------------cut here---------------end--------------->8---
should be enough. If you want to be sure unused packages are not
installed just don't use imperative guix package and maintain you
configuration in declarative manner.
>
> - If you want to use a manifest.scm for your Guix user-profile and
> import appropriate emacs- therein, there should be Guile modules and
> functions which allow to do so, as the submitted code does. Those
> modules could also be used with =guix package -e=.
>
> And in all three cases, your early- and init.el files might load packages via
> =require= or =use-package= at least.
--
Best regards,
Andrew Tropin
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