From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: [ANN] Emacs-Guix 0.4
Date: Thu, 24 May 2018 14:16:36 +0200
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To: Alex Kost <alezost@gmail.com>
Cc: help-guix@gnu.org

Hello!

Alex Kost <alezost@gmail.com> skribis:

> Ludovic Court=C3=A8s (2018-05-23 17:30 +0200) wrote:

[...]

>> I think =E2=80=98guix-dependent-packages=E2=80=99 is going to be very us=
eful.  I wonder
>> if we could have =E2=80=98C-u guix-dependent-packages=E2=80=99 list only=
 packages that
>> are direct dependents?  That would be helpful in some situations.
>
> I agree!  Is there a shell command for this?  I mean I'd like to know
> what Guile code can do this :-)

No, there=E2=80=99s no such command.  Perhaps something to add to =E2=80=98=
guix refresh
-l=E2=80=99, say =E2=80=98guix refresh -l direct=E2=80=99?

> Currently, the following code is used to get dependent packages:
>
>     (with-store store
>       (run-with-store store
>         (mlet %store-monad ((edges (node-back-edges %bag-node-type
>                                                     (all-packages))))
>           (return (node-transitive-edges packages edges)))))

=E2=80=98node-transitive-edges=E2=80=99 traverses the whole DAG, so you sho=
uld simply
call =E2=80=98edges=E2=80=99 instead.

HTH!

Ludo=E2=80=99.