From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alex Kost <alezost@gmail.com>
Subject: Re: [ANN] Emacs-Guix 0.4
Date: Thu, 24 May 2018 20:21:16 +0300
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In-Reply-To: <87y3g9uu3f.fsf@gnu.org> ("Ludovic
	\=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
	\=\?utf-8\?Q\?s\?\= message of "Thu, 24 May 2018 14:16:36 +0200")
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To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: help-guix@gnu.org

Ludovic Court=C3=A8s (2018-05-24 14:16 +0200) wrote:

> 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 u=
seful.  I wonder
>>> if we could have =E2=80=98C-u guix-dependent-packages=E2=80=99 list onl=
y 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=
=98guix refresh
> -l=E2=80=99, say =E2=80=98guix refresh -l direct=E2=80=99?

It would be good!

>> 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 s=
hould simply
> call =E2=80=98edges=E2=80=99 instead.
>
> HTH!

Yes, now it's clear, thanks!

I recalled that C-u prefix is already occupied by specifying an
arbitrary profile for the package commands.  So, I'm afraid instead of
"C-u M-x guix-dependent-packages" there will be "M-x
guix-direct-dependent-packages".

Or maybe I should just break this dull "convention" (I mean "C-u" for
profiles) as probably no one uses it anyway :-)

--=20
Alex