Re: [ANN] Emacs-Guix 0.4

[Alex Kost]

Ludovic Courtès (2018-05-24 14:16 +0200) wrote:

> Hello!
>
> Alex Kost <address@hidden> skribis:
>
>> Ludovic Courtès (2018-05-23 17:30 +0200) wrote:
>
> [...]
>
>>> I think ‘guix-dependent-packages’ is going to be very useful.  I wonder
>>> if we could have ‘C-u guix-dependent-packages’ 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’s no such command.  Perhaps something to add to ‘guix refresh
> -l’, say ‘guix refresh -l direct’?

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)))))
>
> ‘node-transitive-edges’ traverses the whole DAG, so you should simply
> call ‘edges’ 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 :-)

-- 
Alex