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Re: Emacs interface for Guix

From: Alex Kost
Subject: Re: Emacs interface for Guix
Date: Fri, 22 Aug 2014 16:44:01 +0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

Ludovic Courtès (2014-08-22 12:56 +0400) wrote:

> Alex Kost <address@hidden> skribis:
>> Thanks, now (with the latest “guix pull”), installing/upgrading/removing
>> should work in "guix.el".  If you (or someone else) wish to try it, you
>> may use:
>>   (setq guix-dry-run t)
>> (It has the same meaning as “--dry-run” option).
> I gave it a try, but AFAICS, when the REPL is started as “internal”,
> guix-main.scm isn’t loaded, and thus “Install” fails:
> scheme@(guile-user)> (process-package-actions #:install '((58935712 "out")) 
> #:upgrade '() #:remove '() #:use-substitutes? #t #:dry-run? #f)
> ;;; <stdin>:11:0: warning: possibly unbound variable `process-package-actions'
> <unnamed port>:11:0: In procedure #<procedure 42ba0c0 at <current input>:11:0 
> ()>:
> <unnamed port>:11:0: In procedure module-lookup: Unbound variable: 
> process-package-actions
> Did I miss something?

I don't understand why you get this, it works for me and I can't
reproduce it with "emacs -Q".  Does the following recipe works for you?:

1. emacs -Q

2. Evaluate the following code (for example, paste it into *scratch*
   buffer and "M-x eval-buffer"):

Attachment: test.el
Description: application/emacs-lisp

3. M-x guix-all-available-packages

4. RET on any package that is not installed and press "Install" button
   in “*Guix Package Info*” buffer.  For me “*Guix REPL*” is shown and
   the following output is printed:

scheme@(guile-user)> (process-package-actions #:install '((151687520 "out")) 
#:upgrade '() #:remove '() #:use-substitutes? #t #:dry-run? #t)
The process begins ...
The following package would be installed:
   a2ps-4.14    out     /gnu/store/1akh02xh4z7i2idfnxbd28zzm87ghav1-a2ps-4.14

substitute-binary: ;;; note: source file 
substitute-binary: ;;;       newer than compiled 
The following derivation would be built:
The following files would be downloaded:
I tried with emacs 24.3.1 and the latest Geiser (from

> Besides, I like M-x guix-generations, pretty cool.  :-)
>> Also I would like to add support for deleting generations (to
>> "guix.el"), so I think it would be good to export ‘delete-generation’
>> from "scripts/package.scm".  WDYT?
> Yes, that makes sense, one could use it from the *Guix Generation List*
> buffer.

Yes, that's what I had in mind: mark generations with "d" and execute a
deletion operation with "x".

> Regarding package installation/removal/upgrade, I think it would be
> great UI-wise to support transactions that perform multiple operations.
> I was initially thinking of something similar to what package.el does:
> marks packages from installation/removal, and then hit ‘x’ to execute
> the transaction.  So the current “Install” and “Delete” buttons could be
> changed to just mark things for installation/removal.

It is already available in a “*Guix Package List*” buffer: you can mark
packages with "d"/"i"/"^" ("u" is for unmarking) and execute an
operation with "x".  As for me, I prefer to keep buttons in a “*Guix
Package Info*” buffer as they are now.  It's just an alternative way to
install/delete a package: if you want to make a transaction of several
actions – use a "list" buffer, if you just want to install some package,
you can do it by pressing a button in "info" buffer.

Alex Kost

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