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Re: Erlang + Emacs profile

From: Zelphir Kaltstahl
Subject: Re: Erlang + Emacs profile
Date: Tue, 30 Jun 2020 20:41:21 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Icedove/68.8.0

Hi Maxim,

Sorry for the incomplete previous e-mail, somehow I hit send, instead of
changing formatting.

So here I go again:

I got around to trying it your way, I think.

I have the manifest file `manifest.scm`:


Then I run the command you wrote: `guix environment -m manifest.scm`,
which created the environment just fine.

Then I created a little Bash script, to make sure to start the separate
Emacs without looking at the normal `~/.emacs.d/init.el` file:

#!/usr/bin/env bash

set -Eeuxo pipefail

emacs --no-init-file --no-desktop --maximized

And Emacs starts up just fine.

Then I run the Elisp code in the *scratch* buffer:

  (require 'org-tempo)                  
  (require 'ob-erlang)
   '((erlang . t)))

Then I try to run the org-mode source block hello world Erlang:

start() ->
        io:format("hello world").

Here however, I get an error logged in my *Messages* buffer:

executing Erlang code block...
append-export-all: Symbol’s function definition is void: string-join

Is there anything I missed?

Best regards,

On 24.06.20 22:29, Maxim Cournoyer wrote:
> Hello Zelphir,
> Zelphir Kaltstahl <> writes:
>> Hello Guix users!
>> What is your way of setting up a profile for Erlang development?
>> There are some things I would like to have, some of which I already
>> managed to get:
>>   * [X] Erlang installed through Guix package manager in a separate profile
>>   * [X] `erl` REPL available in that separate profile
>>   * [X] an Emacs Erlang mode (installed it through M-x list-pack RET and
>>     searched for erlang there)
>>   * [_] org-mode babel erlang for literate programming in org-mode,
>>     using the Guix installed erlang executable – I found
>>, which also seems to work, but
>>     I do not know how to point it to the Guix installed Erlang, so that
>>     it can actually run code. Currently it complains about not finding
>>     Erlang. Does anyone know how to point it to the Erlang executable? I
>>     created this issue:
> It just looks up erl from your PATH, so the problem must be that you
> started Emacs from your user profile, which doesn't know about the
> separate Guix profile you created which contains Erlang.
> You'd have to start Emacs from an shell where your separate profile was
> sourced, or fiddle with M-x setenv to fix this.  emacs-guix also has
> some guix-set-emacs-environment procedure that can be used to augment
> Emacs environment variables given a profile, but it seems broken at the
> moment.
> I just tried the following approach, where everything is managed by Guix
> in a separate profile:
> --8<---------------cut here---------------start------------->8---
> ;; file: manifest.scm
> (specifications->manifest
>  '("erlang"
>    "emacs"
>    "emacs-org"
>    "emacs-erlang"
>    "emacs-ob-erlang")) ;; freshly packaged for you ;-)
> --8<---------------cut here---------------end--------------->8---
> Then spawn an environment with
> guix environment -m manifest.scm
> And then ran the following experiment:
> --8<---------------cut here---------------start------------->8---
> # file:
> Put this in your ~/.emacs or evaluate it ad-hoc before running the
> rest.
> #+begin_src elisp
>   (require 'org-tempo)                        
>   (require 'ob-erlang)
>   (org-babel-do-load-languages
>    'org-babel-load-languages
>    '((erlang . t)))
> #+end_src
> Example taken from:
> With your cursor on the code block, I ran M-x org-babel-execute-src-block
> #+BEGIN_SRC erlang :module tryerlang
> start() ->
>       io:format("hello world").
> And it produced:
> : hello world
> --8<---------------cut here---------------end--------------->8---
> Hope this helps!
> Maxim


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