Hello!
Jan Nieuwenhuizen <jann...@gnu.org> skribis:
> Ludovic Courtès writes:
>
>> In all modesty ;-) I think the API is rather good:
>>
>> scheme@(guile-user)> ,use(guix profiles)
>> scheme@(guile-user)> (profile-search-paths "/home/ludo/.guix-profile")
>> $11 = ((#<<search-path-specification> variable: "PATH" files: ("bin" "sbin")
>> separator: ":" file-type: directory file-pattern: #f> .
>> "/home/ludo/.guix-profile/bin:/home/ludo/.guix-profile/sbin")
>> (#<<search-path-specification> variable: "PYTHONPATH" files:
>> ("lib/python3.6/site-packages") separator: ":" file-type: directory
>> file-pattern: #f> . "/home/ludo/.guix-profile/lib/python3.6/site-packages") …
>
> Whoa, that helps! Is it just me who is so dense -- I really think this
> REPL'y power of Guix is much under-appreciated and would deserve
> more attention.
Heheh, maybe!
> So, what about (thanks to Ricardo via #guile irc and wasamasa via #emacs)
>
> (defun guix-switch-profile (&optional profile)
> "Switch Emacs' environment to PROFILE. PROFILE can be a named
> profile (like ~/.guix-profile, ~/.config/guix/work) or an
> environment (like: echo $GUIX_ENVIRONMENT)."
>
> (interactive "fprofile: ")
> (lexical-let* ((guix-program
> `(begin
> (use-modules (ice-9 match)
> (guix profiles)
> (guix search-paths))
> (let ((specs (profile-search-paths ,(expand-file-name
> profile))))
> (map
> (match-lambda ((spec . dir)
> (list
> (search-path-specification-variable spec)
> (or
> (search-path-specification-separator spec) "")
> dir)))
> specs))))
> (guix-output (guix-eval (format "%S" guix-program)))
> (profile-sexp (car (read-from-string (car guix-output)))))
> (mapcar*
> (lambda (variable separator path)
> (lexical-let ((value (cond ((string-empty-p separator) path)
> ((getenv variable) (concat path separator
> (getenv variable)))
> (t path))))
> (setenv variable value)))
> (mapcar #'car profile-sexp)
> (mapcar #'cadr profile-sexp)
> (mapcar #'caddr profile-sexp))))
>
> and where to put this?
That LGTM! Perhaps you could submit it for inclusion in Emacs-Guix
<https://github.com/alezost/guix.el>?
Thank you,
Ludo’.
