[bug#28832] [PATCH 1/3] gnu: Add emacs-json-reformat.

[Alex Kost]

Hello, I have only one addition to the Ludovic's comments.

Oleg Pykhalov (2017-12-15 12:36 +0300) wrote:

[...]
> +(define* (setup-environment #:key inputs #:allow-other-keys)
> +  "Export the variable EMACSLOADPATH, which are based on INPUTS 
> respectively."
> +  (let* ((filtered-inputs (emacs-inputs inputs))
> +         (emacs-input-dir (cdr (assoc "emacs" filtered-inputs)))
> +         (inputs-dirs (cdr filtered-inputs)))
> +    ;; EMACSLOADPATH is where Emacs looks for the source code of the build's
> +    ;; dependencies.
> +    (setenv "EMACSLOADPATH"
> +            (string-append emacs-input-dir "/share/emacs/"
> +                           (store-directory->package-version emacs-input-dir)
> +                           "/lisp"))
> +    (for-each
> +     (lambda (input)
> +       (let ((store-item (cdr input)))
> +         (setenv "EMACSLOADPATH"
> +                 (string-append
> +                  (or (getenv "EMACSLOADPATH") "")
> +                  ":" store-item %install-suffix "/"
> +                  ((compose string-drop-emacs store-directory->package-name)
> +                   store-item)))))
> +     ((compose (lambda (inputs) (alist-delete "emacs" inputs))
> +               (lambda (inputs) (alist-delete "source" inputs)))

"emacs" and "source" may not be the only inputs that should be deleted.
For example, 'emacs-exwm-x' package also has "xhost" and "dbus" inputs.
And your 'string-drop-emacs' will fail on these names, right?

Since there is 'emacs-package?' function in this module, perhaps it
would be better to use it instead (to add only emacs packages to
EMACSLOADPATH), WDYT?

P.S.  Actually, I didn't test your patch, so maybe I just didn't
understand the code properly :-)

-- 
Alex