[bug#43236] [PATCH emacs-guix] elisp: guix-set-emacs-environment: Also update Emacs' path.

["Jan (janneke) Nieuwenhuizen" <janneke@gnu.org>]

This helps Geiser find the correct (environment's) Guile.

* elisp/guix-misc.el (guix-set-emacs-environment): Set "exec-path"
when setting "PATH" variable.
---
 elisp/guix-misc.el | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/elisp/guix-misc.el b/elisp/guix-misc.el
index 6f79fe6..7e9c068 100644
--- a/elisp/guix-misc.el
+++ b/elisp/guix-misc.el
@@ -1,7 +1,7 @@
 ;;; guix-misc.el --- Miscellaneous definitions  -*- lexical-binding: t -*-
 
 ;; Copyright © 2014–2018 Alex Kost <alezost@gmail.com>
-;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+;; Copyright © 2018,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 
 ;; This file is part of Emacs-Guix.
 
@@ -242,7 +242,9 @@ If PROFILE is nil, use `guix-current-profile'."
               (value (if (and separator current-value)
                          (concat path separator current-value)
                        path)))
-        (setenv variable value)))))
+        (setenv variable value)
+        (when (equalp variable "PATH")
+          (setq exec-path (split-string value ":")))))))
 
 \f
 ;;; Executing guix commands
-- 
Jan Nieuwenhuizen <janneke@gnu.org> | GNU LilyPond http://lilypond.org
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