gnu: ert-runner: Adjust ert-runner wrapper to honor EMACSLOADPATH.

* gnu/packages/emacs.scm (ert-runner): Use 'prefix instead of '= for setting
the EMACSLOADPATH environment variable. Reuse the already computed
EMACSLOADPATH for wrap-program. Specify the dependencies directly in the
inputs field.

Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>

gnu/packages/emacs.scm

@@ -6176,13 +6176,6 @@ Emacs.")
 ;; Tests for ert-runner have a circular dependency with ecukes, and therefore
 ;; cannot be run
 (define-public ert-runner
-  (let ((dependencies
-         `(("emacs-ansi" ,emacs-ansi)
-           ("emacs-commander" ,emacs-commander)
-           ("emacs-dash" ,emacs-dash)
-           ("emacs-f" ,emacs-f)
-           ("emacs-s" ,emacs-s)
-           ("emacs-shut-up" ,emacs-shut-up))))
   (package
     (name "ert-runner")
     (version "0.7.0")
@@ -6196,7 +6189,13 @@ Emacs.")
         (base32
          "1657nck9i96a4xgl8crfqq0s8gflzp21pkkzwg6m3z5npjxklgwp"))))
     (build-system emacs-build-system)
-      (inputs dependencies)
+    (inputs
+     `(("emacs-ansi" ,emacs-ansi)
+       ("emacs-commander" ,emacs-commander)
+       ("emacs-dash" ,emacs-dash)
+       ("emacs-f" ,emacs-f)
+       ("emacs-s" ,emacs-s)
+       ("emacs-shut-up" ,emacs-shut-up)))
     (arguments
      `(#:phases
        (modify-phases %standard-phases
@@ -6210,22 +6209,8 @@ Emacs.")
                                  ,name "-" ,version)))
                (install-file "bin/ert-runner" (string-append out "/bin"))
                (wrap-program (string-append out "/bin/ert-runner")
-                   (list "EMACSLOADPATH" ":" '=
-                         (append
-                          ,(match dependencies
-                             (((labels packages) ...)
-                              `(map (lambda (label package version)
-                                      (string-append (assoc-ref inputs label)
-                                                     "/share/emacs/site-lisp/guix.d/"
-                                                     (string-drop package 6)
-                                                     "-" version))
-                                    ',labels
-                                    ',(map package-name packages)
-                                    ',(map package-version packages))))
-                          ;; empty element to include the default load path as
-                          ;; determined by emacs' standard initialization
-                          ;; procedure
-                          (list ""))))
+                 (list "EMACSLOADPATH" ":" 'prefix
+                       (string-split (getenv "EMACSLOADPATH") #\:)))
                #t))))
        #:include (cons* "^reporters/.*\\.el$" %default-include)))
     (home-page "https://github.com/rejeep/ert-runner.el")
@@ -6233,7 +6218,7 @@ Emacs.")
     (description "@code{ert-runner} is a tool for Emacs projects tested
 using ERT.  It assumes a certain test structure setup and can therefore make
 running tests easier.")
-      (license license:gpl3+))))
+    (license license:gpl3+)))
 
 (define-public emacs-disable-mouse
   (package