gnu: Add emacs-julia-mode.

* gnu/packages/emacs.scm (emacs-julia-mode): New variable.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/emacs.scm

@@ -3371,6 +3371,40 @@ (define-public emacs-eprime
 E-Prime forbids the use of the \"to be\" form to strengthen your writing.")
       (license license:gpl3+))))
 
+(define-public emacs-julia-mode
+  ;; XXX: Upstream version remained stuck at 0.3.  See
+  ;; <https://github.com/JuliaEditorSupport/julia-emacs/issues/46>.
+  (let ((commit "115d4dc8a07445301772da8376b232fa8c7168f4")
+        (revision "1"))
+    (package
+      (name "emacs-julia-mode")
+      (version (string-append "0.3-" revision "." (string-take commit 8)))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/JuliaEditorSupport/julia-emacs.git")
+               (commit commit)))
+         (file-name (string-append name "-" version "-checkout"))
+         (sha256
+          (base32
+           "1is4dcv6blslpzbjcg8l2jpxi8xj96q4cm0nxjxsyswpm8bw8ki0"))))
+      (build-system emacs-build-system)
+      (arguments
+       `(#:phases
+         (modify-phases %standard-phases
+           (add-before 'install 'check
+             (lambda _
+               (zero? (system* "emacs" "-batch"
+                               "-l" "julia-mode.el"
+                               "-l" "julia-mode-tests.el"
+                               "-f" "ert-run-tests-batch-and-exit")))))))
+      (home-page "https://github.com/JuliaEditorSupport/julia-emacs")
+      (synopsis "Major mode for Julia")
+      (description "This Emacs package provides a mode for the Julia
+programming language.")
+      (license license:expat))))
+
 (define-public emacs-ess
   (package
     (name "emacs-ess")