Lisp: Enable rainbow delimiters in SLIME REPL.

.emacs.d/lisp/init-lisp.el

@@ -25,6 +25,11 @@
            (helm-slime-mini)
          (pop-to-buffer (slime-output-buffer))))))
 
+(defun slime-rainbow-init ()
+  (font-lock-mode -1)
+  (rainbow-delimiters-mode)
+  (font-lock-mode))
+
 (with-eval-after-load 'slime
   ;; REVIEW: Fix issue https://github.com/slime/slime/issues/523:
   (setq slime-defpackage-regexp
@@ -51,7 +56,8 @@
     (when (ignore-errors (find-library-name "slime-company"))
       (add-to-list 'slime-extra 'slime-company))
     (slime-setup slime-extra)
-    (add-hook 'slime-repl-mode-hook 'ambrevar/init-lispy)))
+    (add-hook 'slime-repl-mode-hook 'ambrevar/init-lispy)
+    (add-hook 'slime-repl-mode-hook #'slime-rainbow-init)))
 
 (when (require 'helm-slime nil 'noerror)
   (global-helm-slime-mode)