Add racket lisp package

.config.d/15-lsp.el

@@ -132,15 +132,30 @@ control codes are not supported."
   :init
   (setq inferior-lisp-program "sbcl"))
 
+;; Racket lisp
+(use-package racket-mode
+  :ensure t
+  :defer t
+  :commands (racket-mode racket-xp-mode)
+  :hook ((racket-mode . racket-xp-mode))
+  :bind (("C-c C-n" . racket-run-and-switch-to-repl))
+  :config
+  (setq racket-xp-eldoc-level 'summary))
+
+(defun racket-restart ()
+  "Restarts the backend and reinitializes the mode to cope with the
+consequences of direnv activating after racket-mode(-s)."
+  (interactive)
+  (when (eq major-mode 'racket-mode)
+    (racket-stop-back-end)
+    (racket-start-back-end)
+    (racket-mode)))
+
 ;; Markdown
 (use-package markdown-mode
   :ensure t
   :defer t)
 
-;; Lispy provides structural editing to lisp modes.
-(use-package lispy
-  :defer t)
-
 (if (memq 'lispy-autoloads features)
     (add-hook 'emacs-lisp-mode-hook (lambda () (lispy-mode 1))))