lang/nix: add a repl handler

modules/lang/nix/autoload.el

@@ -5,6 +5,13 @@
    (nixos-options-doc-buffer
     (nixos-options-get-documentation-for-option candidate))))
 
+;;;###autoload
+(defun +nix/open-repl ()
+  "Open a nix repl."
+  (interactive)
+  (nix-repl-show)
+  (current-buffer))
+
 ;;;###autoload
 (defun +nix/lookup-option (&optional initial-input)
   "Look up documentation on a nix option."

modules/lang/nix/config.el

@@ -4,6 +4,7 @@
   :interpreter ("\\(?:cached-\\)?nix-shell" . +nix-shell-init-mode)
   :mode "\\.nix\\'"
   :config
+  (set-repl-handler! 'nix-mode #'+nix/open-repl)
   (set-company-backend! 'nix-mode 'company-nixos-options)
   (set-lookup-handlers! 'nix-mode
     :documentation '(+nix/lookup-option :async t))