Add nix support

core/cubes/nix.el

@@ -0,0 +1,43 @@
+;;; FG42 --- The mighty editor for the emacsians -*- lexical-binding: t; -*-
+;;
+;; Copyright (c) 2010-2023 Sameer Rahmani & Contributors
+;;
+;; Author: Sameer Rahmani <lxsameer@gnu.org>
+;; URL: https://devheroes.codes/FG42/FG42
+;; Version: 3.0.0
+;;
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+;;
+;;; Commentary:
+;;; Code:
+(require 'fpkg)
+(require 'fg42/cube)
+
+
+(->cube nix-mode
+  "Nix integration for FG42."
+  :mode "\\.nix\\'"
+  :config
+  (progn
+    (when-flag lsp
+      (require 'lsp)
+      (add-to-list 'lsp-language-id-configuration '(nix-mode . "nix"))
+      (lsp-register-client
+       (make-lsp-client :new-connection (lsp-stdio-connection '("rnix-lsp"))
+                        :major-modes '(nix-mode)
+                        :server-id 'nix)))))
+
+
+(provide 'cubes/nix)
+;;; nix.el ends here