Treesitter and LSP further config

init.el

@@ -715,6 +715,8 @@
         (tsx . ("https://github.com/tree-sitter/tree-sitter-typescript" "master" "tsx/src"))
         (ruby . ("https://github.com/tree-sitter/tree-sitter-ruby"))
         (rust . ("https://github.com/tree-sitter/tree-sitter-rust"))
+        (swift . ("https://github.com/tree-sitter/swift-tree-sitter"))
+        (nix . ("https://github.com/nix-community/tree-sitter-nix"))
         (sql . ("https://github.com/m-novikov/tree-sitter-sql"))
         (toml . ("https://github.com/tree-sitter/tree-sitter-toml"))
         (zig . ("https://github.com/GrayJack/tree-sitter-zig"))))
@@ -744,7 +746,7 @@
   :ensure t
   :mode "\\.swift\\'")
 (use-package nix-ts-mode
-  :ensure nil
+  :ensure t
   :mode "\\.nix\\'")
 (use-package html-ts-mode
   :ensure nil
@@ -770,6 +772,7 @@
 
     (c-mode . c-ts-mode)
     (rust-mode . rust-ts-mode)
+    (nix-mode . nix-ts-mode)
     (rustic-mode . rust-ts-mode)
     (python-mode . python-ts-mode)
     (html-mode . html-ts-mode)
@@ -822,6 +825,7 @@
 
 ;; LSP Configuration
 (use-package eglot
+  :ensure nil
   :hook
     (((
        bash-ts-mode