Trying to configure lsp-mode on Emacs

users/profiles/emacs/emacs.d/config/config-lsp.el

@@ -0,0 +1,32 @@
+(defun my-lsp-format-buffer ()
+  (if (eq major-mode 'nix-mode)
+      (lsp-format-buffer)))
+
+
+(use-package lsp-mode
+  :init
+  ;; set prefix for lsp-command-keymap (few alternatives - "C-l", "C-c l")
+  (setq lsp-keymap-prefix "C-c l")
+  :hook (;; replace XXX-mode with concrete major-mode(e. g. python-mode)
+         (nix-mode . lsp)
+         ;; if you want which-key integration
+         (lsp-mode . lsp-enable-which-key-integration))
+         (before-save . my-lsp-format-buffer)
+  :commands lsp)
+
+;; optionally
+(use-package lsp-ui :commands lsp-ui-mode)
+;; if you are helm user
+(use-package helm-lsp :commands helm-lsp-workspace-symbol)
+(use-package lsp-treemacs :commands lsp-treemacs-errors-list)
+
+;; optionally if you want to use debugger
+(use-package dap-mode)
+;; (use-package dap-LANGUAGE) to load the dap adapter for your language
+
+;; optional if you want which-key integration
+(use-package which-key
+    :config
+    (which-key-mode))
+
+(provide 'config-lsp)