Enhance nix experience in emacs

doom.d/config.el

@@ -332,6 +332,13 @@ work if it thinks it needs to."
         lsp-rust-analyzer-diagnostics-enable-experimental t
         lsp-rust-analyzer-display-chaining-hints t))
 
+(after! lsp-mode
+  (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)))
+
 (use-package! markdown-mode
   :mode ("README\\.md" . gfm-mode)
   :hook (markdown-mode . variable-pitch-mode)

doom.d/config.org

@@ -514,6 +514,16 @@ Most of these are defaults, but I like having them explicit for my sanity
         lsp-rust-analyzer-diagnostics-enable-experimental t
         lsp-rust-analyzer-display-chaining-hints t))
 #+end_src
+** Nix
+Use rnix-lsp
+#+begin_src emacs-lisp
+(after! lsp-mode
+  (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)))
+#+end_src
 * Composition
 Modes for handling plain text and prose
 ** Markdown

home-manager/common/programs/emacs.nix

@@ -22,6 +22,10 @@
       aspellDicts.en
       aspellDicts.en-science
       aspellDicts.en-computers
+      # For nix
+      rnix-lsp
+      manix
+      nix-doc
       # Desktop file for org-protocol
       (makeDesktopItem {
         name = "org-protocol";