feat: enable lsp in src-blocks; emacs nix tooling

programs/emacs/init.el

@@ -877,6 +877,7 @@ create a new one."
 (add-to-list 'org-structure-template-alist '("el" . "src emacs-lisp"))
 (add-to-list 'org-structure-template-alist '("py" . "src python :results output"))
 (add-to-list 'org-structure-template-alist '("nix" . "src nix :tangle"))
+(add-to-list 'org-structure-template-alist '("nix-ts" . "src nix-ts :tangle"))
 
 (use-package auctex)
 (setq TeX-auto-save t)
@@ -1008,10 +1009,44 @@ create a new one."
 (add-hook 'org-present-mode-quit-hook 'swarsel/org-present-end)
 (add-hook 'org-present-after-navigate-functions 'swarsel/org-present-slide)
 
-(use-package nix-mode)
+(use-package nix-mode
+  :after lsp-mode
+  :ensure t
+  :hook
+  (nix-mode . lsp-deferred) ;; So that envrc mode will work
+  :custom
+  (lsp-disabled-clients '((nix-mode . nix-nil))) ;; Disable nil so that nixd will be used as lsp-server
+  :config
+  (setq lsp-nix-nixd-server-path "nixd"
+        lsp-nix-nixd-formatting-command [ "nixpkgs-fmt" ]
+        lsp-nix-nixd-nixpkgs-expr "import (builtins.getFlake \"/home/swarsel/.dotfiles\").inputs.nixpkgs { }"
+        lsp-nix-nixd-nixos-options-expr "(builtins.getFlake \"/home/swarsel/.dotfiles\").nixosConfigurations.nbl-imba-2.options"
+        lsp-nix-nixd-home-manager-options-expr "(builtins.getFlake \"/home/swarsel/.dotfiles\").nixosConfigurations.nbl-imba-2.options.home-manager.users.type.getSubOptions []"
+        ))
 
-(use-package nix-ts-mode
-  :mode "\\.nix\\'")
+(use-package nix-mode
+  :after lsp-mode
+  :mode "\\.nix\\'"
+  :ensure t
+  :hook
+  (nix-ts-mode . lsp-deferred) ;; So that envrc mode will work
+  :custom
+  (lsp-disabled-clients '((nix-ts-mode . nix-nil))) ;; Disable nil so that nixd will be used as lsp-server
+  :config
+  (setq lsp-nix-nixd-server-path "nixd"
+        lsp-nix-nixd-formatting-command [ "nixpkgs-fmt" ]
+        lsp-nix-nixd-nixpkgs-expr "import (builtins.getFlake \"/home/swarsel/.dotfiles\").inputs.nixpkgs { }"
+        lsp-nix-nixd-nixos-options-expr "(builtins.getFlake \"/home/swarsel/.dotfiles\").nixosConfigurations.nbl-imba-2.options"
+        lsp-nix-nixd-home-manager-options-expr "(builtins.getFlake \"/home/swarsel/.dotfiles\").nixosConfigurations.nbl-imba-2.options.home-manager.users.type.getSubOptions []"
+        ))
+
+
+(with-eval-after-load 'lsp-mode
+  (lsp-register-client
+   (make-lsp-client :new-connection (lsp-stdio-connection "nixd")
+                    :major-modes '(nix-mode nix-ts-mode)
+                    :priority 0
+                    :server-id 'nixd)))
 
 (use-package hcl-mode
   :mode "\\.hcl\\'"
@@ -1365,28 +1400,48 @@ create a new one."
 
 (defalias 'start-lsp-server #'eglot)
 
-(use-package lsp-bridge
-  :ensure nil)
-
 (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")
+  (setq lsp-auto-guess-root "t")
   :commands lsp)
 
-(use-package company)
+;; (use-package company)
+
+;; thanks to https://tecosaur.github.io/emacs-config/config.html#lsp-support-src
+(cl-defmacro lsp-org-babel-enable (lang)
+  "Support LANG in org source code block."
+  (setq centaur-lsp 'lsp-mode)
+  (cl-check-type lang string)
+  (let* ((edit-pre (intern (format "org-babel-edit-prep:%s" lang)))
+         (intern-pre (intern (format "lsp--%s" (symbol-name edit-pre)))))
+    `(progn
+       (defun ,intern-pre (info)
+         (let ((file-name (->> info caddr (alist-get :file))))
+           (unless file-name
+             (setq file-name (make-temp-file "babel-lsp-")))
+           (setq buffer-file-name file-name)
+           (lsp-deferred)))
+       (put ',intern-pre 'function-documentation
+            (format "Enable lsp-mode in the buffer of org source block (%s)."
+                    (upcase ,lang)))
+       (if (fboundp ',edit-pre)
+           (advice-add ',edit-pre :after ',intern-pre)
+         (progn
+           (defun ,edit-pre (info)
+             (,intern-pre info))
+           (put ',edit-pre 'function-documentation
+                (format "Prepare local buffer environment for org source block (%s)."
+                        (upcase ,lang))))))))
+(defvar org-babel-lang-list
+  '( "nix" "nix-ts" "go" "python" "ipython" "bash" "sh" ))
+(dolist (lang org-babel-lang-list)
+  (eval `(lsp-org-babel-enable ,lang)))
 
 (use-package lsp-bridge
   :ensure nil)
 
-(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")
-  :commands lsp)
-
-(use-package company)
-
 (use-package sideline-flymake
   :hook (flymake-mode . sideline-mode)
   :init