switching back to lsp mode until eglot can handle multi-lsps

config.el

@@ -174,6 +174,47 @@
 (after! vertico
   (vertico-mouse-mode))
 
+
+(after! lsp-mode
+  (setq lsp-signature-render-documentation nil)
+
+  (lsp-register-client
+   (make-lsp-client :new-connection (lsp-stdio-connection "nixd")
+                    :major-modes '(nix-mode)
+                    :priority 0
+                    :server-id 'nixd)))
+
+(defun lsp-booster--advice-json-parse (old-fn &rest args)
+  "Try to parse bytecode instead of json."
+  (or
+   (when (equal (following-char) ?#)
+     (let ((bytecode (read (current-buffer))))
+       (when (byte-code-function-p bytecode)
+         (funcall bytecode))))
+   (apply old-fn args)))
+(advice-add (if (progn (require 'json)
+                       (fboundp 'json-parse-buffer))
+                'json-parse-buffer
+              'json-read)
+            :around
+            #'lsp-booster--advice-json-parse)
+
+(defun lsp-booster--advice-final-command (old-fn cmd &optional test?)
+  "Prepend emacs-lsp-booster command to lsp CMD."
+  (let ((orig-result (funcall old-fn cmd test?)))
+    (if (and (not test?)                             ;; for check lsp-server-present?
+             (not (file-remote-p default-directory)) ;; see lsp-resolve-final-command, it would add extra shell wrapper
+             lsp-use-plists
+             (not (functionp 'json-rpc-connection))  ;; native json-rpc
+             (executable-find "emacs-lsp-booster"))
+        (progn
+          (when-let ((command-from-exec-path (executable-find (car orig-result))))  ;; resolve command from exec-path (in case not found in $PATH)
+            (setcar orig-result command-from-exec-path))
+          (message "Using emacs-lsp-booster for %s!" orig-result)
+          (cons "emacs-lsp-booster" orig-result))
+      orig-result)))
+(advice-add 'lsp-resolve-final-command :around #'lsp-booster--advice-final-command)
+
 ;; sly
 (after! sly
   (setq sly-lisp-implementations
@@ -203,7 +244,9 @@
 (add-to-list 'auto-mode-alist '("\\.lsx\\'" . lisp-mode))
 
 (after! nix-mode
-  (set-formatter! 'alejandra '("alejandra" "--quiet") :modes '(nix-mode)))
+  (set-formatter! 'alejandra '("alejandra" "--quiet") :modes '(nix-mode))
+  (setopt lsp-nix-nixd-server-path "nixd"
+   lsp-nix-nixd-formatting-command [ "nixpkgs-alejandra"]))
 
 ;; add platformio to ino files
 (add-to-list 'auto-mode-alist '("\\.ino\\'" . arduino-mode))

init.el

@@ -72,7 +72,7 @@
  ein               ; tame Jupyter notebooks with emacs
  (eval +overlay)    ; run code, run (also, repls)
  (lookup +dictionary +offline +docsets)              ; navigate your code and its documentation
- (lsp +eglot)               ; M-x vscode
+ lsp               ; M-x vscode
  magit             ; a git porcelain for Emacs
  make              ; run make tasks from Emacs
  pdf               ; pdf enhancements