Add temporary eglot-server-programs workaround for neocaml

Older neocaml versions don't register with eglot-server-programs,
so eglot doesn't know to start ocamllsp.  This workaround adds
the entry if neocaml hasn't done it already.  Safe to remove once
neocaml >= 20260331 is widely available on MELPA.

Author: bbatsov

modules/prelude-ocaml.el

@@ -51,7 +51,21 @@
 ;; get the same setup.
 (use-package neocaml
   :ensure t
-  :hook (neocaml-base-mode . prelude-ocaml-mode-defaults))
+  :hook (neocaml-base-mode . prelude-ocaml-mode-defaults)
+  :config
+  ;; Workaround: register neocaml modes with eglot until neocaml
+  ;; ships this fix itself (neocaml >= 20260331).  add-to-list is
+  ;; a no-op if the entry already exists.
+  (with-eval-after-load 'eglot
+    (unless (cl-some (lambda (entry)
+                       (and (consp (car entry))
+                            (assq 'neocaml-mode (car entry))))
+                     eglot-server-programs)
+      (add-to-list 'eglot-server-programs
+                   '((neocaml-mode :language-id "ocaml")
+                     (neocaml-interface-mode
+                      :language-id "ocaml.interface")
+                     "ocamllsp")))))
 
 ;; OCaml-specific Eglot extensions (requires ocaml-lsp-server).
 ;; Only installed when Eglot is the configured LSP client.