Add arduino stuff

init.el

@@ -1480,7 +1480,11 @@ With PROJECT, give diagnostics for all buffers in the current project."
                        "--clang-tidy" "--completion-style=detailed"
                        "--header-insertion=never" "--pch-storage=memory"
                        "--function-arg-placeholders"
-                       "--compile-commands-dir=build"))))
+                       "--compile-commands-dir=build")))
+  ;; this should come after the above
+  (add-to-list 'eglot-server-programs
+               (cons '(arduino-ts-mode)
+                     '("arduino-language-server"))))
 (use-package eglot-inactive-regions
   :custom
   (eglot-inactive-regions-style 'darken-foreground)
@@ -1951,7 +1955,18 @@ If inside a comment and in multi-line comment mode, act as
     "gO" #'my/find-other-file-other-window)
   (evil-define-key 'normal 'objc-mode-map
     "go" #'my/find-other-file
-    "gO" #'my/find-other-file-other-window))
+    "gO" #'my/find-other-file-other-window)
+  (defun -arduino-ts-mode-set-modeline (oldfun)
+    "Override the modeline set by c++-ts-mode.
+This is :around advice, so OLDFUN is the real function
+`c-ts-mode-set-modeline'."
+    (if (not (eq major-mode 'arduino-ts-mode))
+        (funcall oldfun)
+      (setq mode-name (concat "Arduino C++" (string-trim-right comment-start)))
+      (force-mode-line-update)))
+  (advice-add 'c-ts-mode-set-modeline :around #'-arduino-ts-mode-set-modeline))
+(define-derived-mode arduino-ts-mode c++-ts-mode "Arduino C")
+(add-to-list 'auto-mode-alist '("\\.ino\\'" . arduino-ts-mode))
 
 ;; GLSL
 (use-package glsl-mode)