turn off LSP for C++

nvim/lua/config/lsp.lua

@@ -31,14 +31,6 @@ vim.filetype.add({
     cuh = "cuda",
   },
 })
--- clangd
-vim.lsp.config("clangd", {
-  cmd = { "clangd", "--compile-commands-dir=build", "--experimental-modules-support" },
-  capabilities = caps,
-  on_attach = on_attach,
-	filetypes = { "c", "cpp", "cc", "cxx", "c++", "ixx", "cu", "cuh", "cuda" },
-})
-vim.lsp.enable("clangd")
 
 -- rust-analyzer
 vim.lsp.config("rust_analyzer", {
@@ -86,9 +78,19 @@ vim.api.nvim_create_autocmd("BufWritePre", {
   group = vim.api.nvim_create_augroup("AutoFormatOnSave", { clear = true }),
   pattern = "*",
   callback = function()
+    local ext = vim.fn.expand("%:e")
+    local cpp_exts = { cpp = true, cxx = true, hpp = true, ixx = true }
+
+    if cpp_exts[ext] then
+      local filepath = vim.fn.expand("%:p")
+      vim.fn.system({ "clang-format", "-i", filepath })
+      vim.cmd("edit!")  -- reload the buffer after in-place formatting
+      return
+    end
+
     for _, client in pairs(vim.lsp.get_active_clients({ bufnr = 0 })) do
       if client.supports_method("textDocument/formatting") then
-        vim.lsp.buf.format({ async = true, timeout_ms=5000 })
+        vim.lsp.buf.format({ async = false, timeout_ms = 5000 })
         return
       end
     end