nvim: set extenstions for autoformatting

dotfiles/.config/nvim/lua/lsp.lua

@@ -12,7 +12,7 @@ local common_on_attach = function(client, bufnr)
     -- Autoformat on save.
     if client.supports_method("textDocument/formatting") then
         vim.api.nvim_create_autocmd("BufWritePre", {
-            buffer = bufnr,
+            pattern = '*.py,*.rs',
             callback = function()
                 vim.lsp.buf.format()
             end,