chore: add old option detection in plugin/nvim-tree.lua

plugin/nvim-tree-startup.lua

@@ -0,0 +1,34 @@
+local is_initialized = false
+
+if is_initialized then
+  return
+end
+is_initialized = true
+
+local out_config = {
+  "nvim_tree_disable_netrw",
+  "nvim_tree_hijack_netrw",
+  "nvim_tree_auto_open",
+  "nvim_tree_auto_close",
+  "nvim_tree_tab_open",
+  "nvim_tree_update_cwd",
+  "nvim_tree_hijack_cursor",
+  "nvim_tree_system_open_command",
+  "nvim_tree_system_open_command_args",
+  "nvim_tree_follow",
+  "nvim_tree_follow_update_path",
+  "nvim_tree_lsp_diagnostics",
+  "nvim_tree_auto_resize",
+  "nvim_tree_bindings",
+  "nvim_tree_disable_keybindings",
+  "nvim_tree_disable_default_keybindings",
+}
+
+local x = vim.tbl_filter(function(v)
+  return vim.fn.exists('g:'..v) ~= 0
+end, out_config)
+
+if #x > 0 then
+  local msg = "following options are now set in the setup (:help nvim-tree.setup): "
+  require'nvim-tree.utils'.echo_warning(msg..table.concat(x, " | "))
+end