Revert "#1166 validate user's options (#1177)"

This reverts commit 5bbd3a0a91.

lua/nvim-tree.lua

@@ -311,6 +311,7 @@ end
 local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
   auto_reload_on_write = true,
   disable_netrw = false,
+  hide_root_folder = false,
   hijack_cursor = false,
   hijack_netrw = true,
   hijack_unnamed_buffer_when_opening = false,
@@ -323,7 +324,6 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
   view = {
     width = 30,
     height = 30,
-    hide_root_folder = false,
     side = "left",
     preserve_window_proportions = false,
     number = false,
@@ -360,7 +360,7 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
   },
   ignore_ft_on_setup = {},
   system_open = {
-    cmd = "",
+    cmd = nil,
     args = {},
   },
   diagnostics = {
@@ -429,50 +429,16 @@ local function merge_options(conf)
   return vim.tbl_deep_extend("force", DEFAULT_OPTS, conf or {})
 end
 
-local function validate_options(conf)
-  local msg
-
-  local function validate(user, def, prefix)
-    if type(user) ~= "table" or type(def) ~= "table" or not next(def) then
-      return
-    end
-
-    for k, v in pairs(user) do
-      local invalid
-      if def[k] == nil then
-        invalid = string.format("unknown option: %s%s", prefix, k)
-      elseif type(v) ~= type(def[k]) then
-        invalid = string.format("invalid option: %s%s expected: %s actual: %s", prefix, k, type(def[k]), type(v))
-      end
-
-      if invalid then
-        if msg then
-          msg = string.format("%s | %s", msg, invalid)
-        else
-          msg = string.format("%s", invalid)
-        end
-        user[k] = nil
-      else
-        validate(v, def[k], prefix .. k .. ".")
-      end
-    end
-  end
-
-  validate(conf, DEFAULT_OPTS, "")
-
-  if msg then
-    utils.warn(msg)
-  end
-end
-
 function M.setup(conf)
   legacy.migrate_legacy_options(conf or {})
 
-  validate_options(conf)
-
   local opts = merge_options(conf)
   local netrw_disabled = opts.disable_netrw or opts.hijack_netrw
 
+  if opts.auto_close then
+    utils.warn "auto close feature has been removed, see note in the README (tips & reminder section)"
+  end
+
   _config.update_focused_file = opts.update_focused_file
   _config.open_on_setup = opts.open_on_setup
   _config.open_on_setup_file = opts.open_on_setup_file