class Zeitwerk::GemLoader

def self.__new(root_file, namespace:, warn_on_extra_files:)
  new(root_file, namespace: namespace, warn_on_extra_files: warn_on_extra_files)
end

def initialize(root_file, namespace:, warn_on_extra_files:)
  super()
  @tag = File.basename(root_file, ".rb")
  @tag = real_mod_name(namespace) + "-" + @tag unless namespace.equal?(Object)
  @inflector           = GemInflector.new(root_file)
  @root_file           = File.expand_path(root_file)
  @root_dir            = File.dirname(root_file)
  @warn_on_extra_files = warn_on_extra_files
  push_dir(@root_dir, namespace: namespace)
end

def setup
  warn_on_extra_files if @warn_on_extra_files
  super
end

def warn_on_extra_files
  expected_namespace_dir = @root_file.delete_suffix(".rb")
  ls(@root_dir) do |basename, abspath|
    next if abspath == @root_file
    next if abspath == expected_namespace_dir
    basename_without_ext = basename.delete_suffix(".rb")
    cname = inflector.camelize(basename_without_ext, abspath).to_sym
    ftype = dir?(abspath) ? "directory" : "file"
    warn(<<~EOS)
      WARNING: Zeitwerk defines the constant #{cname} after the #{ftype}
          #{abspath}
      To prevent that, please configure the loader to ignore it:
          loader.ignore("\#{__dir__}/#{basename}")
      Otherwise, there is a flag to silence this warning:
          Zeitwerk::Loader.for_gem(warn_on_extra_files: false)
    EOS
  end
end