class Jars::MavenExec

def setup(spec = nil, allow_no_file: false)
  spec ||= find_spec(allow_no_file)
  case spec
  when String
    @specfile = File.expand_path(spec)
    @basedir = File.dirname(@specfile)
    Dir.chdir(@basedir) do
      spec = eval(File.read(@specfile), TOPLEVEL_BINDING, @specfile) # rubocop:disable Security/Eval
    end
  when Gem::Specification
    if File.exist?(spec.loaded_from)
      @basedir = spec.gem_dir
      @specfile = spec.loaded_from
    else
      # this happens with bundle and local gems
      # there the spec_file is "not installed" but inside
      # the gem_dir directory
      Dir.chdir(spec.gem_dir) do
        setup(nil, allow_no_file: true)
      end
    end
  when nil
    # ignore
  else
    Jars.debug('spec must be either String or Gem::Specification. ' \
               'File an issue on github if you need it.')
  end
  @spec = spec
end