templates/templates.go
func WithBaseDir(dir string) Option {
	return func(o *Options) {
		o.fileFindFunc = func(f string) string {
			return filepath.Join(dir, f)
		}
	}
}
func WithBaseDir(dir string) Option {
	return func(o *Options) {
		o.fileFindFunc = func(f string) string {
			return filepath.Join(dir, f)
		}
	}
}
// WithBaseDir sets the directory in which template files
// are stored.