code: function(file) {
      var html   = filter.get('tag', fss.filetype(file))('test');
      var prefix = config.root ? config.root : '';
      var suffix = config.timestamp && html ? '?v=' + config.time : '';
      var encode = fss.relative(file).replace(/\s/g, '%20');
      return path.join(prefix, encode) + suffix;
  }
docs: /*
  Get the complete path for a cached file.
  HTML-included files need their build timestamp.