code: function (srcPath, options) {
          _.defaults(options || (options = {}), DEFAULT_OPTIONS);
          var separator = options.separator;
          var heads = options.heads;
  
          return _.some(_.map(heads, function (head) {
              var reg = new RegExp('^' + head + separator + '.+\\.styl$');
              return reg.test(path.basename(srcPath));
          }));
      }
docs: isSpriteStylus
  @param {String} srcPath
  @param {Object} options
  @returns {Boolean}
  @example
  var srcPath = 'test/image/sprite/sprite-logo.styl';
  var options = {};
  var out = isSpriteStylus(srcPath, options);
  console.log(out);
  > true