code: function templatesFromStream(templateStream) {
          var firstTemplate = null;
          templateStream.on('data', function(file) {
              var relpath = file.relative;
              var deferred;
              if (registry.hasOwnProperty(relpath)) {
                  deferred = registry[relpath];
              } else {
                  deferred = registry[relpath] = new Deferred();
              }
              try {
                  if (!file.isBuffer()) {
                      throw pluginError('Template source must be buffer');
                  }
                  var template = compile({
                      data: file.contents.toString(),
                      name: file.path,
                      path: file.path
                  });
                  deferred.resolve(template);
                  if (firstTemplate === null) {
                      firstTemplate = template;
                  } else {
                      firstTemplate = false;
                      theOnlyTemplate.reject(pluginError('Multiple templates given, must select one'));
                  }
              } catch(err) {
                  deferred.reject(err);
              }
          }).on('end', function() {
              if (firstTemplate)
                  theOnlyTemplate.resolve(firstTemplate);
              else
                  theOnlyTemplate.reject(pluginError('No templates in template stream'));
              noMoreTemplates();
          }).on('error', function(err) {
              templateStreamError = err;
              noMoreTemplates();
          });
      }
docs: Read templates from a gulp stream