code: function () {
              return gpf.http.post("/fs/src/sources.json", this.toString())
                  .then(function (answer) {
                      var HTTP_ERROR = 500;
                      if (answer.status === HTTP_ERROR) {
                          return dialogs.error(answer.responseText);
                      }
                  });
          }
docs: Save to src/sources.json
  
  @return {Promise} Resolved when saved