// vars/feishuStart.groovy 
def call(String webhook, String branch = null) {
    def info = gatherInfo(branch)          // 把分支传进去
    new com.example.FeishuNotifier(this, webhook).send(
        'START',
        env.JOB_NAME,
        env.BUILD_NUMBER,
        info.buildUrl,
        '0s',
        info.branch,
        info.commitMsg,
        info.author,
        info.commitTime,
        info.builder
    )
}