Function update_head_commit

src/utils/head.rs:67–79

将当前的head指向commit_hash，根据当前的head类型，更新不同的文件 */

(commit_hash: &String)

/** 将当前的head指向commit_hash，根据当前的head类型，更新不同的文件 */
pub fn update_head_commit(commit_hash: &String) {
    let head = current_head();
    match head {
        Head::Branch(branch_name) => {
            update_branch(&branch_name, commit_hash);
        }
        Head::Detached(_) => {
            let mut head = util::get_storage_path().unwrap();
            head.push("HEAD");
            std::fs::write(head, commit_hash).expect("无法写入HEAD");
        }
    }
}

/** 列出本地的branch */
pub fn list_local_branches() -> Vec<String> {