use git_repository as git;use git_repository::Reference; fn main() -> Result<(), Box<dyn std::error::Error>> {    let mut repo = git::discover(".")?.apply_environment();    println!(        "Repo: {}",        repo.work_dir().as_deref().unwrap_or(repo.git_dir()).display()    );    let mut max_commit_size = 0;    let mut avg_commit_size = 0;    repo.object_cache_size(32 * 1024);    let commit_ids = repo        .head()?        .into_fully_peeled_id()        .ok_or_else(|| "There are no commits - nothing to do here.")??        .ancestors()        .all()        .inspect(|id| {            if let Ok(Ok(object)) = id.as_ref().map(|id| id.object()) {                avg_commit_size += object.data.len();                if object.data.len() > max_commit_size {                    max_commit_size = object.data.len();                }            }        })        .collect::<Result<Vec<_>, _>>()?;    println!("Num Commits: {}", commit_ids.len());    println!("Max commit Size: {}", max_commit_size);    println!("Avg commit Size: {}", avg_commit_size / commit_ids.len());    assert!(!commit_ids.is_empty(), "checked that before");     let last_commit_id = &commit_ids[0];    println!("Most recent commit message");     let object = last_commit_id.object()?;    let commit = object.into_commit();    println!("{}", commit.message_raw()?);     let tree = commit.tree()?;     let mut delegate = visit::Tree::new(repo.clone());    tree.traverse().breadthfirst(&mut delegate)?;    let _files = tree.traverse().breadthfirst.files()?;     println!("num trees: {}", delegate.num_trees);    println!("num blobs: {}", delegate.num_blobs);    println!("num blobs_executable: {}", delegate.num_blobs_exec);    println!("num links: {}", delegate.num_links);    println!("num submodules: {}", delegate.num_submodules);    println!("total size in bytes: {}\n", delegate.num_bytes);     // let num_branches = repo.branches()?;    // let num_branches = repo.branches.remote("origin")?;    let num_branches = repo.references()?.prefixed("refs/heads/")?.count();    let num_remote_branches = repo.references()?.prefixed("refs/remotes/")?.count();    let num_tags = repo.references()?.prefixed("refs/tags/")?.count();    let broken_refs = repo        .references()?        .all()?        .filter_map(Result::ok)        .filter_map(|r: Reference| r.into_fully_peeled_id().err())        .count();    let inaccessible_refs = repo.references()?.all()?.filter(Result::is_err).count();     println!("num local branches: {}", num_branches);    println!("num remote branches: {}", num_remote_branches);    println!("num tags: {}", num_tags);    println!("refs with inaccessible objects: {}", broken_refs);    println!("inaccessible refs: {}", inaccessible_refs);     Ok(())} mod visit {    use git_hash::oid;    use git_object::{bstr::BStr, tree::EntryRef};    use git_repository as git;    use git_traverse::tree::visit::Action;     pub(crate) struct Tree {        pub num_trees: usize,        pub num_links: usize,        pub num_blobs: usize,        pub num_blobs_exec: usize,        pub num_submodules: usize,        pub num_bytes: u64,        pub repo: git::Repository,    }     impl Tree {        pub fn new(repo: git::Repository) -> Self {            Tree {                num_trees: 0,                num_links: 0,                num_blobs: 0,                num_blobs_exec: 0,                num_submodules: 0,                num_bytes: 0,                repo,            }        }         pub(crate) fn count_bytes(&mut self, oid: &oid) {            if let Ok(obj) = self.repo.find_object(oid) {                self.num_bytes += obj.data.len() as u64;            }        }    }    impl git_traverse::tree::Visit for Tree {        fn pop_front_tracked_path_and_set_current(&mut self) {}         fn push_back_tracked_path_component(&mut self, _component: &BStr) {}         fn push_path_component(&mut self, _component: &BStr) {}         fn pop_path_component(&mut self) {}         fn visit_tree(&mut self, _entry: &EntryRef<'_>) -> Action {            self.num_trees += 1;            Action::Continue        }         fn visit_nontree(&mut self, entry: &EntryRef<'_>) -> Action {            use git::objs::tree::EntryMode::*;            match entry.mode {                Commit => self.num_submodules += 1,                Blob => {                    self.count_bytes(entry.oid);                    self.num_blobs += 1                }                BlobExecutable => {                    self.count_bytes(entry.oid);                    self.num_blobs_exec += 1                }                Link => self.num_links += 1,                Tree => unreachable!("BUG"),            }            Action::Continue        }    }}