use anyhow::bail;use gix::bstr::{BString, ByteSlice}; pub fn log(mut repo: gix::Repository, out: &mut dyn std::io::Write, path: Option<BString>) -> anyhow::Result<()> {    repo.object_cache_size_if_unset(repo.compute_object_cache_size_for_tree_diffs(&**repo.index_or_empty()?));     if let Some(path) = path {        log_file(repo, out, path)    } else {        log_all(repo, out)    }} fn log_all(repo: gix::Repository, out: &mut dyn std::io::Write) -> Result<(), anyhow::Error> {    let head = repo.head()?.peel_to_commit()?;    let topo = gix::traverse::commit::topo::Builder::from_iters(&repo.objects, [head.id], None::<Vec<gix::ObjectId>>)        .build()?;     for info in topo {        let info = info?;         write_info(&repo, &mut *out, &info)?;    }     Ok(())} fn log_file(_repo: gix::Repository, _out: &mut dyn std::io::Write, _path: BString) -> anyhow::Result<()> {    bail!("File-based lookup isn't yet implemented in a way that is competitively fast");} fn write_info(    repo: &gix::Repository,    mut out: impl std::io::Write,    info: &gix::traverse::commit::Info,) -> Result<(), std::io::Error> {    let commit = repo.find_commit(info.id).unwrap();     let message = commit.message_raw_sloppy();    let title = message.lines().next();     writeln!(        out,        "{} {}",        info.id.to_hex_with_len(8),        title.map_or_else(|| "<no message>".into(), BString::from)    )?;     Ok(())}