use anyhow::bail; use crate::OutputFormat; pub fn merge_base(    mut repo: gix::Repository,    first: String,    others: Vec<String>,    mut out: impl std::io::Write,    format: OutputFormat,) -> anyhow::Result<()> {    if format != OutputFormat::Human {        bail!("Only 'human' format is currently supported");    }    repo.object_cache_size_if_unset(50 * 1024 * 1024);    let first_id = repo.rev_parse_single(first.as_str())?;    let other_ids: Vec<_> = others        .iter()        .map(|other| repo.rev_parse_single(other.as_str()).map(gix::Id::detach))        .collect::<Result<_, _>>()?;     let cache = repo.commit_graph_if_enabled()?;    let mut graph = repo.revision_graph(cache.as_ref());    let bases = repo.merge_bases_many_with_graph(first_id, &other_ids, &mut graph)?;    if bases.is_empty() {        bail!("No base found for {first} and {others}", others = others.join(", "))    }    for id in bases {        writeln!(&mut out, "{id}")?;    }    Ok(())}