Function commit_diff_files 

pub fn commit_diff_files(
    repo: &Repository,
    commit_oid: &ObjectId,
    merges: DiffMerges,
    detail: DiffDetail,
    options: &DiffOptions,
    pathspecs: &[String],
    config: &ConfigSet,
    thread_policy: &ThreadPolicy,
) -> Result<DiffFilesOutput>

Build per-file diffs for one commit, using combined merge diff when requested.

Errors

Propagates object read, tree walk, and diff errors.