Function restore_index_from_head

atomic-cli/src/commands/git/shadow.rs:403–414

Discard a candidate staging by restoring the git index from HEAD's tree, leaving git byte-identical to its pre-operation state (the working copy is never touched). Best-effort.

(git_repo: &GitRepository)

/// leaving git byte-identical to its pre-operation state (the working copy is
/// never touched). Best-effort.
fn restore_index_from_head(git_repo: &GitRepository) {
    if let Ok(tree) = git_repo
        .head()
        .and_then(|h| h.peel_to_commit())
        .and_then(|c| c.tree())
    {
        if let Ok(mut index) = git_repo.index() {
            let _ = index.read_tree(&tree);
            let _ = index.write();
        }
    }
}

#[cfg(test)]
mod tests {