Function one_off 

pub fn one_off(
    op: Op,
    input: Value,
    cwd: &Path,
    project: &Result<Project, (Code, String)>,
    game: Option<&dyn GameTools>,
) -> Value

The answer of the operation op (one of Op::ALL) to input, as JSON: with the game’s tools game on project where it runs the game; new makes its folder from cwd, and import reads from the project’s root, or cwd outside one. Without the game’s tools or a project, an operation that needs them says so, as the CLI does.