pub fn parse_pair_args(rest: &[String]) -> Result<PairArgs, ToolError>
pair [directory] [--model m] [--title t] [--controller c] [--no-tab] [--dry-run] [-- <controller args>].
pair [directory] [--model m] [--title t] [--controller c] [--no-tab] [--dry-run] [-- <controller args>]