Function validation

lib/validation.ts:17–474

(
  yargs: YargsInstance,
  usage: UsageInstance,
  shim: PlatformShim
)

// validation-type-stuff, missing params,
// bad implications:
export function validation(
  yargs: YargsInstance,
  usage: UsageInstance,
  shim: PlatformShim
) {
  const __ = shim.y18n.__;
  const __n = shim.y18n.__n;
  const self = {} as ValidationInstance;

  // validate appropriate # of non-option
  // arguments were provided, i.e., '_'.
  self.nonOptionCount = function nonOptionCount(argv) {
    const demandedCommands = yargs.getDemandedCommands();
    // don't count currently executing commands
    const positionalCount =
      argv._.length + (argv['--'] ? argv['--'].length : 0);
    const _s =
      positionalCount - yargs.getInternalMethods().getContext().commands.length;

    if (
      demandedCommands._ &&
      (_s < demandedCommands._.min || _s > demandedCommands._.max)
    ) {
      if (_s < demandedCommands._.min) {
        if (demandedCommands._.minMsg !== undefined) {
          usage.fail(
            // replace $0 with observed, $1 with expected.
            demandedCommands._.minMsg
              ? demandedCommands._.minMsg
                  .replace(/\$0/g, _s.toString())
                  .replace(/\$1/, demandedCommands._.min.toString())
              : null
          );
        } else {
          usage.fail(
            __n(
              'Not enough non-option arguments: got %s, need at least %s',
              'Not enough non-option arguments: got %s, need at least %s',
              _s,
              _s.toString(),
              demandedCommands._.min.toString()
            )
          );
        }
      } else if (_s > demandedCommands._.max) {
        if (demandedCommands._.maxMsg !== undefined) {
          usage.fail(
            // replace $0 with observed, $1 with expected.
            demandedCommands._.maxMsg
              ? demandedCommands._.maxMsg
                  .replace(/\$0/g, _s.toString())
                  .replace(/\$1/, demandedCommands._.max.toString())
              : null
          );
        } else {
          usage.fail(
            __n(
              'Too many non-option arguments: got %s, maximum of %s',