makeHelp function Null safety

String makeHelp()

Return a string that contains the usage and help information based on the arguments defined and the available builders.


String makeHelp() {
  final usage = argParser.usage;
  return '''Usage: dcdg [options]


Available builders:
  * ${availableBuilders().join('\n  * ')}

The --$includeOption, --$excludeOption, --$hasAOption, and --$isAOption
options accept regular expressions. These options accept multiple values,
separated by commas, or they can be passed multiple times.

Note: If both $excludeOption and $includeOption are supplied, types that
are in both lists will be removed from the includes list and then the
includes list will be applied as usual.''';