printHelpMessage function
Print help message to the console.
Implementation
void printHelpMessage([final String? message]) {
if (message != null) {
stderr.writeln(red.wrap('$message\n'));
}
final String options =
LineSplitter.split(argumentParser.usage).map((String l) => l).join('\n');
stdout.writeln(
'Usage: dart_hooks --$_projectTypeArgument '
'[${supportedProjectType.join(', ')}] <local project directory>'
'\nOptions:\n$options',
);
}