public function getArgumentsListing()
{
$r = "\n";
foreach ($this->_args as $letter => $arg) {
/* @var Arg $arg */
$desc = $arg->getDescription();
$flag = " -{$letter} ";
if ($arg->mayHaveValue) {
$flag .= "[VAL]";
} elseif ($arg->mustHaveValue) {
$flag .= "VAL";
}
if ($arg->assertFile) {
$flag = str_replace('VAL', 'FILE', $flag);
} elseif ($arg->assertDir) {
$flag = str_replace('VAL', 'DIR', $flag);
}
if ($arg->isRequired()) {
$desc = "(required) {$desc}";
}
$flag = str_pad($flag, 12, " ", STR_PAD_RIGHT);
$desc = wordwrap($desc, 70);
$r .= $flag . str_replace("\n", "\n ", $desc) . "\n\n";
}
return $r;
}