/**
* Generate the usage for a shell based on its arguments and options.
* Usage strings favor short options over the long ones. and optional args will
* be indicated with []
*
* @return string
*/
protected function _generateUsage()
{
$usage = ['cake ' . $this->_parser->command()];
$subcommands = $this->_parser->subcommands();
if (!empty($subcommands)) {
$usage[] = '[subcommand]';
}
$options = [];
foreach ($this->_parser->options() as $option) {
$options[] = $option->usage();
}
if (count($options) > $this->_maxOptions) {
$options = ['[options]'];
}
$usage = array_merge($usage, $options);
$args = [];
foreach ($this->_parser->arguments() as $argument) {
$args[] = $argument->usage();
}
if (count($args) > $this->_maxArgs) {
$args = ['[arguments]'];
}
$usage = array_merge($usage, $args);
return implode(' ', $usage);
}
