src/DrushStack.php
public function drush($command, $assumeYes = true)
    {
        if (is_array($command)) {
            $command = implode(' ', array_filter($command));
        }

        return $this->exec($this->injectArguments($command, $assumeYes));
    }
public function drush($command, $assumeYes = true)
    {
        if (is_array($command)) {
            $command = implode(' ', array_filter($command));
        }

        return $this->exec($this->injectArguments($command, $assumeYes));
    }
Runs the given drush command.

@param string $command
@param bool $assumeYes

@return $this