Gush\Helper\GitHelper::getIssueNumber PHP Method

    public function getIssueNumber()
    {
        $segments = explode('-', $this->getActiveBranchName(), 2);
        if (!isset($segments[1])) {
            throw new UserException(['Unable to extract issue-number from the current branch name.', 'Please provide an issue number with the command.']);
        }
        return $segments[0];
    }