Pantheon\Terminus\Models\Environment::countDeployableCommits PHP Method

    public function countDeployableCommits()
    {
        $parent_environment = $this->getParentEnvironment();
        $parent_commits = $parent_environment->getCommits()->all();
        $number_of_commits = 0;
        foreach ($parent_commits as $commit) {
            $labels = $commit->get('labels');
            $number_of_commits += (int) (!in_array($this->id, $labels) && in_array($parent_environment->id, $labels));
        }
        return $number_of_commits;
    }