Gush\Helper\GitHelper::getFirstCommitTitle PHP Method

    public function getFirstCommitTitle($base, $sourceBranch)
    {
        try {
            $forkPoint = $this->processHelper->runCommand(sprintf('git merge-base --fork-point %s %s', $base, $sourceBranch));
            $lines = $this->processHelper->runCommand(sprintf('git rev-list %s..%s --reverse --oneline', $forkPoint, $sourceBranch));
            return substr(strtok($lines, "\n"), 8);
        } catch (\RuntimeException $e) {
            return '';
        }
    }