Airship\Cabin\Hull\Blueprint\Blog::getSnippet PHP Method

    public function getSnippet(array $post, bool $after = false) : array
    {
        // First, let's try cutting it off by section...
        if (empty($post['body'])) {
            return $post;
        }
        $i = 0;
        if ($post['format'] === 'Rich Text') {
            $post['body'] = \str_replace('><', '>' . "\n" . '<', $post['body']);
        }
        // Just in case:
        $post['body'] = \str_replace("\r\n", "\n", $post['body']);
        $lines = \explode("\n", $post['body']);
        // If we find <!--FOLD--> in the body, split on that instead:
        $search = \array_search($this->defaultSeparator, $lines);
        if ($search !== false) {
            $post['snippet'] = \implode("\n", \array_slice($lines, 0, $search - 1));
            if ($after) {
                $post['after_fold'] = \implode("\n", \array_slice($lines, $search));
            }
            return $post;
        }
        // Short post? Just dump it as-is:
        if (count($lines) < 4 || Binary::safeStrlen($post['body']) < 200) {
            $post['snippet'] = $post['body'];
            $post['after_fold'] = '';
            return $post;
        }
        $cutoff = null;
        $regex = '#^([' . \preg_quote('!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~', '#') . '])#';
        foreach ($lines as $i => $line) {
            if (empty($line)) {
                continue;
            }
            if ($post['format'] === 'RST') {
                if (\preg_match($regex, $line[0], $m)) {
                    if ($i > 2 && \trim($line) === \str_repeat($m[1], Binary::safeStrlen($line))) {
                        $cutoff = $i;
                        break;
                    }
                }
            } elseif ($post['format'] === 'Markdown') {
                if (\preg_match('#^([' . \preg_quote('#', '#') . ']{1,})#', $line[0], $m)) {
                    $cutoff = $i;
                    break;
                }
            } elseif ($post['format'] === 'HTML' || $post['format'] === 'Rich Text') {
                if (\preg_match('#^<' . 'h[1-7]>#', $line[0], $m)) {
                    $cutoff = $i;
                    break;
                }
            }
        }
        if ($cutoff !== null) {
            $post['snippet'] = \implode("\n", \array_slice($lines, 0, $i - 1));
            if ($after) {
                $post['after_fold'] = \implode("\n", \array_slice($lines, $i - 1));
            }
            return $post;
        }
        // Next, let's find the 37% mark for breaks
        $split = $post['format'] === 'Rich Text' || $post['format'] === 'HTML' ? "\n" : "\n\n";
        $sects = \explode($split, $post['body']);
        // 37% is approximately 1/e (the mathematical constant)
        $cut = (int) \ceil(0.37 * \count($sects));
        if ($sects < 2) {
            $post['snippet'] = $post['body'];
            $post['after_fold'] = '';
            return $post;
        }
        if (\preg_match('#^\\.\\. #', $sects[$cut - 1])) {
            --$cut;
        }
        $post['snippet'] = \implode("\n\n", \array_slice($sects, 0, $cut - 1)) . "\n";
        if ($after) {
            $post['after_fold'] = "\n" . \implode($split, \array_slice($sects, $cut - 1));
        }
        return $post;
    }

 /**
  * The homepage for an Airship.
  *
  * @route /
  */
 public function index()
 {
     $this->blog = $this->blueprint('Blog');
     if (!\file_exists(ROOT . '/public/robots.txt')) {
         // Default robots.txt
         \file_put_contents(ROOT . '/public/robots.txt', "User-agent: *\nAllow: /");
     }
     $blogRoll = $this->blog->recentFullPosts((int) ($this->config('homepage.blog-posts') ?? 5));
     $mathJAX = false;
     foreach ($blogRoll as $i => $blog) {
         $blogRoll[$i] = $this->blog->getSnippet($blog);
         if (Binary::safeStrlen($blogRoll[$i]['snippet']) !== Binary::safeStrlen($blog['body'])) {
             $blogRoll[$i]['snippet'] = \rtrim($blogRoll[$i]['snippet'], "\n");
         }
         $mathJAX |= \strpos($blog['body'], '$$') !== false;
     }
     $args = ['blogposts' => $blogRoll];
     $this->config('blog.cachelists') ? $this->stasis('index', $args) : $this->lens('index', $args);
 }