icingaweb2/modules/doc/library/Doc/MarkdownFileIterator.php

<?php
// {{{ICINGA_LICENSE_HEADER}}}
// {{{ICINGA_LICENSE_HEADER}}

namespace Icinga\Module\Doc;

use \RecursiveFilterIterator;

/**
 * Iterator over Markdown files recursively
 */
class MarkdownFileIterator extends RecursiveFilterIterator
{
    /**
     * Accept files with .md suffix
     *
     * @return bool Whether the current element of the iterator is acceptable
     *              through this filter
     */
    public function accept()
    {
        $current = $this->getInnerIterator()->current();
        if (!$current->isFile()) {
            return false;
        }
        $filename = $current->getFilename();
        $sfx = substr($filename, -3);
        return $sfx === false ? false : strtolower($sfx) === '.md';
    }
}