pico_ynh/sources/plugins/Clutter/Clutter.php

<?php

class Clutter extends AbstractPicoPlugin {
    protected $enabled = true;

    const API_VERSION = 2;

    public function root($string) {
        preg_match('/^([^\/]+\/)+/', $string, $matches);
        if (count($matches))
            return $matches[0];
        else
            return '';
    }

    public function level($string) {
        $pieces = explode('/', '/' . $string);

        if ($pieces[count($pieces) - 1] == 'index') {
            return count($pieces) - 1;
        }
        return count($pieces);
    }

    public function isIndex($string) {
        $pieces = explode('/', $string);
        return ($pieces[count($pieces) - 1] == 'index');

    }

    public function directoryChain($string) {
        $baseUrl = $this->getPico()->getBaseUrl();
        $pieces = explode('/', '/' . $string);

        $returnStringParts = [];
        $aggregate = '';

        $arr2s = '';

        for ($i = 1; $i < count($pieces); $i++) {
            $arr2s = $arr2s . ',' . $pieces[$i];
            $aggregate = $aggregate . $pieces[$i] . '/';

            $anchor = sprintf('<a href="%s?%s">%s</a>', $baseUrl, $aggregate, $pieces[$i]);
            //$returnString = $returnString . $anchor . '/';
            $returnStringParts[] = $anchor;
        }
        return implode('/', $returnStringParts);
    }

    //public function onPageRendering(&$templateName, array &$twigVariables) {
    public function onPagesDiscovered(&$pages) {
        $twig = $this->getPico()->getTwig();

        $twig->addFilter(new Twig_SimpleFilter('directoryChain', array($this, 'directoryChain')));
        $twig->addFilter(new Twig_SimpleFilter('root', array($this, 'root')));
        $twig->addFilter(new Twig_SimpleFilter('level', array($this, 'level')));
        $twig->addFilter(new Twig_SimpleFilter('isIndex', array($this, 'isIndex')));
    }

}