Show files likes tree command

tree.php

    public function tree()
    {
        $nbFiles = iterator_count($this->getInnerIterator());
        if ($this->io && $nbFiles > 0) {
            $this->io->write('.');
            $currentDir = array();
            $depth = $countDir = 0;
            foreach ($this->getInnerIterator() as $key => $file) {
                $relativePath = $file->getRelativePath();
                if (empty($relativePath)) {
                    $depth = 0;
                    $currentDir = array();
                } else {
                    $listDir = explode(DIRECTORY_SEPARATOR, $relativePath);
                    if ($dirDiff =  array_diff_assoc($listDir, $currentDir)) {
                        $depth = count($listDir) - count($dirDiff);
                        foreach ($dirDiff as $dirName) {
                            $this->io->write(
                                sprintf(
                                    '%s├── <info>%s</info>',
                                    str_repeat(($depth > 0) ? '│   ': '    ', $depth),
                                    $dirName
                                )
                            );
                            $depth++;
                            $countDir++;
                        }
                    }
                    $currentDir = $listDir;
                }
                $this->io->write(
                    sprintf(
                        '%s├── %s',
                        str_repeat(($depth > 0) ? '│   ': '    ', $depth),
                        $file->getFileName()
                    )
                );
            }

            //Show total message
            $dir = '';
            if ($countDir > 0) {
                $dir = sprintf('%d %s, ', $countDir, ($countDir > 1) ? 'directories' : 'directory');
            }
            $file = sprintf('%d %s', $nbFiles, ($nbFiles > 1) ? 'files' : 'file');

            $this->io->write('');
            $this->io->write($dir.$file);
        }
    }