<?php
// read vor.txt and generate vor.md, inserting dates if missing
date_default_timezone_set("CET");
$lo = array_filter(ResourceBundle::getLocales(''), function ($l) {return strpos(strtolower($l), 'de');});
setlocale(LC_TIME, 'de_DE');
$file_txt = 'vor.txt';
$file_md = 'vor.md';
$fil = file($file_txt, FILE_IGNORE_NEW_LINES);
// Copy header
$arr = ['| | |  |', '|:------|:------|:------|'];
$ts=(new DateTime('first day of this month'))->getTimeStamp();
foreach ($fil as $line) {
    $fields = array_filter(explode('|', $line));
    if (count($fields) == 2) {
        // Date missing, insert
        $tuesday = strftime('%A, %d.%m.%Y ', strtotime('fourth tuesday of this month', $ts));
        array_unshift($fields, $tuesday);
    }
    $ts=strtotime('+1 month', $ts);
    $li = implode('|', $fields);
    if ($li[0] != ' ') {
        $li = ' ' . $li;
    }
    if (substr($li, -1) != ' ') {
        $li = $li . ' ';
    }
    array_push($arr, '|' . $li . '|');
}
file_put_contents($file_md, implode(PHP_EOL, $arr) . PHP_EOL);
?>