Switch to new dated email format

site/plugins/qdated.php

@@ -1,42 +1,59 @@
 <?php
 
 /**
- * Returns the current qdated address
- * If qdated is not available, returns null
+ * Returns the current dated address
  *
  * @return string
  */
-function qdated() {
-	$path = $_SERVER['HOME'] . '/.config/qdated/cddmail2/current';
-	if(!is_file($path)) return null;
-	
-	return 'dated-' . trim(f::read($path)) . '@' . url::host();
+function dated(): string {
+    // date in seven days
+    $date = modifiedJulianDate(time() + 7 * 24 * 60 * 60);
+
+    return 'dated-' . $date . '@' . url::host();
 }
 
 /**
- * Returns an HTML a mailto tag with the current qdated address
- * If qdated is not available, returns an HTML error message
+ * Returns an HTML a mailto tag with the current dated address
+ * If dated is not available, returns an HTML error message
  *
  * @param  mixed  $text Optional text for the link
  *                      Can also be true to use the email
  *                      address but put a line break in it
  * @return string       HTML code
  */
-function qdatedHtml($text = false) {
-	$email = qdated();
-	if(!$email) return '<p><strong>' . l::get('qdated.error') . '</strong></p>';
+function datedHtml($text = false) {
+	$email = dated();
 	
 	if($text === true) $text = str_replace('@', '<br>@', $email);
 	return str::email($email, $text);
 }
 
 /**
- * qdated Kirbytag
- * 
- * Usage: (qdated: Optional link text)
+ * Returns the Modified Julian Date,
+ * which is the Julian Date with the first two digits stripped
+ * and with an offset of one day to compensate for the Julian Date
+ * starting at noon instead of at midnight
+ *
+ * @param int $timestamp Timestamp to calculate from, defaults to the current date
+ * @return int
  */
-kirby()->set('tag', 'qdated', [
+function modifiedJulianDate(?int $timestamp = null): int {
+    $timestamp = $timestamp ?? time();
+
+    return gregoriantojd(
+        date('m', $timestamp),
+        date('d', $timestamp),
+        date('Y', $timestamp)
+    ) - 2400001;
+}
+
+/**
+ * dated Kirbytag
+ * 
+ * Usage: (dated: Optional link text)
+ */
+kirby()->set('tag', 'dated', [
 	'html' => function($tag) {
-		return qdatedHtml($tag->attr('qdated'));
+		return datedHtml($tag->attr('dated'));
 	}
 ]);