From c7f5b415c17b1ecbf1244f13c97cb89e74bec7c4 Mon Sep 17 00:00:00 2001
From: Mischa POSLAWSKY <perl@shiar.org>
Date: Thu, 17 Oct 2019 02:59:47 +0200
Subject: [PATCH] sitemap.xml: calculate priority from path names

---
 sitemap.xml/index.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sitemap.xml/index.php b/sitemap.xml/index.php
index 7d28815..f0f928b 100644
--- a/sitemap.xml/index.php
+++ b/sitemap.xml/index.php
@@ -12,6 +12,14 @@ foreach ($search->files() as $link) {
 	$article = new ArchiveArticle($link);
 	print '<url>';
 	print "<loc>$siteref/{$article->link}</loc>";
+	$score = 10;
+	if ($article->link) {
+		$score -= substr_count($article->link, '/') + 1;  # -10% per subdir
+		$age = time() - strtotime($article->dateiso);
+		$age /= 3600 * 24 * 365;  # years
+		if ($age > .1) $score -= $age / 10 + .1;  # -1% per year
+	}
+	printf('<priority>%.2f</priority>', $score / 10);
 	if ($article->last) {
 		print "<lastmod>{$article->lastiso}</lastmod>";
 	}
-- 
2.30.0