From 628a39772933c58908f2ec68cc05b027e939b207 Mon Sep 17 00:00:00 2001
From: Mischa POSLAWSKY <perl@shiar.org>
Date: Mon, 11 Feb 2019 01:09:30 +0100
Subject: [PATCH] nieuws: first paragraph teaser as page description

Enable previews in social media links.  Also used in search results.
---
 head.inc.php     | 3 +++
 nieuws.inc.php   | 7 +++++++
 nieuws/index.php | 1 +
 3 files changed, 11 insertions(+)

diff --git a/head.inc.php b/head.inc.php
index ff63971..1e57e66 100644
--- a/head.inc.php
+++ b/head.inc.php
@@ -4,6 +4,9 @@
 	<meta charset="utf-8" />
 <?php if (!empty($Place['title'])) { ?>
 	<title><?= htmlspecialchars($Place['title']) ?></title>
+<?php } ?>
+<?php if (!empty($Place['description'])) { ?>
+	<meta name="description" property="og:description" content="<?= strip_tags($Place['description']) ?>" />
 <?php } ?>
 	<meta name="viewport" content="width=device-width" />
 	<!--[if lt IE 9]><script src="https://cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.3/html5shiv.min.js"></script><![endif]-->
diff --git a/nieuws.inc.php b/nieuws.inc.php
index 40313e4..6d84d1a 100644
--- a/nieuws.inc.php
+++ b/nieuws.inc.php
@@ -86,6 +86,13 @@ class ArchiveArticle
 		return $rest;
 	}
 
+	function teaser()
+	{
+		if (preg_match('{<p>(.*?)</p>}s', $this->body, $bodyp)) {
+			return $bodyp[1];
+		}
+	}
+
 	function img()
 	{
 		$this->body;
diff --git a/nieuws/index.php b/nieuws/index.php
index 4ffaa23..71048d5 100644
--- a/nieuws/index.php
+++ b/nieuws/index.php
@@ -12,6 +12,7 @@ if ($page and !is_numeric($page)) {
 	$edit = !empty($User['admin']) ? htmlspecialchars(@$_GET['edit']) : NULL;
 	$article = new ArchiveArticle("$Page$Args.html");
 	$Place['title'] = $edit ?: $article->title;
+	$Place['description'] = $article->teaser;
 	$Place[1] = ' <small class="date">'.$article->date.'</small>';
 	print preg_replace('{(?<=<h2>)(.*?)(?=</h2>)}', ($edit ?: '\1').' [[1]]', ob_get_clean());
 	if ($article->file and $article->image) {
-- 
2.30.0