From f1496b06538f785b0200e867885a8a08c17b8b35 Mon Sep 17 00:00:00 2001
From: Jannik Beyerstedt <code@jannikbeyerstedt.de>
Date: Sun, 31 Jan 2021 00:25:42 +0100
Subject: [PATCH] Add RSS feed to blog

---
 site/snippets/blog-htmlhead.php |  2 ++
 site/snippets/blogfeed.php      | 33 +++++++++++++++++++++++++++++++++
 site/templates/blog.php         |  8 ++++++++
 3 files changed, 43 insertions(+)
 create mode 100644 site/snippets/blogfeed.php

diff --git a/site/snippets/blog-htmlhead.php b/site/snippets/blog-htmlhead.php
index a6aa516..b6f5e27 100644
--- a/site/snippets/blog-htmlhead.php
+++ b/site/snippets/blog-htmlhead.php
@@ -26,6 +26,8 @@ if( $page->isHomePage() ) {
   <meta name="robots" content="<?php echo $page->meta_robots()->html() ?>">
 <?php endif; ?>
 
+  <link rel="alternate" type="application/rss+xml" title="Janniks Blog" href="<?= site()->url() ?>?rss"/>
+
   <?php echo css('assets/css/foundation.css?v1.1') ?>
 
   <?php echo css('assets/css/main.css?v1.1') ?>
diff --git a/site/snippets/blogfeed.php b/site/snippets/blogfeed.php
new file mode 100644
index 0000000..b476599
--- /dev/null
+++ b/site/snippets/blogfeed.php
@@ -0,0 +1,33 @@
+<?php
+// -------------------------------------------
+// kirby snipper FOR generic
+
+// copyright: Jannik Beyerstedt | https://jannikbeyerstedt.de
+// license: http://www.gnu.org/licenses/gpl-3.0.txt GPLv3 License
+
+// Usage: snippet('blogfeed',["articles"=>$articles, "link"=>$baseurl, "feedurl"=>$feedurl])
+// -------------------------------------------
+
+header("Content-Type: application/rss+xml");
+?>
+<?xml version="1.0" encoding="UTF-8" ?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
+<channel>
+  <title>Janniks Blog</title>
+  <description>Persönliches Blog von Jannik Beyerstedt</description>
+  <link><?php echo $link ?></link>
+  <atom:link href="<?= \Kirby\Toolkit\Xml::encode($feedurl) ?>" rel="self" type="application/rss+xml" />
+  <pubDate><?php echo date("d M Y H:i:s O") ?></pubDate>
+
+<?php foreach($articles as $a):?>
+  <item>
+    <title><?php echo \Kirby\Toolkit\Xml::encode($a->title()) ?></title>
+    <link><?php echo \Kirby\Toolkit\Xml::encode($a->url()) ?></link>
+    <guid isPermaLink="false">jbeyerstedt/<?php echo \Kirby\Toolkit\Xml::encode($a->slug()) ?></guid>
+    <pubDate><?php echo $a->date()->toDate("d M Y H:i:s O") ?></pubDate>
+    <description><![CDATA[<?php echo $a->text()->kirbytext() ?>]]></description>
+  </item>
+
+<?php endforeach; ?>
+</channel>
+</rss>
diff --git a/site/templates/blog.php b/site/templates/blog.php
index 1646d9f..8a4ba2f 100644
--- a/site/templates/blog.php
+++ b/site/templates/blog.php
@@ -25,9 +25,17 @@ function tags_html($base_url, $article) {
 
 
 $base_url   = $site->find('blog')->url();
+$feed_url   = $base_url.'?rss';
 $articles   = $page->children()->listed()->flip();
 $title      = $page->title()->html();
 
+// Deliver RSS feed on ?rss GET parameter
+$is_rss = get('rss');
+if ($is_rss !== null) {
+  snippet('blogfeed', ["articles"=>$articles,"link"=>$base_url,"feedurl"=>$feed_url]);
+  exit;
+}
+
 // Filter by requested tag
 if($tag = param('tag')) {
   $articles = $articles->filterBy('tags', $tag, ',');