From bcd078bf0a5119fe0c8441b803b4fe05fdaa6d18 Mon Sep 17 00:00:00 2001
From: ArthurHoaro <arthur@hoa.ro>
Date: Sat, 12 Mar 2016 14:39:06 +0100
Subject: [PATCH] Plugin: add render_feed hook and call it while generating
 ATOM and RSS feed.

Create an example of the new hook in the demo plugin.
---
 index.php                           |  6 ++++++
 plugins/demo_plugin/demo_plugin.php | 27 ++++++++++++++++++++++++++-
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/index.php b/index.php
index 261c8a3..73b8353 100644
--- a/index.php
+++ b/index.php
@@ -785,6 +785,12 @@ function showRSS($pageBuilder, $linkDB)
     $data['usepermalinks'] = $usepermalinks;
     $data['links'] = $linkDisp;
 
+    $pluginManager = PluginManager::getInstance();
+    $pluginManager->executeHooks('render_feed', $data, array(
+        'loggedin' => isLoggedIn(),
+        'target' => Router::$PAGE_RSS,
+    ));
+
     $pageBuilder->assignAll($data);
     $pageBuilder->renderPage('feed.rss', false);
     $cache->cache(ob_get_contents());
diff --git a/plugins/demo_plugin/demo_plugin.php b/plugins/demo_plugin/demo_plugin.php
index f5f028e..18834e5 100644
--- a/plugins/demo_plugin/demo_plugin.php
+++ b/plugins/demo_plugin/demo_plugin.php
@@ -322,4 +322,29 @@ function hook_demo_plugin_delete_link($data)
     if (strpos($data['url'], 'youtube.com') !== false) {
         exit('You can not delete a YouTube link. Don\'t ask.');
     }
-}
\ No newline at end of file
+}
+
+/**
+ * Execute render_feed hook.
+ * Called with ATOM and RSS feed.
+ *
+ * Special data keys:
+ *   - _PAGE_: current page
+ *   - _LOGGEDIN_: true/false
+ *
+ * @param array $data data passed to plugin
+ *
+ * @return array altered $data.
+ */
+function hook_demo_plugin_render_feed($data)
+{
+    foreach ($data['links'] as &$link) {
+        if ($data['_PAGE_'] == Router::$PAGE_FEED_ATOM) {
+            $link['description'] .= ' - ATOM Feed' ;
+        }
+        elseif ($data['_PAGE_'] == Router::$PAGE_FEED_RSS) {
+            $link['description'] .= ' - RSS Feed';
+        }
+    }
+    return $data;
+}