Settings link in Plugins overview and Manage blocks (#412)

* offering Settings link in Plugins overview and Manage blocks

* fix code checker

* adjust comments

lang/en/block_opencast.php

@@ -770,6 +770,8 @@
 $string['setdefaultseriessucceeded'] = 'The default series has been successfully changed.';
 $string['setting_permanent'] = 'Is permanent';
 $string['settings'] = 'Opencast Videos';
+$string['settings_page'] = 'Settings';
+$string['settings_page_url'] = '{$a} Settings';
 $string['shared_settings'] = 'Shared settings';
 $string['showvideos'] = 'Show videos';
 $string['source'] = 'Source';

settings.php

@@ -1143,3 +1143,16 @@
     }
 }
 $settings = null;
+
+// In order to be able to offer "Settings" links in Plugins overview and Manage blocks,
+// we need to use a specific setting category (admin_category) that has to be "blocksettingopencast",
+// therefore we provide it as a hidden subcategory to block_opencast to minimize the changes.
+$blocksettingscategory = new admin_category('blocksettingopencast', new lang_string('settings_page', 'block_opencast'), true);
+$mainsettingurl = new moodle_url('/admin/category.php', ['category' => 'block_opencast']);
+$settingexternalpage = new admin_externalpage(
+    'blocksettingopencast_externalpage',
+    get_string('settings_page_url', 'block_opencast', get_string('settings', 'block_opencast')),
+    $mainsettingurl
+);
+$blocksettingscategory->add('blocksettingopencast', $settingexternalpage);
+$ADMIN->add('block_opencast', $blocksettingscategory);