Fix namespace detection for pages in root

README.md

@@ -20,3 +20,11 @@ Download the latest release from [Tags] page and install the plugin using the
 1. Create an Incoming Webhook on slack: https://api.slack.com/messaging/webhooks#create_a_webhook
 
 2. Enter the webhook into the slacknotifier configuration section in DokuWiki's Configuration Settings
+
+## Root Namespace
+
+To incldue the root namespace, simply put a : in the namespace field in the config.
+
+## Discord
+
+This plugin will work for discord as well, if you append /slack to the discord webhook url; see https://birdie0.github.io/discord-webhooks-guide/other/slack_formatting.html 

event/PageSaveEvent.php

@@ -31,9 +31,16 @@ public function getEventType(): ?string
 
     /**
      * Root namespace of the page.
+     * Handle case of page being in root namespace
      */
     public function getNamespace(): string
     {
+        $pos = strpos($this->id, ':');
+        if($pos === false)
+        {
+            return ('');
+        }
+
         return explode(':', $this->id, 2)[0];
     }
 

helper/Config.php

@@ -40,7 +40,10 @@ public function isValidNamespace(string $namespace): bool
         }
 
         $namespaces = explode(',', $this->namespaces);
-
+        // Handle root namespace
+        if ($namespace === '') {
+            return in_array(':', $namespaces, true);
+        }
         return in_array($namespace, $namespaces, true);
     }
 }