Prepare support for per-page override.

user/plugins/markdown-underline/markdown-underline.php

@@ -6,12 +6,20 @@ use Grav\Common\Plugin;
 use RocketTheme\Toolbox\Event\Event;
 
 /**
+ * Customize the HTML tags to use with the usual inline emphasis and strong blocks.
+ *
+ * - *
+ * - **
+ * - _
+ * - __
+ *
+ *
  * __some text__ => <u>some text</u>
  *
  * Use with caution, as underlining makes text harder to read.
  * If you don't think so, please be thankful for your great sight and ortholexia.
  *
- * Not sure how this will fare with multibyte strings. Probably badly.
+ * Not sure how this will fare with multibyte strings. Possibly badly.
  * Try mb_strlen ?
  *
  * Class MarkdownUnderlinePlugin
@@ -41,13 +49,14 @@ class MarkdownUnderlinePlugin extends Plugin
      */
     public function onPluginsInitialized()
     {
-        // Don't proceed if we are in the admin plugin
-        // This check is legacy, and is perhaps not useful?
+        // Don't proceed if we are in the admin plugin.
+        // Since we don't sanitize the configuration options, this is paramount.
+        // This way, if the plugin breaks pages somehow, admin will still be available.
         if ($this->isAdmin()) {
             return;
         }
 
-        // Enable the main event we are interested in
+        // *Subscribe* to the main event we are interested in.
         $this->enable([
             'onMarkdownInitialized' => ['onMarkdownInitialized', 0],
         ]);
@@ -56,8 +65,21 @@ class MarkdownUnderlinePlugin extends Plugin
     public function onMarkdownInitialized(Event $event)
     {
         $markdown = $event['markdown'];
-
-        $mu_config = $this->config->get('plugins.markdown-underline');
+        $config = $this->config;
+        $mu_config = $config->get('plugins.markdown-underline');
+
+        // This feature depends on the page being provided in onMarkdownInitialized event.
+        // There may be a PR for this in the future. Not sure about the implications.
+        if (isset($event['page'])) {
+            $config = $this->mergeConfig($event['page']);
+            // Merging works but changes paths
+            $mu_config = array(
+                '*' => $config->get('*'),
+                '**' => $config->get('**'),
+                '_' => $config->get('_'),
+                '__' => $config->get('__'),
+            );
+        }
 
         // Add our parser right before the Emphasis one.
         // See vendor/erusev/parsedown/Parsedown.php#L977