feat: review the lessons order

user/plugins/m3-p2/m3-p2.php

@@ -10,8 +10,12 @@ use Symfony\Component\EventDispatcher\Event;
 /**
  * Features:
  * - /sync   Cheap git-sync (did not knew about it at the time)
+ * - /polyglot/<page-path>
  * - /lessons/<lesson-slug>
  *
+ * The way GRAV works to define new routes is to listen to the onPageNotFound event.
+ * This is expected to evolve as GRAV integrates more and more with Symfony components.
+ *
  * Class M3P2Plugin
  * @package Grav\Plugin
  */
@@ -218,7 +222,7 @@ class M3P2Plugin extends Plugin
         $uri = $this->grav['uri'];
 //        var_dump($uri); // best doc ftw
 
-        if ("lesson" != $uri->paths(0)) {
+        if ("lessons" != $uri->paths(0)) {
             return; // perhaps not
         }
 
@@ -260,19 +264,19 @@ class M3P2Plugin extends Plugin
             $ha = $a->header();
             $hb = $b->header();
 
-            $fdp = function ($pp) use ($lesson_slug) {
-                return $pp["slug"] == $lesson_slug;
+            $fdp = function ($lesson) use ($lesson_slug) {
+                return $lesson["slug"] == $lesson_slug;
             };
 
             // We're assuming the config exists (it should)
             $ma = array_filter($ha->lessons, $fdp)[0];
             $mb = array_filter($hb->lessons, $fdp)[0];
 
-            if (isset($ma['level'])) {
-                $la = floor($ma['level']);
+            if (isset($ma['order'])) {
+                $la = floor($ma['order']);
             }
-            if (isset($mb['level'])) {
-                $lb = floor($mb['level']);
+            if (isset($mb['order'])) {
+                $lb = floor($mb['order']);
             }
 
             return $la - $lb;