feat: add warning that ALFRED needs frontend module

RockFrontend.module.php

@@ -73,6 +73,8 @@ class RockFrontend extends WireData implements Module, ConfigurableModule
   const field_images = self::prefix . "images";
   const field_less = self::prefix . "less";
 
+  private $addMarkup;
+
   /** @var WireData */
   public $alfredCache;
 
@@ -234,6 +236,7 @@ public function init()
     wire()->addHookMethod("Page::otherLangUrl",          $this, "otherLangUrl");
     wire()->addHookAfter("Modules::refresh",             $this, "livereloadResetCache");
     wire()->addHookAfter("Page::render",                 $this, "livereloadAddMarkup");
+    wire()->addHookAfter("Page::render",                 $this, "hookAddMarkup");
 
     // others
     $this->ajaxAddEndpoints();
@@ -559,6 +562,11 @@ public function alfred($page = null, $options = [])
   {
     if (!$this->alfredAllowed()) return;
 
+    // check if frontend editing is installed
+    if (!$this->wire->modules->isInstalled("PageFrontEdit")) {
+      $this->addMarkup .= "<script>alert('Please install PageFrontEdit to use ALFRED')</script>";
+    }
+
     // support short syntax
     if ($options === false) {
       $options = [
@@ -1271,6 +1279,21 @@ public function hideLayoutField(HookEvent $event)
     $form->remove(self::field_layout);
   }
 
+  /**
+   * Inject markup to the page body
+   * @param HookEvent $event
+   * @return void
+   */
+  protected function hookAddMarkup(HookEvent $event)
+  {
+    if (!$this->addMarkup) return;
+    $event->return = str_replace(
+      "</body>",
+      $this->addMarkup . "</body>",
+      $event->return
+    );
+  }
+
   /**
    * Return a latte HTML object that doesn't need to be |noescaped
    * @return Html

docs/alfred/readme.md

@@ -9,6 +9,8 @@ It has two main goals:
 
 See the video here: https://www.youtube.com/watch?v=7CoIj--u4ps&t=1714s
 
+<div class='uk-alert uk-alert-warning'>Note: To use ALFRED you need to install the PageFrontEdit module and make sure all users have the page-edit-front permission.</div>
+
 ## Easier Frontend Editing for Your Clients
 
 A typical example that almost every website has are footer links - that's why RockFrontend comes with a migration that creates a footerlinks field for you. It creates that field on the `home` page and the client can manage the footerlinks by editing the `home` page in the PW backend.