Prevent RuntimeException on external templates (Fix #12)

blueprints/external.yaml

@@ -31,7 +31,7 @@ form:
             header.external_url:
                 type: text
                 label: PLUGIN_ADMIN.EXTERNAL_URL
-                placeholder: http://haywire.me/
+                placeholder: https://github.com/robbinfellow/haywire-grav
                 validate:
                     required: true
 

haywire.php

@@ -20,7 +20,8 @@ public function onThemeInitialized()
         }
 
         $this->enable([
-            'onTwigSiteVariables' => ['onTwigSiteVariables', 0]
+            'onTwigSiteVariables' => ['onTwigSiteVariables', 0],
+            'onPageInitialized' => ['onPageInitialized', 0]
         ]);
     }
 
@@ -35,4 +36,14 @@ public function onTwigSiteVariables()
             $this->grav['assets']->addCss($path . $assets['/css/app.css']);
         }
     }
+
+    public function onPageInitialized()
+    {
+        // Redirect to external_url if external page template
+        $template = $this->grav['page']->template();
+        if ($template === 'external' && isset($this->grav['page']->header()->external_url)) {
+            $url = $this->grav['page']->header()->external_url;
+            $this->grav->redirect($url);
+        }
+    }
 }

templates/external.html.twig

@@ -0,0 +1,20 @@
+{#
+# (RuntimeException (400) Template "external.html.twig" is not defined.)
+# https://github.com/robbinfellow/haywire-grav/issues/12
+# Prevent grav from throwing RuntimeException when trying to visit a page using the external template.
+#}
+
+{% extends 'partials/base.html.twig' %}
+
+{% block content %}
+<div class="container">
+    <div class="notification is-danger">
+        <strong>
+            {{ 'ERROR'|t }}
+        </strong>
+        <p>
+            This page is not available.
+        </p>
+    </div>
+</div>
+{% endblock %}