First commit

developer/user/plugins/error/error.php

@@ -0,0 +1,68 @@
+<?php
+namespace Grav\Plugin;
+
+use Grav\Common\Plugin;
+use Grav\Common\Grav;
+use Grav\Common\Page\Page;
+use Grav\Common\Page\Pages;
+use Grav\Common\Page\Types;
+use RocketTheme\Toolbox\Event\Event;
+
+class ErrorPlugin extends Plugin
+{
+    /**
+     * @return array
+     */
+    public static function getSubscribedEvents()
+    {
+        return [
+            'onPageNotFound' => ['onPageNotFound', 0],
+            'onGetPageTemplates' => ['onGetPageTemplates', 0],
+        ];
+    }
+
+    /**
+     * Display error page if no page was found for the current route.
+     *
+     * @param Event $event
+     */
+    public function onPageNotFound(Event $event)
+    {
+        $this->enable([
+            'onTwigTemplatePaths' => ['onTwigTemplatePaths', -10]
+        ]);
+
+        /** @var Pages $pages */
+        $pages = $this->grav['pages'];
+
+        // Try to load user error page.
+        $page = $pages->dispatch($this->config->get('plugins.error.routes.404', '/error'), true);
+
+        if (!$page) {
+            // If none provided use built in error page.
+            $page = new Page;
+            $page->init(new \SplFileInfo(__DIR__ . '/pages/error.md'));
+        }
+
+        $event->page = $page;
+        $event->stopPropagation();
+    }
+
+    /**
+     * Add page template types.
+     */
+    public function onGetPageTemplates(Event $event)
+    {
+        /** @var Types $types */
+        $types = $event->types;
+        $types->register('error');
+    }
+
+    /**
+     * Add current directory to twig lookup paths.
+     */
+    public function onTwigTemplatePaths()
+    {
+        $this->grav['twig']->twig_paths[] = __DIR__ . '/templates';
+    }
+}