Adding a public-facing page with a shortcode

includes/class-app.php

@@ -147,7 +147,9 @@ class App {
         //
 
         // Files to include that may be sub-namespaced.
-        //
+        if ( is_single() ) {
+            require_once __DIR__ . '/front/class-custompage.php';
+        }
     }
 
     /**

includes/front/class-custompage.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace PluginNamespace\Front;
+
+class CustomPage {
+    
+    public function __construct() {
+        add_shortcode( 'nmsp_plugin_shortcode', array( $this, 'display_custom_page' ) );
+    }
+
+    /**
+     * Display a page in place of a shortcode.
+     *
+     * @since 1.0.0
+     *
+     * @param array  $attributes  Array of attributes on the shortcode string in the post body.
+     * @param string $content     (optional) Text content that is between opening and closing shortcodes. 
+     *
+     * @return string
+     */
+    public function display_custom_page( array $attributes = array(), $content = null ) {
+        $data = array(
+            'shortcode' => array(
+                'attributes' => $attributes,
+                'content'    => $content,
+            ),
+        );
+
+        // phpcs:disable WordPress.Security.EscapeOutput
+        return nmsp_plugin_app()->blade->run( 'front.custom-page', $data );
+        // phpcs:enable WordPress.Security.EscapeOutput
+    }
+
+}
+
+new CustomPage();