Add an admin notice if Shiny Code is installed from source and missin…

…g dependencies. See #5

CHANGELOG.md

@@ -2,7 +2,9 @@
 
 ## [Unreleased]
 
-## 1.0.0 - 2018-12-13
+* Added an admin notice if Shiny Code is missing dependencies. ([#5](https://github.com/cedaro/shiny-code/issues/5))
+
+## [1.0.0] - 2018-12-13
 
 * Fixed enqueuing of custom Prism.js language assets.
 * Fixed the handle for core block editor styles for WordPress 5.0.

php/functions.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Helper functions
+ *
+ * @package ShinyCode
+ * @since 1.0.1
+ * @copyright Copyright (c) 2018 Cedaro, LLC
+ * @license   GPL-2.0-or-later
+ */
+
+declare ( strict_types = 1 );
+
+namespace Cedaro\WP\BlockType\Code;
+
+/**
+ * Display a notice about missing dependencies.
+ *
+ * @since 1.0.1
+ */
+function display_missing_dependencies_notice() {
+	$message = sprintf(
+		/* translators: %s: documentation URL */
+		__( 'Shiny Code is missing required dependencies. <a href="%s" target="_blank" rel="noopener noreferer">Learn more.</a>', 'shiny-code' ),
+		'https://github.com/cedaro/shiny-code#installation'
+	);
+
+	printf(
+		'<div class="shiny-code-compatibility-notice notice notice-error"><p>%s</p></div>',
+		wp_kses(
+			$message,
+			[
+				'a' => [
+					'href'   => true,
+					'rel'    => true,
+					'target' => true,
+				],
+			]
+		)
+	);
+}

shiny-code.php

@@ -47,6 +47,13 @@
 	require __DIR__ . '/vendor/autoload.php';
 }
 
+// Display a notice and bail if dependencies are missing.
+if ( ! class_exists( __NAMESPACE__ . '\Plugin' ) ) {
+	require_once __DIR__ . '/php/functions.php';
+	add_action( 'admin_notices', __NAMESPACE__ . '\display_missing_dependencies_notice' );
+	return;
+}
+
 // Create the main plugin instance.
 $shiny_code = ( new Plugin() )
 	->set_basename( plugin_basename( __FILE__ ) )