Add a notice about installing themes or plugins

Author: mitchmac

wp/wp-content/mu-plugins/serverlesswp.php

@@ -5,7 +5,45 @@
 Plugin URI: https://github.com/mitchmac/serverlesswp
 Description: Plugin that makes sure your site runs smoothly on Vercel or Netlify.
 Author: Mitch MacKenzie
-Version: 1.0.0
+Version: 1.0.1
 */
 
-add_filter( 'got_url_rewrite', '__return_true' );
+// WordPress doesn't know that serverlesswp-node emulates typical mod_rewrite behaviour.
+add_filter( 'got_url_rewrite', '__return_true' );
+
+
+// A notice to let people know they can't directly install themes.
+function serverlesswp_theme_install_notice() {
+    global $pagenow;
+    $pages = ['themes.php'];
+    if (is_admin() && in_array($pagenow, $pages)) {
+        ?>
+            <div class="notice notice-info">
+                <h2><?php _e( 'Want to add a theme?', 'serverlesswp' ); ?></h2>
+                <p><?php _e( 'Direct theme installation is not currently possible with serverless functions. You can still add themes to your site though!', 'serverlesswp' ); ?></p>
+                <p><?php _e( '<a href="https://github.com/mitchmac/ServerlessWP/discussions/35">Learn how to add themes to your site\'s git repository.</a>', 'serverlesswp' ); ?></p>
+            </div>
+        <?php
+    }
+}
+
+// Register the notice action.
+add_action('admin_notices', 'serverlesswp_theme_install_notice');
+
+// A notice to let people know they can't directly install themes.
+function serverlesswp_plugin_install_notice() {
+    global $pagenow;
+    $pages = ['plugin-install.php', 'plugins.php'];
+    if (is_admin() && in_array($pagenow, $pages)) {
+        ?>
+            <div class="notice notice-info">
+                <h2><?php _e( 'Want to add a plugin?', 'serverlesswp' ); ?></h2>
+                <p><?php _e( 'Direct plugin installation is not currently possible with serverless functions. You can still add plugins to your site though!', 'serverlesswp' ); ?></p>
+                <p><?php _e( '<a href="https://github.com/mitchmac/ServerlessWP/discussions/35">Learn how to add plugins to your site\'s git repository.</a>', 'serverlesswp' ); ?></p>
+            </div>
+        <?php
+    }
+}
+
+// Register the notice action.
+add_action('admin_notices', 'serverlesswp_plugin_install_notice');