fix: prevent activation fatal when installed without vendor/

CHANGELOG.md

@@ -9,6 +9,14 @@ is pre-1.0 and under active development.
 
 ## [Unreleased]
 
+### Fixed
+- **Activation fatal error when installed without Composer's `vendor/`:** the
+  bootstrap only loaded classes via `vendor/autoload.php`, so a distributed zip
+  that shipped without a `vendor/` directory fataled on activation with
+  `Uncaught Error: Class "AssetDrips\Db\Schema" not found`. The plugin now falls
+  back to a minimal built-in PSR-4 autoloader (it has no third-party runtime
+  dependencies), making it self-contained regardless of how it is packaged.
+
 ## [1.0.0] - 2026-06-19
 
 First public release of AssetDrips as an open-source (GPL-2.0-or-later) WordPress

assetdrips.php

@@ -26,10 +26,30 @@
 define( 'ASSETDRIPS_DIR', plugin_dir_path( __FILE__ ) );
 define( 'ASSETDRIPS_URL', plugin_dir_url( __FILE__ ) );
 
-// Composer autoloader. Required for the PSR-4 AssetDrips\ namespace.
+// Load the PSR-4 AssetDrips\ namespace. Prefer Composer's autoloader when a
+// vendor/ directory is present (dev checkouts, or a build that bundles it); fall
+// back to a minimal self-contained autoloader otherwise. The plugin has no
+// third-party runtime dependencies, so mapping AssetDrips\ -> src/ is all that
+// is needed for a distributed zip that ships without vendor/. Without this
+// fallback, activation fataled with "Class AssetDrips\Db\Schema not found".
 $assetdrips_autoload = __DIR__ . '/vendor/autoload.php';
 if ( is_readable( $assetdrips_autoload ) ) {
 	require $assetdrips_autoload;
+} else {
+	spl_autoload_register(
+		static function ( string $class ): void {
+			$prefix = 'AssetDrips\\';
+			$len    = strlen( $prefix );
+			if ( strncmp( $class, $prefix, $len ) !== 0 ) {
+				return;
+			}
+			$relative = str_replace( '\\', '/', substr( $class, $len ) );
+			$file     = __DIR__ . '/src/' . $relative . '.php';
+			if ( is_readable( $file ) ) {
+				require $file;
+			}
+		}
+	);
 }
 
 /**