refactors cli boostrap (#288)

relies on composer runtime api when possibile and provides a fallback

Author: fain182

bin-stub/phparkitect

@@ -4,16 +4,30 @@ declare(strict_types=1);
 
 use Arkitect\CLI\PhpArkitectApplication;
 
-foreach (array(__DIR__ . '/../../../autoload.php', __DIR__ . '/../../autoload.php', __DIR__ . '/../vendor/autoload.php', __DIR__ . '/vendor/autoload.php') as $file) {
-    if (file_exists($file)) {
-        define('PHPARKITECT_COMPOSER_INSTALL', $file);
-
-        break;
+// $_composer_autoload_path is set by composer (available from composer 2.2)
+// https://getcomposer.org/doc/articles/vendor-binaries.md#finding-the-composer-autoloader-from-a-binary
+if (isset($_composer_autoload_path)) {
+    
+    define('PHPARKITECT_COMPOSER_INSTALL', $_composer_autoload_path);
+
+} else {
+// if $_composer_autoload_path is not set, we will try to find the autoload.php file
+// guessing the location of the phparkitect binary
+// ps: e2e tests are run from the bin-stub dir and needs that
+    $possible_autoload_locations = [ 
+        __DIR__ . '/../../autoload.php',        // inside vendor dir like "vendor/phparkitect/bin"
+        __DIR__ . '/../vendor/autoload.php',    // first level project dir like "bin"
+        __DIR__ . '/vendor/autoload.php'        // project root
+    ];
+    
+    foreach ($possible_autoload_locations as $path) {
+        if (file_exists($path)) {
+            define('PHPARKITECT_COMPOSER_INSTALL', $path);
+            break;
+        }
     }
 }
 
-unset($file);
-
 if (!defined('PHPARKITECT_COMPOSER_INSTALL')) {
     fwrite(
         STDERR,