Support migrate to 0

Author: dantleech

README.md

@@ -1,9 +1,12 @@
 PHPCR Migrations
 ================
 
-Migrations library for PHPCR based heavily on [Doctrine
+Migrations library for PHPCR influenced by [Doctrine
 migrations](https://github.com/doctrine/migrations).
 
+For integration with Symfony see the [PHPCR Migrations
+Bundle](https://github.com/dantleech/phpcr-migrations-bundle).
+
 Usage
 -----
 

lib/Migrator.php

@@ -63,7 +63,7 @@ public function migrate($to = null, OutputInterface $output)
 
         $to = (string) $to;
 
-        if (!$this->versionCollection->has($to)) {
+        if ($to !== 'V0' && !$this->versionCollection->has($to)) {
             throw MigratorException::unknownVersion($to);
         }
 
@@ -93,8 +93,6 @@ public function migrate($to = null, OutputInterface $output)
             $this->session->save();
         }
 
-
-
         return $versionsToExecute;
     }
 }

lib/MigratorException.php

@@ -36,4 +36,15 @@ public static function cannotInitializeAlreadyHasVersions()
     {
         return new self('Cannot initiaialize a content repository with previously existing migrations.');
     }
+
+    public static function noClassesInVersionFile($file)
+    {
+        return new self(sprintf('No classes found in version file "%s"', $file));
+    }
+
+    public static function moreThanOneClassInVersionFile($file)
+    {
+        return new self(sprintf('More than one class found in version file "%s"', $file));
+    }
+
 }

lib/VersionFinder.php

@@ -34,11 +34,21 @@ public function getCollection()
 
         foreach ($finder as $versionFile) {
             $className = $versionFile->getBasename('.php');
+            $declaredClasses = get_declared_classes();
             require_once($versionFile->getRealPath());
-            if (!class_exists($className)) {
-                throw MigratorException::couldNotIntantiateVersionClass($className);
+            $newClasses = array_diff(get_declared_classes(), $declaredClasses);
+
+            if (count($newClasses) === 0) {
+                throw MigratorException::noClassesInVersionFile($versionFile->getBaseName());
+            }
+
+            if (count($newClasses) !== 1) {
+                throw MigratorException::moreThanOneClassInVersionFile($versionFile->getBaseName());
             }
-            $version = new $className();
+
+            $classFqn = reset($newClasses);
+
+            $version = new $classFqn();
 
             if (!$version instanceof VersionInterface) {
                 throw MigratorException::versionNotInstance($className);