Implement loading existing migration classes from the filesystem

[MAILPOET-4466]

mailpoet/lib/Migrator/Repository.php

@@ -2,6 +2,10 @@
 
 namespace MailPoet\Migrator;
 
+use RecursiveDirectoryIterator;
+use RecursiveIteratorIterator;
+use SplFileInfo;
+
 class Repository {
   /** @var string */
   private $migrationsDir;
@@ -29,6 +33,21 @@ class Repository {
     }
   }
 
+  public function loadAll(): array {
+    $files = new RecursiveIteratorIterator(
+      new RecursiveDirectoryIterator($this->migrationsDir, RecursiveDirectoryIterator::SKIP_DOTS)
+    );
+
+    $migrations = [];
+    foreach ($files as $file) {
+      if ($file instanceof SplFileInfo && $file->isFile() && strtolower($file->getExtension()) === 'php') {
+        $migrations[] = $file->getBasename('.' . $file->getExtension());
+      }
+    }
+    sort($migrations);
+    return $migrations;
+  }
+
   private function generateName(): string {
     return 'Migration_' . gmdate('Ymd_his');
   }

mailpoet/tests/unit/Migrator/RepositoryTest.php

@@ -55,6 +55,18 @@ class RepositoryTest extends MailPoetUnitTest {
     $repository->create();
   }
 
+  public function testItLoadsMigrationFiles(): void {
+    $repository = $this->make(Repository::class, [
+      'migrationsDir' => __DIR__ . '/TestMigrations',
+    ]);
+    $this->assertSame([
+      'Migration_1',
+      'Migration_2',
+      'Migration_3',
+      'Migration_4',
+    ], $repository->loadAll());
+  }
+
   public function _after() {
     parent::_after();
     $this->removeDir(self::MIGRATIONS_OUTPUT_DIR);

mailpoet/tests/unit/Migrator/TestMigrations/.dotfile

@@ -0,0 +1 @@
+This file should not be loaded by migrations repository.

mailpoet/tests/unit/Migrator/TestMigrations/Migration_1.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Migrations;
+
+use MailPoet\Migrator\Migration;
+
+class Migration_1 extends Migration {
+  public function run(): void {
+  }
+}

mailpoet/tests/unit/Migrator/TestMigrations/Migration_2.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Migrations;
+
+use MailPoet\Migrator\Migration;
+
+class Migration_2 extends Migration {
+  public function run(): void {
+  }
+}

mailpoet/tests/unit/Migrator/TestMigrations/subdirectory/Migration_3.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Migrations;
+
+use MailPoet\Migrator\Migration;
+
+class Migration_3 extends Migration {
+  public function run(): void {
+  }
+}

mailpoet/tests/unit/Migrator/TestMigrations/subdirectory/nested/Migration_4.php

@@ -0,0 +1,10 @@
+<?php declare(strict_types = 1);
+
+namespace MailPoet\Migrations;
+
+use MailPoet\Migrator\Migration;
+
+class Migration_4 extends Migration {
+  public function run(): void {
+  }
+}

mailpoet/tests/unit/Migrator/TestMigrations/text-file.txt

@@ -0,0 +1 @@
+This file should not be loaded by migrations repository.