feat(Console): Add --check option to diff command

This option allows checking for schema differences in a CI/CD environment without generating a file.

It exits with a non-zero status code if changes are detected, providing a clear signal for CI workflows and actionable feedback for developers.

Author: ahmed-bhs

src/Generator/DiffGenerator.php

@@ -37,6 +37,38 @@ public function __construct(
     ) {
     }
 
+    public function hasChanges(string|null $filterExpression, bool $fromEmptySchema = false): bool
+    {
+        if ($filterExpression !== null) {
+            $this->dbalConfiguration->setSchemaAssetsFilter(
+                static function ($assetName) use ($filterExpression) {
+                    if ($assetName instanceof AbstractAsset) {
+                        $assetName = $assetName->getName();
+                    }
+
+                    return preg_match($filterExpression, $assetName);
+                },
+            );
+        }
+
+        $fromSchema = $fromEmptySchema
+            ? $this->createEmptySchema()
+            : $this->createFromSchema();
+
+        $toSchema = $this->createToSchema();
+
+        if (class_exists(ComparatorConfig::class)) {
+            $comparator = $this->schemaManager->createComparator((new ComparatorConfig())->withReportModifiedIndexes(false));
+        } else {
+            $comparator = $this->schemaManager->createComparator();
+        }
+
+        $upSql   = $this->platform->getAlterSchemaSQL($comparator->compareSchemas($fromSchema, $toSchema));
+        $downSql = $this->platform->getAlterSchemaSQL($comparator->compareSchemas($toSchema, $fromSchema));
+
+        return $upSql !== [] || $downSql !== [];
+    }
+
     /** @throws NoChangesDetected */
     public function generate(
         string $fqcn,

src/Tools/Console/Command/DiffCommand.php

@@ -42,9 +42,9 @@ protected function configure(): void
             ->setHelp(<<<'EOT'
 The <info>%command.name%</info> command generates a migration by comparing your current database to your mapping information:
 
-    <info>%command.full_name%</info>
+	<info>%command.full_name%</info>
 
-EOT)
+EOT,)
             ->addOption(
                 'namespace',
                 null,
@@ -94,6 +94,12 @@ protected function configure(): void
                 null,
                 InputOption::VALUE_NONE,
                 'Generate a full migration as if the current database was empty.',
+            )
+            ->addOption(
+                'check',
+                null,
+                InputOption::VALUE_NONE,
+                'Check if a migration is needed and exit with a non-zero status code if it is.',
             );
     }
 
@@ -107,13 +113,34 @@ protected function execute(
             $filterExpression = null;
         }
 
+        $fromEmptySchema = $input->getOption('from-empty-schema');
+        $check           = $input->getOption('check');
+
+        $diffGenerator = $this->getDependencyFactory()->getDiffGenerator();
+
+        if ($check) {
+            if ($diffGenerator->hasChanges($filterExpression, $fromEmptySchema)) {
+                $this->io->error([
+                    'The database schema is not in sync with the mapping.',
+                    'Run the following command to generate a migration:',
+                    '',
+                    'bin/console doctrine:migrations:diff',
+                ]);
+
+                return 1;
+            }
+
+            $this->io->success('The database schema is in sync with the mapping. No migration required.');
+
+            return 0;
+        }
+
         $formatted       = filter_var($input->getOption('formatted'), FILTER_VALIDATE_BOOLEAN);
         $nowdocOutput    = $input->getOption('nowdoc');
         $nowdocOutput    = $nowdocOutput === null ? null : filter_var($input->getOption('nowdoc'), FILTER_VALIDATE_BOOLEAN);
         $lineLength      = (int) $input->getOption('line-length');
         $allowEmptyDiff  = $input->getOption('allow-empty-diff');
         $checkDbPlatform = filter_var($input->getOption('check-database-platform'), FILTER_VALIDATE_BOOLEAN);
-        $fromEmptySchema = $input->getOption('from-empty-schema');
 
         if ($formatted) {
             if (! class_exists(SqlFormatter::class)) {
@@ -135,8 +162,7 @@ protected function execute(
             return 3;
         }
 
-        $fqcn          = $this->getDependencyFactory()->getClassNameGenerator()->generateClassName($namespace);
-        $diffGenerator = $this->getDependencyFactory()->getDiffGenerator();
+        $fqcn = $this->getDependencyFactory()->getClassNameGenerator()->generateClassName($namespace);
 
         try {
             $path = $diffGenerator->generate(

tests/Tools/Console/Command/DiffCommandTest.php

@@ -182,6 +182,54 @@ public function testExecuteWithMultipleDirectories(int|null $input, string $name
         self::assertStringContainsString(sprintf('You have selected the "%s" namespace', $namespace), $output);
     }
 
+    public function testCheckReturnsZeroWhenNoChanges(): void
+    {
+        $this->migrationDiffGenerator
+            ->expects(self::once())
+            ->method('hasChanges')
+            ->with(null, false)
+            ->willReturn(false);
+
+        $this->migrationDiffGenerator
+            ->expects(self::never())
+            ->method('generate');
+
+        $this->diffCommandTester->execute(['--check' => true]);
+
+        $output     = $this->diffCommandTester->getDisplay(true);
+        $statusCode = $this->diffCommandTester->getStatusCode();
+
+        self::assertStringContainsString('[OK] The database schema is in sync with the mapping. No migration required.', $output);
+        self::assertSame(0, $statusCode);
+    }
+
+    public function testCheckReturnsOneWhenChanges(): void
+    {
+        $this->migrationDiffGenerator
+            ->expects(self::once())
+            ->method('hasChanges')
+            ->with('filter', true)
+            ->willReturn(true);
+
+        $this->migrationDiffGenerator
+            ->expects(self::never())
+            ->method('generate');
+
+        $this->diffCommandTester->execute([
+            '--check' => true,
+            '--filter-expression' => 'filter',
+            '--from-empty-schema' => true,
+        ]);
+
+        $output     = $this->diffCommandTester->getDisplay(true);
+        $statusCode = $this->diffCommandTester->getStatusCode();
+
+        self::assertStringContainsString('[ERROR] The database schema is not in sync with the mapping.', $output);
+        self::assertStringContainsString('Run the following command to generate a migration:', $output);
+        self::assertStringContainsString('bin/console doctrine:migrations:diff', $output);
+        self::assertSame(1, $statusCode);
+    }
+
     protected function setUp(): void
     {
         $this->migrationDiffGenerator    = $this->createMock(DiffGenerator::class);