Add strict mode

.gitattributes

@@ -2,6 +2,6 @@
 /.github export-ignore
 .gitattributes export-ignore
 .gitignore export-ignore
-.php_cs.dist export-ignore
+.php-cs-fixer.dist.php export-ignore
 phpunit.xml.dist export-ignore
 infection.json.dist export-ignore

README.md

@@ -82,6 +82,21 @@ composer diff -p # include platform dependencies
 composer diff -f json # Output as JSON instead of table
 ```
 
+### Strict mode
+
+To help you control your dependencies, you may pass `--strict` option when running in CI. If there are any changes detected, a non-zero exit code will be returned.
+
+Exit code of the command is built using following bit flags:
+
+*  `0` - OK.
+*  `1` - General error.
+*  `2` - There were changes in prod packages.
+*  `4` - There were changes is dev packages.
+*  `8` - There were downgrades in prod packages.
+* `16` - There were downgrades in dev packages.
+
+You may check for individual flags or simply check if the status is greater or equal 8 if you don't want to downgrade any package.
+
 # Similar packages
 
 While there are several existing packages offering similar functionality:

src/Command/DiffCommand.php

@@ -3,6 +3,8 @@
 namespace IonBazan\ComposerDiff\Command;
 
 use Composer\Command\BaseCommand;
+use Composer\DependencyResolver\Operation\OperationInterface;
+use Composer\DependencyResolver\Operation\UpdateOperation;
 use IonBazan\ComposerDiff\Formatter\Formatter;
 use IonBazan\ComposerDiff\Formatter\JsonFormatter;
 use IonBazan\ComposerDiff\Formatter\MarkdownListFormatter;
@@ -16,6 +18,10 @@
 
 class DiffCommand extends BaseCommand
 {
+    const CHANGES_PROD = 2;
+    const CHANGES_DEV = 4;
+    const DOWNGRADES_PROD = 8;
+    const DOWNGRADES_DEV = 16;
     /**
      * @var PackageDiff
      */
@@ -54,43 +60,61 @@ protected function configure()
             ->addOption('with-links', 'l', InputOption::VALUE_NONE, 'Include compare/release URLs')
             ->addOption('format', 'f', InputOption::VALUE_REQUIRED, 'Output format (mdtable, mdlist, json)', 'mdtable')
             ->addOption('gitlab-domains', null, InputOption::VALUE_REQUIRED | InputOption::VALUE_IS_ARRAY, 'Extra Gitlab domains (inherited from Composer config by default)', array())
+            ->addOption('strict', 's', InputOption::VALUE_NONE, 'Return non-zero exit code if there are any changes')
             ->setHelp(<<<'EOF'
-The <comment>%command.name%</comment> command displays all dependency changes between two <info>composer.lock</info> files.
-By default, it will compare current filesystem changes with git <info>HEAD</info>:
+The <info>%command.name%</info> command displays all dependency changes between two <comment>composer.lock</comment> files.
 
-    <comment>%command.full_name%</comment>
+By default, it will compare current filesystem changes with git <comment>HEAD</comment>:
+
+    <info>%command.full_name%</info>
 
 To compare with specific branch, pass its name as argument:
 
-    <comment>%command.full_name% master</comment>
+    <info>%command.full_name% master</info>
 
 You can specify any valid git refs to compare with:
 
-    <comment>%command.full_name% HEAD~3 be4aabc</comment>
+    <info>%command.full_name% HEAD~3 be4aabc</info>
 
 You can also use more verbose syntax for <info>base</info> and <info>target</info> options:
 
-    <comment>%command.full_name% --base master --target composer.lock</comment>
+    <info>%command.full_name% --base master --target composer.lock</info>
 
 To compare files in specific path, use following syntax:
 
-    <comment>%command.full_name% master:subdirectory/composer.lock /path/to/another/composer.lock</comment>
+    <info>%command.full_name% master:subdirectory/composer.lock /path/to/another/composer.lock</info>
 
-By default, <info>platform</info> dependencies are hidden. Add <comment>--with-platform</comment> option to include them in the report:
+By default, <info>platform</info> dependencies are hidden. Add <info>--with-platform</info> option to include them in the report:
 
-    <comment>%command.full_name% --with-platform</comment>
+    <info>%command.full_name% --with-platform</info>
 
-Use <comment>--with-links</comment> to include release and compare URLs in the report:
+Use <info>--with-links</info> to include release and compare URLs in the report:
 
-    <comment>%command.full_name% --with-links</comment>
+    <info>%command.full_name% --with-links</info>
 
-You can customize output format by specifying it with <comment>--format</comment> option. Choose between <info>mdtable</info>, <info>mdlist</info> and <info>json</info>:
+You can customize output format by specifying it with <info>--format</info> option. Choose between <comment>mdtable</comment>, <comment>mdlist</comment> and <comment>json</comment>:
+
+    <info>%command.full_name% --format=json</info>
+
+Hide <info>dev</info> dependencies using <info>--no-dev</info> option:
+
+    <info>%command.full_name% --no-dev</info>
+
+Passing <info>--strict</info> option may help you to disallow changes or downgrades by returning non-zero exit code:
+
+    <info>%command.full_name% --strict</info>
 
-    <comment>%command.full_name% --format=json</comment>
+Exit code
+---------
 
-Hide <info>dev</info> dependencies using <comment>--no-dev</comment> option:
+Exit code of the command is built using following bit flags:
 
-    <comment>%command.full_name% --no-dev</comment>
+*  0 - OK.
+*  1 - General error.
+*  2 - There were changes in prod packages.
+*  4 - There were changes is dev packages.
+*  8 - There were downgrades in prod packages.
+* 16 - There were downgrades in dev packages.
 EOF
             )
         ;
@@ -122,7 +146,50 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         $formatter->render($prodOperations, $devOperations, $withUrls);
 
-        return 0;
+        return $input->getOption('strict') ? $this->getExitCode($prodOperations, $devOperations) : 0;
+    }
+
+    /**
+     * @param OperationInterface[] $prodOperations
+     * @param OperationInterface[] $devOperations
+     *
+     * @return int Exit code
+     */
+    private function getExitCode(array $prodOperations, array $devOperations)
+    {
+        $exitCode = 0;
+
+        if (!empty($prodOperations)) {
+            $exitCode = self::CHANGES_PROD;
+
+            if ($this->hasDowngrades($prodOperations)) {
+                $exitCode |= self::DOWNGRADES_PROD;
+            }
+        }
+
+        if (!empty($devOperations)) {
+            $exitCode |= self::CHANGES_DEV;
+
+            if ($this->hasDowngrades($devOperations)) {
+                $exitCode |= self::DOWNGRADES_DEV;
+            }
+        }
+
+        return $exitCode;
+    }
+
+    /**
+     * @param OperationInterface[] $operations
+     *
+     * @return bool
+     */
+    private function hasDowngrades(array $operations)
+    {
+        $downgrades = array_filter($operations, function (OperationInterface $operation) {
+            return $operation instanceof UpdateOperation && !PackageDiff::isUpgrade($operation);
+        });
+
+        return !empty($downgrades);
     }
 
     /**

src/Formatter/AbstractFormatter.php

@@ -7,11 +7,8 @@
 use Composer\DependencyResolver\Operation\UninstallOperation;
 use Composer\DependencyResolver\Operation\UpdateOperation;
 use Composer\Package\PackageInterface;
-use Composer\Semver\Semver;
-use Composer\Semver\VersionParser;
 use IonBazan\ComposerDiff\Url\GeneratorContainer;
 use Symfony\Component\Console\Output\OutputInterface;
-use UnexpectedValueException;
 
 abstract class AbstractFormatter implements Formatter
 {
@@ -74,21 +71,4 @@ private function getReleaseUrl(PackageInterface $package)
 
         return $generator->getReleaseUrl($package);
     }
-
-    /**
-     * @return bool
-     */
-    protected static function isUpgrade(UpdateOperation $operation)
-    {
-        $versionParser = new VersionParser();
-        try {
-            $normalizedFrom = $versionParser->normalize($operation->getInitialPackage()->getVersion());
-            $normalizedTo = $versionParser->normalize($operation->getTargetPackage()->getVersion());
-        } catch (UnexpectedValueException $e) {
-            return true; // Consider as upgrade if versions are not parsable
-        }
-        $sorted = Semver::sort(array($normalizedTo, $normalizedFrom));
-
-        return $sorted[0] === $normalizedFrom;
-    }
 }

src/Formatter/JsonFormatter.php

@@ -6,6 +6,7 @@
 use Composer\DependencyResolver\Operation\OperationInterface;
 use Composer\DependencyResolver\Operation\UninstallOperation;
 use Composer\DependencyResolver\Operation\UpdateOperation;
+use IonBazan\ComposerDiff\PackageDiff;
 
 class JsonFormatter extends AbstractFormatter
 {
@@ -78,7 +79,7 @@ private function transformOperation(OperationInterface $operation)
         if ($operation instanceof UpdateOperation) {
             return array(
                 'name' => $operation->getInitialPackage()->getName(),
-                'operation' => self::isUpgrade($operation) ? 'upgrade' : 'downgrade',
+                'operation' => PackageDiff::isUpgrade($operation) ? 'upgrade' : 'downgrade',
                 'version_base' => $operation->getInitialPackage()->getFullPrettyVersion(),
                 'version_target' => $operation->getTargetPackage()->getFullPrettyVersion(),
             );

src/Formatter/MarkdownListFormatter.php

@@ -6,6 +6,7 @@
 use Composer\DependencyResolver\Operation\OperationInterface;
 use Composer\DependencyResolver\Operation\UninstallOperation;
 use Composer\DependencyResolver\Operation\UpdateOperation;
+use IonBazan\ComposerDiff\PackageDiff;
 
 class MarkdownListFormatter extends MarkdownFormatter
 {
@@ -58,7 +59,7 @@ private function getRow(OperationInterface $operation, $withUrls)
         }
 
         if ($operation instanceof UpdateOperation) {
-            $isUpgrade = self::isUpgrade($operation);
+            $isUpgrade = PackageDiff::isUpgrade($operation);
 
             return sprintf(
                 ' - %s <fg=green>%s</> (<fg=yellow>%s</> => <fg=yellow>%s</>)%s',

src/Formatter/MarkdownTableFormatter.php

@@ -7,6 +7,7 @@
 use Composer\DependencyResolver\Operation\UninstallOperation;
 use Composer\DependencyResolver\Operation\UpdateOperation;
 use IonBazan\ComposerDiff\Formatter\Helper\Table;
+use IonBazan\ComposerDiff\PackageDiff;
 
 class MarkdownTableFormatter extends MarkdownFormatter
 {
@@ -68,7 +69,7 @@ private function getTableRow(OperationInterface $operation)
         if ($operation instanceof UpdateOperation) {
             return array(
                 $operation->getInitialPackage()->getName(),
-                self::isUpgrade($operation) ? '<fg=cyan>Upgraded</>' : '<fg=yellow>Downgraded</>',
+                PackageDiff::isUpgrade($operation) ? '<fg=cyan>Upgraded</>' : '<fg=yellow>Downgraded</>',
                 $operation->getInitialPackage()->getFullPrettyVersion(),
                 $operation->getTargetPackage()->getFullPrettyVersion(),
             );

src/PackageDiff.php

@@ -9,6 +9,9 @@
 use Composer\Package\CompletePackage;
 use Composer\Package\Loader\ArrayLoader;
 use Composer\Repository\ArrayRepository;
+use Composer\Semver\Semver;
+use Composer\Semver\VersionParser;
+use UnexpectedValueException;
 
 class PackageDiff
 {
@@ -50,6 +53,23 @@ public function getPackageDiff($from, $to, $dev, $withPlatform)
         return $operations;
     }
 
+    /**
+     * @return bool
+     */
+    public static function isUpgrade(UpdateOperation $operation)
+    {
+        $versionParser = new VersionParser();
+        try {
+            $normalizedFrom = $versionParser->normalize($operation->getInitialPackage()->getVersion());
+            $normalizedTo = $versionParser->normalize($operation->getTargetPackage()->getVersion());
+        } catch (UnexpectedValueException $e) {
+            return true; // Consider as upgrade if versions are not parsable
+        }
+        $sorted = Semver::sort(array($normalizedTo, $normalizedFrom));
+
+        return $sorted[0] === $normalizedFrom;
+    }
+
     /**
      * @param string $path
      * @param bool   $dev