Restore the ability to list the scripts in the 'run-script' command without providing a script

phpstan/baseline.neon

@@ -6053,6 +6053,11 @@ parameters:
 			count: 1
 			path: ../tests/Composer/Test/CacheTest.php
 
+		-
+			message: "#^Dynamic call to static method Composer\\\\Test\\\\TestCase\\:\\:getUniqueTmpDirectory\\(\\)\\.$#"
+			count: 1
+			path: ../tests/Composer/Test/Command/RunScriptCommandTest.php
+
 		-
 			message: "#^Dynamic call to static method Composer\\\\Test\\\\TestCase\\:\\:getUniqueTmpDirectory\\(\\)\\.$#"
 			count: 1

src/Composer/Command/RunScriptCommand.php

@@ -54,7 +54,7 @@ protected function configure(): void
             ->setAliases(array('run'))
             ->setDescription('Runs the scripts defined in composer.json.')
             ->setDefinition(array(
-                new InputArgument('script', InputArgument::REQUIRED, 'Script name to run.'),
+                new InputArgument('script', InputArgument::OPTIONAL, 'Script name to run.'),
                 new InputArgument('args', InputArgument::IS_ARRAY | InputArgument::OPTIONAL, ''),
                 new InputOption('timeout', null, InputOption::VALUE_REQUIRED, 'Sets script timeout in seconds, or 0 for never.'),
                 new InputOption('dev', null, InputOption::VALUE_NONE, 'Sets the dev mode.'),
@@ -80,6 +80,10 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         }
 
         $script = $input->getArgument('script');
+        if ($script === null) {
+            throw new \RuntimeException('Missing required argument "script"');
+        }
+
         if (!in_array($script, $this->scriptEvents)) {
             if (defined('Composer\Script\ScriptEvents::'.str_replace('-', '_', strtoupper($script)))) {
                 throw new \InvalidArgumentException(sprintf('Script "%s" cannot be run with this command', $script));

tests/Composer/Test/Command/RunScriptCommandTest.php

@@ -12,13 +12,35 @@
 
 namespace Composer\Test\Command;
 
+use Composer\Command\RunScriptCommand;
 use Composer\Composer;
 use Composer\Config;
+use Composer\Console\Application;
 use Composer\Script\Event as ScriptEvent;
 use Composer\Test\TestCase;
+use Composer\Util\Filesystem;
+use Symfony\Component\Console\Tester\ApplicationTester;
 
 class RunScriptCommandTest extends TestCase
 {
+    /**
+     * @var string
+     */
+    private $home;
+
+    public function setUp(): void
+    {
+        $this->home = $this->getUniqueTmpDirectory();
+    }
+
+    protected function tearDown(): void
+    {
+        parent::tearDown();
+
+        $fs = new Filesystem();
+        $fs->removeDirectory($this->home);
+    }
+
     /**
      * @dataProvider getDevOptions
      * @param bool $dev
@@ -88,6 +110,35 @@ public function testDetectAndPassDevModeToEventAndToDispatching(bool $dev, bool
         $command->run($input, $output);
     }
 
+    public function testCanListScripts(): void
+    {
+        $manifest = [
+            'scripts' => [
+                'test' => '@php test',
+                'fix-cs' => 'php-cs-fixer fix',
+            ],
+            'scripts-descriptions' => [
+                'fix-cs' => 'Run the codestyle fixer',
+            ],
+        ];
+
+        file_put_contents($this->home.'/composer.json', json_encode($manifest));
+
+        $application = new Application();
+        $application->setAutoExit(false);
+        $application->add(new RunScriptCommand());
+
+        $tester = new ApplicationTester($application);
+        $tester->run(['command' => 'run-script', '--list' => true, '-d' => $this->home]);
+
+        $tester->assertCommandIsSuccessful();
+
+        $output = $tester->getDisplay();
+
+        $this->assertStringContainsString('Runs the test script as defined in composer.json.', $output, 'The default description for the test script should be printed');
+        $this->assertStringContainsString('Run the codestyle fixer', $output, 'The custom description for the fix-cs script should be printed');
+    }
+
     /** @return bool[][] **/
     public function getDevOptions(): array
     {