feature symfony#28521 [Yaml] Added support for multiple files or directories in LintCommand (yceruto)

This PR was squashed before being merged into the 4.2-dev branch (closes symfony#28521).

Discussion
----------

[Yaml] Added support for multiple files or directories in LintCommand

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#28498
| License       | MIT
| Doc PR        | symfony/symfony-docs#10367

Commits
-------

d0f7950 [Yaml] Added support for multiple files or directories in LintCommand

Author: nicolas-grekas

src/Symfony/Component/Yaml/CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+4.2.0
+-----
+
+ * added support for multiple files or directories in `LintCommand`
+
 4.0.0
 -----
 

src/Symfony/Component/Yaml/Command/LintCommand.php

@@ -14,6 +14,7 @@
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Exception\InvalidArgumentException;
 use Symfony\Component\Console\Exception\RuntimeException;
+use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
@@ -53,7 +54,7 @@ protected function configure()
     {
         $this
             ->setDescription('Lints a file and outputs encountered errors')
-            ->addArgument('filename', null, 'A file or a directory or STDIN')
+            ->addArgument('filename', InputArgument::IS_ARRAY, 'A file or a directory or STDIN')
             ->addOption('format', null, InputOption::VALUE_REQUIRED, 'The output format', 'txt')
             ->addOption('parse-tags', null, InputOption::VALUE_NONE, 'Parse custom tags')
             ->setHelp(<<<EOF
@@ -81,26 +82,28 @@ protected function configure()
     protected function execute(InputInterface $input, OutputInterface $output)
     {
         $io = new SymfonyStyle($input, $output);
-        $filename = $input->getArgument('filename');
+        $filenames = (array) $input->getArgument('filename');
         $this->format = $input->getOption('format');
         $this->displayCorrectFiles = $output->isVerbose();
         $flags = $input->getOption('parse-tags') ? Yaml::PARSE_CUSTOM_TAGS : 0;
 
-        if (!$filename) {
+        if (0 === \count($filenames)) {
             if (!$stdin = $this->getStdin()) {
                 throw new RuntimeException('Please provide a filename or pipe file content to STDIN.');
             }
 
             return $this->display($io, array($this->validate($stdin, $flags)));
         }
 
-        if (!$this->isReadable($filename)) {
-            throw new RuntimeException(sprintf('File or directory "%s" is not readable.', $filename));
-        }
-
         $filesInfo = array();
-        foreach ($this->getFiles($filename) as $file) {
-            $filesInfo[] = $this->validate(file_get_contents($file), $flags, $file);
+        foreach ($filenames as $filename) {
+            if (!$this->isReadable($filename)) {
+                throw new RuntimeException(sprintf('File or directory "%s" is not readable.', $filename));
+            }
+
+            foreach ($this->getFiles($filename) as $file) {
+                $filesInfo[] = $this->validate(file_get_contents($file), $flags, $file);
+            }
         }
 
         return $this->display($io, $filesInfo);

src/Symfony/Component/Yaml/Tests/Command/LintCommandTest.php

@@ -37,6 +37,18 @@ public function testLintCorrectFile()
         $this->assertRegExp('/^\/\/ OK in /', trim($tester->getDisplay()));
     }
 
+    public function testLintCorrectFiles()
+    {
+        $tester = $this->createCommandTester();
+        $filename1 = $this->createFile('foo: bar');
+        $filename2 = $this->createFile('bar: baz');
+
+        $ret = $tester->execute(array('filename' => array($filename1, $filename2)), array('verbosity' => OutputInterface::VERBOSITY_VERBOSE, 'decorated' => false));
+
+        $this->assertEquals(0, $ret, 'Returns 0 in case of success');
+        $this->assertRegExp('/^\/\/ OK in /', trim($tester->getDisplay()));
+    }
+
     public function testLintIncorrectFile()
     {
         $incorrectContent = '