feature #29781 [DI] Add trim env processor (ogizanagi)

This PR was merged into the 4.3-dev branch.

Discussion
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[DI] Add trim env processor

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | #26708  <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | Todo

Which is especially useful in combination with the `file` env processor.

Commits
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e226492db7 [DI] Add trim env processor

src/Symfony/Component/DependencyInjection/CHANGELOG.md

@@ -4,6 +4,7 @@ CHANGELOG
 4.3.0
 -----
 
+ * added `%env(trim:...)%` processor to trim a string value
  * added `%env(default:...)%` processor to fallback to a default value
 
 4.2.0

src/Symfony/Component/DependencyInjection/EnvVarProcessor.php

@@ -44,6 +44,7 @@ class EnvVarProcessor implements EnvVarProcessorInterface
             'resolve' => 'string',
             'default' => 'bool|int|float|string|array',
             'string' => 'string',
+            'trim' => 'string',
         );
     }
 
@@ -194,6 +195,10 @@ class EnvVarProcessor implements EnvVarProcessorInterface
             return str_getcsv($env);
         }
 
+        if ('trim' === $prefix) {
+            return trim($env);
+        }
+
         throw new RuntimeException(sprintf('Unsupported env var prefix "%s".', $prefix));
     }
 }

src/Symfony/Component/DependencyInjection/Tests/Compiler/RegisterEnvVarProcessorsPassTest.php

@@ -42,6 +42,7 @@ class RegisterEnvVarProcessorsPassTest extends TestCase
             'resolve' => array('string'),
             'default' => array('bool', 'int', 'float', 'string', 'array'),
             'string' => array('string'),
+            'trim' => array('string'),
         );
 
         $this->assertSame($expected, $container->getParameterBag()->getProvidedTypes());

src/Symfony/Component/DependencyInjection/Tests/EnvVarProcessorTest.php

@@ -233,6 +233,19 @@ class EnvVarProcessorTest extends TestCase
         $this->assertSame('hello', $result);
     }
 
+    public function testGetEnvTrim()
+    {
+        $processor = new EnvVarProcessor(new Container());
+
+        $result = $processor->getEnv('trim', 'foo', function ($name) {
+            $this->assertSame('foo', $name);
+
+            return " hello\n";
+        });
+
+        $this->assertSame('hello', $result);
+    }
+
     /**
      * @dataProvider validJson
      */