Resolve env placeholders in configuration

doc/parameters.md

@@ -322,3 +322,19 @@ grumphp:
         paths:
             - tools
 ```
+
+## Configuration
+
+**Environment variables:**
+
+```yaml
+# grumphp.yml
+parameters:
+  env(FIXER_ENABLED): 'true'
+
+grumphp:
+    fixer:
+      enabled: '%env(bool:FIXER_ENABLED)%'
+```
+
+More about [Environment Variable Processors](https://symfony.com/doc/current/configuration/env_var_processors.html)

src/Configuration/ContainerBuilder.php

@@ -51,7 +51,7 @@ public static function buildFromConfiguration(string $path): SymfonyContainerBui
         $container->setParameter('config_file', $path);
 
         // Compile configuration to make sure that tasks are added to the taskrunner
-        $container->compile();
+        $container->compile(true);
 
         return $container;
     }

test/E2E/AbstractE2ETestCase.php

@@ -189,22 +189,27 @@ protected function ensureHooksExist(string $gitPath = null, string $containsPatt
         }
     }
 
-    protected function initializeGrumphpConfig(string $path, string $fileName = 'grumphp.yml'): string
+    protected function initializeGrumphpConfig(string $path, string $fileName = 'grumphp.yml', array $customConfig = []): string
     {
         $grumphpFile = $this->useCorrectDirectorySeparator($path.'/'.$fileName);
+        $config = [
+            'grumphp' => [
+                // Don't run E2E tests in parallel.
+                // This causes a deep nesting of parallel running tasks - which is causing some CI issues.
+                'parallel' => [
+                    'enabled' => false,
+                ],
+                'tasks' => [],
+            ],
+        ];
+
+        if ($customConfig) {
+            $config = array_merge_recursive($config, $customConfig);
+        }
 
         $this->filesystem->dumpFile(
             $grumphpFile,
-            Yaml::dump([
-                'grumphp' => [
-                    // Don't run E2E tests in parallel.
-                    // This causes a deep nesting of parallel running tasks - which is causing some CI issues.
-                    'parallel' => [
-                        'enabled' => false,
-                    ],
-                    'tasks' => []
-                ]
-            ])
+            Yaml::dump($config),
         );
 
         return $grumphpFile;
@@ -373,15 +378,17 @@ protected function gitAddPath(string $path)
         $this->runCommand('add files to git', new Process([$git, 'add', '-A'], $path));
     }
 
-    protected function runGrumphp(string $projectPath, $vendorPath = './vendor', $environment = [])
+    protected function runGrumphp(string $projectPath, string $vendorPath = './vendor', array $environment = []): Process
     {
         $projectPath = $this->relativeRootPath($projectPath);
-        $this->runCommand('grumphp run', (
-            new Process(
-                [$vendorPath.'/bin/grumphp', 'run', '-vvv'],
-                $projectPath
-            )
-        )->setEnv($environment));
+        $process = new Process(
+            [$vendorPath.'/bin/grumphp', 'run', '-vvv'],
+            $projectPath
+        );
+
+        $this->runCommand('grumphp run', $process->setEnv($environment));
+
+        return $process;
     }
 
     protected function runGrumphpWithConfig(string $projectPath, string $grumphpFile, $vendorPath = './vendor')

test/E2E/ConfigurationTest.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace GrumPHPTest\E2E;
+
+class ConfigurationTest extends AbstractE2ETestCase
+{
+    /** @test */
+    function it_should_be_able_to_resolve_env_variable_in_configuration()
+    {
+        $this->initializeGitInRootDir();
+        $this->initializeComposer($this->rootDir);
+        $grumphpFile = $this->initializeGrumphpConfig(path: $this->rootDir, customConfig: [
+            'parameters' => [
+                'env(GRUMPHP_PARAMETER_TEST)' => '~'
+            ],
+            'grumphp' => [
+                'ascii' => [
+                    'succeeded' => '%env(string:GRUMPHP_PARAMETER_TEST)%',
+                ],
+            ],
+        ]);
+
+        $this->installComposer($this->rootDir);
+        $this->ensureHooksExist();
+
+        $this->enableValidatePathsTask($grumphpFile, $this->rootDir);
+
+        $this->commitAll();
+        $process = $this->runGrumphp(projectPath: $this->rootDir, environment: [
+            'GRUMPHP_PARAMETER_TEST' => 'succeeded.txt',
+        ]);
+
+        $this->assertStringContainsString(
+            file_get_contents(PROJECT_BASE_PATH . '/resources/ascii/succeeded.txt'),
+            $process->getOutput(),
+        );
+    }
+}