Log file patching & don't revert patch when in debug mode

app/config.php

@@ -231,7 +231,11 @@
     },
     PrepareSolutionListener::class => create(),
     CodePatchListener::class => function (ContainerInterface $c) {
-        return new CodePatchListener($c->get(CodePatcher::class));
+        return new CodePatchListener(
+            $c->get(CodePatcher::class),
+            $c->get(LoggerInterface::class),
+            $c->get('debugMode')
+        );
     },
     SelfCheckListener::class => function (ContainerInterface $c) {
         return new SelfCheckListener($c->get(ResultAggregator::class));

src/Listener/CodePatchListener.php

@@ -8,6 +8,7 @@
 use PhpSchool\PhpWorkshop\Event\EventInterface;
 use PhpSchool\PhpWorkshop\Event\ExerciseRunnerEvent;
 use PhpSchool\PhpWorkshop\Exercise\ProvidesSolution;
+use Psr\Log\LoggerInterface;
 use RuntimeException;
 
 /**
@@ -20,17 +21,31 @@ class CodePatchListener
      */
     private $codePatcher;
 
+    /**
+     * @var LoggerInterface
+     */
+    private $logger;
+
+    /**
+     * @var bool
+     */
+    private $debugMode;
+
     /**
      * @var array<string, string>
      */
     private $originalCode = [];
 
     /**
      * @param CodePatcher $codePatcher
+     * @param LoggerInterface $logger
+     * @param bool $debugMode
      */
-    public function __construct(CodePatcher $codePatcher)
+    public function __construct(CodePatcher $codePatcher, LoggerInterface $logger, bool $debugMode)
     {
         $this->codePatcher = $codePatcher;
+        $this->logger = $logger;
+        $this->debugMode = $debugMode;
     }
 
     /**
@@ -46,6 +61,8 @@ public function patch(ExerciseRunnerEvent $event): void
         }
 
         foreach (array_filter($files) as $fileName) {
+            $this->logger->debug("Patching file: $fileName");
+
             $this->originalCode[$fileName] = (string) file_get_contents($fileName);
 
             file_put_contents(
@@ -64,6 +81,11 @@ public function revert(EventInterface $event): void
             return;
         }
 
+        //if we're in debug mode leave the students patch for debugging
+        if ($event instanceof ExerciseRunnerEvent && $this->debugMode) {
+            unset($this->originalCode[$event->getInput()->getArgument('program')]);
+        }
+
         foreach ($this->originalCode as $fileName => $contents) {
             file_put_contents($fileName, $contents);
         }

src/TestUtils/WorkshopExerciseTest.php

@@ -23,6 +23,7 @@
 use PhpSchool\PhpWorkshop\ResultAggregator;
 use PhpSchool\PhpWorkshop\Utils\ArrayObject;
 use PhpSchool\PhpWorkshop\Utils\Collection;
+use PhpSchool\PhpWorkshop\Utils\System;
 use PHPUnit\Framework\ExpectationFailedException;
 use PHPUnit\Framework\TestCase;
 use Psr\Container\ContainerInterface;
@@ -53,6 +54,11 @@ public function setUp(): void
         $this->container = $this->app->configure();
     }
 
+    public function tearDown(): void
+    {
+        (new Filesystem())->remove(System::tempDir());
+    }
+
     /**
      * @return class-string
      */

test/Listener/CodePatchListenerTest.php

@@ -10,6 +10,8 @@
 use PhpSchool\PhpWorkshop\Utils\System;
 use PhpSchool\PhpWorkshopTest\Asset\ProvidesSolutionExercise;
 use PHPUnit\Framework\TestCase;
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
 use Symfony\Component\Filesystem\Filesystem;
 
 class CodePatchListenerTest extends TestCase
@@ -47,6 +49,11 @@ public function setUp(): void
         touch($this->solution);
     }
 
+    public function tearDown(): void
+    {
+        $this->filesystem->remove(dirname($this->file));
+    }
+
     public function testPatchUpdatesCode(): void
     {
         file_put_contents($this->file, 'ORIGINAL CONTENT');
@@ -60,7 +67,7 @@ public function testPatchUpdatesCode(): void
             ->with($exercise, 'ORIGINAL CONTENT')
             ->willReturn('MODIFIED CONTENT');
 
-        $listener   = new CodePatchListener($this->codePatcher);
+        $listener   = new CodePatchListener($this->codePatcher, new NullLogger(), false);
         $event      = new ExerciseRunnerEvent('event', $exercise, $input);
         $listener->patch($event);
 
@@ -80,7 +87,7 @@ public function testRevertAfterPatch(): void
             ->with($exercise, 'ORIGINAL CONTENT')
             ->willReturn('MODIFIED CONTENT');
 
-        $listener   = new CodePatchListener($this->codePatcher);
+        $listener   = new CodePatchListener($this->codePatcher, new NullLogger(), false);
         $event      = new ExerciseRunnerEvent('event', $exercise, $input);
         $listener->patch($event);
         $listener->revert($event);
@@ -101,16 +108,55 @@ public function testPatchesProvidedSolution(): void
             ->withConsecutive([$exercise, 'ORIGINAL CONTENT'], [$exercise, "<?php\n\necho 'Hello World';\n"])
             ->willReturn('MODIFIED CONTENT');
 
-        $listener   = new CodePatchListener($this->codePatcher);
+        $listener   = new CodePatchListener($this->codePatcher, new NullLogger(), false);
         $event      = new ExerciseRunnerEvent('event', $exercise, $input);
         $listener->patch($event);
 
         self::assertStringEqualsFile($this->file, 'MODIFIED CONTENT');
         self::assertStringEqualsFile($exercise->getSolution()->getEntryPoint(), 'MODIFIED CONTENT');
     }
 
-    public function tearDown(): void
+    public function testFileIsLoggedWhenPatches(): void
     {
-        $this->filesystem->remove(dirname($this->file));
+        file_put_contents($this->file, 'ORIGINAL CONTENT');
+
+        $input    = new Input('app', ['program' => $this->file]);
+        $exercise = $this->createMock(ExerciseInterface::class);
+
+        $this->codePatcher
+            ->expects($this->once())
+            ->method('patch')
+            ->with($exercise, 'ORIGINAL CONTENT')
+            ->willReturn('MODIFIED CONTENT');
+
+        $logger = $this->createMock(LoggerInterface::class);
+        $logger->expects($this->once())
+            ->method('debug')
+            ->with('Patching file: ' . $this->file);
+
+        $listener  = new CodePatchListener($this->codePatcher, $logger, false);
+        $event      = new ExerciseRunnerEvent('event', $exercise, $input);
+        $listener->patch($event);
+    }
+
+    public function testRevertDoesNotRevertStudentSubmissionPatchIfInDebugMode(): void
+    {
+        file_put_contents($this->file, 'ORIGINAL CONTENT');
+
+        $input    = new Input('app', ['program' => $this->file]);
+        $exercise = $this->createMock(ExerciseInterface::class);
+
+        $this->codePatcher
+            ->expects($this->once())
+            ->method('patch')
+            ->with($exercise, 'ORIGINAL CONTENT')
+            ->willReturn('MODIFIED CONTENT');
+
+        $listener   = new CodePatchListener($this->codePatcher, new NullLogger(), true);
+        $event      = new ExerciseRunnerEvent('event', $exercise, $input);
+        $listener->patch($event);
+        $listener->revert($event);
+
+        self::assertStringEqualsFile($this->file, 'MODIFIED CONTENT');
     }
 }