Add NullLogger (#116)

Author: theofidry

src/Logger/NullLogger.php

@@ -0,0 +1,66 @@
+<?php
+
+/*
+ * This file is part of the Webmozarts Console Parallelization package.
+ *
+ * (c) Webmozarts GmbH <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Webmozarts\Console\Parallelization\Logger;
+
+use Throwable;
+
+final class NullLogger implements Logger
+{
+    public function logConfiguration(
+        int $segmentSize,
+        int $batchSize,
+        int $numberOfItems,
+        int $numberOfSegments,
+        int $numberOfBatches,
+        int $numberOfProcesses,
+        string $itemName
+    ): void {
+        // Do nothing.
+    }
+
+    public function startProgress(int $numberOfItems): void
+    {
+        // Do nothing.
+    }
+
+    public function advance(int $steps = 1): void
+    {
+        // Do nothing.
+    }
+
+    public function finish(string $itemName): void
+    {
+        // Do nothing.
+    }
+
+    public function logUnexpectedOutput(string $buffer, string $progressSymbol): void
+    {
+        // Do nothing.
+    }
+
+    public function logCommandStarted(string $commandName): void
+    {
+        // Do nothing.
+    }
+
+    public function logCommandFinished(): void
+    {
+        // Do nothing.
+    }
+
+    public function logItemProcessingFailed(string $item, Throwable $throwable): void
+    {
+        // Do nothing.
+    }
+}

src/Logger/ProgressBarFactory.php

@@ -19,6 +19,8 @@
 interface ProgressBarFactory
 {
     /**
+     * Creates a started progress bar.
+     *
      * @param 0|positive-int $numberOfItems
      */
     public function create(