add UnifiedDiffOutputBuilder with full context

packages/ConsoleDiffer/src/Diff/Output/CompleteUnifiedDiffOutputBuilderFactory.php

@@ -0,0 +1,31 @@
+<?php declare(strict_types=1);
+
+namespace Rector\ConsoleDiffer\Diff\Output;
+
+use SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder;
+use Symplify\PackageBuilder\Reflection\PrivatesAccessor;
+
+/**
+ * Creates @see UnifiedDiffOutputBuilder with "$contextLines = 1000;"
+ */
+final class CompleteUnifiedDiffOutputBuilderFactory
+{
+    /**
+     * @var PrivatesAccessor
+     */
+    private $privatesAccessor;
+
+    public function __construct()
+    {
+        $this->privatesAccessor = new PrivatesAccessor();
+    }
+
+    public function create(): UnifiedDiffOutputBuilder
+    {
+        $unifiedDiffOutputBuilder = new UnifiedDiffOutputBuilder('');
+
+        $this->privatesAccessor->setPrivateProperty($unifiedDiffOutputBuilder, 'contextLines', 1000);
+
+        return $unifiedDiffOutputBuilder;
+    }
+}

packages/ConsoleDiffer/src/MarkdownDifferAndFormatter.php

@@ -42,20 +42,21 @@ final class MarkdownDifferAndFormatter
             return '';
         }
 
-        // @todo here we need complete diff with all the code
         $diff = $this->markdownDiffer->diff($old, $new);
 
+        // remove first 3 lines, just meta info added by StrictUnifiedDiffOutputBuilder
+        $diff = preg_replace("/^(.*\n){1}/", "", $diff);
+
         $diff = $this->removeTrailingWhitespaces($diff);
 
-        // impossible to configure - removed manually
-        return substr($diff, strlen('@@ @@ '));
+        return $diff;
     }
 
     private function removeTrailingWhitespaces(string $diff): string
     {
-        $diff = preg_replace('#\n( )\n#', PHP_EOL . PHP_EOL, $diff);
+        $diff = preg_replace('#\n( ){1,}\n#', PHP_EOL . PHP_EOL, $diff);
 
-        $diff = preg_replace('#( )\n#', PHP_EOL, $diff);
+        $diff = preg_replace('#( ){1,}\n#', PHP_EOL, $diff);
 
         return rtrim($diff);
     }

packages/ConsoleDiffer/src/config/external-services.yml

@@ -15,8 +15,7 @@ services:
     # makrdown differ
     markdownDiffOutputBuilder:
         class: SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder
-        arguments:
-            $header: ''
+        factory: ['@Rector\ConsoleDiffer\Diff\Output\CompleteUnifiedDiffOutputBuilderFactory', 'create']
 
     markdownDiffer:
         class: SebastianBergmann\Diff\Differ