From fe22f6d8f2d51e12d19994ec1c2d0ac62026cabb Mon Sep 17 00:00:00 2001
From: Alexander Schnitzler <git@alexanderschnitzler.de>
Date: Thu, 18 Jun 2026 11:42:27 +0200
Subject: [PATCH] [BUGFIX] Replace usage of UnifiedDiffOutputBuilder with
 StrictUnifiedDiffOutputBuilder

Resolves: #408
---
 .../src/Differ/DifferFactory.php                      | 11 ++---------
 .../src/Printer/Markdown/MarkdownDiffer.php           |  3 +--
 packages/fractor/src/Differ/ConsoleDiffer.php         |  7 +++++--
 3 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/packages/fractor-doc-generator/src/Differ/DifferFactory.php b/packages/fractor-doc-generator/src/Differ/DifferFactory.php
index 840fbfb0..ccca8579 100644
--- a/packages/fractor-doc-generator/src/Differ/DifferFactory.php
+++ b/packages/fractor-doc-generator/src/Differ/DifferFactory.php
@@ -4,20 +4,13 @@
 
 namespace a9f\FractorDocGenerator\Differ;
 
-use ReflectionProperty;
 use SebastianBergmann\Diff\Differ;
-use SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder;
+use SebastianBergmann\Diff\Output\DiffOnlyOutputBuilder;
 
 final class DifferFactory
 {
     public static function create(): Differ
     {
-        $unifiedDiffOutputBuilder = new UnifiedDiffOutputBuilder('');
-
-        // this is required to show full diffs from start to end
-        $contextLinesReflectionProperty = new ReflectionProperty($unifiedDiffOutputBuilder, 'contextLines');
-        $contextLinesReflectionProperty->setValue($unifiedDiffOutputBuilder, 10000);
-
-        return new Differ($unifiedDiffOutputBuilder);
+        return new Differ(new DiffOnlyOutputBuilder(''));
     }
 }
diff --git a/packages/fractor-doc-generator/src/Printer/Markdown/MarkdownDiffer.php b/packages/fractor-doc-generator/src/Printer/Markdown/MarkdownDiffer.php
index c417f0de..6efba47f 100644
--- a/packages/fractor-doc-generator/src/Printer/Markdown/MarkdownDiffer.php
+++ b/packages/fractor-doc-generator/src/Printer/Markdown/MarkdownDiffer.php
@@ -33,14 +33,13 @@ public function diff(string $old, string $new): string
         }
 
         $diff = $this->differ->diff($old, $new);
-        $diff = $this->clearUnifiedDiffOutputFirstLine($diff);
         $diff = $this->removeTrailingWhitespaces($diff);
 
         return $this->warpToDiffCode($diff);
     }
 
     /**
-     * Removes UnifiedDiffOutputBuilder generated pre-spaces " \n" => "\n"
+     * Removes StrictUnifiedDiffOutputBuilder generated pre-spaces " \n" => "\n"
      */
     private function removeTrailingWhitespaces(string $diff): string
     {
diff --git a/packages/fractor/src/Differ/ConsoleDiffer.php b/packages/fractor/src/Differ/ConsoleDiffer.php
index d5763fc9..ae170465 100644
--- a/packages/fractor/src/Differ/ConsoleDiffer.php
+++ b/packages/fractor/src/Differ/ConsoleDiffer.php
@@ -8,7 +8,7 @@
 use a9f\Fractor\Differ\Formatter\ColorConsoleDiffFormatter;
 use a9f\Fractor\Differ\ValueObject\Diff;
 use SebastianBergmann\Diff\Differ as CoreDiffer;
-use SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder;
+use SebastianBergmann\Diff\Output\StrictUnifiedDiffOutputBuilder;
 
 final readonly class ConsoleDiffer implements Differ
 {
@@ -17,7 +17,10 @@
     public function __construct(
         private ColorConsoleDiffFormatter $colorConsoleDiffFormatter
     ) {
-        $unifiedDiffOutputBuilder = new UnifiedDiffOutputBuilder();
+        $unifiedDiffOutputBuilder = new StrictUnifiedDiffOutputBuilder([
+            'fromFile' => '',
+            'toFile' => '',
+        ]);
         $this->differ = new CoreDiffer($unifiedDiffOutputBuilder);
     }