From c4e1cf610157905466dda86602456c99e5172bb4 Mon Sep 17 00:00:00 2001
From: teramako <teramako@gmail.com>
Date: Sun, 31 Aug 2025 03:16:31 +0900
Subject: [PATCH] Fix file writing mode in WriteToFile method when overwriting

When overwriting existing content, old data remains without Truncate mode
---
 src/MamlWriter/MamlHelpers.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/MamlWriter/MamlHelpers.cs b/src/MamlWriter/MamlHelpers.cs
index bc9025d7..399bd8fa 100644
--- a/src/MamlWriter/MamlHelpers.cs
+++ b/src/MamlWriter/MamlHelpers.cs
@@ -24,7 +24,8 @@ public class MamlConversionHelper
         public static FileInfo WriteToFile(HelpItems helpItems, string path, Encoding encoding)
         {
             var outputFile = new FileInfo(path);
-            using(var writer = new StreamWriter(new FileStream(outputFile.FullName, FileMode.OpenOrCreate, FileAccess.ReadWrite), encoding))
+            using(var fs = new FileStream(outputFile.FullName, outputFile.Exists ? FileMode.Truncate : FileMode.OpenOrCreate, FileAccess.ReadWrite))
+            using(var writer = new StreamWriter(fs, encoding))
             {
                 helpItems.WriteTo(writer);
             }