From 01d020690e74820be652ad6fbaa8f8e7cf5cb6bc Mon Sep 17 00:00:00 2001
From: Olga Mokshantseva <mokshano@oregonstate.edu>
Date: Fri, 30 May 2025 08:42:40 -0700
Subject: [PATCH] [Feature request] Auto insert new line at eof #1412

---
 src/Notepads/Controls/TextEditor/TextEditor.xaml.cs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/Notepads/Controls/TextEditor/TextEditor.xaml.cs b/src/Notepads/Controls/TextEditor/TextEditor.xaml.cs
index dd30c6a90..c0df0451c 100644
--- a/src/Notepads/Controls/TextEditor/TextEditor.xaml.cs
+++ b/src/Notepads/Controls/TextEditor/TextEditor.xaml.cs
@@ -723,11 +723,23 @@ private async Task<TextFile> SaveContentToFileAsync(StorageFile file)
             var text = TextEditorCore.GetText();
             var encoding = RequestedEncoding ?? LastSavedSnapshot.Encoding;
             var lineEnding = RequestedLineEnding ?? LastSavedSnapshot.LineEnding;
+            text = EnsureEndsWithLineEnding(text);
             await FileSystemUtility.WriteTextToFileAsync(file, LineEndingUtility.ApplyLineEnding(text, lineEnding), encoding); // Will throw if not succeeded
             var newFileModifiedTime = await FileSystemUtility.GetDateModifiedAsync(file);
             return new TextFile(text, encoding, lineEnding, newFileModifiedTime);
         }
 
+        private string EnsureEndsWithLineEnding(string text)
+        {
+            if (string.IsNullOrEmpty(text)) return text;
+            if (!text.EndsWith("\n") && !text.EndsWith("\r"))
+            {
+                var effectiveLineEnding = RequestedLineEnding ?? LastSavedSnapshot.LineEnding;
+                return text + LineEndingUtility.GetLineEndingName(effectiveLineEnding);
+            }
+            return text;
+        }
+
         public string GetContentForSharing()
         {
             return TextEditorCore.Document.Selection.StartPosition == TextEditorCore.Document.Selection.EndPosition ?