From c22202585d46b13e6e1a980e7f19365358bd214c Mon Sep 17 00:00:00 2001
From: "Paul Gauthier (aider)" <paul@aider.chat>
Date: Mon, 13 Jan 2025 09:35:01 -0800
Subject: [PATCH] fix: validate line_endings parameter in InputOutput
 initialization

---
 aider/io.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/aider/io.py b/aider/io.py
index b79b0e63c..140847c9e 100644
--- a/aider/io.py
+++ b/aider/io.py
@@ -245,6 +245,12 @@ class InputOutput:
             self.chat_history_file = None
 
         self.encoding = encoding
+        valid_line_endings = {"platform", "lf", "crlf"}
+        if line_endings not in valid_line_endings:
+            raise ValueError(
+                f"Invalid line_endings value: {line_endings}. "
+                f"Must be one of: {', '.join(valid_line_endings)}"
+            )
         self.newline = None if line_endings == "platform" \
             else "\n" if line_endings == "lf" else "\r\n"
         self.dry_run = dry_run