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blackd: fix mishandling of single character input (#3558)
[etc/vim.git] / src / blackd / __init__.py
diff --git a/src/blackd/__init__.py b/src/blackd/__init__.py
index 4f2d87d0fca2bb310275c8c0a27bf160f69098df..6b0f3d33295163a2810676d773ed2ee35691be3f 100644 (file)
--- a/src/blackd/__init__.py
+++ b/src/blackd/__init__.py
@@ -152,7 +152,8 @@ async def handle(request: web.Request, executor: Executor) -> web.Response:
         )
 
         # Preserve CRLF line endings
-        if req_str[req_str.find("\n") - 1] == "\r":
+        nl = req_str.find("\n")
+        if nl > 0 and req_str[nl - 1] == "\r":
             formatted_str = formatted_str.replace("\n", "\r\n")
             # If, after swapping line endings, nothing changed, then say so
             if formatted_str == req_str:
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