X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/a2b5ba2a3a97eb3a0b5130a5b317bb750c1624cf..548d6991610ae547b34e6c3058fc8299c9b25658:/src/black/__init__.py

diff --git a/src/black/__init__.py b/src/black/__init__.py
index a985926..51384fb 100644
--- a/src/black/__init__.py
+++ b/src/black/__init__.py
@@ -328,6 +328,7 @@ def validate_regex(
         exists=True, file_okay=True, dir_okay=True, readable=True, allow_dash=True
     ),
     is_eager=True,
+    metavar="SRC ...",
 )
 @click.option(
     "--config",
@@ -803,7 +804,8 @@ def format_stdin_to_stdout(
         )
         if write_back == WriteBack.YES:
             # Make sure there's a newline after the content
-            dst += "" if dst[-1] == "\n" else "\n"
+            if dst and dst[-1] != "\n":
+                dst += "\n"
             f.write(dst)
         elif write_back in (WriteBack.DIFF, WriteBack.COLOR_DIFF):
             now = datetime.utcnow()