diff --git a/mypy/config_parser.py b/mypy/config_parser.py
index 0e033471d2e9..35720b8580d0 100644
--- a/mypy/config_parser.py
+++ b/mypy/config_parser.py
@@ -109,6 +109,9 @@ def split_and_match_files_list(paths: Sequence[str]) -> list[str]:
expanded_paths = []
for path in paths:
+ if not path:
+ continue
+
path = expand_path(path.strip())
globbed_files = fileglob.glob(path, recursive=True)
if globbed_files:
@@ -318,6 +321,23 @@ def parse_config_file(
print(f"{file_read}: No [mypy] section in config file", file=stderr)
else:
section = parser["mypy"]
+
+ if "files" in section:
+ raw_files = section["files"].strip()
+ files_split = [file.strip() for file in raw_files.split(",")]
+
+ # Remove trailing empty entry if present
+ if files_split and files_split[-1] == "":
+ files_split.pop()
+
+ # Raise an error if there are any remaining empty strings
+ if "" in files_split:
+ raise ValueError(
+ "Invalid config: Empty filenames are not allowed except for trailing commas."
+ )
+
+ options.files = files_split
+
prefix = f"{file_read}: [mypy]: "
updates, report_dirs = parse_section(
prefix, options, set_strict_flags, section, config_types, stderr
diff --git a/mypy/test/testconfigparser.py b/mypy/test/testconfigparser.py
new file mode 100644
index 000000000000..ebb45fee377d
--- /dev/null
+++ b/mypy/test/testconfigparser.py
@@ -0,0 +1,168 @@
+import os
+import tempfile
+from unittest import TestCase, main
+
+from mypy.config_parser import parse_config_file
+from mypy.options import Options
+
+
+class TestConfigParser(TestCase):
+ def test_parse_config_file_with_single_file(self) -> None:
+ """A single file should be correctly parsed."""
+ with tempfile.TemporaryDirectory() as tmpdirname:
+ config_path = os.path.join(tmpdirname, "test_config.ini")
+
+ with open(config_path, "w") as f:
+ f.write(
+ """
+ [mypy]
+ files = file1.py
+ """
+ )
+
+ options = Options()
+
+ parse_config_file(options, lambda: None, config_path, stdout=None, stderr=None)
+
+ self.assertEqual(options.files, ["file1.py"])
+
+ def test_parse_config_file_with_no_spaces(self) -> None:
+ """Files listed without spaces should be correctly parsed."""
+ with tempfile.TemporaryDirectory() as tmpdirname:
+ config_path = os.path.join(tmpdirname, "test_config.ini")
+
+ with open(config_path, "w") as f:
+ f.write(
+ """
+ [mypy]
+ files =file1.py,file2.py,file3.py
+ """
+ )
+
+ options = Options()
+
+ parse_config_file(options, lambda: None, config_path, stdout=None, stderr=None)
+
+ self.assertEqual(options.files, ["file1.py", "file2.py", "file3.py"])
+
+ def test_parse_config_file_with_extra_spaces(self) -> None:
+ """Files with extra spaces should be correctly parsed."""
+ with tempfile.TemporaryDirectory() as tmpdirname:
+ config_path = os.path.join(tmpdirname, "test_config.ini")
+
+ with open(config_path, "w") as f:
+ f.write(
+ """
+ [mypy]
+ files = file1.py , file2.py , file3.py
+ """
+ )
+
+ options = Options()
+
+ parse_config_file(options, lambda: None, config_path, stdout=None, stderr=None)
+
+ self.assertEqual(options.files, ["file1.py", "file2.py", "file3.py"])
+
+ def test_parse_config_file_with_empty_files_key(self) -> None:
+ """An empty files key should result in an empty list."""
+ with tempfile.TemporaryDirectory() as tmpdirname:
+ config_path = os.path.join(tmpdirname, "test_config.ini")
+
+ with open(config_path, "w") as f:
+ f.write(
+ """
+ [mypy]
+ files =
+ """
+ )
+
+ options = Options()
+
+ parse_config_file(options, lambda: None, config_path, stdout=None, stderr=None)
+
+ self.assertEqual(options.files, [])
+
+ def test_parse_config_file_with_only_comma(self) -> None:
+ """A files key with only a comma should raise an error."""
+ with tempfile.TemporaryDirectory() as tmpdirname:
+ config_path = os.path.join(tmpdirname, "test_config.ini")
+
+ with open(config_path, "w") as f:
+ f.write(
+ """
+ [mypy]
+ files = ,
+ """
+ )
+
+ options = Options()
+
+ with self.assertRaises(ValueError) as cm:
+ parse_config_file(options, lambda: None, config_path, stdout=None, stderr=None)
+
+ self.assertIn("Invalid config", str(cm.exception))
+
+ def test_parse_config_file_with_only_whitespace(self) -> None:
+ """A files key with only whitespace should result in an empty list."""
+ with tempfile.TemporaryDirectory() as tmpdirname:
+ config_path = os.path.join(tmpdirname, "test_config.ini")
+
+ with open(config_path, "w") as f:
+ f.write(
+ """
+ [mypy]
+ files =
+ """
+ )
+
+ options = Options()
+
+ parse_config_file(options, lambda: None, config_path, stdout=None, stderr=None)
+
+ self.assertEqual(options.files, [])
+
+ def test_parse_config_file_with_mixed_valid_and_invalid_entries(self) -> None:
+ """Mix of valid and invalid filenames should raise an error."""
+ with tempfile.TemporaryDirectory() as tmpdirname:
+ config_path = os.path.join(tmpdirname, "test_config.ini")
+
+ with open(config_path, "w") as f:
+ f.write(
+ """
+ [mypy]
+ files = file1.py, , , file2.py
+ """
+ )
+
+ options = Options()
+
+ with self.assertRaises(ValueError) as cm:
+ parse_config_file(options, lambda: None, config_path, stdout=None, stderr=None)
+
+ self.assertIn("Invalid config", str(cm.exception))
+
+ def test_parse_config_file_with_newlines_between_files(self) -> None:
+ """Newlines between file entries should be correctly handled."""
+ with tempfile.TemporaryDirectory() as tmpdirname:
+ config_path = os.path.join(tmpdirname, "test_config.ini")
+
+ with open(config_path, "w") as f:
+ f.write(
+ """
+ [mypy]
+ files = file1.py,
+ file2.py,
+ file3.py
+ """
+ )
+
+ options = Options()
+
+ parse_config_file(options, lambda: None, config_path, stdout=None, stderr=None)
+
+ self.assertEqual(options.files, ["file1.py", "file2.py", "file3.py"])
+
+
+if __name__ == "__main__":
+ main()