fixed toml parser ignoring style

pydocstringformatter/_configuration/toml_parsing.py

@@ -45,11 +45,16 @@ def parse_toml_option(
         if value is True:
             return [action.option_strings[0]]
         return []
-    if isinstance(action, argparse._StoreAction):
+    elif isinstance(action, argparse._StoreAction):
         if isinstance(value, int):
             value = str(value)
         return [action.option_strings[0], value]
-    return []  # pragma: no cover
+    elif isinstance(action, argparse._ExtendAction):
+        if isinstance(value, str):
+            value = str(value)
+        return [action.option_strings[0], value]
+    else:
+        raise NotImplementedError
 
 
 def parse_toml_file(

tests/test_config.py

@@ -62,6 +62,42 @@ def test_valid_toml_two(
     assert not output.err
 
 
+def test_toml_style(
+    capsys: pytest.CaptureFixture[str], monkeypatch: pytest.MonkeyPatch
+) -> None:
+    """Test a correct toml with write = False."""
+    monkeypatch.chdir(CONFIG_DATA / "valid_toml_two")
+    pydocstringformatter.run_docstring_formatter(["test_package"])
+    # I am assuming the default style is "pep257"
+    default_output = capsys.readouterr()
+    assert default_output.out.endswith(
+        '''
+@@ -1,3 +1,2 @@
+-"""
+-A docstring"""
++"""A docstring."""
+
+'''
+    )
+
+    with open("pyproject.toml", "a", encoding="utf8") as file:
+        file.write("style = 'numpydoc'")
+
+    pydocstringformatter.run_docstring_formatter(["test_package"])
+    numpydoc_output = capsys.readouterr()
+
+    assert numpydoc_output.out.endswith(
+        '''
+@@ -1,3 +1,3 @@
++"""A docstring.
+ """
+-A docstring"""
+
+'''
+    )
+    assert not numpydoc_output.err
+
+
 def test_invalid_toml(monkeypatch: pytest.MonkeyPatch) -> None:
     """Test an invalid toml file."""
     monkeypatch.chdir(CONFIG_DATA / "invalid_toml")