Don't override TOML paths with empty CLI paths

CHANGELOG.md

@@ -1,6 +1,7 @@
 # unreleased
 
 * Only parse format strings when being used with `locals()` (jingw, #225).
+* Don't override paths in pyproject.toml with empty CLI paths (bcbnz, #228).
 
 # 2.1 (2020-08-19)
 

tests/test_config.py

@@ -147,6 +147,27 @@ def test_config_merging_missing():
     assert result["ignore_names"] == ["name1"]
 
 
+def test_config_merging_toml_paths_only():
+    """
+    If we have paths in the TOML but not on the CLI, the TOML paths should be
+    used.
+    """
+    toml = StringIO(
+        dedent(
+            """\
+        [tool.vulture]
+        paths = ["path1", "path2"]
+        """
+        )
+    )
+    cliargs = [
+        "--exclude=test_*.py",
+    ]
+    result = make_config(cliargs, toml)
+    assert result["paths"] == ["path1", "path2"]
+    assert result["exclude"] == ["test_*.py"]
+
+
 def test_invalid_config_options_output():
     """
     If the config file contains unknown options we want to abort.

vulture/config.py

@@ -100,6 +100,7 @@ def csv(exclude):
         "paths",
         nargs="*",
         metavar="PATH",
+        default=missing,
         help="Paths may be Python files or directories. For each directory"
         " Vulture analyzes all contained *.py files.",
     )