Support .toml configuration format with --config flag (#249)

* Support .toml configuration format with --config flag

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

autoflake.py

@@ -1194,7 +1194,11 @@ def merge_configuration_file(flag_args):
 
     if "config_file" in flag_args:
         config_file = pathlib.Path(flag_args["config_file"]).resolve()
-        config = process_config_file(config_file)
+
+        if config_file.suffix == ".toml":
+            config = process_pyproject_toml(config_file)
+        else:
+            config = process_config_file(config_file)
 
         if not config:
             _LOGGER.error(

test_autoflake.py

@@ -3385,6 +3385,32 @@ def test_config_option(self):
                 check=True,
             )
 
+    def test_config_option_toml(self):
+        with temporary_file(
+            suffix=".toml",
+            contents=(
+                "[tool.autoflake]\n"
+                "check = true\n"
+                'exclude = [\n  "build",\n  ".venv",\n]'
+            ),
+        ) as temp_config:
+            self.create_file("test_me.py")
+            files = [self.effective_path("test_me.py")]
+
+            args, success = autoflake.merge_configuration_file(
+                {
+                    "files": files,
+                    "config_file": temp_config,
+                },
+            )
+            assert success is True
+            assert args == self.with_defaults(
+                files=files,
+                config_file=temp_config,
+                check=True,
+                exclude="build,.venv",
+            )
+
     def test_load_false(self):
         self.create_file("test_me.py")
         self.create_file(