feat(yaml_config): add explicit_start for yaml output

generate cz.yaml that comply yamllint

Author: Lee-W

commitizen/config/yaml_config.py

@@ -17,7 +17,7 @@ def __init__(self, *, data: Union[bytes, str], path: Union[Path, str]):
 
     def init_empty_config_content(self):
         with smart_open(self.path, "a") as json_file:
-            yaml.dump({"commitizen": {}}, json_file)
+            yaml.dump({"commitizen": {}}, json_file, explicit_start=True)
 
     def _parse_setting(self, data: Union[bytes, str]) -> None:
         """We expect to have a section in cz.yaml looking like
@@ -44,6 +44,6 @@ def set_key(self, key, value):
 
         parser["commitizen"][key] = value
         with smart_open(self.path, "w") as yaml_file:
-            yaml.dump(parser, yaml_file)
+            yaml.dump(parser, yaml_file, explicit_start=True)
 
         return self

tests/test_conf.py

@@ -160,3 +160,13 @@ def test_init_empty_config_content(self, tmpdir):
 
         with open(path, "r") as json_file:
             assert json.load(json_file) == {"commitizen": {}}
+
+
+class TestYamlConfig:
+    def test_init_empty_config_content(self, tmpdir):
+        path = tmpdir.mkdir("commitizen").join(".cz.yaml")
+        yaml_config = config.YAMLConfig(data="{}", path=path)
+        yaml_config.init_empty_config_content()
+
+        with open(path, "r") as yaml_file:
+            assert yaml.safe_load(yaml_file) == {"commitizen": {}}