Allow clients to configure the preview option

This was added in Black 22.1.0

Author: ccordoba12

pylsp_black/plugin.py

@@ -115,6 +115,7 @@ def _load_config(filename: str, client_config: Config) -> Dict:
         "pyi": filename.endswith(".pyi"),
         "skip_string_normalization": False,
         "target_version": set(),
+        "preview": settings.get("preview", False),
     }
 
     root = black.find_project_root((filename,))

setup.cfg

@@ -18,7 +18,7 @@ classifiers =
 
 [options]
 packages = find:
-install_requires = python-lsp-server>=1.4.0; black>=19.3b0; toml
+install_requires = python-lsp-server>=1.4.0; black>=22.1.0; toml
 python_requires = >= 3.7
 
 [options.entry_points]

tests/test_plugin.py

@@ -234,6 +234,7 @@ def test_load_config(config):
         "pyi": True,
         "fast": True,
         "skip_string_normalization": True,
+        "preview": False,
     }
 
 
@@ -264,6 +265,7 @@ def test_load_config_defaults(config):
         "pyi": False,
         "fast": False,
         "skip_string_normalization": False,
+        "preview": False,
     }