Patch-Source: https://github.com/python-lsp/python-lsp-black/pull/40
--
From 80d34ca4f35baa654e5f1fee7860214950f1ae37 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20G=C3=B3rny?= <mgorny@gentoo.org>
Date: Thu, 26 Jan 2023 12:07:11 +0100
Subject: [PATCH] Replace the obsolete toml package with tomllib/tomli

Use the modern `tomllib` module (in Python 3.11+) or its drop-in
replacement `tomli` (for older Python versions) instead of the obsolete
`toml` module.  The latter is unmaintained and does not support TOML
1.0.
---
 .pre-commit-config.yaml |  2 +-
 pylsp_black/plugin.py   | 12 +++++++++---
 setup.cfg               |  7 +++++--
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/pylsp_black/plugin.py b/pylsp_black/plugin.py
index abc4277..08cf4da 100644
--- a/pylsp_black/plugin.py
+++ b/pylsp_black/plugin.py
@@ -1,15 +1,20 @@
 import logging
 import os
+import sys
 from functools import lru_cache
 from pathlib import Path
 from typing import Dict, Optional
 
 import black
-import toml
 from pylsp import hookimpl
 from pylsp._utils import get_eol_chars
 from pylsp.config.config import Config
 
+if sys.version_info >= (3, 11):
+    import tomllib
+else:
+    import tomli as tomllib
+
 logger = logging.getLogger(__name__)
 
 
@@ -152,8 +157,9 @@ def _load_config(filename: str, client_config: Config) -> Dict:
             return defaults
 
     try:
-        pyproject_toml = toml.load(str(pyproject_filename))
-    except (toml.TomlDecodeError, OSError):
+        with open(pyproject_filename, "rb") as f:
+            pyproject_toml = tomllib.load(f)
+    except (tomllib.TOMLDecodeError, OSError):
         logger.warning(
             "Error decoding pyproject.toml, using defaults: %r",
             defaults,
diff --git a/setup.cfg b/setup.cfg
index 533d842..87be79a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -18,14 +18,17 @@ classifiers =
 
 [options]
 packages = find:
-install_requires = python-lsp-server>=1.4.0; black>=22.3.0; toml
+install_requires =
+    python-lsp-server>=1.4.0
+    black>=22.3.0
+    tomli; python_version<'3.11'
 python_requires = >= 3.7
 
 [options.entry_points]
 pylsp = pylsp_black = pylsp_black.plugin
 
 [options.extras_require]
-dev = isort>=5.0; flake8; pre-commit; pytest; mypy; pytest; types-pkg_resources; types-setuptools; types-toml
+dev = isort>=5.0; flake8; pre-commit; pytest; mypy; pytest; types-pkg_resources; types-setuptools
 
 [flake8]
 max-line-length = 88