Use ruff for code checking and linting

`isort` is failing in pre-commit.ci right now, so this might be good
timing.

See: https://whynothugo.nl/journal/2023/01/20/notes-on-ruff/

.pre-commit-config.yaml

@@ -8,26 +8,10 @@ repos:
       - id: check-toml
       - id: check-added-large-files
       - id: debug-statements
-  - repo: https://github.com/PyCQA/flake8
-    rev: "6.0.0"
-    hooks:
-      - id: flake8
-        additional_dependencies:
-          - flake8-bugbear
   - repo: https://github.com/psf/black
     rev: "22.10.0"
     hooks:
       - id: black
-  - repo: https://github.com/pycqa/isort
-    rev: 5.10.1
-    hooks:
-      - id: isort
-        name: isort (python)
-  - repo: https://github.com/asottile/pyupgrade
-    rev: v3.3.0
-    hooks:
-    -   id: pyupgrade
-        args: [--py37-plus]
   - repo: https://github.com/pre-commit/mirrors-mypy
     rev: "v0.991"
     hooks:
@@ -38,3 +22,7 @@ repos:
           - types-docutils
           - types-requests
           - types-atomicwrites
+  - repo: https://github.com/charliermarsh/ruff-pre-commit
+    rev: 'v0.0.237'
+    hooks:
+      - id: ruff

docs/contributing.rst

@@ -81,7 +81,7 @@ virtualenv_ and run this inside of it::
 
     # Install development dependencies, including:
     #  - vdirsyncer from the repo into the virtualenv
-    #  - stylecheckers (flake8) and code formatters (autopep8)
+    #  - stylecheckers (ruff) and code formatters (black)
     make install-dev
 
     # Install git commit hook for some extra linting and checking

pyproject.toml

@@ -0,0 +1,15 @@
+[tool.ruff]
+select = [
+    "E",
+    "F",
+    "W",
+    "B0",
+    "I",
+    "UP",
+    "C4",
+    # "TID",
+]
+target-version = "py37"
+
+[tool.ruff.isort]
+force-single-line = true

setup.cfg

@@ -8,21 +8,6 @@ addopts =
   --color=yes
 # filterwarnings=error
 
-[flake8]
-application-import-names = tests,vdirsyncer
-extend-ignore =
-  # Black-incompatible colon spacing.
-  E203,
-  # Line jump before binary operator.
-  W503,
-  I100,
-  I202
-max-line-length = 88
-exclude = .eggs,build
-
-[isort]
-force_single_line=true
-
 [mypy]
 ignore_missing_imports = True
 # See https://github.com/python/mypy/issues/7511: