replace flake8-eradicate with ruff ... and enable a ton of more lint rules, fixing a couple of them.

.gitignore

@@ -1,3 +1,4 @@
+.ruff_cache
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]

.pre-commit-config.yaml

@@ -73,10 +73,16 @@ repos:
           - id: trailing-whitespace
             args: ['--markdown-linebreak-ext=md,markdown']
 
+    - repo: https://github.com/charliermarsh/ruff-pre-commit
+      rev: v0.0.269
+      hooks:
+          - id: ruff
+
     - repo: https://github.com/PyCQA/flake8
       rev: 6.0.0
       hooks:
           - id: flake8
+            # this doesn't seem to work, pyi files don't get checked with --all-files
             types_or: [python, pyi]
             language_version: python3
             additional_dependencies:
@@ -86,26 +92,14 @@ repos:
                 - flake8-comprehensions
                 - flake8-datetimez
                 - flake8-docstrings
-                - flake8-mutable
-                - flake8-noqa
+                - flake8-mutable # not official supported by ruff
                 - flake8-pie
                 - flake8-pyi
                 - flake8-pytest-style
                 - flake8-return
                 - flake8-simplify
                 - flake8-type-checking
-
-# Pinned to flake8 5.0.4 since flake8-eradicate is not updated to work with flake8 6
-# https://github.com/wemake-services/flake8-eradicate/pull/271
-    - repo: https://github.com/PyCQA/flake8
-      rev: 5.0.4
-      hooks:
-          - id: flake8
-            name: flake8-eradicate
-            args: [--select=E800]
-            language_version: python3
-            additional_dependencies:
-                - flake8-eradicate
+              # all other are
 
     - repo: https://github.com/jumanjihouse/pre-commit-hook-yamlfmt
       rev: 0.2.2

flake8_trio/__init__.py

@@ -312,7 +312,7 @@ def get_matching_codes(
         all_codes: set[str] = {
             err_code
             for err_class in (*ERROR_CLASSES, *ERROR_CLASSES_CST)
-            for err_code in err_class.error_codes.keys()  # type: ignore[attr-defined]
+            for err_code in err_class.error_codes  # type: ignore[attr-defined]
             if len(err_code) == 7  # exclude e.g. TRIO103_anyio_trio
         }
 
@@ -367,7 +367,7 @@ def parse_trio200_dict(raw_value: str) -> dict[str, str]:
             # if we raise it as ValueError
             raise ArgumentTypeError(
                 f"Invalid number ({len(split_values)-1}) of splitter "
-                + f"tokens {splitter!r} in {value!r}"
+                f"tokens {splitter!r} in {value!r}"
             )
         res[split_values[0]] = split_values[1]
     return res

flake8_trio/visitors/flake8triovisitor.py

@@ -153,7 +153,7 @@ def library_str(self) -> str:
 
     def add_library(self, name: str) -> None:
         if name not in self.__state.library:
-            self.__state.library = self.__state.library + (name,)
+            self.__state.library = (*self.__state.library, name)
 
 
 class Flake8TrioVisitor_cst(cst.CSTTransformer, ABC):
@@ -200,8 +200,9 @@ def restore_state(self, node: cst.CSTNode):
     def is_noqa(self, node: cst.CSTNode, code: str):
         if self.options.disable_noqa:
             return False
-        pos = self.get_metadata(PositionProvider, node).start
-        noqas = self.noqas.get(pos.line)
+        # pyright + get_metadata is acting up
+        pos = self.get_metadata(PositionProvider, node).start  # type: ignore
+        noqas = self.noqas.get(pos.line)  # type: ignore
         return noqas is not None and (noqas == set() or code in noqas)
 
     def error(
@@ -223,13 +224,14 @@ def error(
         if self.is_noqa(node, error_code):
             return False
 
-        pos = self.get_metadata(PositionProvider, node).start
+        # pyright + get_metadata is acting up
+        pos = self.get_metadata(PositionProvider, node).start  # type: ignore
         self.__state.problems.append(
             Error(
                 # 7 == len('TRIO...'), so alt messages raise the original code
                 error_code[:7],
-                pos.line,
-                pos.column,
+                pos.line,  # type: ignore
+                pos.column,  # type: ignore
                 self.error_codes[error_code],
                 *args,
             )
@@ -253,4 +255,4 @@ def library(self) -> tuple[str, ...]:
 
     def add_library(self, name: str) -> None:
         if name not in self.__state.library:
-            self.__state.library = self.__state.library + (name,)
+            self.__state.library = (*self.__state.library, name)

flake8_trio/visitors/visitor100.py

@@ -9,7 +9,7 @@
 
 from typing import Any
 
-import libcst as cst
+import libcst as cst  # noqa: TCH002
 import libcst.matchers as m
 
 from .flake8triovisitor import Flake8TrioVisitor_cst

flake8_trio/visitors/visitor91x.py

@@ -284,9 +284,9 @@ def visit_FunctionDef(self, node: cst.FunctionDef) -> bool:
             # this should improve performance on codebases with many sync functions
             return any(m.findall(node, m.FunctionDef(asynchronous=m.Asynchronous())))
 
-        pos = self.get_metadata(PositionProvider, node).start
+        pos = self.get_metadata(PositionProvider, node).start  # type: ignore
         self.uncheckpointed_statements = {
-            Statement("function definition", pos.line, pos.column)
+            Statement("function definition", pos.line, pos.column)  # type: ignore
         }
         return True
 
@@ -419,8 +419,10 @@ def leave_Yield(
             self.add_statement = self.checkpoint_statement()
 
         # mark as requiring checkpoint after
-        pos = self.get_metadata(PositionProvider, original_node).start
-        self.uncheckpointed_statements = {Statement("yield", pos.line, pos.column)}
+        pos = self.get_metadata(PositionProvider, original_node).start  # type: ignore
+        self.uncheckpointed_statements = {
+            Statement("yield", pos.line, pos.column)  # type: ignore
+        }
         # return original to avoid problems with identity equality
         assert original_node.deep_equals(updated_node)
         return original_node
@@ -442,9 +444,9 @@ def visit_Try(self, node: cst.Try):
         )
         # yields inside `try` can always be uncheckpointed
         for inner_node in m.findall(node.body, m.Yield()):
-            pos = self.get_metadata(PositionProvider, inner_node).start
+            pos = self.get_metadata(PositionProvider, inner_node).start  # type: ignore
             self.try_state.body_uncheckpointed_statements.add(
-                Statement("yield", pos.line, pos.column)
+                Statement("yield", pos.line, pos.column)  # type: ignore
             )
 
     def leave_Try_body(self, node: cst.Try):
@@ -657,7 +659,7 @@ def leave_While_orelse(self, node: cst.For | cst.While):
         else:
             # We may exit from:
             # orelse (covering: no body, body until continue, and all body)
-            # break
+            # `break`
             self.uncheckpointed_statements.update(
                 self.loop_state.uncheckpointed_before_break
             )

flake8_trio/visitors/visitor_utility.py

@@ -7,7 +7,6 @@
 import re
 from typing import TYPE_CHECKING, Any
 
-import libcst as cst
 import libcst.matchers as m
 from libcst.metadata import PositionProvider
 
@@ -17,6 +16,8 @@
 if TYPE_CHECKING:
     from re import Match
 
+    import libcst as cst
+
 
 @utility_visitor
 class VisitorTypeTracker(Flake8TrioVisitor):

pyproject.toml

@@ -35,3 +35,75 @@ reportShadowedImports = true
 reportUninitializedInstanceVariable = true
 reportUnusedCallResult = false
 strict = ["*.py", "tests/*.py", "flake8_trio/**/*.py"]
+
+[tool.ruff]
+extend-exclude = [
+  ".*",
+  "tests/eval_files/*",
+  "tests/autofix_files/*"
+]
+ignore = [
+  "COM",  # flake8-comma, handled by black
+  "ANN",  # annotations, handled by pyright/mypy
+  "T20",  # flake8-print
+  "TID252",  # relative imports from parent modules https://github.com/Zac-HD/flake8-trio/pull/196#discussion_r1200413372
+  "D101",
+  "D102",
+  "D103",
+  "D105",
+  "D106",
+  "D107",
+  "S101",
+  "D203",  # one-blank-line-before-class
+  "D213",  # multi-line-summary-second-line
+  "EM101",  # exception must not use a string literal
+  "EM102",  # exception must not use an f-string literal
+  'PGH001',  # No builtin `eval()` allowed
+  'N802',  # function name should be lowercase - not an option with inheritance
+  'PTH123',  # `open()` should be replaced by `Path.open()`
+  'PYI021',  # docstring in stub
+  'S603',  # `subprocess` call: check for execution of untrusted input
+  'N815',  # Variable `visit_AsyncWith` in class scope should not be mixedCase
+  'PLR091',  # Too many return statements/branches/arguments
+  'C901',  # function is too complex
+  # maybe should be ignored in-place
+  'N806',  # Variable `MyDict` in function should be lowercase
+  # --- maybe should be fixed / ignored in-place ---
+  'ARG001',  # Unused function argument
+  'ARG002',  # Unused method argument
+  'B904',  # Within an `except` clause, raise exceptions with `raise ... from err` or `raise ... from None` to distinguish them from errors in exception handling
+  'B905',  # zip without explicit strict parameter
+  'BLE001',  # Do not catch blind exception: `Exception`
+  'FBT001',  # Boolean positional arg in function definition
+  'FBT002',  # Boolean default value in function definition
+  'N801',  # Class name {} should use CapWords convention
+  'PGH003',  # Use specific rule codes when ignoring type issues
+  'PLR2004',  # Magic value used in comparison
+  'PLW2901',  # Outer `for` loop variable `err` overwritten by inner `for` loop target
+  'PTH118',  # `os.path.join()` should be replaced by `Path` with `/` operator
+  'S607',  # Starting a process with a partial executable path
+  'SLF001',  # Private member accessed: `_tree`
+  'TD002',  # missing author in TODO
+  'TD003',  # missing issue link in TODO
+  'TRY003',  # Avoid specifying long messages outside the exception class
+  'TRY200',  # Use `raise from` to specify exception cause
+  'TRY201',  # Use `raise` without specifying exception name
+  # enable if flake8/plugins are removed
+  'PGH004',  # Use specific rule codes when using `noqa`
+  'RUF100'  # Unused `noqa` - enable only if flake8 is no longer used
+]
+line-length = 90
+select = ["ALL"]
+target-version = "py39"
+
+[tool.ruff.per-file-ignores]
+# docstrings, and arguments we can't modify
+"*.pyi" = ["D", 'FBT001', 'PLR0913']
+# imports
+"flake8_trio/visitors/__init__.py" = [
+  "F401",
+  "E402"
+]
+# visitor_utility contains comments specifying how it parses noqa comments, which get
+# parsed as noqa comments
+"flake8_trio/visitors/visitor_utility.py" = ["RUF100", "PGH004"]

tests/test_changelog_and_version.py

@@ -83,7 +83,7 @@ def ensure_tagged() -> None:
 def update_version() -> None:
     # If we've added a new version to the changelog, update __version__ to match
     last_version = next(iter(get_releases()))
-    if VERSION != last_version:
+    if last_version != VERSION:
         INIT_FILE = ROOT_PATH / "flake8_trio" / "__init__.py"
         subs = (f'__version__ = "{VERSION}"', f'__version__ = "{last_version}"')
         INIT_FILE.write_text(INIT_FILE.read_text().replace(*subs))

tests/test_decorator.py

@@ -94,7 +94,7 @@ def test_pep614():
 
 
 def test_command_line_1(capfd: pytest.CaptureFixture[str]):
-    Application().run(common_flags + ["--no-checkpoint-warning-decorators=app.route"])
+    Application().run([*common_flags, "--no-checkpoint-warning-decorators=app.route"])
     assert capfd.readouterr() == ("", "")
 
 
@@ -115,7 +115,7 @@ def test_command_line_1(capfd: pytest.CaptureFixture[str]):
 
 
 def test_command_line_2(capfd: pytest.CaptureFixture[str]):
-    Application().run(common_flags + ["--no-checkpoint-warning-decorators=app"])
+    Application().run([*common_flags, "--no-checkpoint-warning-decorators=app"])
     assert capfd.readouterr() == (expected_out, "")
 
 

tests/test_flake8_trio.py

@@ -13,10 +13,10 @@
 import tokenize
 import unittest
 from argparse import ArgumentParser
-from collections import deque
+from collections import defaultdict, deque
 from dataclasses import dataclass, fields
 from pathlib import Path
-from typing import TYPE_CHECKING, Any, DefaultDict
+from typing import TYPE_CHECKING, Any
 
 import libcst as cst
 import pytest
@@ -66,7 +66,7 @@ def check_version(test: str):
 ERROR_CODES: dict[str, Flake8TrioVisitor] = {
     err_code: err_class  # type: ignore[misc]
     for err_class in (*ERROR_CLASSES, *ERROR_CLASSES_CST)
-    for err_code in err_class.error_codes.keys()  # type: ignore[attr-defined]
+    for err_code in err_class.error_codes  # type: ignore[attr-defined]
 }
 
 
@@ -500,11 +500,11 @@ def print_first_diff(errors: Sequence[Error], expected: Sequence[Error]):
 
 def assert_correct_lines_and_codes(errors: Iterable[Error], expected: Iterable[Error]):
     """Check that errors are on correct lines."""
-    MyDict = DefaultDict[int, DefaultDict[str, int]]  # TypeAlias
+    MyDict = defaultdict[int, defaultdict[str, int]]  # TypeAlias
 
     all_lines = sorted({e.line for e in (*errors, *expected)})
 
-    error_dict: MyDict = DefaultDict(lambda: DefaultDict(int))
+    error_dict: MyDict = defaultdict(lambda: defaultdict(int))
     expected_dict = copy.deepcopy(error_dict)
 
     # populate dicts with number of errors per line
@@ -622,7 +622,6 @@ def test_line_numbers_match_end_result():
     plugin = Plugin.from_source(text)
     initialize_options(plugin, args=["--enable=TRIO100,TRIO115", "--autofix=TRIO100"])
     errors = tuple(plugin.run())
-    plugin.module.code
     assert errors[1].line != plugin.module.code.split("\n").index("trio.sleep(0)") + 1
 
 

typings/flake8/options/manager.pyi

@@ -7,7 +7,7 @@ Generated for flake8 5, so OptionManager signature is incorrect for flake8 6
 import argparse
 import enum
 from collections.abc import Callable, Mapping, Sequence
-from typing import Any, TypeAlias
+from typing import Any
 
 from flake8.plugins.finder import Plugins