Add flake8 to the pre-commit hooks

Author: youtux

.pre-commit-config.yaml

@@ -23,9 +23,8 @@ repos:
     hooks:
     -   id: pyupgrade
         args: ["--py39-plus"]
-# TODO: Enable mypy checker when the checks succeed
-#-   repo: https://github.com/pre-commit/mirrors-mypy
-#    rev: v0.931
-#    hooks:
-#    -   id: mypy
-#        additional_dependencies: [types-setuptools]
+-   repo: https://github.com/pycqa/flake8
+    rev: "7.1.1"
+    hooks:
+    -   id: flake8
+        additional_dependencies: ["flake8-pyproject"]

pyproject.toml

@@ -59,6 +59,10 @@ build-backend = "poetry.core.masonry.api"
 line-length = 120
 target-version = ["py39", "py310", "py311", "py312"]
 
+[tool.flake8]
+# E: indentation erros; ignore all, since we already use `black`
+extend-ignore = "E"
+
 [tool.isort]
 profile = "black"
 line_length = 120