Sandbox/CI: Add poethepoet task runner, use it for poe {lint,format}

Also, add `ruff` linter, and remove `flake8`.

Makefile

@@ -15,10 +15,10 @@ $(eval bumpversion  := $(venvpath)/bin/bumpversion)
 $(eval twine        := $(venvpath)/bin/twine)
 $(eval sphinx       := $(venvpath)/bin/sphinx-build)
 $(eval coverage     := $(venvpath)/bin/coverage)
-$(eval flake8       := $(venvpath)/bin/pflake8)
 $(eval black        := $(venvpath)/bin/black)
 $(eval isort        := $(venvpath)/bin/isort)
 $(eval proselint    := $(venvpath)/bin/proselint)
+$(eval poe          := $(venvpath)/bin/poe)
 
 
 # Setup Python virtualenv
@@ -101,12 +101,10 @@ install-tests: setup-virtualenv
 # ----------------------
 
 format: setup-virtualenv
-	$(black) .
-	$(isort) .
+	$(poe) format
 
 lint: setup-virtualenv
-	$(flake8) luftdatenpumpe tests
-	$(proselint) *.rst doc/**/*.rst
+	$(poe) lint
 
 
 # -------

pyproject.toml

@@ -1,18 +1,24 @@
+# ==================
+# Tool configuration
+# ==================
+
 [tool.black]
 line-length = 120
 
+[tool.coverage.report]
+fail_under = 0
+show_missing = true
+
+[tool.coverage.run]
+omit = [
+    "tests/*",
+]
+
 [tool.isort]
 profile = "black"
 line_length = 120
 multi_line_output = 3
 
-[tool.flake8]
-max-line-length = 120
-per-file-ignores = """
-    luftdatenpumpe/commands.py: E501
-    luftdatenpumpe/source/rdbms.py: E501
-"""
-
 [tool.pytest.ini_options]
 minversion = "2.0"
 addopts = "-rsfEX -p pytester --strict-markers --verbosity=3 --cov --cov-report=term-missing --cov-report=xml"
@@ -22,11 +28,29 @@ xfail_strict = true
 markers = [
 ]
 
-[tool.coverage.run]
-omit = [
-    "tests/*",
+[tool.ruff]
+line-length = 120
+extend-exclude = [
+  "var",
 ]
 
-[tool.coverage.report]
-fail_under = 0
-show_missing = true
+
+# ===================
+# Tasks configuration
+# ===================
+
+[tool.poe.tasks]
+build = {cmd="python -m build"}
+format = [
+  {cmd="black ."},
+  {cmd="isort ."},
+]
+lint = [
+  {cmd="ruff ."},
+  {cmd="black --check ."},
+  {cmd="isort --check ."},
+  {cmd="proselint *.rst doc/**/*.rst"}
+]
+test = [
+  {cmd="pytest"},
+]

requirements-utils.txt

@@ -1,9 +1,9 @@
 # Sandbox
 black
 isort
-pyproject-flake8
-flake8<5
+poethepoet<1
 proselint
+ruff
 
 # Release
 build