add flake8 linting to Makefile and github actions

.flake8

@@ -0,0 +1,5 @@
+[flake8]
+max-line-length = 120
+exclude =
+	.tox
+	.git

.github/workflows/install-deps.sh

@@ -3,7 +3,7 @@ set -e
 set -x
 
 # Test utilities
-pip install -U pip pytest coverage
+pip install -U pip pytest coverage flake8
 
 # Test dependencies (Server back-ends and template engines)
 sudo apt-get install -y libev-dev

.github/workflows/run_tests.yml

@@ -16,5 +16,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: .github/workflows/install-deps.sh
+    - name: Run flake8
+      run: flake8 bottle.py
     - name: Run tests
       run: pytest

Makefile

@@ -19,7 +19,7 @@ $(VENV)/.installed: Makefile
 	python3 -mvenv $(VENV)
 	$(VENV)/bin/python3 -mensurepip
 	$(VENV)/bin/pip install -U pip
-	$(VENV)/bin/pip install -U setuptools wheel twine pytest coverage
+	$(VENV)/bin/pip install -U setuptools wheel twine pytest coverage flake8
 	$(VENV)/bin/pip install -U sphinx sphinx-intl transifex-client
 	touch $(VENV)/.installed
 
@@ -58,6 +58,9 @@ tx:
 test: venv
 	. $(VENV)/bin/activate; pytest
 
+lint: venv
+	. $(VENV)/bin/activate; flake8 bottle.py
+
 clean:
 	rm -rf $(VENV) build/ dist/ MANIFEST .coverage .name htmlcov  2>/dev/null || true
 	find . -name '__pycache__' -exec rm -rf {} +