Add code formatting check to Makefile

Add code formatting check to Makefile using the black utility. The
Makefile commands .black-check and .black-format are added, similar to
the main st2 repo.

Author: m4dcoder

Makefile

@@ -77,10 +77,10 @@ all: requirements lint
 all-ci: compile .flake8 .pylint
 
 .PHONY: lint
-lint: requirements flake8 pylint
+lint: requirements flake8 pylint black-check
 
 .PHONY: .lint
-.lint: compile .flake8 .pylint
+.lint: compile .flake8 .pylint .black-check
 
 .PHONY: flake8
 flake8: requirements .clone_st2_repo .flake8
@@ -114,6 +114,20 @@ compilepy3:
 	@echo
 	. $(VIRTUALENV_DIR)/bin/activate; pylint -j $(PYLINT_CONCURRENCY) -E --rcfile=./lint-configs/python/.pylintrc --load-plugins=pylint_plugins.api_models --load-plugins=pylint_plugins.db_models st2rbac_backend/
 
+.PHONY: .black-check
+.black-check:
+	@echo
+	@echo "================== black ===================="
+	@echo
+	. $(VIRTUALENV_DIR)/bin/activate; black --config pyproject.toml st2rbac_backend bin setup.py -l 100 --check
+
+.PHONY: .black-format
+.black-format:
+	@echo
+	@echo "================== black ===================="
+	@echo
+	. $(VIRTUALENV_DIR)/bin/activate; black --config pyproject.toml st2rbac_backend bin setup.py -l 100
+
 .PHONY: .unit-tests
 .unit-tests:
 	@echo

lint-configs/python/.flake8

@@ -2,7 +2,7 @@
 max-line-length = 100
 # L102 - apache license header
 enable-extensions = L101,L102
-ignore = E128,E402,E722,W504
+ignore = E128,E402,E722,W504,E203,W503
 exclude=*.egg/*,build,dist
 
 # Configuration for flake8-copyright extension

pyproject.toml

@@ -0,0 +1,14 @@
+[tool.black]
+max-line-length = 100
+target_version = ['py36']
+include = '\.pyi?$'
+exclude = '''
+(
+  /(
+    | \.git
+    | \.virtualenv
+    | __pycache__
+    | test_content_version
+  )/
+)
+'''

test-requirements.txt

@@ -1 +1,2 @@
+black
 isort>=4.2.5