Centralize project commands to a `Makefile`

CONTRIBUTING.md

@@ -5,10 +5,10 @@
 From the project root directory, execute the following command:
 
 ```sh
-python ./manage.py test
+make test
 ```
 
-### How to maintain `requirements.txt`?
+### How to maintain the Requirements File (`requirements.txt`)?
 
 The canonical list of installation requirements (including development requirements) is maintained in the [`setup.py`](setup.py) file.
 
@@ -17,7 +17,7 @@ The Requirements File ([`requirements.txt`](requirements.txt)) file must be kept
 To to automatically generate or update `requirements.txt` based on `setup.py`, run [`pip-tools`](https://github.com/jazzband/pip-tools)’s `pip-compile`:
 
 ```sh
-python -m piptools compile --output-file=requirements.txt
+make generate_requirements_file
 ```
 
 **Warning:** Due to [limitations](https://github.com/jazzband/pip-tools/issues/908) in `pip-tools`, the same workflow can not be used for generating a `dev-requirements.txt` file, and requirements can not be declared in a `setup.cfg` file.
@@ -25,7 +25,7 @@ python -m piptools compile --output-file=requirements.txt
 ### How to install modules required for development?
 
 ```sh
-python -m pip install -e ".[dev]"
+make install_dev
 ```
 
 ### How to run a code formatter?
@@ -34,10 +34,10 @@ Run [Black](https://black.readthedocs.io/):
 
 ```sh
 # Dry-run, showing what should be rewritten:
-python -m black --target-version=py36 --diff .
+make check_code_format
 
 # Run code format:
-python -m black --target-version=py36 .
+make format_code
 ```
 
 ### How to run a linter?
@@ -45,5 +45,5 @@ python -m black --target-version=py36 .
 Run [Flake8](https://flake8.pycqa.org/):
 
 ```sh
-python -m flake8
+make lint
 ```

Makefile

@@ -0,0 +1,39 @@
+.PHONY: \
+	clean \
+	check_code_format \
+	format_code \
+	generate_requirements_file \
+	install \
+	install_dev \
+	lint \
+	run \
+	test
+
+clean:
+	# https://stackoverflow.com/a/41386937/162086
+	python3 -Bc "for p in __import__('pathlib').Path('.').rglob('*.py[co]'): p.unlink()"; \
+	python3 -Bc "for p in __import__('pathlib').Path('.').rglob('__pycache__'): p.rmdir()"
+
+check_code_format:
+	python3 -m black --target-version=py36 --diff .
+
+format_code:
+	python3 -m black --target-version=py36 .
+
+generate_requirements_file:
+	python3 -m piptools compile --output-file=requirements.txt
+
+install:
+	python3 -m pip install -r requirements.txt
+
+install_dev:
+	python3 -m pip install -e ".[dev]"
+
+lint:
+	python3 -m flake8
+
+run:
+	python3 ./manage.py runserver --ipv6
+
+test:
+	python3 ./manage.py test

README.md

@@ -7,5 +7,5 @@ A micro project proposed as a screening task for the [Senior Django Developer](h
 On a system, or in a virtual environment where [Python](https://www.python.org/) version 3.6 or above, and [`pip`](https://pip.pypa.io/) and [`setuptools`](https://pypi.org/project/setuptools/) are available, run the following command to install required modules:
 
 ```sh
-python -m pip install -r requirements.txt
+make install
 ```