Add help command to Makefile (#42)

* Add help command to Makefile

* Update tests

tests/test_makefile.py

@@ -11,14 +11,16 @@ def test_makefile_total_lines(cookies, context, black, pipenv, mypy):
     We expect Makefile has below content
     ```
     1 .PHONY: check
-    2 check:
-    3     isort
-    4     black
-    5
-    6 .PHONY: format
-    7 format:
-    8     isort
-    9     black
+    2 ## check: check if everything's okay
+    3 check:
+    4     isort
+    5     black
+    6
+    7 .PHONY: format
+    8 ## format: format files
+    9 format:
+    10     isort
+    11     black
     ```
     """
     ctx = context(black=black, pipenv=pipenv, mypy=mypy)
@@ -27,10 +29,10 @@ def test_makefile_total_lines(cookies, context, black, pipenv, mypy):
     makefile = result.project.join('Makefile')
     lines = makefile.readlines(cr=False)
 
-    expected = 31
+    expected = 43
     expected -= 2 if black == 'n' else 0
     expected -= 1 if mypy == 'do not use' else 0
-    expected += 5 if pipenv == 'y' else 0
+    expected += 6 if pipenv == 'y' else 0
     assert len(lines) == expected
 
 
@@ -45,8 +47,8 @@ def test_makefile_total_section(cookies, context, black, pipenv, mypy):
     content = makefile.read()
     sections = content.strip().split('\n\n')
 
-    expected = 7
-    expected -= 1 if pipenv == 'n' else 0
+    expected = 8  # init,check,format,test,coverage,htmlcov,requirements,help
+    expected -= 1 if pipenv == 'n' else 0  # requirements
     assert len(sections) == expected
 
 
@@ -59,6 +61,6 @@ def test_makefile_phony(cookies, context, pipenv):
 
     phonies = re.findall(r'\.PHONY: (\w+)', makefile.read())
 
-    expected = 7
-    expected -= 1 if pipenv == 'n' else 0
+    expected = 8  # init,check,format,test,coverage,htmlcov,requirements,help
+    expected -= 1 if pipenv == 'n' else 0  # requirements
     assert len(set(phonies)) == expected

{{cookiecutter.project_slug}}/Makefile

@@ -1,4 +1,5 @@
 .PHONY: init
+## init: install requirements
 init:
 {%- if cookiecutter.use_pipenv|lower != 'n' %}
 	pip install pipenv
@@ -9,6 +10,7 @@ init:
 {%- endif %}
 
 .PHONY: check
+## check: check if everything's okay
 check:
 	isort --recursive --check-only {{ cookiecutter.package_name }} tests
 {%- if cookiecutter.use_black|lower != 'n' %}
@@ -20,21 +22,25 @@ check:
 {%- endif %}
 
 .PHONY: format
+## format: format files
 format:
 	isort -rc -y {{ cookiecutter.package_name }} tests
 {%- if cookiecutter.use_black|lower != 'n' %}
 	black -S -l 79 {{ cookiecutter.package_name }} tests
 {%- endif %}
 
 .PHONY: test
+## test: run tests
 test:
 	python -m pytest
 
 .PHONY: coverage
+## coverage: run tests with coverage
 coverage:
 	python -m pytest --cov {{ cookiecutter.package_name }} --cov-report term --cov-report xml
 
 .PHONY: htmlcov
+## htmlcov: run tests with coverage and create coverage report HTML files
 htmlcov:
 	python -m pytest --cov {{ cookiecutter.package_name }} --cov-report html
 	rm -rf /tmp/htmlcov && mv htmlcov /tmp/
@@ -43,7 +49,14 @@ htmlcov:
 {%- if cookiecutter.use_pipenv|lower != 'n' %}
 
 .PHONY: requirements
+## requirements: update requirements.txt
 requirements:
 	pipenv lock -r > requirements.txt
 	pipenv lock -dr > requirements-dev.txt
 {%- endif %}
+
+.PHONY: help
+## help: prints this help message
+help:
+	@echo "Usage: \n"
+	@sed -n 's/^##//p' ${MAKEFILE_LIST} | column -t -s ':'