Makefile help

Makefile

@@ -1,20 +1,34 @@
 .PHONY: test docs build test-release release
-.DEFAULT_GOAL := build
+.DEFAULT_GOAL := help
 
-all: build
+# --------- Help script ---------
 
-test:
+define PRINT_HELP_PYSCRIPT
+import re, sys
+
+for line in sys.stdin:
+	match = re.match(r'^([a-zA-Z_-]+):.*?## (.*)$$', line)
+	if match:
+		target, help = match.groups()
+		print("%-20s %s" % (target, help))
+endef
+export PRINT_HELP_PYSCRIPT
+
+help:			## Show this help message
+	@python -c "$$PRINT_HELP_PYSCRIPT" < $(MAKEFILE_LIST)
+
+test:			## Test the library with tox
 	tox -e py39
 
-docs:
+docs:			## Generate documentation
 	cd docs && $(MAKE) html
 
-build:
+build:			## Build the library for distribution
 	 python -m build
 	 twine check dist/*
 
-test-release:
+test-release:	## Release the library on test pypi
 	twine upload -r testpypi --skip-existing dist/*
 
-release:
+release:		## Release the library on pypi
 	twine upload --skip-existing dist/*