Makefile

# Help based on https://gist.github.com/prwhite/8168133 thanks to @nowox and @prwhite
# And add help text after each target name starting with '\#\#'
# A category can be added with @category

HELP_FUN = \
	%help; \
	while(<>) { push @{$$help{$$2 // 'options'}}, [$$1, $$3] if /^([\w-]+)\s*:.*\#\#(?:@([\w-]+))?\s(.*)$$/ }; \
	print "\nusage: make [target ...]\n\n"; \
	for (keys %help) { \
		print "$$_:\n"; \
		for (@{$$help{$$_}}) { \
				$$sep = "." x (25 - length $$_->[0]); \
				print "  $$_->[0]$$sep$$_->[1]\n"; \
		} \
		print "\n"; \
	}

help: ##@system show this help
	@perl -e '$(HELP_FUN)' $(MAKEFILE_LIST)