make help target (parses the makefile itself and prints the target and description, which is provided behind ##)

Makefile

target1: ## does some stuff
    echo target1
   
target2: target1 ## this wil l only print target2 not target1
    echo target2

help: ## prints help for target1 and target2
	@grep '##' $(MAKEFILE_LIST) \
		| grep -Ev 'grep|###' \
		| sed -e 's/^\([^:]*\):[^#]*##\([^#]*\)$$/\1:\2/' \
		| awk -F ":" '{ printf "%-18s%s\n", $$1 ":", $$2 }' \
		| grep -v 'sed'