Makefile with help

Makefile

.DEFAULT_GOAL := help
.PHONY: help

## This is demo target
# Example: make demo
demo:
	echo "D E M O"

## Prints this help
help:
	@awk -v skip=1 \
		'/^##/ { sub(/^[#[:blank:]]*/, "", $$0); doc_h=$$0; doc=""; skip=0; next } \
		skip  { next } \
		/^#/  { doc=doc "\n" substr($$0, 2); next } \
		/:/   { sub(/:.*/, "", $$0); printf "\033[34m%-30s\033[0m\033[1m%s\033[0m %s\n\n", $$0, doc_h, doc; skip=1 }' \
		$(MAKEFILE_LIST)