Makefile help snipped

Makefile

# Lines prefixed with [hash]- are header lines
# Targets can have tailing [hash]: to document functions
# Target groups can have preceding lines [hash]? name: description to document target groups

help: #: Show this help
	@fgrep -h "#-" $(MAKEFILE_LIST) | fgrep -v fgrep | sed -e 's/#-\s//'
	@printf "\n"
	@printf "Common targets:\n"
	@fgrep -h "#+" $(MAKEFILE_LIST) | fgrep -v fgrep | sed -Ee "s/([^:]+)(.*)(#\+(.*))/- \1:\4/g"
	@printf "\nAvailable target groups:\n"
	@fgrep -h "#?" $(MAKEFILE_LIST) | fgrep -v fgrep | sed -Ee "s/^\#\? ([^:]+)\: (.*)/- \1: \2/g" | sort -bfi
	@printf "\nAvailable targets:\n"
	@fgrep -h "#:" $(MAKEFILE_LIST) | fgrep -v fgrep | sed -Ee "s/([^:]+)(.*)(#:(.*))/- \1:\4/g" | sort -bfi