A much simpler "make help"

help.mk

# make help
# 
# Usage: Download this file and put it somewhere. In a GNU Makefile, add the 
# following line near the top of your Makefile:
#
# ```
# include /path/to/help.mk
# ```
#
# Alternatively, you could just cut and paste the code from this gist into your
# Makefile.  Any target that ends with "## description of target" will be shown 
# with a helpful description.  Including this one!  Example:
# 
# ```
# $ make help
# 
# Specify a command. The choices are:
# 
#   help:  show this help
#
# $
# ```
#
# I firmly believe that Makefiles are documentation, and having a convenient and
# well-maintained documentation system embedded in your Makefiles is an important
# step to developer bliss.
#

HELP_WIDTH := $(shell grep '^[a-z][^ ]*:.*\#\#' Makefile 2>/dev/null | cut -d':' -f1 | awk '{printf "%d\n", length}' | sort -rn | head -1)
help:  ## Show this help
	@echo "\nSpecify a command. The choices are:\n"
	@grep -Eh '^[0-9a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | \
		awk 'BEGIN {FS = ":.*?## "}; {printf "  \033[0;36m%-$(HELP_WIDTH)s  \033[m %s\n", $$1, $$2}' | \
		sort
	@echo ""