Makefile with help

Makefile

define PRINT_HELP_PYSCRIPT
import re, sys

for line in sys.stdin:
    match = re.match(r'^([a-zA-Z_-]+):.*?## (.*)$$', line)
    if match:
        target, help = match.groups()
        print("%-30s %s" % (target, help))
endef
export PRINT_HELP_PYSCRIPT

help:
    @python3 -c "$$PRINT_HELP_PYSCRIPT" < $(MAKEFILE_LIST)

image: secrets ## Build the container image.
    docker build --file Dockerfile