Inspired by deno task:
# Example makefile with some dummy rules
.PHONY: all
## Make ALL the things; this includes: building the target, testing it, and
## deploying to server.
all: test deploy
.PHONY: build
# No documentation; target will be omitted from help display
build:
${MAKE} -C build all
.PHONY: test
## Run unit tests
test: build
./run-tests .
.PHONY: deply
## Deploy to production server
deploy: build
./upload-to-server . $$SERVER_NAME
.PHONY: clean
## Remove temporary build files
clean:
${MAKE} -C build clean
# Plonk the following at the end of your Makefile
.DEFAULT_GOAL := show-help
# Inspired by <http://marmelab.com/blog/2016/02/29/auto-documented-makefile.html>
# sed script explained:
# /^##/:
# * save line in hold space
# * purge line
# * Loop:
# * append newline + line to hold space
# * go to next line
# * if line starts with doc comment, strip comment character off and loop
# * remove target prerequisites
# * append hold space (+ newline) to line
# * replace newline plus comments by `---`
# * print line
# Separate expressions are necessary because labels cannot be delimited by
# semicolon; see <http://stackoverflow.com/a/11799865/1968>
.PHONY: show-help
show-help:
@echo "$$(tput setaf 2)Available rules:$$(tput sgr0)";sed -ne"/^## /{h;s/.*//;:d" -e"H;n;s/^## /---/;td" -e"s/:.*//;G;s/\\n## /===/;s/\\n//g;p;}" ${MAKEFILE_LIST}|awk -F === -v n=$$(tput cols) -v i=4 -v a="$$(tput setaf 6)" -v z="$$(tput sgr0)" '{printf"- %s%s%s\n",a,$$1,z;m=split($$2,w,"---");l=n-i;for(j=1;j<=m;j++){l-=length(w[j])+1;if(l<= 0){l=n-i-length(w[j])-1;}printf"%*s%s\n",-i," ",w[j];}}'