Makefile

fmt_targetfile:=.gofmt

build: check_format

check_format: $(fmt_targetfile)
	@if [[ `cat $(fmt_targetfile)` != "" ]]; then \
		echo "These need to be formatted:\n\t$(shell cat $(fmt_targetfile))"; \
		exit 1; \
	else \
	  echo 'Good to go!'; \
	fi

# fmt_message ensures this regenerates the file every run
$(fmt_targetfile): fmt_message
	@gofmt -l $(shell git ls-files | egrep '\.go$') >$@

.PHONY: fmt_message
fmt_message:
	@echo "Ensuring .go files are formatted correctly..."

.PHONY: clean
clean:
	rm $(fmt_targetfile)