timestamp=$(shell date +%Y-%m-%d_%H:%M)
texfile20210922=contrat-independant-romance-martin

all: 20210922

20210922: contrat-independant-romance-martin.tex
	@latexmk -pdf ${texfile20210922}.tex >/dev/null 2>&1
	@if ! cmp --silent build/${texfile20210922}.pdf ${texfile20210922}_*.pdf; then \
		touch ${texfile20210922}_tmp.pdf; \
		rm ${texfile20210922}*.pdf; \
		cp build/${texfile20210922}.pdf ${texfile20210922}_${timestamp}.pdf; \
		echo "Updated"; \
	fi

clean:
	@rm -rf build 2>/dev/null