timestamp=$(shell date +%Y-%m-%d_%H:%M)

all: pre-requis ctd1

pre-requis: pre-requis.tex
	@latexmk -pdf pre-requis.tex
	@if ! cmp --silent build/pre-requis.pdf pre-requis_*.pdf; then \
		touch pre-requis_tmp.pdf; \
		rm pre-requis*.pdf; \
		cp build/pre-requis.pdf pre-requis_${timestamp}.pdf; \
		echo "Updated"; \
	fi

ctd1: ctd1.tex
	@latexmk -pdf ctd1.tex
	@if ! cmp --silent build/ctd1.pdf ctd1_*.pdf; then \
		touch ctd1_tmp.pdf; \
		rm ctd1*.pdf; \
		cp build/ctd1.pdf ctd1_${timestamp}.pdf; \
		echo "Updated"; \
	fi

ctd2: ctd2.tex
	@latexmk -pdf ctd2.tex
	@if ! cmp --silent build/ctd2.pdf ctd2_*.pdf; then \
		touch ctd2_tmp.pdf; \
		rm ctd2*.pdf; \
		cp build/ctd2.pdf ctd2_${timestamp}.pdf; \
		echo "Updated"; \
	fi

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