TIMESTAMP=$(shell date +%Y-%m-%d_%H%M)
CURRENT_TP1 := $(wildcard tp1_*.pdf)
ifeq ($(strip $(CURRENT_TP1)),)
override CURRENT_TP1 = bogus_tp1.pdf
endif

all: $(CURRENT_TP1)

$(CURRENT_TP1): build/tp1.pdf
	@rm -f $(CURRENT_TP1)
	@cp build/tp1.pdf tp1_${TIMESTAMP}.pdf
	@echo Updated

build/tp1.pdf: tp1.tex
	@latexmk -pdf tp1.tex

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