data=$(wildcard ./*.dat)

diagram=${data:.dat=.png}

code=i.gpi

all: ${diagram}

%.png: %.dat ${code}
	gnuplot -e "set terminal png; set output '$@'; data=$*" ${code}
	$(eval inverted=$*_inverted.png)
	convert -negate $@ ${inverted}
	$(shell zsh -c "thumb 200 ${inverted}")

ascii: ${data} ${code}
	for d in ${data:.dat=} ; do \
		gnuplot -e "set terminal dumb; data=$$d" ${code} ; \
	done
	${MAKE} all

x: ${data} ${code}
	for d in ${data:.dat=} ; do \
		gnuplot -p -e "data=$$d" ${code} ; \
	done
	${MAKE} all

clean:
	rm ${diagram} thumbs/*