a4.pdf: main.md
	pandoc\
	    --standalone\
	    -V urlcolor=RedViolet\
	    -V papersize:A4\
	    $< -o $@

a4.ps: a4.pdf
	pdf2ps $< $@

a4-signature.ps: a4.ps
	psbook $< $@

a5-signature.ps: a4-signature.ps
	psnup -2 $< $@

a5-signature.pdf: a5-signature.ps
	ps2pdf $< $@

.PHONY: clean
clean:
	rm -f a4.pdf
	rm -f a4.ps
	rm -f a4-signature.pdf
	rm -f a4-signature.ps
	rm -f a5-signature.pdf
	rm -f a5-signature.ps

.PHONY: help
help:
	@echo "Usage:"
	@echo "  make TARGET"
	@echo
	@echo "Available targets:"
	@echo "  a4.pdf"
	@echo "  a4.ps"
	@echo "  a4-signature.pdf"
	@echo "  a4-signature.ps"
	@echo "  a5-signature.pdf"
	@echo "  a5-signature.ps"
	@echo "  clean"
	@echo "  help"