dirs := $(subst " . "," ",$(subst /Makefile,,$(shell find -name Makefile)))
pdfs := $(subst .md,.pdf,$(shell find -name *.md))
.PHONY: clean default
default: $(dirs) $(pdfs)
$(dirs):
	$(MAKE) -C $@
%.pdf: %.md
	pandoc -V geometry:margin=1cm $< -o $@
clean:
	for dir in $(dirs); do \
		$(MAKE) -C $$dir clean; \
	done
	rm -rf $(pdfs)