markdown := $(wildcard *.mdwn)
hypertext = $(subst index/index,index,$(markdown:%.mdwn=%/index.html))

all: $(hypertext)

%.html %/index.html: %.mdwn
	$(if $(filter-out ./,$(dir $@)),mkdir -p $(dir $@))
	pandoc -f markdown -t html -o $@ $<

clean:
	find -type f -name '*.html' -delete
	find -type d -empty -delete

.PHONY: all clean