appcache>contents = $(shell grep -vFx -e "*" -e "CACHE MANIFEST" -e "CACHE:" -e "NETWORK:" -e "FALLBACK:" $(1) | grep -v -e "^\#" )

.PHONY: all clean

.SECONDEXPANSION:
%.appcache: %.appcache.in $$(call appcache>contents,$$*.appcache.in)
	sed "s/<Last-Updated>$$/Last-Updated: `date -u +'%Y-%m-%dT%H:%M:%SZ'`/" $< > $@

CONVERT.svg.png ?= rsvg-convert -f png

favicon_%.png: favicon.svg
	$(CONVERT.svg.png) -w $(*F) -h $(*F) < $< > $@

ICONS := $(patsubst %,favicon_%.png,256 192 128 32)

all: heroik.appcache $(ICONS)

clean:
	$(RM) heroik.appcache $(ICONS)