all: ogre.appcache

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
CONVERT.png.ico ?= convert

PNGCRUSH ?= pngcrush
PNGCRUSHFLAGS ?= -brute -blacken -reduce -q
CRUSH.png ?= $(PNGCRUSH) $(PNGCRUSHFLAGS)

FAVICON_SIZES = 32 128 192 256
FAVICONS = $(patsubst %,favicon_%.png,$(FAVICON_SIZES)) favicon.ico

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

%.ico: %_48.png %_32.png %_16.png
	$(CONVERT.png.ico) $^ $@

all: $(FAVICONS) ogre.appcache

clean:
	$(RM) $(FAVICONS)
	$(RM) ogre.appcache