SVG_GENERATE_FORMATS  ?= png svg
SVG                   ?= $(filter-out copied-%,$(wildcard *.svg))
COPIED_SVG             = $(addprefix copied-,$(notdir $(SVG)))

GENERATED_WIDTHS      ?= 50 100 200 300 400 500 600 700 800 546

ifneq ($(filter png,$(SVG_GENERATE_FORMATS)),)
  GENERATED_WIDTHS_PNG  ?= $(GENERATED_WIDTHS)
  GENERATED_PNG         ?= \
  	$(foreach w, $(GENERATED_WIDTHS_PNG),$(patsubst %.svg,%-$w.png,$(notdir $(SVG))))
  GENERATED_IMAGES      += $(GENERATED_PNG)
endif

ifneq ($(filter ico,$(SVG_GENERATE_FORMATS)),)
  GENERATED_WIDTHS_ICO  ?= 16 32
  GENERATED_ICO         ?= \
  	$(foreach w, $(GENERATED_WIDTHS_ICO),$(patsubst %.svg,%-$w.ico,$(notdir $(SVG))))
  GENERATED_IMAGES      += $(GENERATED_ICO)
endif

ifneq ($(filter pdf,$(SVG_GENERATE_FORMATS)),)
  GENERATED_WIDTHS_ICO  ?= 16 32
  GENERATED_PDF         ?= $(patsubst %.svg,%.pdf,$(notdir $(SVG)))
  GENERATED_IMAGES      += $(GENERATED_PDF)
endif

ifneq ($(filter svg,$(SVG_GENERATE_FORMATS)),)
  IMAGES                += $(notdir $(SVG))
endif

all: $(GENERATED_IMAGES)
install:
clean: clean.images
distclean:

clean.images:
	rm -f $(GENERATED_IMAGES) $(COPIED_SVG)

%.png: $(COPIED_SVG)
	inkscape -w $(shell echo $* | sed 's/.*-//') \
		--export-png=$@ copied-$(shell echo $* | sed 's/-[0-9]\+$$//').svg

%.pdf: copied-%.svg
	inkscape --export-pdf=$@ $<

copied-%.svg: $(SVG)
	@echo $^
	cp $(filter %$*.svg, $^) $@.tmp
	mv $@.tmp $@

%.ico: %.png
	icotool -o $@ -c $<