svgs=
minified_svgs= $(svgs:.svg=.min.svg)
generated_images= $(svgs:.svg=.png)
images=
images += $(generated_images) $(minified_svgs)

objects= $(generated_images) $(minified_svgs) .sha1sums.styl css.css tags

all: $(objects)

clean:
	rm -f $(objects)

css.css: style.styl .sha1sums.styl inc/wfpl/stylus_helpers.styl
	stylus -p $< > $@ || rm -f "$@"

.sha1sums.styl: $(images)
	( \
		echo -n 'sha1 = {'; \
		div=' '; \
		for x in $^; do \
			echo -n "$$div '$$x': \"$$x?m=$$(sha1sum < $$x | head -c 10)\""; \
			div=,; \
		done; \
		echo " }"; \
	) > $@ || ( \
		rm -f $@; \
		exit 1; \
	)
%.png: %.svg
	( \
		inkscape -f $< -e $@ --export-area-page --without-gui --export-dpi=360 \
		&& mogrify -alpha off -geometry '25%' $@ \
		&& pngfix $@ \
	) || ( \
		rm -f $@ \
		; exit 1 \
	)

%.min.svg: %.svg
	svgo $< $@

tags: *.php inc/*.php inc/wfpl/*.php
	ctags *.php inc/*.php inc/wfpl/*.php