GENERATED_FILES = \
	ny.json

all: $(GENERATED_FILES)

.PHONY: clean all

clean:
	rm -rf -- $(GENERATED_FILES) build

build/tl_2012_%_tract.zip:
	mkdir build
	curl -o $@ 'http://www2.census.gov/geo/tiger/TIGER2012/TRACT/$(notdir $@)'

build/tracts-unfiltered.shp: build/tl_2012_36_tract.zip
	rm -rf -- $(basename $@)
	mkdir -p $(basename $@)
	unzip -d $(basename $@) $<
	for file in $(basename $@)/*; do chmod 644 $$file; mv $$file $(basename $@).$${file##*.}; done
	rmdir $(basename $@)
	touch $@

# strip water tracts
build/tracts.shp: build/tracts-unfiltered.shp
	rm -f -- $@
	ogr2ogr -f 'ESRI Shapefile' -where 'SUBSTR(GEOID,6,2) != "99"' $@ $<

ny.json: build/tracts.shp
	node_modules/.bin/topojson \
		-o $@ \
		-e ACS_12_5YR_B01003_with_ann.csv \
		--id-property=GEO.id2,GEOID \
		-p population=+HD01_VD01,area=+ALAND \
		--projection 'width = 960, height = 700, d3.geo.mercator() \
			.center([-75.819, 42.795]) \
			.scale(6.5 * width) \
			.translate([width / 2, height / 2])' \
		--simplify=.5 \
		-- $(filter %.shp,$^)
