.DEFAULT_GOAL := report.html
totals.tsv: data.tsv
	@printf "aggregate data\n"
	@awk '{sum[$$1]+=$$2} END {for (key in sum) print key, sum[key]}' $< | sort > $@
chart.svg: totals.tsv plot.gp
	@printf "draw chart\n"
	@gnuplot plot.gp
report.html: chart.svg
	@printf "publish report\n"
	@printf '<!doctype html><title>Make report</title><h1>Totals</h1><img src="chart.svg" alt="Totals by category">\n' > $@