publish: letter.pdf
	if [ ! -d "published" ]; then mkdir published; fi
	cp letter.pdf published/letter.pdf
	if [ ! -d "published/archive" ]; then mkdir published/archive/; fi
	cp letter.pdf published/archive/letter_$(shell date -u +"%Y-%m-%dT%H:%M:%SZ").pdf

letter.pdf: letter.tex
	latexmk -pdf letter.tex

start: view watch

view:
	-zathura letter.pdf &!

watch:
	latexmk -pdf -pvc letter.tex