.RECIPEPREFIX +=
TARGET = letter.pdf
SIGIMAGE = figures/signature.png.gpg

all: $(TARGET)


$(TARGET): update-sig main.pdf
    mv main.pdf letter.pdf


main.pdf:
    rubber -m xelatex main.tex


update-sig:
    gpg --yes --output figures/signature.png --decrypt $(SIGIMAGE)


clean:
    rubber -m xelatex --clean main.tex && $(RM) $(TARGET) && $(RM) figures/signature.png