Convert X11R6 bitmap fonts to Python PIL format

Makefile

PILFONT     ?= pilfont.py
BUILD       ?= build
BROKEN      ?= broken
FONT_PATH   ?= xc/fonts/bdf/75dpi xc/fonts/bdf/misc xc/fonts/bdf/unnec_75dpi
FONT_BDF    := $(shell find $(FONT_PATH) -name "*.bdf" -exec basename {} \;)

ifneq ($(wildcard $(BROKEN)),)
FONT_IGNORE := $(shell cat $(BROKEN))
FONT_BDF    := $(filter-out $(FONT_IGNORE),$(FONT_BDF))
endif

vpath %.bdf $(FONT_PATH)

# Beware, do not "make clean all", instead "make clean && make all"
.PHONY: all
all: $(FONT_PATH) $(FONT_BDF:%.bdf=$(BUILD)/%.pil)
        $(if $(FONT_BDF),,$(MAKE) $@)

xc-2.tar.gz:
        wget https://www.x.org/releases/X11R6/$@

$(FONT_PATH): xc-2.tar.gz
        tar zxf $<

$(BUILD):
        mkdir $(BUILD)

$(BUILD)/%.pil: %.bdf | $(BUILD)
        $(PILFONT) $< \
        && mv $(patsubst %.bdf,%.pil,$<) $@ \
        || basename $< >> $(BROKEN)

.PHONY: clean
clean:
        rm -rf $(BUILD) $(FONT_IGNORE_PATH) xc*