# Generate Computer Modern Unicode font files for use with groff
# https://cm-unicode.sourceforge.io/

VERSION := 0.7.0
HASH    := f7c9209524dfe1dd40e680139645d07b2c34b187a4121ec444909d6429e2c76e
URL     := https://sourceforge.net/projects/cm-unicode/files/cm-unicode/$(VERSION)

FONT_ARCHIVE := cm-unicode-$(VERSION)-pfb.tar.xz

CURL := curl
CURL_FLAGS := --disable --location --progress-bar
AWK  := gawk
ENV  := /usr/bin/env
SHASUM := shasum
AFMTODIT := afmtodit

GROFF ?= $(shell which groff)
GROFF_FLAGS := 
DEVPS_DIR := $(dir $(GROFF))../share/groff/current/font/devps
include $(DEVPS_DIR)/generate/Makefile
srcdir := $(DEVPS_DIR)/generate
afmdir := .

cm-unicode-$(VERSION): download

download: $(FONT_ARCHIVE)
$(FONT_ARCHIVE):
	@# Download sources
	$(CURL) $(CURL_FLAGS) --output $@ $(URL)/$@/download
	@# Verify download
	echo "$(HASH)  $(FONT_ARCHIVE)" | $(SHASUM) -c
	@# Unpack sources
	tar Jxf $@

FONTS = $(basename $(notdir $(wildcard cm-unicode-$(VERSION)/*.pfb)))
fonts: $(FONTS)
	@# Create symlinks for groff font files to their font name as these are more self-explanatory
	grep ^FontName cm-unicode-$(VERSION)/*.afm \
		| sed -e 's#.*/##' -e 's#\.afm:FontName##' \
		| tr -d - \
		| xargs -n2 ln -sf \
		# grep sed tr xargs
	@# Create symlinks for groff font families and font styles
	ln -sf CMUSerifRoman           CMUSerifR
	ln -sf CMUSerifItalic          CMUSerifI
	ln -sf CMUSerifBold            CMUSerifB
	ln -sf CMUSerifBoldItalic      CMUSerifBI
	ln -sf CMUSansSerif            CMUSansSerifR
	ln -sf CMUSansSerif            CMUSansSerifRoman
	ln -sf CMUSansSerifOblique     CMUSansSerifI
	ln -sf CMUSansSerifOblique     CMUSansSerifItalic
	ln -sf CMUSansSerifBold        CMUSansSerifB
	ln -sf CMUSansSerifBoldOblique CMUSansSerifBI
	ln -sf CMUSansSerifBoldOblique CMUSansSerifBoldItalic
	ln -sf CMUTypewriterRegular    CMUTypewriterR
	ln -sf CMUTypewriterItalic     CMUTypewriterI
	ln -sf CMUTypewriterBold       CMUTypewriterB
	ln -sf CMUTypewriterBoldItalic CMUTypewriterBI
	ln -sf CMUBrightRoman          CMUBrightR
	ln -sf CMUBrightOblique        CMUBrightI
	ln -sf CMUBrightOblique        CMUBrightItalic
	ln -sf CMUBrightBold           CMUBrightB
	ln -sf CMUBrightBoldOblique    CMUBrightBI
	ln -sf CMUBrightBoldOblique    CMUBrightBoldItalic
	ln -sf CMUConcreteRoman        CMUConcreteR
	ln -sf CMUConcreteItalic       CMUConcreteI
	ln -sf CMUConcreteBold         CMUConcreteB
	ln -sf CMUConcreteBoldItalic   CMUConcreteBI
	@# Create convenience symlinks for groff fonts
	ln -sf CMUClassicalSerifItalic CMUSerifClassicalItalic
	@# Place groff font symlinks in the respective device directories
	cp -P CMU* devps/
	mv CMU* devpdf/

$(FONTS): | devps devpdf
	@# Generate groff font files and symlink to them in the respective device directories
	cd cm-unicode-$(VERSION); \
		$(AFMTODIT) -s $(EFLAG) $(RFLAG) $@.afm $(TEXTMAP) $@; \
		ln -sf ../cm-unicode-$(VERSION)/$@ ../devpdf; ln -sf ../cm-unicode-$(VERSION)/$@ ../devps
	@# Generate download files for generated groff fonts
	$(AWK) \
		-vdir=../cm-unicode-$(VERSION)/ \
		'/^name/{pf="$@.pfb"} /^internalname/{i=$$2} END{print i "\t" dir pf}' devps/$@ \
		| tee -a devps/download \
		| sed -e 's/^/\t/' >> devpdf/download

devps devpdf:
	mkdir -p $@