VERSION != git tag | tail -1
QR_TARGET != grep mailto: README.md | cut -d: -f2,3 | tail -c+2
QR_CODE=\qrcode[height=.2\textwidth]{$(QR_TARGET)}

COMPRESS = gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.5 -dNOPAUSE -dQUIET -dBATCH -dPrinted=false -sOutputFile=$@ $<

CP := ln -f
BOOK != basename "$(shell pwd)"
TITLE != head -1 README.md | tail -c+3 | tr ' ' '_'
LOCAL_DROSS := rubbish
DROSS = ../$(LOCAL_DROSS)
DBOOK = $(DROSS)/$(BOOK).pdf
COMPILER = latexmk -file-line-error -output-directory=$(DROSS) -pdflua -interaction=nonstopmode -halt-on-error -shell-escape -r config/.latexmkrc -jobname=$(BOOK)
RELEASE = $(TITLE).pdf
GLOS := makeglossaries -d $(DROSS)
RUN := lualatex -output-directory $(DROSS) -shell-escape

targets += check

.PHONY: book
book: $(RELEASE) ## Compile the pdf
$(RELEASE): $(DBOOK)
	@$(CP) $< $@

targets += $(RELEASE)

.PHONY: LOCTEX
LOCTEX: $(wildcard *.tex)

.PHONY: HANDOUTS
HANDOUTS: config/CS.tex config/booklet.tex config/fold_front.tex config/fold_back.tex

.PHONY: STYLE_FILES
STYLE_FILES: $(wildcard config/*.sty)

.PHONY: EXTERNAL
EXTERNAL: $(wildcard $(DROSS)/*.glg) | $(DROSS)

qr.tex: README.md config/vars
	@printf '%s' '\qrcode[height=.2\textwidth]{$(QR_TARGET)}' > qr.tex
.switch-gls:
	@touch .switch-gls

output += qr.tex .switch-gls svg-inkscape

images/extracted/:
	mkdir -p $@
	echo '*' > $@.gitignore
images/extracted/inclusion.tex: images/extracted/
	printf '%s\n' '\externaldocument{$(BOOK)}' > $@
	printf '%s\n' '\newcommand\bookTitle{$(TITLE)}' | tr '_' ' ' >> $@

output += images/extracted/

$(DROSS):
	mkdir $(DROSS)

output += $(DROSS)

dependencies = git git-lfs lualatex latexmk inkscape

.PHONY: check
check: ## Check you have the project dependencies
	@$(foreach program, $(dependencies), \
	command -v $(program) >/dev/null || { echo install $(program) && exit 1 ;} ;)

help: ## Print the help message
	@awk 'BEGIN {FS = ":.*?## "} /^[0-9a-zA-Z._-]+:.*?## / {printf "\033[36m%s\033[0m : %s\n", $$1, $$2}' $(MAKEFILE_LIST) | \
		sort | \
		column -s ':' -t

graph: ## Show a dependency graph (needs graph-easy and make2graph)
	make -Bind $(TARG) | make2graph | graph-easy --boxart

print_%.pdf: %.pdf
	pdfjam --landscape --paper a3paper --nup 1x1 --signature 12 $< -o $@

output += $(targets)

.PHONY: all
all: ## All standard targets
	make $(targets)

.PHONY: clean
clean: ## Clean repo, including cross-reference files
	$(RM) -r $(output)