.PHONY: default all clean version.tex dvi

ifeq ($(OS),Windows_NT)
SHELL := powershell.exe
.SHELLFLAGS := -NoProfile -ExecutionPolicy Bypass -Command
endif

# Default top-level LaTeX to generate
DEFAULTTOPTEX = hott-online.tex

# Top-level LaTeX files from which HoTT book can be generated
TOPTEXFILES = $(DEFAULTTOPTEX) hott-bilingual.tex hott-ustrade.tex hott-letter.tex hott-letter-exercises.tex hott-a4.tex hott-a4-exercises.tex hott-ebook.tex hott-ebook-wide.tex hott-ebook-narrow.tex hott-arxiv.tex

# LaTeX files that actually comprise the book
# (that is, all of them except configuration)
BOOKTEXFILES = 	main.tex \
	macros.tex \
	version.tex \
	frontpage.tex \
	front.tex \
	preface.tex \
	introduction.tex \
	preliminaries.tex \
	basics.tex \
	logic.tex \
	equivalences.tex \
	induction.tex \
	hits.tex \
	hlevels.tex \
	homotopy.tex \
	categories.tex \
	setmath.tex \
	reals.tex \
	formal.tex \
	symbols.tex \
	back.tex \
	blurb.tex

# Configuration files
OPTFILES = opt-letter.tex \
	   opt-a4.tex \
	   opt-ustrade.tex \
	   opt-ebook.tex \
	   opt-ebook-wide.tex \
	   opt-ebook-narrow.tex \
	   opt-color.tex \
	   opt-black-white.tex \
	   opt-cover.tex \
	   opt-no-cover.tex \
	   opt-bastard.tex \
	   opt-no-bastard.tex

# Image files
LORESPNGFILES = cover-lores-back-bw.png \
		cover-lores-back.png \
		cover-lores-front-bw.png \
		cover-lores-front.png \
		cover-lores.png \
		torus-lores-bw.png
HIRESPNGFILES = cover-hires-back-bw.png \
		cover-hires-back.png \
		cover-hires-front-bw.png \
		cover-hires-front.png \
		cover-hires.png \
		cover-hires-bw.png \
		torus-hires-bw.png

# All the LaTeX files for the HoTT book in order of dependency
TEXFILES = $(TOPTEXFILES) $(BOOKTEXFILES) $(OPTFILES)

# aux files to be used when combining info from HoTT book with
# exercises
BOOKAUXFILES := $(BOOKTEXFILES:.tex=.aux)

# PDF and DVI files corresponding to HoTT book files
TOPPDFFILES:=$(TOPTEXFILES:.tex=.pdf)
TOPDVIFILES:=$(TOPTEXFILES:.tex=.dvi)

# Default PDF file to make
DEFAULTPDF:=$(DEFAULTTOPTEX:.tex=.pdf)

default: $(DEFAULTPDF)

all: $(TOPPDFFILES) exercise_solutions.pdf errata.pdf cover-lulu-hardcover.pdf cover-lulu-paperback.pdf cover-letter.pdf cover-a4.pdf

dvi: $(TOPDVIFILES) exercise_solutions.dvi errata.dvi cover-lulu-hardcover.dvi cover-lulu-paperback.dvi cover-letter.dvi cover-a4.dvi

# Main targets
ifeq ($(OS),Windows_NT)
$(TOPPDFFILES) : %.pdf : %.tex $(TEXFILES) references.bib cover-lores-front.png cover-lores-back.png
	if (Get-Command latexmk -ErrorAction SilentlyContinue) { latexmk -interaction=batchmode -g -pdf "$<" } else { Write-Host "run 1: pdflatex $<"; pdflatex -halt-on-error -interaction=batchmode "$<" *> $$null; bibtex "$(patsubst %.tex,%,$<)"; makeindex "$(patsubst %.tex,%,$<)"; Write-Host "run 2: pdflatex $<"; pdflatex -halt-on-error -interaction=batchmode "$<" *> $$null; pdflatex -halt-on-error "$<"; Write-Host "HINT: If you think this took a long time you should install latexmk." }

$(TOPDVIFILES) : %.dvi : %.tex $(TEXFILES) references.bib cover-lores-front.png cover-lores-back.png
	if (Get-Command latexmk -ErrorAction SilentlyContinue) { latexmk -interaction=batchmode -dvi "$<" } else { Write-Host "run 1: latex $<"; latex -halt-on-error -interaction=batchmode "$<" *> $$null; bibtex "$(patsubst %.tex,%,$<)"; makeindex "$(patsubst %.tex,%,$<)"; Write-Host "run 2: latex $<"; latex -halt-on-error -interaction=batchmode "$<" *> $$null; latex -halt-on-error "$<"; Write-Host "HINT: If you think this took a long time you should install latexmk." }
else
$(TOPPDFFILES) : %.pdf : %.tex $(TEXFILES) references.bib cover-lores-front.png cover-lores-back.png
	if which latexmk > /dev/null 2>&1 ;\
	then latexmk -interaction=batchmode -g -pdf $< ;\
	else (echo "run 1: pdflatex $<"; pdflatex -halt-on-error -interaction=batchmode $< 2>&1 >/dev/null) && \
	     bibtex $(patsubst %.tex,%,$<) && \
	     makeindex $(patsubst %.tex,%,$<) && \
	     (echo "run 2: pdflatex $<"; pdflatex -halt-on-error -interaction=batchmode $< 2>&1 >/dev/null) ;\
	     pdflatex -halt-on-error $< ;\
	     echo "HINT: If you think this took a long time you should install latexmk." ;\
	fi

$(TOPDVIFILES) : %.dvi : %.tex $(TEXFILES) references.bib cover-lores-front.png cover-lores-back.png
	if which latexmk > /dev/null 2>&1 ;\
	then latexmk -interaction=batchmode -dvi $< ;\
	else (echo "run 1: latex $<"; latex -halt-on-error -interaction=batchmode $< 2>&1 >/dev/null) && \
	     bibtex $(patsubst %.tex,%,$<) && \
	     makeindex $(patsubst %.tex,%,$<) && \
	     (echo "run 2: latex $<"; latex -halt-on-error -interaction=batchmode $< 2>&1 >/dev/null) ;\
	     latex -halt-on-error $< ;\
	     echo "HINT: If you think this took a long time you should install latexmk." ;\
	fi
endif

all default: log-check
log-check:
ifeq ($(OS),Windows_NT)
	if (Test-Path hott-online.ilg) { if (Select-String -Path hott-online.ilg -SimpleMatch "!! Input index error") { Write-Host "Indexing error detected in hott-online.ilg"; exit 1 } }
else
	: check for indexing errors
	! grep -n "!! Input index error" hott-online.ilg /dev/null
endif

version.tex:
ifeq ($(OS),Windows_NT)
	$$ver = (git describe --always --long).Trim(); "\newcommand{\OPTversion}{$$ver}" | Out-File -Encoding ascii version.tex
else
	printf '\\newcommand{\\OPTversion}{%s}\n' "`git describe --always --long`" > version.tex
endif

# these warnings are mostly spurious, and could have been prevented by a better makeindex algorithm
log-check-for-warnings:
ifeq ($(OS),Windows_NT)
	if (Test-Path hott-online.ilg) { if (Select-String -Path hott-online.ilg -SimpleMatch "## Warning") { Write-Host "Index warning detected in hott-online.ilg" } }
else
	: check for indexing warnings
	- ! grep -n "## Warning" hott-online.ilg /dev/null
endif

$(BOOKAUXFILES) : %.aux : %.tex
	echo "WARNING: assuming $@ is up-to-date"

# Generate labels for the solutions
main.labels: $(BOOKAUXFILES)
ifeq ($(OS),Windows_NT)
	Get-Content $^ | Select-String -Pattern '^\\newlabel' | ForEach-Object { $$_.Line } | Out-File -Encoding ascii $@
else
	cat $^ | grep ^.newlabel >$@
endif

# Extract label numbers for verifying that they haven't changed within an edition.
# Discard symbol index numbers (not seen by user) and page numbers (we don't care about them).
main.labelnumbers: main.labels
	sed 's/.*symindex.*//g' main.labels | sed 's/{\({[^}]*}\).*/\1/g' | sort >main.labelnumbers

# Check that no labels have changed, by making sure that all label
# numbers from the first edition are still present
labelcheck: main.labelnumbers
	diff -u main.labelnumbers.first-edition main.labelnumbers | grep '^-\\newlabel' && echo Some label numbers have changed since the first edition!

ifeq ($(OS),Windows_NT)
cover-lulu-hardcover.pdf cover-lulu-paperback.pdf cover-letter.pdf cover-a4.pdf exercise_solutions.pdf errata.pdf : %.pdf : %.tex
	if (Get-Command latexmk -ErrorAction SilentlyContinue) { latexmk -interaction=batchmode -pdf "$<" } else { pdflatex -halt-on-error "$<" }
else
cover-lulu-hardcover.pdf cover-lulu-paperback.pdf cover-letter.pdf cover-a4.pdf exercise_solutions.pdf errata.pdf : %.pdf : %.tex
	if which latexmk > /dev/null 2>&1 ;\
	then latexmk -interaction=batchmode -pdf $<;\
	else pdflatex -halt-on-error $<; fi
endif

ifeq ($(OS),Windows_NT)
cover-lulu-hardcover.dvi cover-lulu-paperback.dvi cover-letter.dvi cover-a4.dvi exercise_solutions.dvi errata.dvi : %.dvi : %.tex
	if (Get-Command latexmk -ErrorAction SilentlyContinue) { latexmk -interaction=batchmode -dvi "$<" } else { latex -halt-on-error "$<" }
else
cover-lulu-hardcover.dvi cover-lulu-paperback.dvi cover-letter.dvi cover-a4.dvi exercise_solutions.dvi errata.dvi : %.dvi : %.tex
	if which latexmk > /dev/null 2>&1 ;\
	then latexmk -interaction=batchmode -dvi $<;\
	else latex -halt-on-error $<; fi
endif

cover-lulu-hardcover.pdf cover-lulu-paperback.pdf cover-lulu-hardcover.dvi cover-lulu-paperback.dvi: cover-hires.png $(OPTFILES)

cover-letter.pdf cover-a4.pdf cover-letter.dvi cover-a4.dvi: cover-lores-front.png cover-lores-back.png $(OPTFILES)

hott-arxiv.tex: hott-online.tex main.tex
ifeq ($(OS),Windows_NT)
	$$enc = New-Object System.Text.UTF8Encoding($$false); $$header = '% hott-arxiv.tex AUTOGENERATED FROM hott-online.tex AND main.tex'; $$text = @($$header) + (Get-Content hott-online.tex); $$text = ($$text -replace '\\input\{main\}',''); $$text += Get-Content main.tex; [System.IO.File]::WriteAllLines('hott-arxiv.tex', $$text, $$enc)
else
	echo '% hott-arxiv.tex AUTOGENERATED FROM hott-online.tex AND main.tex' >hott-arxiv.tex
	cat hott-online.tex >>hott-arxiv.tex
	sed 's/\\input{main}//' <hott-arxiv.tex >hott-arxiv.tex.tmp
	mv hott-arxiv.tex.tmp hott-arxiv.tex
	cat main.tex >>hott-arxiv.tex
endif

hott-arxiv.tar.gz: hott-arxiv.pdf
	tar -czf hott-arxiv.tar.gz hott-arxiv.tex hott-arxiv.bbl hott-arxiv.ind $(BOOKTEXFILES) $(OPTFILES) $(LORESPNGFILES) mathpartir.sty

exercise_solutions.pdf exercise_solutions.dvi: main.labels

errata.pdf errata.dvi: version.tex main.labels

clean:
ifeq ($(OS),Windows_NT)
	Remove-Item -Force -ErrorAction SilentlyContinue *~; Remove-Item -Force -ErrorAction SilentlyContinue *.aux; $$prefixes = @('exercise_solutions','errata'); $$exts = @('out','log','pdf','dvi','fls','fdb_latexmk','aux','brf','bbl','idx','ilg','ind','toc','sed'); foreach ($$p in $$prefixes) { foreach ($$e in $$exts) { Remove-Item -Force -ErrorAction SilentlyContinue "$$p.$$e" } }; foreach ($$e in $$exts) { Remove-Item -Force -ErrorAction SilentlyContinue "hott-*.$$e" }; if (Get-Command latexmk -ErrorAction SilentlyContinue) { latexmk -interaction=batchmode -C hott-*.tex }
else
	rm -f *~ *.aux {exercise_solutions,errata,hott-*}.{out,log,pdf,dvi,fls,fdb_latexmk,aux,brf,bbl,idx,ilg,ind,toc,sed}
	if which latexmk > /dev/null 2>&1 ; then latexmk -interaction=batchmode -C hott-*.tex; fi
endif

# list the tex files explicitly because:
#   - we want to tag them in the same order they appear in the book, so tag search is in logical sequence
#   - there are many *.tex garbage files in this directory
TAGS: $(TEXFILES) exercise_solutions.tex errata.tex
	etags $^ -o $@.tmp
	mv $@.tmp $@

indexterms.txt:					\
	other/index-helper.py			\
	front.tex				\
	preface.tex				\
	introduction.tex			\
	preliminaries.tex			\
	basics.tex				\
	logic.tex				\
	equivalences.tex			\
	induction.tex				\
	hits.tex				\
	hlevels.tex				\
	homotopy.tex				\
	categories.tex				\
	setmath.tex				\
	reals.tex				\
	formal.tex
		other/index-helper.py >$@