#!/bin/bash
set -e
LATEXFLAGS="-file-line-error -halt-on-error"

docs=( thesis presentation )

log(){
	echo $1 >&2
}

deps(){
	[[ "$1" != *.tex && "$1" != *.pre ]] && fn="$1.tex" || fn="$1"
	echo "$fn"
	grep -Po '(?<=\\input{).*(?=})|(?<=\\include{).*(?=})' $fn |\
		while read l; do deps "$l"; done
}

graphicdeps(){
	grep -Pzo '\\includegraphics[%\t\n ]*(\[.*\])?[%\t\n ]*\{.*?\}' $1 |\
		tr '\0' '\n' | grep -Po '(?<=\{).*?(?=\})' |\
		while read l; do echo "$2/$l"; done
}

graphicspath(){
	:
}

recompile(){
	for dep in $(deps "$1"); do
		if [ "$dep" -nt "$2" ]; then
			log "$dep is newer than $2, thus recompiling"
			return 0
		fi
	done
	return 1
}

preamble(){
	pdflatex $LATEXFLAGS -ini -jobname="$2" "&pdflatex $1\dump"
	ret=$?
	rm -f $2.pdf
	[ $ret -ne 0 ] && exit 1
}

compile(){
	pdflatex $LATEXFLAGS $1 || exit 1

	if grep -q '^\\bibdata{' $1.aux
	then bibtex $1 || exit 1
	fi

	if grep -q '\@istfilename' $1.aux
	then makeglossaries $1 || exit 1
	fi

	if [ -f $1.idx ]
	then makeindex $1 || exit 1
	fi

	tmpf=$(mktemp)
	pdflatex $LATEXFLAGS $1 | tee $tmpf || exit 1

	if grep -Fiq "Rerun" $tmpf
	then pdflatex $LATEXFLAGS $1 || exit 1
	fi

	rm -vf $tmpf
}

pipeline(){
	log "Processing $1"
	if [ ! -f $1.tex ]; then
		log "Skipping $1, no tex available"
	else
		# Check for preamble
		[ -f preamble.tex ] && pre=preamble.tex
		[ -f $1.pre ] && pre=$1.pre

		if [ ! -z $pre ]; then
			log "preamble found"
			recompile $pre $1.fmt\
				&& preamble $pre $1\
				|| log "preamble up to date"
		fi
	
		# Compile document
		recompile "$1.tex" "$1.pdf"\
			&& compile $1\
			|| log "document up to date"
	fi
}

clean(){
	while [ $# -ne 0 ]; do 
		log "Clean $1"
		rm -fv $1.{acn,acr,alg,aux,bbl,blg,idl,idx,ilg,ind,fmt,glg,glo,gls,\
ist,loa,lof,log,lol,lot,nav,out,pdf,snm,tdo,toc,vrb}
		shift
	done
}

if [ $# -eq 0 ]; then
	for doc in "${docs[@]}"; do
		pipeline $doc
		log ""
	done
else
	while [ $# -ne 0 ]; do
		if [ $1 = "clean" ]; then
			if [ $# -eq 2 ];
			then clean $d
			else clean "${docs[@]}"
			fi
		else
			pipeline $1
		fi
		shift
	done
fi