#!/bin/sh
#		    by Nick (with some input from Davide) - v. 3.6 - Dec 2023
# usage: latexcontinuo [options] file.tex
# keeps upgraded the file.pdf
# just save from your $EDITOR and the thing compiles by itself
# -h : print this help


case $# in
0)	head -6 $0 1>&2
        exit 1
esac

dvioptions="-z -Ppdf -G0"
pdfoption="y"
pdflatexoptions="-halt-on-error -file-line-error -synctex=1"

sleeptime=2  # waiting time after successful compilation
sleeperror=6 # waiting longer in case compilation fails with some error

for i in $*
do
	case $i in
		-h)	head $0; exit;;
		*)	name=$i
	esac
done
#		-l)	dvioptions=$dvioptions" -t landscape";;
#		-p)	pdfoption="n";;

name=`basename $name .tex`
dirn=`dirname $name`
f="$dirn/$name.tex"
log_file="$dirn/$name.log"
pdf_file="$dirn/$name.pdf"
#unwanted="$dirn/$name.nav"  # will keep these file(s) empty

run_latex () {
    pdflatex $pdflatexoptions "$f" < /dev/null
    returnvalue=$?
#   cp /dev/null $unwanted
    if grep "Rerun to get cross-references right" "$log_file" > /dev/null
    then
        run_latex
    fi
    return $returnvalue
}

if (test -n $f) then 
    echo "
        LaTex source: $f        target: $pdf_file"
    iter=0
    while test $iter -le 10000	# latexcontinuo stops after a while...
    do
	sync		# may be useful when working on a NFS
	if test `ls -t $f $log_file | head -1` = $f ; then
	    if(run_latex) then
	        sleep $sleeptime
	    else
		sleep $sleeperror
	    fi
	    iter=0
	else
	    sleep $sleeptime		# the latency time in seconds
        fi
	iter=`expr $iter + 1`
    done
else
    echo "file $f not found"
fi