#!/usr/bin/env bash
u1=$(date +"%s") # epoch time of program start
echo -e "\nShellscript (bash) $0"
echo "(checks LaTeX code, without PDF output)"

# assert that you may run the program pdflatex
if [ ! -x "/usr/bin/pdflatex" ] ; then
    echo "FEHLER 1: Programm pdflatex fehlt !"
    exit 1
fi

# path to latex file (either given or default)
if [ $# -eq 0 ]; then # not given, use default
    pfad="/home/ahg/latex/myfi.tex"  # default
elif [ $# -eq 1 ]; then
    pfad=$1  # given file
    if [[ ! $pfad == *.tex ]] ; then
      echo "FEHLER 2: Ohne Dateiendung .tex !"
      exit 2
    fi
else
    echo "FEHLER 3: Zu viele Argumente (>1) !"
    exit 3
fi

# exit with error if file datei does not exist
if [ ! -f $pfad ] ; then
    echo "FEHLER 4: Die Datei gibt es nicht !"
    exit 4
fi

# extract directory and file name without .tex
vrz=$(dirname "${pfad}") # directory
dat=$(basename "${pfad}") # file
datohne="${dat%.*}"   # file name without .tex

# call pdflatex
echo -e "\npdflatex auf Fehlersuche:"
aux="${vrz}/${datohne}.log"
pdflatex -output-directory ${vrz} -draftmode \
-interaction=batchmode ${pfad} 2>&1 > /dev/null
# show shortened result of pdflatex
if [ $? = 0 ] ; then echo -e "\nOhne Fehler !"
    cat ${aux} | grep "Warning"
else
    echo -e "\nFehler! (l. = line number)"
    cat ${aux} | grep -m 1 -A 2 "^!"
fi

# delete all auxiliary files
aux="${vrz}/${datohne}.aux"
if [ -f "${aux}" ] ; then rm "${aux}" ; fi
aux="${vrz}/${datohne}.bcf"
if [ -f "${aux}" ] ; then rm "${aux}" ; fi
aux="${vrz}/${datohne}.idx"
if [ -f "${aux}" ] ; then rm "${aux}" ; fi
aux="${vrz}/${datohne}.log"
if [ -f "${aux}" ] ; then rm "${aux}" ; fi
aux="${vrz}/${datohne}.out"
if [ -f "${aux}" ] ; then rm "${aux}" ; fi
aux="${vrz}/${datohne}.run.xml"
if [ -f "${aux}" ] ; then rm "${aux}" ; fi
aux="${vrz}/${datohne}.toc"
if [ -f "${aux}" ] ; then rm "${aux}" ; fi

u2=$(date +"%s") # epoch time of program stop
echo -e "\nEnd after $(expr $u2 - $u1) seconds."