#!/bin/sh -e

REQUIRED="pdflatex"
SYNOPSIS="converts markdown-formatted text to PDF, using pdflatex."

### common.sh

### tempdir.sh

texname=output
logfile=$THIS_TEMPDIR/log

pandoc -s -r markdown -w latex "$@" -o $THIS_TEMPDIR/$texname.tex || exit $?

if [ "$OUTPUT" = "-" ]; then
    firstinfile="$(echo $ARGS | sed -ne '1p')"
    firstinfilebase="${firstinfile%.*}"
    destname="${firstinfilebase:-stdin}.pdf"
else
    destname="$OUTPUT"
fi

(
    origdir=$(pwd)
    cd $THIS_TEMPDIR
    TEXINPUTS=$origdir:$TEXINPUTS:
    export TEXINPUTS
    finished=no
    runs=0
    while [ $finished = "no" ]; do
      pdflatex -interaction=batchmode $texname.tex >/dev/null || {
        errcode=$?
        err "${THIS}: pdfLaTeX failed with error code $errcode"
        [ -f $texname.log ] && {
          err "${THIS}: error context:"
          sed -ne '/^!/,/^[[:space:]]*$/p' \
            -ne '/^[Ll]a[Tt]e[Xx] [Ww]arning/,/^[[:space:]]*$/p' \
            -ne '/^[Ee]rror/,/^[[:space:]]*$/p' $texname.log >&2
          if grep -q "File \`ucs.sty' not found" $texname.log; then
            err "${THIS}: Please install the 'unicode' package from CTAN:"
            err "  http://www.ctan.org/tex-archive/macros/latex/contrib/unicode/"
          fi
          if grep -q "File \`fancyvrb.sty' not found" $texname.log; then
            err "${THIS}: Please install the 'fancyvrb' package from CTAN:"
            err "  http://www.ctan.org/tex-archive/macros/latex/contrib/fancyvrb/"
          fi
        }
        exit $errcode
      }
      if [ $runs -lt 3 ] && 
      grep -q "LaTeX Warning: There were undefined references." $texname.log; then
        runs=$(($runs + 1))
        if grep -q "LaTeX Warning:.*[Cc]itation" $texname.log &&
        ! bibtex $texname >/dev/null 2>&1 >bibtex.err; then 
          if [ $runs -gt 2 ]; then
            err "${THIS}: bibtex warning messages:"
            cat bibtex.err
          fi
        fi
      else
        finished=yes
      fi
    done
) || exit $?

is_target_exists=
if [ -f "$destname" ]; then
    is_target_exists=1
    mv "$destname" "$destname~" 
fi

mv -f $THIS_TEMPDIR/$texname.pdf "$destname"

errn "Created $destname"
[ -z "$is_target_exists" ] || {
    errn " (previous file has been backed up as $destname~)"
}
err .