#! /bin/sh
LATEX=latex
DVIPS=dvips
GS=gs
COM=/tmp/imagen-com.$$
TMPPNG=/tmp/imagen-tmp-png.$$
RESOLUTION=100 # resolution in dpi
CROP="-trim +repage "
EXTRA=" "
MARGIN="-bordercolor none -border 2 "
TOGIF="-background white -flatten -interlace Plane gif:-"
TOPNG="-interlace Plane -quality 90 png:-"
TOEXT=${TOPNG}
EXT=png
TODIR="."
SVG=false
RM="/bin/rm -f"


while true
do
    case $1 in
     -todir)
       shift
       TODIR="$1"
       mkdir -p ${TODIR} 2> /dev/null || :
       ;;
     -gif)
	TOEXT=${TOGIF}
        EXT=gif
        ;;
     -png)
        TOEXT=${TOPNG}
        EXT=png
        ;;
     -pnm)
        TOEXT="pnm:-"
        EXT=pnm
        ;;
     -svg)
        SVG=true
        ;;
     -quant)
        shift
        echo "Warning: option -quant deprecated" 1>&2
        ;;
    -extra)
        shift
        EXTRA="$1"
        ;;
    -mag)
        shift
	RESOLUTION="$( expr '(' "$1" '*' 100 '+' 999 ')' '/' 1000)"
        ;;
    -res)
        shift
        RESOLUTION="$1"
        ;;
    -t)
        shift
        TPAPER="-t $1"
        ;;
     -pdflatex|-pdf)
         LATEX=pdflatex
       ;;
    -raw)
       EXTRA=''
       MARGIN=''
       TOEXT="pnm:-"
      ;;
    *)
        break
        ;;
    esac
    shift
done
echo "RESOLUTION: $RESOLUTION"

case $1 in
  '')
   BASE=image
   ;;
  *)
   BASE=$1
  ;;
esac
NAME=${BASE}.image

trap "${RM} ${NAME}.dvi ${NAME}.pdf `basename ${NAME}.log` `basename ${NAME}.aux` head.tmp body.tmp ${COM} ${TMPPNG}; exit 2" 1 2 3 8 10 13 15

DVIPSOPTS="-Z $TPAPER"
GSOPTS="-q -dNOPAUSE -dBATCH -dNOPROMPT -sDEVICE=pngalpha \
	-r$RESOLUTION -dAutoRotatePages=/None \
        -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -dDOINTERPOLATE \
        -P- -dSAFER"

CONVERT="cat >${TMPPNG} && convert ${TMPPNG} ${CROP} ${EXTRA} ${MARGIN} ${TOEXT}"
echo ${CONVERT} > ${COM}
if [ "${TODIR}" = "." ]
then
  FINAL=${BASE}%03d.${EXT}
else
  FINAL=${TODIR}/${BASE}%03d.${EXT}
fi
test -f  ${NAME}.tex ||\
{ echo "Failure: no ${NAME}.tex file!" 2>&1 ; exit 2 ; }
${LATEX} ${NAME}.tex
NAMEDIR=`dirname ${NAME}`
if [ "${LATEX}" = "pdflatex" ]
then
  if [ ${NAMEDIR} != "." ]
  then
    mv `basename ${NAME}.pdf` ${NAME}.pdf
  fi
  cat ${NAME}.pdf
else
 if [ ${NAMEDIR} != "." ]
  then
    mv `basename ${NAME}.dvi` ${NAME}.dvi
  fi
  ${DVIPS} ${DVIPSOPTS} -o - ${NAME}.dvi
fi |\
${GS} ${GSOPTS} -sOutputFile="| sh ${COM} > ${FINAL}" -

if $SVG
then
  pdflatex  ${NAME}.tex
  if [ ${NAMEDIR} != "." ]
  then
    mv `basename ${NAME}.pdf` ${NAME}.pdf
  fi
  pdfcrop ${NAME}.pdf ${NAME}.crop.pdf
  pdf2svg ${NAME}.crop.pdf "${TODIR}/${BASE}%03d.svg" all
  ${RM} ${NAME}.crop.pdf
fi

${RM} ${COM} ${TMPPNG} ${NAME}.dvi ${NAME}.pdf  head.tmp body.tmp
${RM} `basename ${NAME}.log` `basename ${NAME}.aux`
