#!/bin/bash

  TMPDIR=tmp; rm $TMPDIR/*
  LAYERDIR=$TMPDIR
  SLIDEDIR=o/slides ; rm $SLIDEDIR/*.*

  SVG=111009.svg
  IDENTIFIER=111009
  LAYERID=layerid
  SVGDIR=.

  SVGLIST=$TMPDIR/`date +%s`.list
  ls $SVGDIR | grep svg | tail -1 > $SVGLIST


# ---------------------------------------------------------------------- #

separateLayers () {

 GRPOPEN=\<g
 GRPSHUT=\</g\>
 HEADEND=\</metadata\>
 DATE=`date +%y%m%d`; TIME=`date +%H%M%S`

#----------------------------------------------------------------------- #
# FOR EVERY SVG: WRITE LAYERS TO TMP FILES (ONE LAYER -> ONE TMP FILE    #
#----------------------------------------------------------------------- #
for SVG in `cat $SVGLIST`
 do TOTAL=`wc -l $SVGDIR/$SVG  | cut -d ' ' -f 1`; COUNT=1
# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ #
 for GRPSTART in `grep -n $GRPOPEN $SVGDIR/$SVG | cut -d ':' -f 1`
  do
   GRPEND=`cat -n $SVGDIR/$SVG | \
	   sed -n "${GRPSTART},${TOTAL}p" | \
	   grep $GRPSHUT | \
	   cut -f 1 | \
	   head -1`
   ISALAYER=`sed -n "${GRPSTART},${GRPEND}p" $SVGDIR/$SVG | \
	     grep inkscape:groupmode=\"layer\" | \
	     wc -l` 
   if [ $ISALAYER -eq 1 ]; 
    then
        COUNTGRPOPEN=`sed -n "${GRPSTART},${GRPEND}p" $SVGDIR/$SVG | \
		      grep $GRPOPEN | wc -l`
	GRPEND=`cat -n $SVGDIR/$SVG | \
		sed -n "${GRPSTART},${TOTAL}p" | \
		grep $GRPSHUT | \
		cut -f 1 | \
		head -$COUNTGRPOPEN | tail -1`
       NAME=`echo $SVG | cut -d "." -f 1`;

       UNINAME=`echo 0000${COUNT} | rev | cut -c 1-4 | rev`
       UNINAME=${NAME}_${UNINAME}

       echo $UNINAME; COUNT=`expr $COUNT + 1`
       sed -n "${GRPSTART},${GRPEND}p" $SVGDIR/$SVG > $TMPDIR/$UNINAME.layer 
   fi
  done
# ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ #
 done
# ---------------------------------------------------------------------- #
# ADD MISSING CLOSING TAGS (=BUG)                                        #

 for LAYERFILE in `ls $TMPDIR/*.layer`
  do
     COUNTGRPOPEN=`grep $GRPOPEN $LAYERFILE | wc -l`
     COUNTGRPSHUT=`grep $GRPSHUT $LAYERFILE | wc -l`
     TEST=`expr $COUNTGRPOPEN - $COUNTGRPSHUT`
     while [ $TEST -gt 0 ]
      do
         echo $GRPSHUT >> $LAYERFILE
         TEST=`expr $TEST - 1`          
      done
  done
# --------------------------------------------------------------------- #

}

 ######################################################################
 pngFromLayer () {

 IDENTIFIER=$1
 LAYERID=$2

 LAYERLIST=$TMPDIR/layers.list;  rm $LAYERLIST
 SOURCELIST=$TMPDIR/source.list; rm $SOURCELIST

 ########################################
 # WRITE LIST WITH POSSIBLE SOURCES     #
 ########################################
 ls $LAYERDIR/*.layer | \
 grep $IDENTIFIER     		        		>  $SOURCELIST
 ########################################

 if [ `cat $SOURCELIST | wc -l` -le 0 ];then exit 0; fi

 #####################################################################
 # WRITE LIST WITH LAYERS, SORT (TO KEEP ORDER)                      #
 #####################################################################

 for LAYER in `grep -h $LAYERID \`cat $SOURCELIST\` | \
               grep -v XX | sed 's/>//g' | \
               sort`
 do
     SELECTLAYERFILE=`grep -H $LAYER \`cat $SOURCELIST \` | \
                      cut -d : -f 1 | shuf -n 1`
     echo $SELECTLAYERFILE >> $LAYERLIST
 done

 #####################################################################
 # WRITE LAYERS TO A NEW SVG FILE (ONE FILE FOR EACH LAYER )         #
 #####################################################################

  HEADENDLINENUMBER=`cat -n $SVGDIR/$SVG | \
                     grep $HEADEND | \
                     cut -f 1 | \
                     head -1`

  for LAYERFILE in `cat $LAYERLIST | \
                    awk '{FS="_" ; $0=$0 ; print $NF"|"$0}' | \
                    sort -n | cut -d "|" -f 2`
   do
      FILE=${LAYERFILE##*/}
      NAME=${FILE%%.*}
      NEWSVG=$TMPDIR/${NAME}.svg

      ID=`grep $LAYERID $LAYERFILE | cut -d "\"" -f 2`

        if [ `find $TMPDIR -name "${NAME}.svg" | wc -l` -lt 1 ]; then

              head -n $HEADENDLINENUMBER $SVGDIR/$SVG   >  $NEWSVG
              cat $LAYERFILE 				>> $NEWSVG
              echo "</svg>" 				>> $NEWSVG
              sed -i 's/style="display:none"//g' 	   $NEWSVG

	      inkscape --export-png=${SLIDEDIR}/${ID}.png \
		       --export-area-page \
		       --export-background=FFFFFF \
		       --export-text-to-path $NEWSVG
  	fi
    done
}
# ---------------------------------------------------------------------- #

  separateLayers
  pngFromLayer $IDENTIFIER $LAYERID

exit 0;