#!/bin/bash
#
# pdftodjvu version 1.0
# By Murdoch J. Gabbay
#
# Mostly based on the script pdfs2djvu found at http://www.howtoforge.com/creating_djvu_documents_on_linux
#
# See also the any2djvu script; that does not require pdftoppm, cjb2, or djvm --- but it uploads the pdf to a server and converts it there.

function usage
{
echo
echo "pdftodjvu version 1.0"
echo "By Murdoch J. Gabbay, 1 October 2006"
echo
echo "This script converts pdf files to djvu, a viewing format which is more compact and faster to display than pdf."
echo "This script requires pdftoppm, cjb2, and djvm."
echo "This script is based on pdfstodjvu.  See www.gabbay.org.uk for more details."
echo
echo "Usage: pdftodjvu [-c] | [--crop] | [-h] | [--help] [mydocument.pdf]"
echo
echo "pdftodjvu mydocument.pdf will create a djvu version called mydocument.djvu in the current directory."
echo "With the -c or --crop command line option, mydocument.djvu will be cropped to remove white margins (useful for viewing onscreen)."
}

CROP=0
if [ -n "$1" ]; then
  case $1 in
      -c | --crop )           shift
                                CROP=1
                                ;;
      -h | --help | -u | --usage | -?)           usage
                                exit
                                ;;
  esac
fi

if [ -z `which pdftoppm` -o -z `which cjb2` -o -z `which djvm` ]; then
  echo
  echo "-----------------------------------------"
  echo "Error: pdftoppm, cjb2 and djvm are needed"
  echo
  exit 1
fi

shopt -s extglob

DEFMASK="*.pdf"
DPI=600

#if [ -n "$3" ]; then
#  DPI=600
#else
#  DPI=$3
#fi
#echo $DPI

#if [ -n "$2" ]; then
#  OUTFILE=$2
#else
#  OUTFILE="0.djvu"
#fi

if [ -n "$1" ]; then
 PDF=$1
else
  echo
    usage
    echo
    echo "-----------------------------------------"
    echo "Error: you must specify a file that exists, as in 'pdfview mydocument.pdf', and mydocument.pdf is in the current directory."
    echo
    exit 1
fi

DJVU=$(echo "$PDF" | sed -e 's/^\(.*\).pdf$/\1.djvu/')
if [ "$PDF" = "$DJVU" ] ; then
 usage
 echo
 echo "-----------------------------------------"
 echo "Error: $PDF is not a valid input."
 echo "The name of your file must end in .pdf, as in: pdftodjvu mydocument.pdf"
 exit 1
fi

#for PDF in $MASK; do
  if [ ! -e $PDF ]; then
    usage
    echo
    echo "-----------------------------------------"
    echo "Error: I cannot convert $PDF to djvu format, because file $PDF does not exist"
    echo
    exit 1
  fi
  echo Creating djvu from $PDF
  mkdir /tmp/gallerymake-$PDF
  pdftoppm -mono -r 600 -aa yes $PDF /tmp/gallerymake-$PDF/$PDF
  for PBM in /tmp/gallerymake-$PDF/$PDF*.pbm; do
if [ $CROP = "1" ]; then
    echo Trimming $PBM
    convert -trim $PBM $PBM-trim.pbm
    echo Converting $PBM to djvu
    cjb2 -dpi $DPI $PBM-trim.pbm $PBM.djvu
    rm -f $PBM $PBM-trim.pbm
else
    echo Converting $PBM to djvu
    cjb2 -dpi $DPI $PBM $PBM.djvu
    rm -f $PBM
fi
  done
  echo "Assembling $DJVU file for your viewing pleasure."
  djvm -c $DJVU /tmp/gallerymake-$PDF/*.pbm.djvu
  rm -rf /tmp/gallerymake-$PDF
  echo "All done."
#done