#!/bin/bash

#########################################################################
# PDF2DJVU version 0.10 -- Converts a PDF file to a DJVU file.
# (Optional 2nd argument says how many degrees to use to rotate CCW)
#
# Copyright 2005 Jonathan Hanke            
# Original Author: Jonathan Hanke
# Last updated by Jonathan Hanke on Dec 13, 2005 
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA
#########################################################################


# Make the temporary directory
tmp_dir="/tmp/`basename $1`"
if ! [ -d $tmp_dir ]; then 
    mkdir $tmp_dir
fi


# Find the number of pages in the pdf file
num_of_pages=`pdfinfo $1 | grep Pages: | sed 's/Pages://; s/[ \t]*//'`
echo "There are $num_of_pages pages in the PDF file."


# UNUSED:
# -------    
# Extract the pages to 300dpi ppm files
##gs -q -r300 -dNOPAUSE -dBATCH -dSAFER -sDEVICE=ppmraw -sOutputFile=$tmp_dir/tmp%04d -- $1   ## This extracts all of the pages at once!

for num in `seq -w 1 $num_of_pages`;
  do 

  if [ -e $tmp_dir/$num.djvu ]; then 
      echo "  Found page " $num " -- " $(date)

  else
      
      echo "  Generating page " $num " -- " $(date)
      
      # Extract the current page
      gs -q -r300 -dNOPAUSE -dBATCH -dSAFER -sDEVICE=ppmraw -dFirstPage=$num -dLastPage=$num -sOutputFile=$tmp_dir/newpage_$num -- $1   
      ## pdftoppm -r 300 -f $num -l $num  $1  $tmp_dir/newpage_$num    ## This one made huge files!
      ## pdftoppm -r 150 -f $num -l $num  $1  $tmp_dir/newpage_$num   ## USING THIS ONE!
      ## pdftoppm -r 100 -f $num -l $num  $1  $tmp_dir/newpage_$num  ## Not much difference from 100 interms of size, so we'll stay with 150!

      # Rotate CCW by the number of degrees in the second argument!
      if [ $# = 1 ]; then
	  ## echo "    No extra operations!"
	  sleep 0   #Dummy command
      else
	  ## echo "    Rotating clockwise by $2 degrees!"
	  convert -rotate $2 $tmp_dir/newpage_$num $tmp_dir/newpage_$num-rot$2.ppm
	  rm -f $tmp_dir/newpage_$num         # Needed to ensure that we only convert the rotated image!
      fi

      # Convert it to djvu format, then remove it
      for i in $tmp_dir/newpage_$num*; do
	  cpaldjvu -dpi 300 $i $tmp_dir/$num.djvu 
	  rm -f $i
      done 
      
  fi
  
done


# Assemble the multi-page djvu document
djvu_filename=$(echo $1 | sed 's/\(.*\.\)pdf/\1djvu/')    # This is the filename with .pdf replaced by .djvu
djvm -c $djvu_filename $tmp_dir/*.djvu


# Clean up 
rm -rf $tmp_dir