#!/bin/sh

# Script to convert directory of images onto a single PDF
# Software dependencies: pdftk, imagemagick
# Usage: ./imgs2pdf.sh imgs-dir-name pdf-filename
#       if no pdf-filename is provided, output.pdf will the default file name

DIR=""
FILENAME=""
echo ${#1}

if [ ${#1} -gt 0 ] # check arguments given
then
    DIR=$1
    echo "Images from $DIR directory are being converted onto PDF" 

    if [ ${#2} -gt 0 ]
    then
	FILENAME=$2

    else
	FILENAME=output.pdf
    fi
    echo "under the filename: $FILENAME"    
    PROCESS=true    
else
    echo "You forgot to provide the images directory as the first argument"
    PROCESS=false    
fi

if $PROCESS true;
then
    echo "processing..."
    for IMG in $DIR* # convert imgs to tmp pdfs
    do PDF=${IMG%.*}.pdf 
#       convert -density 200 $IMG $PDF
    done
    pdftk $DIR*.pdf cat output $FILENAME # concatonate single pdf into 1 pdf 

fi