#!/bin/sh

# Script converts first page of PDFs to a jpeg with the ending _cover.jpeg
# Software dependencies: gs
# Usage: ./pdf_cover.sh imgs-dir-name

DIR=""
echo ${#1}

if [ ${#1} -gt 0 ] # check arguments given
then
    DIR=$1
    echo "PDF from $DIR directory: cover converted to png"

    for f in $DIR/*.pdf # convert imgs to tmp pdfs
    do
	COVER=$DIR/`basename "$f" .pdf`_cover.jpeg
	echo $COVER
	gs -q -dNOPAUSE -dSAFER  -dBATCH -sDEVICE=jpeg -r300x300 -sOutputFile="$COVER" -dLastPage=1 "$f"
#       convert "$f"[0] "$COVER"
    done
#    pdftk $DIR*.pdf cat output $FILENAME # concatonate single pdf into 1 pdf 
else
    echo "You forgot to provide the PDFs directory as first argument"
fi