generates raster pdf script

pdf2imgpdf.sh

#/bin/sh
set -eu

for exe in "gs" "gm" "pdftoppm" "mktemp" ; do
    which "$exe" >/dev/null
    if [ $? -ne 0 ]; then
        exit 1
    fi
done

help() {
    echo "
pdf2imgpdf: generates raster pdf

usage: pdf2imgpdf [input file] [output file's prefix]

option:
-h show this message
-o specifies output file's name
" 1>&2
    exit 0
}

DIR=$(mktemp -d)
current=$(pwd)
SANITIZED_DIR=$(echo $DIR | sed 's/\//\\&/g' | sed 's/\./\\./g')

while getopts ho: OPTION; do
    case $OPTION in
        h) help ;;
        o) OUTPUTFILE=$OPTARG;;
    esac
done

if [ $OUTPUTFILE ] ; then
    $OUTPUTFILE="$2-img-optimized.pdf"
fi

pdftoppm -png "$1" "$DIR/$2"
gm convert -page A4+0+0 $(ls "$DIR" | grep -E "$2-[0-9]+.png" | sed "s/^/$SANITIZED_DIR\//") "$DIR/$2-img.pdf"
gs -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 \
    -dPDFSETTINGS=/printer \
    -sOutputFile="$DIR/$OUTPUTFILE" \
    "$DIR/$2-img.pdf"
cp "$DIR/$OUTPUTFILE" "$current/"