#!/bin/sh

set -e

PRG="$0"

showhelp() {
	cat <<EOF
Usage:   $PRG INFILE [ OUTFILE ]

If missing, OUTFILE is INFILE.pdf (ie. double pdf extension).

Examples:
    $PRG newspaper.pdf newspaper_screenready.pdf

EOF
}

exit1() {
	echo >&2 "ERROR: $1"
	exit 1
}

if [ $# -eq 0 ]; then
	showhelp
	exit1 "Not enough parameters"
fi


infile="$1"
tmpfile=$(mktemp -t "$PRG.XXXXXXXXXX") || exit 1
outfile="${2:-$infile.pdf}"

[ ! -e "$outfile" ] || exit1 "Output file already exists"

pdftops -paper match "$infile" "$tmpfile"
ps2pdf -dPDFSETTINGS=/screen "$tmpfile" "$outfile"