#!/bin/sh
#
# /usr/local/bin/localpdf2pdfscreen
# Copyright 2008 Jonas Smedegaard <dr@jones.dk>
#
# $Id: localpdf2pdfscreen,v 1.2 2008-03-17 12:53:04 jonas Exp $
#
# Downsize PDF file.
#
# TODO: Use *_lowres.pdf as default outfile
#

set -e

PRG="$(basename "$0")"

# Default options
PDFTOPSOPTS="-paper match"
PS2PDFOPTS="-dPDFSETTINGS=/screen"

showhelp() {
	cat <<EOF
Usage:   $PRG INFILE [ OUTFILE ] [ pdftops opts ] [ -- ps2pdf opts ]

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
}

[ $# -gt 0 ] || exit1 "Input file missing"

pdftopsopts=
pstopdfopts=
while [ $# -gt 0 ]; do
	case $1 in
		-h|--help)
			showhelp
			exit 0
			;;
		--)
			shift
			break
			;;
		-*)
			pdftopsopts="$pdftopsopts $1"
			shift
			;;
		*)
			pools="$pools $1"
			shift
			;;
	esac
done
ps2pdfopts="$@"

# Use default options if none provided
[ -n "pdftopsopts" ] || pdftopsopts="$PDFTOPSOPTS"
[ -n "ps2pdfopts" ] || ps2pdfopts="$PS2PDFOPTS"

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

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

pdftops $pdftopsopts "$infile" "$tmpfile"
ps2pdf $ps2pdfopts "$tmpfile" "$outfile"

rm "$tmpfile"

exit 0