#!/bin/bash

print_usage()
{
    echo "$(basename $0) -- PDF rotate."
    echo "Usage: $(basename $0) [OPTIONS...] INPUT-FILE"
    echo "Options:"
    echo "  -h   display this help and exit"
}

if [ "x${1}" = "x--help" ]; then
    print_usage
    exit 1
fi

if [ ${#} -ne 1 ]; then
    echo "Missing input filename"
    print_usage
    exit 1
fi

src="${1}"

temp=$(mktemp)

gs -sDEVICE=pdfwrite -sOutputFile=${temp} -dNOPAUSE -dBATCH -dEPSCrop \
   -c "<</Orientation 2>> setpagedevice" -f ${src}

if [ ${?} -eq 0 ]; then
    mv ${temp} ${src}
else
    rm${temp}
fi