#!/bin/sh
#
# $Id$
#
# Convert a conventional GPSD NMEA log file to a JSON log file.
#

celerity=0.001
timeout=

usage () {
    echo "usage : `basename ${0}` [-c celerity] [-t timeout] <input> <output>" 
}

while /bin/true
do

    case $1 in 
    -c) celerity=$2
        shift 2    
        ;; 
    -t) timeout=$2 
        shift 2    
        ;;
    --) break
        ;;
    -*)  
        usage
        exit 64
        ;;
    *)  break
        ;;
    esac
done

if test $# -ne 2
then
    echo "You must sepcify an input and an output file."
    usage
    exit 64
fi

input=$1
output=$2

if test "$timeout" = ""
then
    timeout=$(expr $(stat -c %s $input) / 1048576 + 10),5
fi

echo '*****' gpsfake -1 -c $celerity $input '&'
gpsfake -1 -c $celerity $input &
gpsfake_pid=$!
echo '*****' gpsclient -q -t $timeout -l $output
gpsclient -q -t $timeout -l $output
echo '***** gpsclient finished, killing gpsfake with PID '$gpsfake_pid'...'
kill $gpsfake_pid
echo '***** Waiting for gpsfake to finish...'
wait
echo '***** gpsfake finished, leaving.'