#!/bin/bash
# This job script takes a nap for 10 seconds (or paramter $2) every 30 minutes (or paramter $1)

# SGE options
#$ -N PSleeper
#$ -l scf=1M,mem=100M,h_vmem=100M
#$ -q normal.q
#$ -cwd

# process args
case "$1" in
    -h)
        echo "usage: $0 [-h | [-d] [T] [nap]]"
        echo "periodically take a nap"
        echo ""
        echo "-h   print this help and exit"
        echo "-d   print debug info"
        echo "T    take a nap every T minutes (default: 30)"
        echo "nap  take a nap for nap seconds (default: 10)"
        exit 1
        ;;
    *)
        debug=0
        terse="-terse"
        debug_flag=""
        do_echo=0
        T=30
        nap=10
        while (( "$#" )); do
            case "$1" in
                -d)
                    debug=1
                    terse=""
                    debug_flag="-d"
                    do_echo=1
                    ;;
                *)
                    T=${1:-30}
                    nap=${2:-10}
                    break
                    ;;
            esac
            shift
        done
        ;;
esac

# set other variables
next=$(date -d "${T} minutes" +%Y%m%d%H%M)
script=$0

# output some informations
if [ ${debug} -eq 1 ]; then
    echo "T = ${T}, nap=${nap}"
    echo "next run at ${next} (YYYYMMDDhhmm)"
    echo "debug_flag = ${debug_flag}, do_echo = ${do_echo}"
    echo ""
fi

# commands to run in Grid Engine
${script} ${nap} ${do_echo}

# re-submit script to execute in T minutes
jobid=$(qsub ${terse} -a ${next} ${script} ${debug_flag} ${T} ${nap})
exit_code=$?
if [ ${debug} -eq 1 ]; then
    echo "${jobid}"
fi
if [ ${exit_code} -ne 0 ]; then
    if [ ${debug} -eq 1 ]; then
        echo "${jobid}"
        echo "Ups, something went wrong, check output!"
    fi
    exit ${exit_code}
fi