#!/bin/sh

_init() {
    variables=(
        "G4ABLADATA" \
            "G4ENSDFSTATEDATA" \
            "G4INCLDATA" \
            "G4LEDATA" \
            "G4LEVELGAMMADATA" \
            "G4NEUTRONHPDATA" \
            "G4PARTICLEXSDATA" \
            "G4PIIDATA" \
            "G4RADIOACTIVEDATA" \
            "G4REALSURFACEDATA" \
            "G4SAIDXSDATA" \
            )

shell=("sh" "csh")

existing_out="existing_out" # out-of-source compilation
existing_in="existing_in"   # in-source compilation
path="/usr/bin"
}
_clean(){
    for _ext in ${shell[*]}
    do
        rm -f $existing_out.${_ext}
        rm -f $existing_in.${_ext}
    done
}
_read() {
    _init
    for _varname in ${variables[*]}
    do
        for _ext in ${shell[*]}
        do
            if [ -f ${path}/geant4.${_ext} ]; then
                sed -n /${_varname}/p ${path}/geant4.${_ext}     >> $existing_out.${_ext}
            fi
            if [ -f ${path}/geant4make.${_ext} ]; then
                sed -n /${_varname}/p ${path}/geant4make.${_ext} >> $existing_in.${_ext}
            fi
	done
    done
}
_keep() {
    _init
    for _ext in ${shell[*]}
    do
        cat $existing_out.${_ext} >> ${path}/geant4.${_ext}
        cat $existing_in.${_ext}  >> ${path}/geant4make.${_ext}
    done
    _clean
}

pre_upgrade() {
    _read
}
post_upgrade() {
    _keep
}