#!/usr/bin/env bash
# vim: tabstop=4 shiftwidth=4 expandtab
usage() {
    echo "usage: source $(basename ${BASH_SOURCE[0]}) {release}" >&2
}

if [ "${BASH_SOURCE[0]}" -ef "$0" ]; then
    echo "ERROR: This script is not designed to be executed." >&2
    usage
    exit 1
fi

topdir="$( dirname $(cd $(dirname ${BASH_SOURCE[0]}) && pwd) )"
datadir="${topdir}/share"
spexdir="${topdir}/spex"

spextool_version="$1"
if [ -z "$spextool_version" ]; then
    usage
    return 1
fi

root="${spexdir}/${spextool_version}"
if [ ! -d "$root" ]; then
    echo "$spextool_version is not installed" >&2
    return 1
fi

if [ -n "$IDL_PATH" ] && [ -z "$IDL_PATH_OLD" ]; then
    IDL_PATH_OLD="$IDL_PATH"
    export IDL_PATH_OLD
else
    IDL_PATH_OLD="+$IDL_DIR"
    export IDL_PATH_OLD
fi

paths="+${datadir}:+${root}"
if ! [[ "$IDL_PATH" =~ .*"$paths".* ]]; then
    unset IDL_PATH
    if [[ "$IDL_PATH_OLD" == "+${IDL_DIR}" ]]; then
        IDL_PATH="${paths}:${IDL_PATH_OLD}"
    else
        IDL_PATH="${paths}:${IDL_PATH_OLD}:+${IDL_DIR}"
    fi 
fi
export IDL_PATH