function add_step() { steps=("${steps[@]}" "$@"); }
function quiet() { "$@" &>/dev/null; }

# c:/dir/sub
function win_fs_path() { echo "$*" | sed 's,\\,/,g'; }

# usage:  smart_wget URL DESTDIR
function smart_wget() {
    _FILE=`basename $1`
    _DLD=`unix_path $2`

    # If the file already exists in the download directory ($2)
    # then don't do anything.  But if it does NOT exist then
    # download the file to the tmpdir and then when that completes
    # move it to the dest dir.
    if [ ! -f $_DLD/$_FILE ] ; then
        wget --passive-ftp -c $1 -P $TMP_DIR
        mv $TMP_UDIR/$_FILE $_DLD
    fi
    LAST_FILE=$_DLD/$_FILE
}

# usage:  wget_unpacked URL DOWNLOAD_DIR UNPACK_DIR
function wget_unpacked() {
    smart_wget $1 $2
    _UPD=`unix_path $3`
    echo -n "Extracting ${LAST_FILE##*/} ... "
    case $LAST_FILE in
        *.zip)     unzip -q -o $LAST_FILE -d $_UPD;;
        *.tar.gz)  tar -xzpf $LAST_FILE -C $_UPD;;
        *.tar.bz2) tar -xjpf $LAST_FILE -C $_UPD;;
        *)         die "Cannot unpack file $LAST_FILE!";;
    esac
    echo "done"
}

function setup() {
    echo
    echo "############################################################"
    echo "###  $*"
    echo "############################################################"
}

function die() {
    echo
    echo "!!! $* !!!"
    echo "!!! ABORTING !!!"
    exit -1
}

# usage: register_env_var NAME SEPARATOR [DEFAULT]
function register_env_var() {
    [ $# -ge 2 -a $# -le 3 ] || die hard
    eval "SEPS_$1"'="'"$2"'"'
    if [ $# -eq 3 ]; then
        eval "$1_BASE=$3"
    else
        eval "$1_BASE"'=$'"$1"
    fi
    eval "$1_ADDS="
    eval export "$1"
    ENV_VARS="$ENV_VARS $1"
}
ENV_VARS=

# usage: add_to_env VALUE NAME
function add_to_env() {
    _SEP=`eval echo '"$'"SEPS_$2"'"'`
    _ENV=`eval echo '"$'"$2"'"'`
    _SED=`eval echo '"s#.*'"${_SEP}$1${_SEP}"'.*##"'`
    _TEST=`echo "${_SEP}${_ENV}${_SEP}" | sed "${_SED}"`
    if [ "$_TEST" ]; then
	if [ "$_ENV" ]; then
	    eval "$2_ADDS"'="'"$1${_SEP}"'$'"$2_ADDS"'"'
	else
	    eval "$2_ADDS"'="'"$1"'"'
	fi
	eval "$2"'="$'"$2_ADDS"'$'"$2_BASE"'"'
    fi
}

function assert_one_dir() {
    [ -d $@ ] || die "Detected multiple directories where only one was expected; please delete all but the latest one: $@"
}

### Local Variables: ***
### mode: shell-script ***
### sh-basic-offset: 4 ***
### tab-width: 8 ***
### End: ***
