#! @shell@ -e

nixExpr=$1

if test -z "$nixExpr"; then
    echo "syntax: $0 NIX-EXPR..." >&2
    exit 1
fi

extraArgs=
noLink=

for i in "$@"; do
    case "$i" in
        --no-link)
            noLink=1
            ;;
        -*)
            extraArgs="$extraArgs $i"
            ;;
        *)
            storeExprs=$(nix-instantiate "$i")
            for j in $storeExprs; do
                echo "store expression is $j" >&2
            done
            outPaths=$(nix-store -qnfv $extraArgs $storeExprs)
            for j in $outPaths; do
                echo "$j"
                if test -z "$noLink"; then
                    if test -e result; then
                        if ! test -L result; then
                            echo "cannot remove \`result\' (not a symlink)"
                            exit 1
                        fi
                        rm result
                    fi
                    ln -s "$j" result
                fi
            done
            ;;
    esac
done