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#! @shell@ -e

nixExpr=$1

extraArgs=
addDrvLink=0
addOutLink=1


trap 'rm -f ./.nix-build-tmp-*' EXIT


# Process the arguments.
exprs=
for i in "$@"; do
    case "$i" in

        --help)
            echo "syntax: $0 [NIX-EXPR...]" >&2
            exit 0
            ;;

        --add-drv-link)
            addDrvLink=1
            ;;
            
        --no-link)
            addOutLink=0
            ;;
            
        -*)
            extraArgs="$extraArgs $i"
            ;;
            
        *)
            exprs="$exprs $i"
            ;;
    esac
done

if test -z "$exprs"; then
    exprs="./default.nix"
fi

# Process the specified Nix expressions.
for i in $exprs; do

    # Instantiate the Nix expression.
    prefix=
    if test "$addDrvLink" = 0; then prefix=.nix-build-tmp-; fi
    storeExprs=$(@bindir@/nix-instantiate \
        --add-root ./${prefix}derivation --indirect \
        "$i")
                
    for j in $storeExprs; do
        echo "store expression is $(readlink "$j")" >&2
    done

    # Build the resulting store derivation.
    prefix=
    if test "$addOutLink" = 0; then prefix=.nix-build-tmp-; fi
    outPaths=$(@bindir@/nix-store \
        --add-root ./${prefix}result --indirect \
        -rv $extraArgs $storeExprs)
                
    for j in $outPaths; do
        echo "$(readlink "$j")"
    done
done