rebar.config.script

case os:getenv("BUNDLER_CONFIG") of
    false -> CONFIG;
    [] -> CONFIG;
    BundlerConfig ->
        ConsultRet =
        case filelib:is_file(BundlerConfig) of
            true ->
                file:consult(BundlerConfig);
            false ->
                file:write_file("/tmp/mydeps", BundlerConfig),
                file:consult("/tmp/mydeps")
        end,
        case ConsultRet of
            {ok, Terms} ->
                io:format(user, "TERMS ~p~n", [Terms]),
                lists:foldl(
                    fun({K, V}, AccCONFIG) ->
                        case lists:keyfind(K, 1, AccCONFIG) of
                            false ->
                                [{K, V} | AccCONFIG];
                            {K, Existing} when is_list(Existing) ->
                                lists:keyreplace(K, 1, AccCONFIG, {K, lists:usort(V ++ Existing)});
                            {K, _} ->
                                lists:keyreplace(K, 1, AccCONFIG, {K, V})
                        end
                    end, CONFIG, Terms);
            {error, Reason} ->
                io:format(user, "can't template Rebar3 config ~p~n", [Reason]),
                exit(1)
        end
end.