%% -*- erlang -*-
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1998-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%%     http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%

%% Run like:
%%   $ERL_TOP/bin/escript erts/emulator/utils/loaded

-mode(compile).

main(_) ->
    LibDir = code:lib_dir(),
    io:format("Library root is ~s\n", [LibDir]),
    Wc = filename:join(LibDir, "*/ebin/*.beam"),
    Beams = filelib:wildcard(Wc),
    BeamFileSize = lists:sum([filelib:file_size(Beam) || Beam <- Beams]),
    io:format("~w BEAM files containing ~w bytes\n",
	      [length(Beams),BeamFileSize]),
    Ms = [list_to_atom(filename:rootname(filename:basename(Beam))) ||
	     Beam <- Beams],
    [{module,_} = code:ensure_loaded(M) || M <- Ms],
    <<"Current code: ",T/binary>> = erlang:system_info(loaded),
    Digits = grab_digits(T),
    io:format("~w modules comprising ~s words when loaded\n",
	      [length(Ms),Digits]).

grab_digits(<<H,T/binary>>) when $0 =< H, H =< $9 ->
    [H|grab_digits(T)];
grab_digits(<<$\n,_/binary>>) -> [].