rebar.config.script

% vim: set ft=erlang expandtab softtabstop=4 shiftwidth=4:
%% define a -Ddebug macro if a debug build was requested
CONFIG1 = case os:getenv("DEBUG") of
            "true" ->
                % get the current erl_opts and add the debug define
                NewErlOpts = proplists:get_value(erl_opts, CONFIG) ++ [{d, debug}],
                % now replace the new erl opts in the current rebar configuration
                CONFIG0 = lists:keyreplace(erl_opts, 1, CONFIG, {erl_opts, NewErlOpts}),
                % also get the current port spec opts
                [{Pattern0, Target0, Sources0, PortSpecOpts0}] =
                    proplists:get_value(port_specs, CONFIG),
                [{"CFLAGS", Cflags0}] = proplists:get_value(env, PortSpecOpts0),
                NewPortSpecOpts0 = [{env, [{"CFLAGS", Cflags0 ++ " -DDEBUG"}]}],
                NewPortSpecs0 = [{Pattern0, Target0, Sources0, NewPortSpecOpts0}],
                lists:keyreplace(port_specs, 1, CONFIG0, {port_specs, NewPortSpecs0});
            _ -> CONFIG % env var not defined or anything other than true
          end,
case os:getenv("LSTATS") of
    "true" ->
        % % also get the current port spec opts
        [{Pattern1, Target1, Sources1, PortSpecOpts1}] =
            proplists:get_value(port_specs, CONFIG1),
        [{"CFLAGS", Cflags1}] = proplists:get_value(env, PortSpecOpts1),
        NewPortSpecOpts1 = [{env, [{"CFLAGS", Cflags1 ++ " -DLSTATS"}]}],
        NewPortSpecs1 = [{Pattern1, Target1, Sources1, NewPortSpecOpts1}],
        lists:keyreplace(port_specs, 1, CONFIG1, {port_specs, NewPortSpecs1});
    _ -> CONFIG1 % env var not defined or anything other than true
end.