rebar.config.script

%%-*- mode: erlang -*-

AddPortEnv = fun(Config, Flags, NewValue) ->
    {port_env, Vals} = lists:keyfind(port_env, 1, Config),
    Fold = fun({Flag, Val}, Acc) ->
        case lists:member(Flag, Flags) of
            true ->
                [{Flag, Val ++ NewValue} | Acc];
            false ->
                Acc
        end
    end,
    NewVals = lists:foldl(Fold, [], Vals),
    lists:keyreplace(port_env, 1, Config, {port_env, NewVals})
end.

%% Set the minimum Mac target to 10.8 for 10.9 or greater.  This runtime
%% check is needed since rebar's system_architecture check looks only at
%% the version of the OS used to build the Erlang runtime, not the version
%% actually running.
case os:type() of
    {unix, darwin} ->
        NewerOsxOpts = " -mmacosx-version-min=10.8 -stdlib=libc++",
        BrewLibsOpts =
            case os:find_executable("brew") of
                false ->
                    "";
                _Brew ->
                    HomebrewPrefix = string:trim(os:cmd("brew --prefix")),
                    " -L" ++ HomebrewPrefix ++ "/lib"
            end,
        [Mjr | _] = string:tokens(os:cmd("/usr/bin/uname -r"), "."),
        Major = list_to_integer(Mjr),
        Flags = ["CFLAGS", "CXXFLAGS", "LDFLAGS"],
        if
            Major >= 13 ->
                AddPortEnv(CONFIG, Flags, NewerOsxOpts ++ BrewLibsOpts);
            true ->
                AddPortEnv(CONFIG, Flags, BrewLibsOpts)
        end;
    _ ->
        CONFIG
end.