%% -*- mode: erlang;erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 ft=erlang et
%%


%% We will add the location of the OTP patched modules based on the
%% OTP version
OTPVersion = erlang:system_info(otp_release),

%% The existing configuration from rebar3. CONFIG is a special variable
%% injected by rebar3
SrcDirs0 =
    case lists:keyfind(src_dirs, 1, CONFIG) of
        {src_dirs, Val} ->
            Val;
        false ->
            ["src"]
    end,

FindDir = fun
    FindDir(V) when V >= "24" ->
        OTPDir = filename:join(["priv", "otp", OTPVersion]),
        case filelib:is_dir(OTPDir) of
            true ->
                SrcDirs = SrcDirs0 ++ [OTPDir],
                lists:keystore(src_dirs, 1, CONFIG, {src_dirs, SrcDirs});
            false ->
                %% We try with a version below
                FindDir(integer_to_list(list_to_integer(OTPVersion) - 1))
        end;
    FindDir(V) ->
        exit("OTP version " ++ V ++ " not supported by partisan")
end,

FindDir(OTPVersion).