% vim: set ft=erlang:
begin
    TakeOutHank
        = fun (Config) ->
            {project_plugins, ProjPlugins} = lists:keyfind(project_plugins, 1, Config),
            {value, {rebar3_hank, HankVersion}, RemainingProjPlugins}
                = lists:keytake(rebar3_hank, 1, ProjPlugins),
            _UpdatedConfig = [{project_plugins, RemainingProjPlugins} | Config]
          end,

    DisableMaybeExprOnDep
        = fun (App, Config) ->
            ErlOpt = {feature, maybe_expr, disable},
            ErlOpts = {erl_opts, [ErlOpt]},
            Override = {override, App, ErlOpts},
            Overrides = [{overrides, [Override]}],
            [Overrides | Config]
          end,

    DisableMaybeExprIfNotEnabledOnEnv
        = fun (Config) ->
            Env = os:getenv(),
            Log = fun () -> rebar_api:debug("Disabling `maybe_expr` for `katana_code`"
                                            " as it may not be available", []) end,

            case [V || "ERL_FLAGS=" ++ V <- Env] of
                [Flags | _] ->
                    % katana-code (a dependent of rebar3_hank) requires maybe_expr
                    case string:find(Flags, "-enable-feature maybe_expr") of
                        nomatch ->
                            Log(),
                            DisableMaybeExprOnDep(katana_code, Config);
                        _ ->
                            Config
                    end;
                [] ->
                    Log(),
                    Config
            end
        end,


    OtpRelease = erlang:system_info(otp_release),
    try list_to_integer(OtpRelease) of
        22 ->
            % Take rebar3_hank away as it's no longer compatible with OTP 22
            TakeOutHank(CONFIG) ;
        25 ->
            DisableMaybeExprIfNotEnabledOnEnv(CONFIG);
        _ ->
            CONFIG
    catch
        error:badarg ->
            logger:warning("Don't now how to compare to OTP release: ~tp", [OtpRelease]),
            CONFIG
    end
end.