36 lines
1.3 KiB
Erlang
36 lines
1.3 KiB
Erlang
%%--------------------------------------------------------------------
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%% Copyright (c) 2012-2017 Feng Lee <feng@emqtt.io>.
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%%
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%% Licensed under the Apache License, Version 2.0 (the "License");
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%% you may not use this file except in compliance with the License.
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%% You may obtain a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing, software
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%% distributed under the License is distributed on an "AS IS" BASIS,
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%% See the License for the specific language governing permissions and
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%% limitations under the License.
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%%--------------------------------------------------------------------
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-module(emqttd_opts).
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-export([merge/2]).
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%% @doc Merge Options
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merge(Defaults, Options) ->
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lists:foldl(
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fun({Opt, Val}, Acc) ->
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case lists:keymember(Opt, 1, Acc) of
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true -> lists:keyreplace(Opt, 1, Acc, {Opt, Val});
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false -> [{Opt, Val}|Acc]
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end;
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(Opt, Acc) ->
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case lists:member(Opt, Acc) of
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true -> Acc;
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false -> [Opt | Acc]
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end
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end, Defaults, Options).
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