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Preserve order of grouped duplicates

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This commit is contained in:
Evgeny Khramtsov 2019-11-08 10:20:18 +03:00
parent f6d7af1a2b
commit 925998c360
1 changed files with 12 additions and 7 deletions
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19
src/econf.erl
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@ -232,13 +232,18 @@ format_join(L) ->
%% into a single option with all list-values being concatenated
-spec group_dups(list(T)) -> list(T).
group_dups(Y1) ->
{Y2, D} = lists:mapfoldl(
fun({Option, Values}, Acc) when is_list(Values) ->
{[], dict:append_list(Option, Values, Acc)};
(Other, Acc) ->
{[Other], Acc}
end, dict:new(), Y1),
lists:append(Y2) ++ dict:to_list(D).
lists:reverse(
lists:foldl(
fun({Option, Values}, Acc) when is_list(Values) ->
case lists:keyfind(Option, 1, Acc) of
{Option, Vals} when is_list(Vals) ->
lists:keyreplace(Option, 1, Acc, {Option, Vals ++ Values});
_ ->
[{Option, Values}|Acc]
end;
(Other, Acc) ->
[Other|Acc]
end, [], Y1)).
%%%===================================================================
%%% Validators from yconf