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{ lib }:
with lib;
{
selectorFunction = mkOptionType {
name = "selectorFunction";
description =
"Function that takes an attribute set and returns a list"
+ " containing a selection of the values of the input set";
check = isFunction;
merge = _loc: defs:
as: concatMap (select: select as) (getValues defs);
};
overlayFunction = mkOptionType {
name = "overlayFunction";
description =
"An overlay function, takes self and super and returns"
+ " an attribute set overriding the desired attributes.";
check = isFunction;
merge = _loc: defs:
self: super:
foldl' (res: def: mergeAttrs res (def.value self super)) {} defs;
};
}
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