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* Add a type for read-only options. Options which are only declared
are used when a module produces read-only data for other modules. svn path=/nixpkgs/trunk/; revision=18148
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@ -110,6 +110,12 @@ rec {
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throw "Multiple definitions. Only one is allowed for this option.";
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throw "Multiple definitions. Only one is allowed for this option.";
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};
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};
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none = elemType: mkOptionType {
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inherit (elemType) name check iter fold docPath hasOptions;
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merge = list:
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throw "No definitions are allowed for this option.";
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};
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nullOr = elemType: mkOptionType {
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nullOr = elemType: mkOptionType {
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inherit (elemType) name merge docPath hasOptions;
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inherit (elemType) name merge docPath hasOptions;
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check = x: builtins.isNull x || elemType.check x;
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check = x: builtins.isNull x || elemType.check x;
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