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lib.types.attrTag: init

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This commit is contained in:
Robert Hensing 2024-01-28 00:30:36 +01:00
parent 80afdbf97f
commit ca81a89839
4 changed files with 122 additions and 0 deletions
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37
lib/types.nix
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@ -614,6 +614,43 @@ rec {
nestedTypes.elemType = elemType;
};
attrTag = tags: attrTagWith { inherit tags; };
attrTagWith = { tags }:
let
choicesStr = concatMapStringsSep ", " lib.strings.escapeNixIdentifier (attrNames tags);
in
mkOptionType {
name = "attrTag";
description = "attribute-tagged union of ${choicesStr}";
getSubModules = null;
substSubModules = m: attrTagWith { tags = mapAttrs (n: v: v.substSubModules m) tags; };
check = v: isAttrs v && length (attrNames v) == 1 && tags?${head (attrNames v)};
merge = loc: defs:
let
choice = head (attrNames (head defs).value);
checkedValueDefs = map
(def:
assert (length (attrNames def.value)) == 1;
if (head (attrNames def.value)) != choice
then throw "The option `${showOption loc}` is defined both as `${choice}` and `${head (attrNames def.value)}`, in ${showFiles (getFiles defs)}."
else { inherit (def) file; value = def.value.${choice}; })
defs;
in
if tags?${choice}
then
{ ${choice} =
(mergeDefinitions
(loc ++ [choice])
tags.${choice}
checkedValueDefs
).mergedValue;
}
else throw "The option `${showOption loc}` is defined as ${lib.strings.escapeNixIdentifier choice}, but ${lib.strings.escapeNixIdentifier choice} is not among the valid choices (${choicesStr}). Value ${choice} was defined in ${showFiles (getFiles defs)}.";
nestedTypes = tags;
functor = (defaultFunctor "attrTagWith") // { payload = { inherit tags; }; binOp = a: b: { tags = a.tags // b.tags; }; };
};
uniq = unique { message = ""; };
unique = { message }: type: mkOptionType rec {