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add getAttrOr & getAttrDefault

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Emile Clark-Boman 2026-01-27 08:52:32 +10:00
parent 9641f59f3d
commit ce75ed03b8
1 changed files with 7 additions and 0 deletions
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7
nt/primitives/bootstrap/std/attrs.nix
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@ -34,6 +34,13 @@ in rec {
enfHasAttr = name: xs: msg: enfHasAttr = name: xs: msg:
enfIsAttrs xs msg && enfHasAttrUnsafe name xs msg; enfIsAttrs xs msg && enfHasAttrUnsafe name xs msg;
getAttrOr = name: f: xs:
if xs ? ${name}
then xs.${name}
else f xs;
getAttrDefault = name: default: getAttrOr name (_: default);
mergeAttrsList = list: let mergeAttrsList = list: let
# `binaryMerge start end` merges the elements at indices `index` of `list` such that `start <= index < end` # `binaryMerge start end` merges the elements at indices `index` of `list` such that `start <= index < end`
# Type: Int -> Int -> Attrs # Type: Int -> Int -> Attrs