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[Backport release-24.11] lib: add defaultTo #367441

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Dec 22, 2024
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2 changes: 1 addition & 1 deletion lib/default.nix
Original file line number Diff line number Diff line change
Expand Up @@ -71,7 +71,7 @@ let
# these are the only ones that are currently not
inherit (builtins) addErrorContext isPath trace typeOf unsafeGetAttrPos;
inherit (self.trivial) id const pipe concat or and xor bitAnd bitOr bitXor
bitNot boolToString mergeAttrs flip mapNullable inNixShell isFloat min max
bitNot boolToString mergeAttrs flip defaultTo mapNullable inNixShell isFloat min max
importJSON importTOML warn warnIf warnIfNot throwIf throwIfNot checkListOfEnum
info showWarnings nixpkgsVersion version isInOldestRelease oldestSupportedReleaseIsAtLeast
mod compare splitByAndCompare seq deepSeq lessThan add sub
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34 changes: 34 additions & 0 deletions lib/trivial.nix
Original file line number Diff line number Diff line change
Expand Up @@ -316,6 +316,40 @@ in {
*/
flip = f: a: b: f b a;

/**
Return `maybeValue` if not null, otherwise return `default`.


# Inputs

`default`

: 1\. Function argument

`maybeValue`

: 2\. Function argument


# Examples
:::{.example}
## `lib.trivial.defaultTo` usage example

```nix
defaultTo "default" null
=> "default"
defaultTo "default" "foo"
=> "foo"
defaultTo "default" false
=> false
```

:::
*/
defaultTo = default: maybeValue:
if maybeValue != null then maybeValue
else default;

/**
Apply function if the supplied argument is non-null.

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