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bahaghari/lib: add trivial.optionalNull

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Gabriel Arazas 2024-06-04 19:45:29 +08:00
parent 16df88b116
commit 3825c8568c
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2 changed files with 28 additions and 0 deletions
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18
subprojects/bahaghari/lib/trivial.nix
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@ -195,4 +195,22 @@ rec {
*/
scale = { inMin, inMax, outMin, outMax }: v:
((v - inMin) * (outMax - outMin)) / ((inMax - inMin) + outMin);
/* Returns a null value if the condition fails. Otherwise, returns the given
value `as`.
Type: optionalNull :: Bool -> Any -> Any
Example:
optionalNull true "HELLO"
=> "HELLO"
optionalNull (null != null) "HELLO"
=> null
*/
optionalNull = cond: as:
if cond then
as
else
null;
}

10
subprojects/bahaghari/tests/lib/trivial/default.nix
View File

@ -260,4 +260,14 @@ lib.runTests {
expr = self.trivial.isNumber true;
expected = false;
};
testOptionalNull = {
expr = self.trivial.optionalNull true "HELLO";
expected = "HELLO";
};
testOptionalNull2 = {
expr = self.trivial.optionalNull false "HELLO";
expected = null;
};
}