lib/trivial: add warnIfNot and throwIf
Negated versions of warnIf and throwIfNot.
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@ -323,7 +323,14 @@ rec {
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Type: bool -> string -> a -> a
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*/
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warnIf = cond: msg: if cond then warn msg else id;
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warnIf = cond: msg: if cond then warn msg else x: x;
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/*
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Like warnIf, but negated (warn if the first argument is `false`).
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Type: bool -> string -> a -> a
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*/
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warnIfNot = cond: msg: if cond then x: x else warn msg;
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/*
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Like the `assert b; e` expression, but with a custom error message and
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@ -347,6 +354,13 @@ rec {
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*/
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throwIfNot = cond: msg: if cond then x: x else throw msg;
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/*
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Like throwIfNot, but negated (throw if the first argument is `true`).
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Type: bool -> string -> a -> a
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*/
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throwIf = cond: msg: if cond then throw msg else x: x;
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/* Check if the elements in a list are valid values from a enum, returning the identity function, or throwing an error message otherwise.
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Example:
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