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nixpkgs/lib/asserts.nix
Profpatsch efdf618330 lib: move assertMsg and assertOneOf to their own library file
Since the `assertOneOf` uses `lib.generators`, they are not really trivial
anymore and should go into their own library file.
2018-09-06 18:14:27 +02:00

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1.2 KiB
Nix

{ lib }:
rec {
/* Print a trace message if pred is false.
Intended to be used to augment asserts with helpful error messages.
Example:
assertMsg false "nope"
=> false
stderr> trace: nope
assert (assertMsg ("foo" == "bar") "foo is not bar, silly"); ""
stderr> trace: foo is not bar, silly
stderr> assert failed at
Type:
assertMsg :: Bool -> String -> Bool
*/
# TODO(Profpatsch): add tests that check stderr
assertMsg = pred: msg:
if pred
then true
else builtins.trace msg false;
/* Specialized `assertMsg` for checking if val is one of the elements
of a list. Useful for checking enums.
Example:
let sslLibrary = "libressl"
in assertOneOf "sslLibrary" sslLibrary [ "openssl" "bearssl" ]
=> false
stderr> trace: sslLibrary must be one of "openssl", "bearssl", but is: "libressl"
Type:
assertOneOf :: String -> ComparableVal -> List ComparableVal -> Bool
*/
assertOneOf = name: val: xs: assertMsg
(lib.elem val xs)
"${name} must be one of ${
lib.generators.toPretty {} xs}, but is: ${
lib.generators.toPretty {} val}";
}