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lib.checkListOfEnum: init

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This commit is contained in:
José Romildo 2022-01-09 19:12:27 -03:00
parent 2ac65dd85b
commit 4fc67da841
2 changed files with 18 additions and 1 deletions
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2
lib/default.nix
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@ -66,7 +66,7 @@ let
stringLength sub substring tail trace;
inherit (self.trivial) id const pipe concat or and bitAnd bitOr bitXor
bitNot boolToString mergeAttrs flip mapNullable inNixShell isFloat min max
importJSON importTOML warn warnIf throwIfNot
importJSON importTOML warn warnIf throwIfNot checkListOfEnum
info showWarnings nixpkgsVersion version
mod compare splitByAndCompare functionArgs setFunctionArgs isFunction
toHexString toBaseDigits;

17
lib/trivial.nix
View File

@ -347,6 +347,23 @@ rec {
*/
throwIfNot = cond: msg: if cond then x: x else throw msg;
/* Check if the elements in a list are valid values from a enum, returning the identity function, or throwing an error message otherwise.
Example:
let colorVariants = ["bright" "dark" "black"]
in checkListOfEnum "color variants" [ "standard" "light" "dark" ] colorVariants;
=>
error: color variants: bright, black unexpected; valid ones: standard, light, dark
Type: String -> List ComparableVal -> List ComparableVal -> a -> a
*/
checkListOfEnum = msg: valid: given:
let
unexpected = lib.subtractLists valid given;
in
lib.throwIfNot (unexpected == [])
"${msg}: ${builtins.concatStringsSep ", " (builtins.map builtins.toString unexpected)} unexpected; valid ones: ${builtins.concatStringsSep ", " (builtins.map builtins.toString valid)}";
info = msg: builtins.trace "INFO: ${msg}";
showWarnings = warnings: res: lib.foldr (w: x: warn w x) res warnings;