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lib.lists.mutuallyExclusive: add function

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This commit is contained in:
Vladimír Čunát 2017-07-02 09:32:43 +02:00 committed by John Ericson
parent 5afcdc88fa
commit dfc004e69c
2 changed files with 9 additions and 6 deletions
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8
lib/lists.nix
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@ -477,4 +477,12 @@ rec {
*/
subtractLists = e: filter (x: !(elem x e));
/* Test if two lists have no common element.
It should be slightly more efficient than (intersectLists a b == [])
*/
mutuallyExclusive = a: b:
(builtins.length a) == 0 ||
(!(builtins.elem (builtins.head a) b) &&
mutuallyExclusive (builtins.tail a) b);
}

7
pkgs/stdenv/generic/default.nix
View file

@ -45,13 +45,8 @@ let
throw ''‘${showLicense license}’ is not an attribute of lib.licenses''
) list;
mutuallyExclusive = a: b:
(builtins.length a) == 0 ||
(!(builtins.elem (builtins.head a) b) &&
mutuallyExclusive (builtins.tail a) b);
areLicenseListsValid =
if mutuallyExclusive whitelist blacklist then
if lib.mutuallyExclusive whitelist blacklist then
assert onlyLicenses whitelist; assert onlyLicenses blacklist; true
else
throw "whitelistedLicenses and blacklistedLicenses are not mutually exclusive.";