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author | Nicolas Pierron <nicolas.b.pierron@gmail.com> | 2009-11-05 15:39:45 +0000 |
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committer | Nicolas Pierron <nicolas.b.pierron@gmail.com> | 2009-11-05 15:39:45 +0000 |
commit | d8bbae877a6049867625ac86134422f8765b2157 (patch) | |
tree | ffab2a80adcc89307ea52afea87aeb8c523549c3 /pkgs/lib | |
parent | 5684506470f7fbf76c308fd58f92b9a4211aa175 (diff) | |
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* Add a type for read-only options. Options which are only declared
are used when a module produces read-only data for other modules. svn path=/nixpkgs/trunk/; revision=18148
Diffstat (limited to 'pkgs/lib')
-rw-r--r-- | pkgs/lib/types.nix | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/pkgs/lib/types.nix b/pkgs/lib/types.nix index 8b0f61549b5..01a5d98fca6 100644 --- a/pkgs/lib/types.nix +++ b/pkgs/lib/types.nix @@ -110,6 +110,12 @@ rec { throw "Multiple definitions. Only one is allowed for this option."; }; + none = elemType: mkOptionType { + inherit (elemType) name check iter fold docPath hasOptions; + merge = list: + throw "No definitions are allowed for this option."; + }; + nullOr = elemType: mkOptionType { inherit (elemType) name merge docPath hasOptions; check = x: builtins.isNull x || elemType.check x; |