diff options
Diffstat (limited to 'pkgs/lib/options.nix')
| -rw-r--r-- | pkgs/lib/options.nix | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/pkgs/lib/options.nix b/pkgs/lib/options.nix index cd60b8f3b88c..59bda41a623f 100644 --- a/pkgs/lib/options.nix +++ b/pkgs/lib/options.nix @@ -2,7 +2,7 @@ let lib = import ./default.nix; in -with { inherit (builtins) head tail; }; +with { inherit (builtins) head length; }; with import ./trivial.nix; with import ./lists.nix; with import ./misc.nix; @@ -133,7 +133,7 @@ rec { # separate the merge & apply fields from the interface. mergeOptionDecls = opts: if opts == [] then {} - else if tail opts == [] then + else if length opts == 1 then let opt = head opts; in if opt ? options then opt // { options = toList opt.options; } @@ -152,13 +152,11 @@ rec { opt1 // opt2 // optionalAttrs (opt1 ? options || opt2 ? options) { options = - (toList (attrByPath ["options"] [] opt1)) - ++ (toList (attrByPath ["options"] [] opt2)); + (toList (opt1.options or [])) + ++ (toList (opt2.options or [])); } // optionalAttrs (opt1 ? extraConfigs || opt2 ? extraConfigs) { - extraConfigs = - (attrByPath ["extraConfigs"] [] opt1) - ++ (attrByPath ["extraConfigs"] [] opt2); + extraConfigs = opt1.extraConfigs or [] ++ opt2.extraConfigs or []; } )) {} opts; @@ -189,7 +187,7 @@ rec { ) (attrNames defs)); mergeDefaultOption = list: - if list != [] && tail list == [] then head list + if length list == 1 then head list else if all builtins.isFunction list then x: mergeDefaultOption (map (f: f x) list) else if all isList list then concatLists list else if all isAttrs list then fold lib.mergeAttrs {} list @@ -214,7 +212,7 @@ rec { mergeOneOption = list: if list == [] then abort "This case should never happen." - else if tail list != [] then throw "Multiple definitions. Only one is allowed for this option." + else if length list != 1 then throw "Multiple definitions. Only one is allowed for this option." else head list; |