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either type: improve merge function

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Eric Sagnes 2016-11-07 08:34:06 +09:00 committed by Bjørn Forsman
parent 0ba3d429a7
commit cf2654b2e0
1 changed files with 9 additions and 1 deletions
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10
lib/types.nix
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@ -333,7 +333,15 @@ rec {
name = "either";
description = "${t1.description} or ${t2.description}";
check = x: t1.check x || t2.check x;
merge = mergeOneOption;
merge = loc: defs:
let
defList = map (d: d.value) defs;
in
if all (x: t1.check x) defList
then t1.merge loc defs
else if all (x: t2.check x) defList
then t2.merge loc defs
else mergeOneOption loc defs;
typeMerge = f':
let mt1 = t1.typeMerge (elemAt f'.wrapped 0).functor;
mt2 = t2.typeMerge (elemAt f'.wrapped 1).functor;